writefile.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/*
FILEFORMAT: IFF-style structure  (but not IFF compatible!)

start file:
    BLENDER_V100    12 bytes  (versie 1.00)
                    V = big endian, v = little endian
                    _ = 4 byte pointer, - = 8 byte pointer

datablocks:     also see struct BHead
    <bh.code>           4 chars
    <bh.len>            int,  len data after BHead
    <bh.old>            void,  old pointer
    <bh.SDNAnr>         int
    <bh.nr>             int, in case of array: amount of structs
    data
    ...
    ...

Almost all data in Blender are structures. Each struct saved
gets a BHead header.  With BHead the struct can be linked again
and compared with StructDNA .

WRITE

Preferred writing order: (not really a must, but why would you do it random?)
Any case: direct data is ALWAYS after the lib block

(Local file data)
- for each LibBlock
    - write LibBlock
    - write associated direct data
(External file data)
- per library
    - write library block
    - per LibBlock
        - write the ID of LibBlock
- write TEST (128x128, blend file preview, optional)
- write FileGlobal (some global vars)
- write SDNA
- write USER if filename is ~/X.XX/config/startup.blend
*/


#include <math.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "zlib.h"

#ifndef WIN32
#include <unistd.h>
#else
#include "winsock2.h"
#include <io.h>
#include <process.h> // for getpid
#include "BLI_winstuff.h"
#endif

#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_actuator_types.h"
#include "DNA_brush_types.h"
#include "DNA_camera_types.h"
#include "DNA_cloth_types.h"
#include "DNA_constraint_types.h"
#include "DNA_controller_types.h"
#include "DNA_dynamicpaint_types.h"
#include "DNA_genfile.h"
#include "DNA_group_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_fileglobal_types.h"
#include "DNA_key_types.h"
#include "DNA_lattice_types.h"
#include "DNA_lamp_types.h"
#include "DNA_meta_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_material_types.h"
#include "DNA_node_types.h"
#include "DNA_object_types.h"
#include "DNA_object_force.h"
#include "DNA_packedFile_types.h"
#include "DNA_particle_types.h"
#include "DNA_property_types.h"
#include "DNA_scene_types.h"
#include "DNA_sdna_types.h"
#include "DNA_sequence_types.h"
#include "DNA_sensor_types.h"
#include "DNA_smoke_types.h"
#include "DNA_space_types.h"
#include "DNA_screen_types.h"
#include "DNA_speaker_types.h"
#include "DNA_sound_types.h"
#include "DNA_text_types.h"
#include "DNA_view3d_types.h"
#include "DNA_vfont_types.h"
#include "DNA_world_types.h"
#include "DNA_windowmanager_types.h"
#include "DNA_movieclip_types.h"

#include "MEM_guardedalloc.h" // MEM_freeN
#include "BLI_blenlib.h"
#include "BLI_linklist.h"
#include "BLI_bpath.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "BKE_action.h"
#include "BKE_blender.h"
#include "BKE_curve.h"
#include "BKE_constraint.h"
#include "BKE_global.h" // for G
#include "BKE_library.h" // for  set_listbasepointers
#include "BKE_main.h"
#include "BKE_node.h"
#include "BKE_report.h"
#include "BKE_sequencer.h"
#include "BKE_utildefines.h"
#include "BKE_modifier.h"
#include "BKE_fcurve.h"
#include "BKE_pointcache.h"

#include "BLO_writefile.h"
#include "BLO_readfile.h"
#include "BLO_undofile.h"

#include "readfile.h"

#include <errno.h>

/* ********* my write, buffered writing with minimum size chunks ************ */

#define MYWRITE_BUFFER_SIZE 100000
#define MYWRITE_MAX_CHUNK   32768

typedef struct {
    struct SDNA *sdna;

    int file;
    unsigned char *buf;
    MemFile *compare, *current;
    
    int tot, count, error, memsize;

#ifdef USE_BMESH_SAVE_AS_COMPAT
    char use_mesh_compat; /* option to save with older mesh format */
#endif
} WriteData;

static WriteData *writedata_new(int file)
{
    WriteData *wd= MEM_callocN(sizeof(*wd), "writedata");

        /* XXX, see note about this in readfile.c, remove
         * once we have an xp lock - zr
         */

    if (wd == NULL) return NULL;

    wd->sdna= DNA_sdna_from_data(DNAstr, DNAlen, 0);

    wd->file= file;

    wd->buf= MEM_mallocN(MYWRITE_BUFFER_SIZE, "wd->buf");

    return wd;
}

static void writedata_do_write(WriteData *wd, void *mem, int memlen)
{
    if ((wd == NULL) || wd->error || (mem == NULL) || memlen < 1) return;
    if (wd->error) return;

    /* memory based save */
    if(wd->current) {
        add_memfilechunk(NULL, wd->current, mem, memlen);
    }
    else {
        if (write(wd->file, mem, memlen) != memlen)
            wd->error= 1;
        
    }
}

static void writedata_free(WriteData *wd)
{
    DNA_sdna_free(wd->sdna);

    MEM_freeN(wd->buf);
    MEM_freeN(wd);
}

/***/

#define MYWRITE_FLUSH       NULL

static void mywrite( WriteData *wd, void *adr, int len)
{
    if (wd->error) return;

    /* flush helps compression for undo-save */
    if(adr==MYWRITE_FLUSH) {
        if(wd->count) {
            writedata_do_write(wd, wd->buf, wd->count);
            wd->count= 0;
        }
        return;
    }

    wd->tot+= len;
    
    /* if we have a single big chunk, write existing data in
     * buffer and write out big chunk in smaller pieces */
    if(len>MYWRITE_MAX_CHUNK) {
        if(wd->count) {
            writedata_do_write(wd, wd->buf, wd->count);
            wd->count= 0;
        }

        do {
            int writelen= MIN2(len, MYWRITE_MAX_CHUNK);
            writedata_do_write(wd, adr, writelen);
            adr = (char*)adr + writelen;
            len -= writelen;
        } while(len > 0);

        return;
    }

    /* if data would overflow buffer, write out the buffer */
    if(len+wd->count>MYWRITE_BUFFER_SIZE-1) {
        writedata_do_write(wd, wd->buf, wd->count);
        wd->count= 0;
    }

    /* append data at end of buffer */
    memcpy(&wd->buf[wd->count], adr, len);
    wd->count+= len;
}

static WriteData *bgnwrite(int file, MemFile *compare, MemFile *current)
{
    WriteData *wd= writedata_new(file);

    if (wd == NULL) return NULL;

    wd->compare= compare;
    wd->current= current;
    /* this inits comparing */
    add_memfilechunk(compare, NULL, NULL, 0);
    
    return wd;
}

static int endwrite(WriteData *wd)
{
    int err;

    if (wd->count) {
        writedata_do_write(wd, wd->buf, wd->count);
        wd->count= 0;
    }
    
    err= wd->error;
    writedata_free(wd);

    return err;
}

/* ********** WRITE FILE ****************** */

static void writestruct(WriteData *wd, int filecode, const char *structname, int nr, void *adr)
{
    BHead bh;
    short *sp;

    if(adr==NULL || nr==0) return;

    /* init BHead */
    bh.code= filecode;
    bh.old= adr;
    bh.nr= nr;

    bh.SDNAnr= DNA_struct_find_nr(wd->sdna, structname);
    if(bh.SDNAnr== -1) {
        printf("error: can't find SDNA code <%s>\n", structname);
        return;
    }
    sp= wd->sdna->structs[bh.SDNAnr];

    bh.len= nr*wd->sdna->typelens[sp[0]];

    if(bh.len==0) return;

    mywrite(wd, &bh, sizeof(BHead));
    mywrite(wd, adr, bh.len);
}

static void writedata(WriteData *wd, int filecode, int len, void *adr)  /* do not use for structs */
{
    BHead bh;

    if(adr==NULL) return;
    if(len==0) return;

    len+= 3;
    len-= ( len % 4);

    /* init BHead */
    bh.code= filecode;
    bh.old= adr;
    bh.nr= 1;
    bh.SDNAnr= 0;
    bh.len= len;

    mywrite(wd, &bh, sizeof(BHead));
    if(len) mywrite(wd, adr, len);
}

/* *************** writing some direct data structs used in more code parts **************** */
/*These functions are used by blender's .blend system for file saving/loading.*/
void IDP_WriteProperty_OnlyData(IDProperty *prop, void *wd);
void IDP_WriteProperty(IDProperty *prop, void *wd);

static void IDP_WriteArray(IDProperty *prop, void *wd)
{
    /*REMEMBER to set totalen to len in the linking code!!*/
    if (prop->data.pointer) {
        writedata(wd, DATA, MEM_allocN_len(prop->data.pointer), prop->data.pointer);

        if(prop->subtype == IDP_GROUP) {
            IDProperty **array= prop->data.pointer;
            int a;

            for(a=0; a<prop->len; a++)
                IDP_WriteProperty(array[a], wd);
        }
    }
}

static void IDP_WriteIDPArray(IDProperty *prop, void *wd)
{
    /*REMEMBER to set totalen to len in the linking code!!*/
    if (prop->data.pointer) {
        IDProperty *array = prop->data.pointer;
        int a;

        writestruct(wd, DATA, "IDProperty", prop->len, array);

        for(a=0; a<prop->len; a++)
            IDP_WriteProperty_OnlyData(&array[a], wd);
    }
}

static void IDP_WriteString(IDProperty *prop, void *wd)
{
    /*REMEMBER to set totalen to len in the linking code!!*/
    writedata(wd, DATA, prop->len+1, prop->data.pointer);
}

static void IDP_WriteGroup(IDProperty *prop, void *wd)
{
    IDProperty *loop;

    for (loop=prop->data.group.first; loop; loop=loop->next) {
        IDP_WriteProperty(loop, wd);
    }
}

/* Functions to read/write ID Properties */
void IDP_WriteProperty_OnlyData(IDProperty *prop, void *wd)
{
    switch (prop->type) {
        case IDP_GROUP:
            IDP_WriteGroup(prop, wd);
            break;
        case IDP_STRING:
            IDP_WriteString(prop, wd);
            break;
        case IDP_ARRAY:
            IDP_WriteArray(prop, wd);
            break;
        case IDP_IDPARRAY:
            IDP_WriteIDPArray(prop, wd);
            break;
    }
}

void IDP_WriteProperty(IDProperty *prop, void *wd)
{
    writestruct(wd, DATA, "IDProperty", 1, prop);
    IDP_WriteProperty_OnlyData(prop, wd);
}

static void write_fmodifiers(WriteData *wd, ListBase *fmodifiers)
{
    FModifier *fcm;
    
    /* Modifiers */
    for (fcm= fmodifiers->first; fcm; fcm= fcm->next) {
        FModifierTypeInfo *fmi= fmodifier_get_typeinfo(fcm);
        
        /* Write the specific data */
        if (fmi && fcm->data) {
            /* firstly, just write the plain fmi->data struct */
            writestruct(wd, DATA, fmi->structName, 1, fcm->data);
            
            /* do any modifier specific stuff */
            switch (fcm->type) {
                case FMODIFIER_TYPE_GENERATOR:
                {
                    FMod_Generator *data= (FMod_Generator *)fcm->data;
                    
                    /* write coefficients array */
                    if (data->coefficients)
                        writedata(wd, DATA, sizeof(float)*(data->arraysize), data->coefficients);
                }
                    break;
                case FMODIFIER_TYPE_ENVELOPE:
                {
                    FMod_Envelope *data= (FMod_Envelope *)fcm->data;
                    
                    /* write envelope data */
                    if (data->data)
                        writestruct(wd, DATA, "FCM_EnvelopeData", data->totvert, data->data);
                }
                    break;
                case FMODIFIER_TYPE_PYTHON:
                {
                    FMod_Python *data = (FMod_Python *)fcm->data;
                    
                    /* Write ID Properties -- and copy this comment EXACTLY for easy finding
                     of library blocks that implement this.*/
                    IDP_WriteProperty(data->prop, wd);
                }
                    break;
            }
        }
        
        /* Write the modifier */
        writestruct(wd, DATA, "FModifier", 1, fcm);
    }
}

static void write_fcurves(WriteData *wd, ListBase *fcurves)
{
    FCurve *fcu;
    
    for (fcu=fcurves->first; fcu; fcu=fcu->next) {
        /* F-Curve */
        writestruct(wd, DATA, "FCurve", 1, fcu);
        
        /* curve data */
        if (fcu->bezt)      
            writestruct(wd, DATA, "BezTriple", fcu->totvert, fcu->bezt);
        if (fcu->fpt)
            writestruct(wd, DATA, "FPoint", fcu->totvert, fcu->fpt);
            
        if (fcu->rna_path)
            writedata(wd, DATA, strlen(fcu->rna_path)+1, fcu->rna_path);
        
        /* driver data */
        if (fcu->driver) {
            ChannelDriver *driver= fcu->driver;
            DriverVar *dvar;
            
            writestruct(wd, DATA, "ChannelDriver", 1, driver);
            
            /* variables */
            for (dvar= driver->variables.first; dvar; dvar= dvar->next) {
                writestruct(wd, DATA, "DriverVar", 1, dvar);
                
                DRIVER_TARGETS_USED_LOOPER(dvar)
                {
                    if (dtar->rna_path)
                        writedata(wd, DATA, strlen(dtar->rna_path)+1, dtar->rna_path);
                }
                DRIVER_TARGETS_LOOPER_END
            }
        }
        
        /* write F-Modifiers */
        write_fmodifiers(wd, &fcu->modifiers);
    }
}

static void write_actions(WriteData *wd, ListBase *idbase)
{
    bAction *act;
    bActionGroup *grp;
    TimeMarker *marker;
    
    for(act=idbase->first; act; act= act->id.next) {
        if (act->id.us>0 || wd->current) {
            writestruct(wd, ID_AC, "bAction", 1, act);
            if (act->id.properties) IDP_WriteProperty(act->id.properties, wd);
            
            write_fcurves(wd, &act->curves);
            
            for (grp=act->groups.first; grp; grp=grp->next) {
                writestruct(wd, DATA, "bActionGroup", 1, grp);
            }
            
            for (marker=act->markers.first; marker; marker=marker->next) {
                writestruct(wd, DATA, "TimeMarker", 1, marker);
            }
        }
    }
    
    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_keyingsets(WriteData *wd, ListBase *list)
{
    KeyingSet *ks;
    KS_Path *ksp;
    
    for (ks= list->first; ks; ks= ks->next) {
        /* KeyingSet */
        writestruct(wd, DATA, "KeyingSet", 1, ks);
        
        /* Paths */
        for (ksp= ks->paths.first; ksp; ksp= ksp->next) {
            /* Path */
            writestruct(wd, DATA, "KS_Path", 1, ksp);
            
            if (ksp->rna_path)
                writedata(wd, DATA, strlen(ksp->rna_path)+1, ksp->rna_path);
        }
    }
}

static void write_nlastrips(WriteData *wd, ListBase *strips)
{
    NlaStrip *strip;
    
    for (strip= strips->first; strip; strip= strip->next) {
        /* write the strip first */
        writestruct(wd, DATA, "NlaStrip", 1, strip);
        
        /* write the strip's F-Curves and modifiers */
        write_fcurves(wd, &strip->fcurves);
        write_fmodifiers(wd, &strip->modifiers);
        
        /* write the strip's children */
        write_nlastrips(wd, &strip->strips);
    }
}

static void write_nladata(WriteData *wd, ListBase *nlabase)
{
    NlaTrack *nlt;
    
    /* write all the tracks */
    for (nlt= nlabase->first; nlt; nlt= nlt->next) {
        /* write the track first */
        writestruct(wd, DATA, "NlaTrack", 1, nlt);
        
        /* write the track's strips */
        write_nlastrips(wd, &nlt->strips);
    }
}

static void write_animdata(WriteData *wd, AnimData *adt)
{
    AnimOverride *aor;
    
    /* firstly, just write the AnimData block */
    writestruct(wd, DATA, "AnimData", 1, adt);
    
    /* write drivers */
    write_fcurves(wd, &adt->drivers);
    
    /* write overrides */
    // FIXME: are these needed?
    for (aor= adt->overrides.first; aor; aor= aor->next) {
        /* overrides consist of base data + rna_path */
        writestruct(wd, DATA, "AnimOverride", 1, aor);
        writedata(wd, DATA, strlen(aor->rna_path)+1, aor->rna_path);
    }
    
    // TODO write the remaps (if they are needed)
    
    /* write NLA data */
    write_nladata(wd, &adt->nla_tracks);
}

static void write_curvemapping(WriteData *wd, CurveMapping *cumap)
{
    int a;
    
    writestruct(wd, DATA, "CurveMapping", 1, cumap);
    for(a=0; a<CM_TOT; a++)
        writestruct(wd, DATA, "CurveMapPoint", cumap->cm[a].totpoint, cumap->cm[a].curve);
}

static void write_node_socket(WriteData *wd, bNodeSocket *sock)
{
    bNodeSocketType *stype= ntreeGetSocketType(sock->type);

    /* forward compatibility code, so older blenders still open */
    sock->stack_type = 1;

    if(sock->default_value) {
        bNodeSocketValueFloat *valfloat;
        bNodeSocketValueVector *valvector;
        bNodeSocketValueRGBA *valrgba;
        
        switch (sock->type) {
        case SOCK_FLOAT:
            valfloat = sock->default_value;
            sock->ns.vec[0] = valfloat->value;
            sock->ns.min = valfloat->min;
            sock->ns.max = valfloat->max;
            break;
        case SOCK_VECTOR:
            valvector = sock->default_value;
            copy_v3_v3(sock->ns.vec, valvector->value);
            sock->ns.min = valvector->min;
            sock->ns.max = valvector->max;
            break;
        case SOCK_RGBA:
            valrgba = sock->default_value;
            copy_v4_v4(sock->ns.vec, valrgba->value);
            sock->ns.min = 0.0f;
            sock->ns.max = 1.0f;
            break;
        }
    }

    /* actual socket writing */
    writestruct(wd, DATA, "bNodeSocket", 1, sock);
    if (sock->default_value)
        writestruct(wd, DATA, stype->value_structname, 1, sock->default_value);
}

/* this is only direct data, tree itself should have been written */
static void write_nodetree(WriteData *wd, bNodeTree *ntree)
{
    bNode *node;
    bNodeSocket *sock;
    bNodeLink *link;
    
    /* for link_list() speed, we write per list */
    
    if(ntree->adt) write_animdata(wd, ntree->adt);
    
    for(node= ntree->nodes.first; node; node= node->next)
        writestruct(wd, DATA, "bNode", 1, node);

    for(node= ntree->nodes.first; node; node= node->next) {
        for(sock= node->inputs.first; sock; sock= sock->next)
            write_node_socket(wd, sock);
        for(sock= node->outputs.first; sock; sock= sock->next)
            write_node_socket(wd, sock);

        
        if(node->storage && node->type!=NODE_DYNAMIC) {
            /* could be handlerized at some point, now only 1 exception still */
            if(ntree->type==NTREE_SHADER && (node->type==SH_NODE_CURVE_VEC || node->type==SH_NODE_CURVE_RGB))
                write_curvemapping(wd, node->storage);
            else if(ntree->type==NTREE_COMPOSIT && ELEM4(node->type, CMP_NODE_TIME, CMP_NODE_CURVE_VEC, CMP_NODE_CURVE_RGB, CMP_NODE_HUECORRECT))
                write_curvemapping(wd, node->storage);
            else if(ntree->type==NTREE_TEXTURE && (node->type==TEX_NODE_CURVE_RGB || node->type==TEX_NODE_CURVE_TIME) )
                write_curvemapping(wd, node->storage);
            else if(ntree->type==NTREE_COMPOSIT && node->type==CMP_NODE_MOVIEDISTORTION)
                /* pass */ ;
            else
                writestruct(wd, DATA, node->typeinfo->storagename, 1, node->storage);
        }
    }
    
    for(link= ntree->links.first; link; link= link->next)
        writestruct(wd, DATA, "bNodeLink", 1, link);
    
    /* external sockets */
    for(sock= ntree->inputs.first; sock; sock= sock->next)
        write_node_socket(wd, sock);
    for(sock= ntree->outputs.first; sock; sock= sock->next)
        write_node_socket(wd, sock);
}

static void current_screen_compat(Main *mainvar, bScreen **screen)
{
    wmWindowManager *wm;
    wmWindow *window;

    /* find a global current screen in the first open window, to have
     * a reasonable default for reading in older versions */
    wm= mainvar->wm.first;
    window= (wm)? wm->windows.first: NULL;
    *screen= (window)? window->screen: NULL;
}

static void write_renderinfo(WriteData *wd, Main *mainvar)      /* for renderdeamon */
{
    bScreen *curscreen;
    Scene *sce;
    int data[8];

    /* XXX in future, handle multiple windows with multiple screnes? */
    current_screen_compat(mainvar, &curscreen);

    for(sce= mainvar->scene.first; sce; sce= sce->id.next) {
        if(sce->id.lib==NULL  && ( sce==curscreen->scene || (sce->r.scemode & R_BG_RENDER)) ) {
            data[0]= sce->r.sfra;
            data[1]= sce->r.efra;

            memset(data+2, 0, sizeof(int)*6);
            BLI_strncpy((char *)(data+2), sce->id.name+2, sizeof(sce->id.name)-2);

            writedata(wd, REND, 32, data);
        }
    }
}

static void write_keymapitem(WriteData *wd, wmKeyMapItem *kmi)
{
    writestruct(wd, DATA, "wmKeyMapItem", 1, kmi);
    if(kmi->properties)
        IDP_WriteProperty(kmi->properties, wd);
}

static void write_userdef(WriteData *wd)
{
    bTheme *btheme;
    wmKeyMap *keymap;
    wmKeyMapItem *kmi;
    wmKeyMapDiffItem *kmdi;
    bAddon *bext;
    uiStyle *style;
    
    writestruct(wd, USER, "UserDef", 1, &U);

    for(btheme= U.themes.first; btheme; btheme=btheme->next)
        writestruct(wd, DATA, "bTheme", 1, btheme);

    for(keymap= U.user_keymaps.first; keymap; keymap=keymap->next) {
        writestruct(wd, DATA, "wmKeyMap", 1, keymap);

        for(kmdi=keymap->diff_items.first; kmdi; kmdi=kmdi->next) {
            writestruct(wd, DATA, "wmKeyMapDiffItem", 1, kmdi);
            if(kmdi->remove_item)
                write_keymapitem(wd, kmdi->remove_item);
            if(kmdi->add_item)
                write_keymapitem(wd, kmdi->add_item);
        }

        for(kmi=keymap->items.first; kmi; kmi=kmi->next)
            write_keymapitem(wd, kmi);
    }

    for(bext= U.addons.first; bext; bext=bext->next)
        writestruct(wd, DATA, "bAddon", 1, bext);
    
    for(style= U.uistyles.first; style; style= style->next) {
        writestruct(wd, DATA, "uiStyle", 1, style);
    }
}

static void write_boid_state(WriteData *wd, BoidState *state)
{
    BoidRule *rule = state->rules.first;
    //BoidCondition *cond = state->conditions.first;

    writestruct(wd, DATA, "BoidState", 1, state);

    for(; rule; rule=rule->next) {
        switch(rule->type) {
            case eBoidRuleType_Goal:
            case eBoidRuleType_Avoid:
                writestruct(wd, DATA, "BoidRuleGoalAvoid", 1, rule);
                break;
            case eBoidRuleType_AvoidCollision:
                writestruct(wd, DATA, "BoidRuleAvoidCollision", 1, rule);
                break;
            case eBoidRuleType_FollowLeader:
                writestruct(wd, DATA, "BoidRuleFollowLeader", 1, rule);
                break;
            case eBoidRuleType_AverageSpeed:
                writestruct(wd, DATA, "BoidRuleAverageSpeed", 1, rule);
                break;
            case eBoidRuleType_Fight:
                writestruct(wd, DATA, "BoidRuleFight", 1, rule);
                break;
            default:
                writestruct(wd, DATA, "BoidRule", 1, rule);
                break;
        }
    }
    //for(; cond; cond=cond->next)
    //  writestruct(wd, DATA, "BoidCondition", 1, cond);
}

/* update this also to readfile.c */
static const char *ptcache_data_struct[] = {
    "", // BPHYS_DATA_INDEX
    "", // BPHYS_DATA_LOCATION
    "", // BPHYS_DATA_VELOCITY
    "", // BPHYS_DATA_ROTATION
    "", // BPHYS_DATA_AVELOCITY / BPHYS_DATA_XCONST */
    "", // BPHYS_DATA_SIZE:
    "", // BPHYS_DATA_TIMES:    
    "BoidData" // case BPHYS_DATA_BOIDS:
};
static const char *ptcache_extra_struct[] = {
    "",
    "ParticleSpring"
};
static void write_pointcaches(WriteData *wd, ListBase *ptcaches)
{
    PointCache *cache = ptcaches->first;
    int i;

    for(; cache; cache=cache->next) {
        writestruct(wd, DATA, "PointCache", 1, cache);

        if((cache->flag & PTCACHE_DISK_CACHE)==0) {
            PTCacheMem *pm = cache->mem_cache.first;

            for(; pm; pm=pm->next) {
                PTCacheExtra *extra = pm->extradata.first;

                writestruct(wd, DATA, "PTCacheMem", 1, pm);
                
                for(i=0; i<BPHYS_TOT_DATA; i++) {
                    if(pm->data[i] && pm->data_types & (1<<i)) {
                        if(ptcache_data_struct[i][0]=='\0')
                            writedata(wd, DATA, MEM_allocN_len(pm->data[i]), pm->data[i]);
                        else
                            writestruct(wd, DATA, ptcache_data_struct[i], pm->totpoint, pm->data[i]);
                    }
                }

                for(; extra; extra=extra->next) {
                    if(ptcache_extra_struct[extra->type][0]=='\0')
                        continue;
                    writestruct(wd, DATA, "PTCacheExtra", 1, extra);
                    writestruct(wd, DATA, ptcache_extra_struct[extra->type], extra->totdata, extra->data);
                }
            }
        }
    }
}
static void write_particlesettings(WriteData *wd, ListBase *idbase)
{
    ParticleSettings *part;
    ParticleDupliWeight *dw;
    GroupObject *go;
    int a;

    part= idbase->first;
    while(part) {
        if(part->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_PA, "ParticleSettings", 1, part);
            if (part->id.properties) IDP_WriteProperty(part->id.properties, wd);
            if (part->adt) write_animdata(wd, part->adt);
            writestruct(wd, DATA, "PartDeflect", 1, part->pd);
            writestruct(wd, DATA, "PartDeflect", 1, part->pd2);
            writestruct(wd, DATA, "EffectorWeights", 1, part->effector_weights);

            dw = part->dupliweights.first;
            for(; dw; dw=dw->next) {
                /* update indices */
                dw->index = 0;
                if(part->dup_group) { /* can be NULL if lining fails or set to None */
                    go = part->dup_group->gobject.first;
                    while(go && go->ob != dw->ob) {
                        go=go->next;
                        dw->index++;
                    }
                }
                writestruct(wd, DATA, "ParticleDupliWeight", 1, dw);
            }

            if(part->boids && part->phystype == PART_PHYS_BOIDS) {
                BoidState *state = part->boids->states.first;

                writestruct(wd, DATA, "BoidSettings", 1, part->boids);

                for(; state; state=state->next)
                    write_boid_state(wd, state);
            }
            if(part->fluid && part->phystype == PART_PHYS_FLUID){
                writestruct(wd, DATA, "SPHFluidSettings", 1, part->fluid); 
            }

            for(a=0; a<MAX_MTEX; a++) {
                if(part->mtex[a]) writestruct(wd, DATA, "MTex", 1, part->mtex[a]);
            }
        }
        part= part->id.next;
    }
}
static void write_particlesystems(WriteData *wd, ListBase *particles)
{
    ParticleSystem *psys= particles->first;
    ParticleTarget *pt;
    int a;

    for(; psys; psys=psys->next) {
        writestruct(wd, DATA, "ParticleSystem", 1, psys);

        if(psys->particles) {
            writestruct(wd, DATA, "ParticleData", psys->totpart ,psys->particles);

            if(psys->particles->hair) {
                ParticleData *pa = psys->particles;

                for(a=0; a<psys->totpart; a++, pa++)
                    writestruct(wd, DATA, "HairKey", pa->totkey, pa->hair);
            }

            if(psys->particles->boid && psys->part->phystype == PART_PHYS_BOIDS)
                writestruct(wd, DATA, "BoidParticle", psys->totpart, psys->particles->boid);

            if(psys->part->fluid && psys->part->phystype == PART_PHYS_FLUID && (psys->part->fluid->flag & SPH_VISCOELASTIC_SPRINGS))
                writestruct(wd, DATA, "ParticleSpring", psys->tot_fluidsprings, psys->fluid_springs);
        }
        pt = psys->targets.first;
        for(; pt; pt=pt->next)
            writestruct(wd, DATA, "ParticleTarget", 1, pt);

        if(psys->child) writestruct(wd, DATA, "ChildParticle", psys->totchild ,psys->child);

        if(psys->clmd) {
            writestruct(wd, DATA, "ClothModifierData", 1, psys->clmd);
            writestruct(wd, DATA, "ClothSimSettings", 1, psys->clmd->sim_parms);
            writestruct(wd, DATA, "ClothCollSettings", 1, psys->clmd->coll_parms);
        }

        write_pointcaches(wd, &psys->ptcaches);
    }
}

static void write_properties(WriteData *wd, ListBase *lb)
{
    bProperty *prop;

    prop= lb->first;
    while(prop) {
        writestruct(wd, DATA, "bProperty", 1, prop);

        if(prop->poin && prop->poin != &prop->data)
            writedata(wd, DATA, MEM_allocN_len(prop->poin), prop->poin);

        prop= prop->next;
    }
}

static void write_sensors(WriteData *wd, ListBase *lb)
{
    bSensor *sens;

    sens= lb->first;
    while(sens) {
        writestruct(wd, DATA, "bSensor", 1, sens);

        writedata(wd, DATA, sizeof(void *)*sens->totlinks, sens->links);

        switch(sens->type) {
        case SENS_NEAR:
            writestruct(wd, DATA, "bNearSensor", 1, sens->data);
            break;
        case SENS_MOUSE:
            writestruct(wd, DATA, "bMouseSensor", 1, sens->data);
            break;
        case SENS_TOUCH:
            writestruct(wd, DATA, "bTouchSensor", 1, sens->data);
            break;
        case SENS_KEYBOARD:
            writestruct(wd, DATA, "bKeyboardSensor", 1, sens->data);
            break;
        case SENS_PROPERTY:
            writestruct(wd, DATA, "bPropertySensor", 1, sens->data);
            break;
        case SENS_ARMATURE:
            writestruct(wd, DATA, "bArmatureSensor", 1, sens->data);
            break;
        case SENS_ACTUATOR:
            writestruct(wd, DATA, "bActuatorSensor", 1, sens->data);
            break;
        case SENS_DELAY:
            writestruct(wd, DATA, "bDelaySensor", 1, sens->data);
            break;
        case SENS_COLLISION:
            writestruct(wd, DATA, "bCollisionSensor", 1, sens->data);
            break;
        case SENS_RADAR:
            writestruct(wd, DATA, "bRadarSensor", 1, sens->data);
            break;
        case SENS_RANDOM:
            writestruct(wd, DATA, "bRandomSensor", 1, sens->data);
            break;
        case SENS_RAY:
            writestruct(wd, DATA, "bRaySensor", 1, sens->data);
            break;
        case SENS_MESSAGE:
            writestruct(wd, DATA, "bMessageSensor", 1, sens->data);
            break;
        case SENS_JOYSTICK:
            writestruct(wd, DATA, "bJoystickSensor", 1, sens->data);
            break;
        default:
            ; /* error: don't know how to write this file */
        }

        sens= sens->next;
    }
}

static void write_controllers(WriteData *wd, ListBase *lb)
{
    bController *cont;

    cont= lb->first;
    while(cont) {
        writestruct(wd, DATA, "bController", 1, cont);

        writedata(wd, DATA, sizeof(void *)*cont->totlinks, cont->links);

        switch(cont->type) {
        case CONT_EXPRESSION:
            writestruct(wd, DATA, "bExpressionCont", 1, cont->data);
            break;
        case CONT_PYTHON:
            writestruct(wd, DATA, "bPythonCont", 1, cont->data);
            break;
        default:
            ; /* error: don't know how to write this file */
        }

        cont= cont->next;
    }
}

static void write_actuators(WriteData *wd, ListBase *lb)
{
    bActuator *act;

    act= lb->first;
    while(act) {
        writestruct(wd, DATA, "bActuator", 1, act);

        switch(act->type) {
        case ACT_ACTION:
        case ACT_SHAPEACTION:
            writestruct(wd, DATA, "bActionActuator", 1, act->data);
            break;
        case ACT_SOUND:
            writestruct(wd, DATA, "bSoundActuator", 1, act->data);
            break;
        case ACT_OBJECT:
            writestruct(wd, DATA, "bObjectActuator", 1, act->data);
            break;
        case ACT_IPO:
            writestruct(wd, DATA, "bIpoActuator", 1, act->data);
            break;
        case ACT_PROPERTY:
            writestruct(wd, DATA, "bPropertyActuator", 1, act->data);
            break;
        case ACT_CAMERA:
            writestruct(wd, DATA, "bCameraActuator", 1, act->data);
            break;
        case ACT_CONSTRAINT:
            writestruct(wd, DATA, "bConstraintActuator", 1, act->data);
            break;
        case ACT_EDIT_OBJECT:
            writestruct(wd, DATA, "bEditObjectActuator", 1, act->data);
            break;
        case ACT_SCENE:
            writestruct(wd, DATA, "bSceneActuator", 1, act->data);
            break;
        case ACT_GROUP:
            writestruct(wd, DATA, "bGroupActuator", 1, act->data);
            break;
        case ACT_RANDOM:
            writestruct(wd, DATA, "bRandomActuator", 1, act->data);
            break;
        case ACT_MESSAGE:
            writestruct(wd, DATA, "bMessageActuator", 1, act->data);
            break;
        case ACT_GAME:
            writestruct(wd, DATA, "bGameActuator", 1, act->data);
            break;
        case ACT_VISIBILITY:
            writestruct(wd, DATA, "bVisibilityActuator", 1, act->data);
            break;
        case ACT_2DFILTER:
            writestruct(wd, DATA, "bTwoDFilterActuator", 1, act->data);
            break;
        case ACT_PARENT:
            writestruct(wd, DATA, "bParentActuator", 1, act->data);
            break;
        case ACT_STATE:
            writestruct(wd, DATA, "bStateActuator", 1, act->data);
            break;
        case ACT_ARMATURE:
            writestruct(wd, DATA, "bArmatureActuator", 1, act->data);
            break;
        case ACT_STEERING:
            writestruct(wd, DATA, "bSteeringActuator", 1, act->data);
            break;
        default:
            ; /* error: don't know how to write this file */
        }

        act= act->next;
    }
}

static void write_motionpath(WriteData *wd, bMotionPath *mpath)
{
    /* sanity checks */
    if (mpath == NULL)
        return;
    
    /* firstly, just write the motionpath struct */
    writestruct(wd, DATA, "bMotionPath", 1, mpath);
    
    /* now write the array of data */
    writestruct(wd, DATA, "bMotionPathVert", mpath->length, mpath->points);
}

static void write_constraints(WriteData *wd, ListBase *conlist)
{
    bConstraint *con;

    for (con=conlist->first; con; con=con->next) {
        bConstraintTypeInfo *cti= constraint_get_typeinfo(con);
        
        /* Write the specific data */
        if (cti && con->data) {
            /* firstly, just write the plain con->data struct */
            writestruct(wd, DATA, cti->structName, 1, con->data);
            
            /* do any constraint specific stuff */
            switch (con->type) {
                case CONSTRAINT_TYPE_PYTHON:
                {
                    bPythonConstraint *data = (bPythonConstraint *)con->data;
                    bConstraintTarget *ct;
                    
                    /* write targets */
                    for (ct= data->targets.first; ct; ct= ct->next)
                        writestruct(wd, DATA, "bConstraintTarget", 1, ct);
                    
                    /* Write ID Properties -- and copy this comment EXACTLY for easy finding
                     of library blocks that implement this.*/
                    IDP_WriteProperty(data->prop, wd);
                }
                    break;
                case CONSTRAINT_TYPE_SPLINEIK: 
                {
                    bSplineIKConstraint *data= (bSplineIKConstraint*)con->data;
                    
                    /* write points array */
                    writedata(wd, DATA, sizeof(float)*(data->numpoints), data->points);
                }
                    break;
            }
        }
        
        /* Write the constraint */
        writestruct(wd, DATA, "bConstraint", 1, con);
    }
}

static void write_pose(WriteData *wd, bPose *pose)
{
    bPoseChannel *chan;
    bActionGroup *grp;

    /* Write each channel */
    if (!pose)
        return;

    /* Write channels */
    for (chan=pose->chanbase.first; chan; chan=chan->next) {
        /* Write ID Properties -- and copy this comment EXACTLY for easy finding
         of library blocks that implement this.*/
        if (chan->prop)
            IDP_WriteProperty(chan->prop, wd);
        
        write_constraints(wd, &chan->constraints);
        
        write_motionpath(wd, chan->mpath);
        
        /* prevent crashes with autosave, when a bone duplicated in editmode has not yet been assigned to its posechannel */
        if (chan->bone) 
            chan->selectflag= chan->bone->flag & BONE_SELECTED; /* gets restored on read, for library armatures */
        
        writestruct(wd, DATA, "bPoseChannel", 1, chan);
    }
    
    /* Write groups */
    for (grp=pose->agroups.first; grp; grp=grp->next) 
        writestruct(wd, DATA, "bActionGroup", 1, grp);

    /* write IK param */
    if (pose->ikparam) {
        char *structname = (char *)get_ikparam_name(pose);
        if (structname)
            writestruct(wd, DATA, structname, 1, pose->ikparam);
    }

    /* Write this pose */
    writestruct(wd, DATA, "bPose", 1, pose);

}

static void write_defgroups(WriteData *wd, ListBase *defbase)
{
    bDeformGroup    *defgroup;

    for (defgroup=defbase->first; defgroup; defgroup=defgroup->next)
        writestruct(wd, DATA, "bDeformGroup", 1, defgroup);
}

static void write_modifiers(WriteData *wd, ListBase *modbase)
{
    ModifierData *md;

    if (modbase == NULL) return;
    for (md=modbase->first; md; md= md->next) {
        ModifierTypeInfo *mti = modifierType_getInfo(md->type);
        if (mti == NULL) return;
        
        writestruct(wd, DATA, mti->structName, 1, md);
            
        if (md->type==eModifierType_Hook) {
            HookModifierData *hmd = (HookModifierData*) md;
            
            writedata(wd, DATA, sizeof(int)*hmd->totindex, hmd->indexar);
        }
        else if(md->type==eModifierType_Cloth) {
            ClothModifierData *clmd = (ClothModifierData*) md;
            
            writestruct(wd, DATA, "ClothSimSettings", 1, clmd->sim_parms);
            writestruct(wd, DATA, "ClothCollSettings", 1, clmd->coll_parms);
            writestruct(wd, DATA, "EffectorWeights", 1, clmd->sim_parms->effector_weights);
            write_pointcaches(wd, &clmd->ptcaches);
        } 
        else if(md->type==eModifierType_Smoke) {
            SmokeModifierData *smd = (SmokeModifierData*) md;
            
            if(smd->type & MOD_SMOKE_TYPE_DOMAIN)
            {
                if(smd->domain)
                {
                    write_pointcaches(wd, &(smd->domain->ptcaches[0]));

                    /* create fake pointcache so that old blender versions can read it */
                    smd->domain->point_cache[1] = BKE_ptcache_add(&smd->domain->ptcaches[1]);
                    smd->domain->point_cache[1]->flag |= PTCACHE_DISK_CACHE|PTCACHE_FAKE_SMOKE;
                    smd->domain->point_cache[1]->step = 1;

                    write_pointcaches(wd, &(smd->domain->ptcaches[1]));
                }
                
                writestruct(wd, DATA, "SmokeDomainSettings", 1, smd->domain);

                if(smd->domain) {
                    /* cleanup the fake pointcache */
                    BKE_ptcache_free_list(&smd->domain->ptcaches[1]);
                    smd->domain->point_cache[1] = NULL;
                    
                    writestruct(wd, DATA, "EffectorWeights", 1, smd->domain->effector_weights);
                }
            }
            else if(smd->type & MOD_SMOKE_TYPE_FLOW)
                writestruct(wd, DATA, "SmokeFlowSettings", 1, smd->flow);
            else if(smd->type & MOD_SMOKE_TYPE_COLL)
                writestruct(wd, DATA, "SmokeCollSettings", 1, smd->coll);
        } 
        else if(md->type==eModifierType_Fluidsim) {
            FluidsimModifierData *fluidmd = (FluidsimModifierData*) md;
            
            writestruct(wd, DATA, "FluidsimSettings", 1, fluidmd->fss);
        }
        else if(md->type==eModifierType_DynamicPaint) {
            DynamicPaintModifierData *pmd = (DynamicPaintModifierData*) md;
            
            if(pmd->canvas)
            {
                DynamicPaintSurface *surface;
                writestruct(wd, DATA, "DynamicPaintCanvasSettings", 1, pmd->canvas);
                
                /* write surfaces */
                for (surface=pmd->canvas->surfaces.first; surface; surface=surface->next)
                    writestruct(wd, DATA, "DynamicPaintSurface", 1, surface);
                /* write caches and effector weights */
                for (surface=pmd->canvas->surfaces.first; surface; surface=surface->next) {
                    write_pointcaches(wd, &(surface->ptcaches));

                    writestruct(wd, DATA, "EffectorWeights", 1, surface->effector_weights);
                }
            }
            if(pmd->brush)
            {
                writestruct(wd, DATA, "DynamicPaintBrushSettings", 1, pmd->brush);
                writestruct(wd, DATA, "ColorBand", 1, pmd->brush->paint_ramp);
                writestruct(wd, DATA, "ColorBand", 1, pmd->brush->vel_ramp);
            }
        } 
        else if (md->type==eModifierType_Collision) {
            
            /*
            CollisionModifierData *collmd = (CollisionModifierData*) md;
            // TODO: CollisionModifier should use pointcache 
            // + have proper reset events before enabling this
            writestruct(wd, DATA, "MVert", collmd->numverts, collmd->x);
            writestruct(wd, DATA, "MVert", collmd->numverts, collmd->xnew);
            writestruct(wd, DATA, "MFace", collmd->numfaces, collmd->mfaces);
            */
        }
        else if (md->type==eModifierType_MeshDeform) {
            MeshDeformModifierData *mmd = (MeshDeformModifierData*) md;
            int size = mmd->dyngridsize;

            writestruct(wd, DATA, "MDefInfluence", mmd->totinfluence, mmd->bindinfluences);
            writedata(wd, DATA, sizeof(int)*(mmd->totvert+1), mmd->bindoffsets);
            writedata(wd, DATA, sizeof(float)*3*mmd->totcagevert,
                mmd->bindcagecos);
            writestruct(wd, DATA, "MDefCell", size*size*size, mmd->dyngrid);
            writestruct(wd, DATA, "MDefInfluence", mmd->totinfluence, mmd->dyninfluences);
            writedata(wd, DATA, sizeof(int)*mmd->totvert, mmd->dynverts);
        }
        else if (md->type==eModifierType_Warp) {
            WarpModifierData *tmd = (WarpModifierData*) md;
            if(tmd->curfalloff) {
                write_curvemapping(wd, tmd->curfalloff);
            }
        }
        else if (md->type==eModifierType_WeightVGEdit) {
            WeightVGEditModifierData *wmd = (WeightVGEditModifierData*) md;

            if (wmd->cmap_curve)
                write_curvemapping(wd, wmd->cmap_curve);
        }
    }
}

static void write_objects(WriteData *wd, ListBase *idbase)
{
    Object *ob;
    
    ob= idbase->first;
    while(ob) {
        if(ob->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_OB, "Object", 1, ob);
            
            /*Write ID Properties -- and copy this comment EXACTLY for easy finding
              of library blocks that implement this.*/
            if (ob->id.properties) IDP_WriteProperty(ob->id.properties, wd);
            
            if (ob->adt) write_animdata(wd, ob->adt);
            
            /* direct data */
            writedata(wd, DATA, sizeof(void *)*ob->totcol, ob->mat);
            writedata(wd, DATA, sizeof(char)*ob->totcol, ob->matbits);
            /* write_effects(wd, &ob->effect); */ /* not used anymore */
            write_properties(wd, &ob->prop);
            write_sensors(wd, &ob->sensors);
            write_controllers(wd, &ob->controllers);
            write_actuators(wd, &ob->actuators);

            if (ob->type == OB_ARMATURE) {
                bArmature *arm = ob->data;
                if (arm && ob->pose && arm->act_bone) {
                    BLI_strncpy(ob->pose->proxy_act_bone, arm->act_bone->name, sizeof(ob->pose->proxy_act_bone));
                }
            }

            write_pose(wd, ob->pose);
            write_defgroups(wd, &ob->defbase);
            write_constraints(wd, &ob->constraints);
            write_motionpath(wd, ob->mpath);
            
            writestruct(wd, DATA, "PartDeflect", 1, ob->pd);
            writestruct(wd, DATA, "SoftBody", 1, ob->soft);
            if(ob->soft) {
                write_pointcaches(wd, &ob->soft->ptcaches);
                writestruct(wd, DATA, "EffectorWeights", 1, ob->soft->effector_weights);
            }
            writestruct(wd, DATA, "BulletSoftBody", 1, ob->bsoft);
            
            write_particlesystems(wd, &ob->particlesystem);
            write_modifiers(wd, &ob->modifiers);
        }
        ob= ob->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}


static void write_vfonts(WriteData *wd, ListBase *idbase)
{
    VFont *vf;
    PackedFile * pf;

    vf= idbase->first;
    while(vf) {
        if(vf->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_VF, "VFont", 1, vf);
            if (vf->id.properties) IDP_WriteProperty(vf->id.properties, wd);

            /* direct data */

            if (vf->packedfile) {
                pf = vf->packedfile;
                writestruct(wd, DATA, "PackedFile", 1, pf);
                writedata(wd, DATA, pf->size, pf->data);
            }
        }

        vf= vf->id.next;
    }
}


static void write_keys(WriteData *wd, ListBase *idbase)
{
    Key *key;
    KeyBlock *kb;

    key= idbase->first;
    while(key) {
        if(key->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_KE, "Key", 1, key);
            if (key->id.properties) IDP_WriteProperty(key->id.properties, wd);
            
            if (key->adt) write_animdata(wd, key->adt);
            
            /* direct data */
            kb= key->block.first;
            while(kb) {
                writestruct(wd, DATA, "KeyBlock", 1, kb);
                if(kb->data) writedata(wd, DATA, kb->totelem*key->elemsize, kb->data);
                kb= kb->next;
            }
        }

        key= key->id.next;
    }
    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_cameras(WriteData *wd, ListBase *idbase)
{
    Camera *cam;

    cam= idbase->first;
    while(cam) {
        if(cam->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_CA, "Camera", 1, cam);
            if (cam->id.properties) IDP_WriteProperty(cam->id.properties, wd);
            
            if (cam->adt) write_animdata(wd, cam->adt);
        }

        cam= cam->id.next;
    }
}

static void write_mballs(WriteData *wd, ListBase *idbase)
{
    MetaBall *mb;
    MetaElem *ml;

    mb= idbase->first;
    while(mb) {
        if(mb->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_MB, "MetaBall", 1, mb);
            if (mb->id.properties) IDP_WriteProperty(mb->id.properties, wd);

            /* direct data */
            writedata(wd, DATA, sizeof(void *)*mb->totcol, mb->mat);
            if (mb->adt) write_animdata(wd, mb->adt);

            ml= mb->elems.first;
            while(ml) {
                writestruct(wd, DATA, "MetaElem", 1, ml);
                ml= ml->next;
            }
        }
        mb= mb->id.next;
    }
}

static int amount_of_chars(char *str)
{
    // Since the data is saved as UTF-8 to the cu->str
    // The cu->len is not same as the strlen(cu->str)
    return strlen(str);
}

static void write_curves(WriteData *wd, ListBase *idbase)
{
    Curve *cu;
    Nurb *nu;

    cu= idbase->first;
    while(cu) {
        if(cu->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_CU, "Curve", 1, cu);
            
            /* direct data */
            writedata(wd, DATA, sizeof(void *)*cu->totcol, cu->mat);
            if (cu->id.properties) IDP_WriteProperty(cu->id.properties, wd);
            if (cu->adt) write_animdata(wd, cu->adt);
            
            if(cu->vfont) {
                writedata(wd, DATA, amount_of_chars(cu->str)+1, cu->str);
                writestruct(wd, DATA, "CharInfo", cu->len+1, cu->strinfo);
                writestruct(wd, DATA, "TextBox", cu->totbox, cu->tb);               
            }
            else {
                /* is also the order of reading */
                nu= cu->nurb.first;
                while(nu) {
                    writestruct(wd, DATA, "Nurb", 1, nu);
                    nu= nu->next;
                }
                nu= cu->nurb.first;
                while(nu) {
                    if(nu->type == CU_BEZIER)
                        writestruct(wd, DATA, "BezTriple", nu->pntsu, nu->bezt);
                    else {
                        writestruct(wd, DATA, "BPoint", nu->pntsu*nu->pntsv, nu->bp);
                        if(nu->knotsu) writedata(wd, DATA, KNOTSU(nu)*sizeof(float), nu->knotsu);
                        if(nu->knotsv) writedata(wd, DATA, KNOTSV(nu)*sizeof(float), nu->knotsv);
                    }
                    nu= nu->next;
                }
            }
        }
        cu= cu->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_dverts(WriteData *wd, int count, MDeformVert *dvlist)
{
    if (dvlist) {
        int i;
        
        /* Write the dvert list */
        writestruct(wd, DATA, "MDeformVert", count, dvlist);
        
        /* Write deformation data for each dvert */
        for (i=0; i<count; i++) {
            if (dvlist[i].dw)
                writestruct(wd, DATA, "MDeformWeight", dvlist[i].totweight, dvlist[i].dw);
        }
    }
}

static void write_mdisps(WriteData *wd, int count, MDisps *mdlist, int external)
{
    if(mdlist) {
        int i;
        
        writestruct(wd, DATA, "MDisps", count, mdlist);
        if(!external) {
            for(i = 0; i < count; ++i) {
                if(mdlist[i].disps)
                    writedata(wd, DATA, sizeof(float)*3*mdlist[i].totdisp, mdlist[i].disps);
            }
        }
    }
}

static void write_customdata(WriteData *wd, ID *id, int count, CustomData *data, int partial_type, int partial_count)
{
    int i;

    /* write external customdata (not for undo) */
    if(data->external && !wd->current)
        CustomData_external_write(data, id, CD_MASK_MESH, count, 0);

    writestruct(wd, DATA, "CustomDataLayer", data->maxlayer, data->layers);

    for (i=0; i<data->totlayer; i++) {
        CustomDataLayer *layer= &data->layers[i];
        const char *structname;
        int structnum, datasize;

        if (layer->type == CD_MDEFORMVERT) {
            /* layer types that allocate own memory need special handling */
            write_dverts(wd, count, layer->data);
        }
        else if (layer->type == CD_MDISPS) {
            write_mdisps(wd, count, layer->data, layer->flag & CD_FLAG_EXTERNAL);
        }
        else {
            CustomData_file_write_info(layer->type, &structname, &structnum);
            if (structnum) {
                /* when using partial visibility, the MEdge and MFace layers
                   are smaller than the original, so their type and count is
                   passed to make this work */
                if (layer->type != partial_type) datasize= structnum*count;
                else datasize= structnum*partial_count;

                writestruct(wd, DATA, structname, datasize, layer->data);
            }
            else
                printf("%s error: layer '%s':%d - can't be written to file\n",
                       __func__, structname, layer->type);
        }
    }

    if(data->external)
        writestruct(wd, DATA, "CustomDataExternal", 1, data->external);
}

static void write_meshs(WriteData *wd, ListBase *idbase)
{
    Mesh *mesh;

    mesh= idbase->first;
    while(mesh) {
        if(mesh->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_ME, "Mesh", 1, mesh);

            /* direct data */
            if (mesh->id.properties) IDP_WriteProperty(mesh->id.properties, wd);
            if (mesh->adt) write_animdata(wd, mesh->adt);

            writedata(wd, DATA, sizeof(void *)*mesh->totcol, mesh->mat);

            write_customdata(wd, &mesh->id, mesh->totvert, &mesh->vdata, -1, 0);
            write_customdata(wd, &mesh->id, mesh->totedge, &mesh->edata, -1, 0);
            write_customdata(wd, &mesh->id, mesh->totface, &mesh->fdata, -1, 0);
        }
        mesh= mesh->id.next;
    }
}

static void write_lattices(WriteData *wd, ListBase *idbase)
{
    Lattice *lt;
    
    lt= idbase->first;
    while(lt) {
        if(lt->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_LT, "Lattice", 1, lt);
            if (lt->id.properties) IDP_WriteProperty(lt->id.properties, wd);
            
            /* write animdata */
            if (lt->adt) write_animdata(wd, lt->adt);
            
            /* direct data */
            writestruct(wd, DATA, "BPoint", lt->pntsu*lt->pntsv*lt->pntsw, lt->def);
            
            write_dverts(wd, lt->pntsu*lt->pntsv*lt->pntsw, lt->dvert);
            
        }
        lt= lt->id.next;
    }
}

static void write_previews(WriteData *wd, PreviewImage *prv)
{
    if (prv) {
        short w = prv->w[1];
        short h = prv->h[1];
        unsigned int *rect = prv->rect[1];
        /* don't write out large previews if not requested */
        if (!(U.flag & USER_SAVE_PREVIEWS) ) {
            prv->w[1] = 0;
            prv->h[1] = 0;
            prv->rect[1] = NULL;
        }
        writestruct(wd, DATA, "PreviewImage", 1, prv);
        if (prv->rect[0]) writedata(wd, DATA, prv->w[0]*prv->h[0]*sizeof(unsigned int), prv->rect[0]);
        if (prv->rect[1]) writedata(wd, DATA, prv->w[1]*prv->h[1]*sizeof(unsigned int), prv->rect[1]);

        /* restore preview, we still want to keep it in memory even if not saved to file */
        if (!(U.flag & USER_SAVE_PREVIEWS) ) {
            prv->w[1] = w;
            prv->h[1] = h;
            prv->rect[1] = rect;
        }
    }
}

static void write_images(WriteData *wd, ListBase *idbase)
{
    Image *ima;
    PackedFile * pf;


    ima= idbase->first;
    while(ima) {
        if(ima->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_IM, "Image", 1, ima);
            if (ima->id.properties) IDP_WriteProperty(ima->id.properties, wd);

            if (ima->packedfile) {
                pf = ima->packedfile;
                writestruct(wd, DATA, "PackedFile", 1, pf);
                writedata(wd, DATA, pf->size, pf->data);
            }

            write_previews(wd, ima->preview);
        }
        ima= ima->id.next;
    }
    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_textures(WriteData *wd, ListBase *idbase)
{
    Tex *tex;

    tex= idbase->first;
    while(tex) {
        if(tex->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_TE, "Tex", 1, tex);
            if (tex->id.properties) IDP_WriteProperty(tex->id.properties, wd);

            if (tex->adt) write_animdata(wd, tex->adt);

            /* direct data */
            if(tex->type == TEX_PLUGIN && tex->plugin) writestruct(wd, DATA, "PluginTex", 1, tex->plugin);
            if(tex->coba) writestruct(wd, DATA, "ColorBand", 1, tex->coba);
            if(tex->type == TEX_ENVMAP && tex->env) writestruct(wd, DATA, "EnvMap", 1, tex->env);
            if(tex->type == TEX_POINTDENSITY && tex->pd) {
                writestruct(wd, DATA, "PointDensity", 1, tex->pd);
                if(tex->pd->coba) writestruct(wd, DATA, "ColorBand", 1, tex->pd->coba);
                if(tex->pd->falloff_curve) write_curvemapping(wd, tex->pd->falloff_curve);
            }
            if(tex->type == TEX_VOXELDATA) writestruct(wd, DATA, "VoxelData", 1, tex->vd);
            if(tex->type == TEX_OCEAN && tex->ot) writestruct(wd, DATA, "OceanTex", 1, tex->ot);
            
            /* nodetree is integral part of texture, no libdata */
            if(tex->nodetree) {
                writestruct(wd, DATA, "bNodeTree", 1, tex->nodetree);
                write_nodetree(wd, tex->nodetree);
            }
            
            write_previews(wd, tex->preview);
        }
        tex= tex->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_materials(WriteData *wd, ListBase *idbase)
{
    Material *ma;
    int a;

    ma= idbase->first;
    while(ma) {
        if(ma->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_MA, "Material", 1, ma);
            
            /*Write ID Properties -- and copy this comment EXACTLY for easy finding
              of library blocks that implement this.*/
            /*manually set head group property to IDP_GROUP, just in case it hadn't been
              set yet :) */
            if (ma->id.properties) IDP_WriteProperty(ma->id.properties, wd);
            
            if (ma->adt) write_animdata(wd, ma->adt);

            for(a=0; a<MAX_MTEX; a++) {
                if(ma->mtex[a]) writestruct(wd, DATA, "MTex", 1, ma->mtex[a]);
            }
            
            if(ma->ramp_col) writestruct(wd, DATA, "ColorBand", 1, ma->ramp_col);
            if(ma->ramp_spec) writestruct(wd, DATA, "ColorBand", 1, ma->ramp_spec);
            
            /* nodetree is integral part of material, no libdata */
            if(ma->nodetree) {
                writestruct(wd, DATA, "bNodeTree", 1, ma->nodetree);
                write_nodetree(wd, ma->nodetree);
            }

            write_previews(wd, ma->preview);            
        }
        ma= ma->id.next;
    }
}

static void write_worlds(WriteData *wd, ListBase *idbase)
{
    World *wrld;
    int a;

    wrld= idbase->first;
    while(wrld) {
        if(wrld->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_WO, "World", 1, wrld);
            if (wrld->id.properties) IDP_WriteProperty(wrld->id.properties, wd);
            
            if (wrld->adt) write_animdata(wd, wrld->adt);
            
            for(a=0; a<MAX_MTEX; a++) {
                if(wrld->mtex[a]) writestruct(wd, DATA, "MTex", 1, wrld->mtex[a]);
            }

            /* nodetree is integral part of lamps, no libdata */
            if(wrld->nodetree) {
                writestruct(wd, DATA, "bNodeTree", 1, wrld->nodetree);
                write_nodetree(wd, wrld->nodetree);
            }
            
            write_previews(wd, wrld->preview);
        }
        wrld= wrld->id.next;
    }
}

static void write_lamps(WriteData *wd, ListBase *idbase)
{
    Lamp *la;
    int a;

    la= idbase->first;
    while(la) {
        if(la->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_LA, "Lamp", 1, la);
            if (la->id.properties) IDP_WriteProperty(la->id.properties, wd);
            
            if (la->adt) write_animdata(wd, la->adt);
            
            /* direct data */
            for(a=0; a<MAX_MTEX; a++) {
                if(la->mtex[a]) writestruct(wd, DATA, "MTex", 1, la->mtex[a]);
            }
            
            if(la->curfalloff)
                write_curvemapping(wd, la->curfalloff); 
            
            /* nodetree is integral part of lamps, no libdata */
            if(la->nodetree) {
                writestruct(wd, DATA, "bNodeTree", 1, la->nodetree);
                write_nodetree(wd, la->nodetree);
            }

            write_previews(wd, la->preview);
            
        }
        la= la->id.next;
    }
}


static void write_scenes(WriteData *wd, ListBase *scebase)
{
    Scene *sce;
    Base *base;
    Editing *ed;
    Sequence *seq;
    MetaStack *ms;
    Strip *strip;
    TimeMarker *marker;
    TransformOrientation *ts;
    SceneRenderLayer *srl;
    ToolSettings *tos;
    
    sce= scebase->first;
    while(sce) {
        /* write LibData */
        writestruct(wd, ID_SCE, "Scene", 1, sce);
        if (sce->id.properties) IDP_WriteProperty(sce->id.properties, wd);
        
        if (sce->adt) write_animdata(wd, sce->adt);
        write_keyingsets(wd, &sce->keyingsets);
        
        /* direct data */
        base= sce->base.first;
        while(base) {
            writestruct(wd, DATA, "Base", 1, base);
            base= base->next;
        }
        
        tos = sce->toolsettings;
        writestruct(wd, DATA, "ToolSettings", 1, tos);
        if(tos->vpaint) {
            writestruct(wd, DATA, "VPaint", 1, tos->vpaint);
        }
        if(tos->wpaint) {
            writestruct(wd, DATA, "VPaint", 1, tos->wpaint);
        }
        if(tos->sculpt) {
            writestruct(wd, DATA, "Sculpt", 1, tos->sculpt);
        }

        // write_paint(wd, &tos->imapaint.paint);

        ed= sce->ed;
        if(ed) {
            writestruct(wd, DATA, "Editing", 1, ed);
            
            /* reset write flags too */
            
            SEQ_BEGIN(ed, seq) {
                if(seq->strip) seq->strip->done= 0;
                writestruct(wd, DATA, "Sequence", 1, seq);
            }
            SEQ_END
            
            SEQ_BEGIN(ed, seq) {
                if(seq->strip && seq->strip->done==0) {
                    /* write strip with 'done' at 0 because readfile */
                    
                    if(seq->plugin) writestruct(wd, DATA, "PluginSeq", 1, seq->plugin);
                    if(seq->effectdata) {
                        switch(seq->type){
                        case SEQ_COLOR:
                            writestruct(wd, DATA, "SolidColorVars", 1, seq->effectdata);
                            break;
                        case SEQ_SPEED:
                            writestruct(wd, DATA, "SpeedControlVars", 1, seq->effectdata);
                            break;
                        case SEQ_WIPE:
                            writestruct(wd, DATA, "WipeVars", 1, seq->effectdata);
                            break;
                        case SEQ_GLOW:
                            writestruct(wd, DATA, "GlowVars", 1, seq->effectdata);
                            break;
                        case SEQ_TRANSFORM:
                            writestruct(wd, DATA, "TransformVars", 1, seq->effectdata);
                            break;
                        }
                    }
                    
                    strip= seq->strip;
                    writestruct(wd, DATA, "Strip", 1, strip);
                    if(seq->flag & SEQ_USE_CROP && strip->crop) {
                        writestruct(wd, DATA, "StripCrop", 1, strip->crop);
                    }
                    if(seq->flag & SEQ_USE_TRANSFORM && strip->transform) {
                        writestruct(wd, DATA, "StripTransform", 1, strip->transform);
                    }
                    if(seq->flag & SEQ_USE_PROXY && strip->proxy) {
                        writestruct(wd, DATA, "StripProxy", 1, strip->proxy);
                    }
                    if(seq->flag & SEQ_USE_COLOR_BALANCE && strip->color_balance) {
                        writestruct(wd, DATA, "StripColorBalance", 1, strip->color_balance);
                    }
                    if(seq->type==SEQ_IMAGE)
                        writestruct(wd, DATA, "StripElem", MEM_allocN_len(strip->stripdata) / sizeof(struct StripElem), strip->stripdata);
                    else if(seq->type==SEQ_MOVIE || seq->type==SEQ_RAM_SOUND || seq->type == SEQ_HD_SOUND)
                        writestruct(wd, DATA, "StripElem", 1, strip->stripdata);
                    
                    strip->done= 1;
                }
            }
            SEQ_END
                
            /* new; meta stack too, even when its nasty restore code */
            for(ms= ed->metastack.first; ms; ms= ms->next) {
                writestruct(wd, DATA, "MetaStack", 1, ms);
            }
        }
        
        if (sce->r.avicodecdata) {
            writestruct(wd, DATA, "AviCodecData", 1, sce->r.avicodecdata);
            if (sce->r.avicodecdata->lpFormat) writedata(wd, DATA, sce->r.avicodecdata->cbFormat, sce->r.avicodecdata->lpFormat);
            if (sce->r.avicodecdata->lpParms) writedata(wd, DATA, sce->r.avicodecdata->cbParms, sce->r.avicodecdata->lpParms);
        }

        if (sce->r.qtcodecdata) {
            writestruct(wd, DATA, "QuicktimeCodecData", 1, sce->r.qtcodecdata);
            if (sce->r.qtcodecdata->cdParms) writedata(wd, DATA, sce->r.qtcodecdata->cdSize, sce->r.qtcodecdata->cdParms);
        }
        if (sce->r.ffcodecdata.properties) {
            IDP_WriteProperty(sce->r.ffcodecdata.properties, wd);
        }

        /* writing dynamic list of TimeMarkers to the blend file */
        for(marker= sce->markers.first; marker; marker= marker->next)
            writestruct(wd, DATA, "TimeMarker", 1, marker);
        
        /* writing dynamic list of TransformOrientations to the blend file */
        for(ts = sce->transform_spaces.first; ts; ts = ts->next)
            writestruct(wd, DATA, "TransformOrientation", 1, ts);
        
        for(srl= sce->r.layers.first; srl; srl= srl->next)
            writestruct(wd, DATA, "SceneRenderLayer", 1, srl);
        
        if(sce->nodetree) {
            writestruct(wd, DATA, "bNodeTree", 1, sce->nodetree);
            write_nodetree(wd, sce->nodetree);
        }
        
        sce= sce->id.next;
    }
    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_gpencils(WriteData *wd, ListBase *lb)
{
    bGPdata *gpd;
    bGPDlayer *gpl;
    bGPDframe *gpf;
    bGPDstroke *gps;
    
    for (gpd= lb->first; gpd; gpd= gpd->id.next) {
        if (gpd->id.us>0 || wd->current) {
            /* write gpd data block to file */
            writestruct(wd, ID_GD, "bGPdata", 1, gpd);
            
            /* write grease-pencil layers to file */
            for (gpl= gpd->layers.first; gpl; gpl= gpl->next) {
                writestruct(wd, DATA, "bGPDlayer", 1, gpl);
                
                /* write this layer's frames to file */
                for (gpf= gpl->frames.first; gpf; gpf= gpf->next) {
                    writestruct(wd, DATA, "bGPDframe", 1, gpf);
                    
                    /* write strokes */
                    for (gps= gpf->strokes.first; gps; gps= gps->next) {
                        writestruct(wd, DATA, "bGPDstroke", 1, gps);
                        writestruct(wd, DATA, "bGPDspoint", gps->totpoints, gps->points);               
                    }
                }
            }
        }
    }
}

static void write_windowmanagers(WriteData *wd, ListBase *lb)
{
    wmWindowManager *wm;
    wmWindow *win;
    
    for(wm= lb->first; wm; wm= wm->id.next) {
        writestruct(wd, ID_WM, "wmWindowManager", 1, wm);
        
        for(win= wm->windows.first; win; win= win->next)
            writestruct(wd, DATA, "wmWindow", 1, win);
    }
}

static void write_region(WriteData *wd, ARegion *ar, int spacetype)
{   
    writestruct(wd, DATA, "ARegion", 1, ar);
    
    if(ar->regiondata) {
        switch(spacetype) {
            case SPACE_VIEW3D:
                if(ar->regiontype==RGN_TYPE_WINDOW) {
                    RegionView3D *rv3d= ar->regiondata;
                    writestruct(wd, DATA, "RegionView3D", 1, rv3d);
                    
                    if(rv3d->localvd)
                        writestruct(wd, DATA, "RegionView3D", 1, rv3d->localvd);
                    if(rv3d->clipbb) 
                        writestruct(wd, DATA, "BoundBox", 1, rv3d->clipbb);

                }
                else
                    printf("regiondata write missing!\n");
                break;
            default:
                printf("regiondata write missing!\n");
        }
    }
}

static void write_screens(WriteData *wd, ListBase *scrbase)
{
    bScreen *sc;
    ScrArea *sa;
    ScrVert *sv;
    ScrEdge *se;

    sc= scrbase->first;
    while(sc) {
        
        /* write LibData */
        /* in 2.50+ files, the file identifier for screens is patched, forward compatibility */
        writestruct(wd, ID_SCRN, "Screen", 1, sc);
        if (sc->id.properties) 
            IDP_WriteProperty(sc->id.properties, wd);
        
        /* direct data */
        for(sv= sc->vertbase.first; sv; sv= sv->next)
            writestruct(wd, DATA, "ScrVert", 1, sv);
        
        for(se= sc->edgebase.first; se; se= se->next) 
            writestruct(wd, DATA, "ScrEdge", 1, se);
        
        for(sa= sc->areabase.first; sa; sa= sa->next) {
            SpaceLink *sl;
            Panel *pa;
            ARegion *ar;
            
            writestruct(wd, DATA, "ScrArea", 1, sa);
            
            for(ar= sa->regionbase.first; ar; ar= ar->next) {
                write_region(wd, ar, sa->spacetype);
                
                for(pa= ar->panels.first; pa; pa= pa->next)
                    writestruct(wd, DATA, "Panel", 1, pa);
            }
            
            sl= sa->spacedata.first;
            while(sl) {
                for(ar= sl->regionbase.first; ar; ar= ar->next)
                    write_region(wd, ar, sl->spacetype);
                
                if(sl->spacetype==SPACE_VIEW3D) {
                    View3D *v3d= (View3D *) sl;
                    BGpic *bgpic;
                    writestruct(wd, DATA, "View3D", 1, v3d);
                    for (bgpic= v3d->bgpicbase.first; bgpic; bgpic= bgpic->next)
                        writestruct(wd, DATA, "BGpic", 1, bgpic);
                    if(v3d->localvd) writestruct(wd, DATA, "View3D", 1, v3d->localvd);
                }
                else if(sl->spacetype==SPACE_IPO) {
                    SpaceIpo *sipo= (SpaceIpo *)sl;
                    ListBase tmpGhosts = sipo->ghostCurves;
                    
                    /* temporarily disable ghost curves when saving */
                    sipo->ghostCurves.first= sipo->ghostCurves.last= NULL;
                    
                    writestruct(wd, DATA, "SpaceIpo", 1, sl);
                    if(sipo->ads) writestruct(wd, DATA, "bDopeSheet", 1, sipo->ads);
                    
                    /* reenable ghost curves */
                    sipo->ghostCurves= tmpGhosts;
                }
                else if(sl->spacetype==SPACE_BUTS) {
                    writestruct(wd, DATA, "SpaceButs", 1, sl);
                }
                else if(sl->spacetype==SPACE_FILE) {
                    SpaceFile *sfile= (SpaceFile *)sl;

                    writestruct(wd, DATA, "SpaceFile", 1, sl);
                    if(sfile->params)
                        writestruct(wd, DATA, "FileSelectParams", 1, sfile->params);
                }
                else if(sl->spacetype==SPACE_SEQ) {
                    writestruct(wd, DATA, "SpaceSeq", 1, sl);
                }
                else if(sl->spacetype==SPACE_OUTLINER) {
                    SpaceOops *so= (SpaceOops *)sl;
                    
                    writestruct(wd, DATA, "SpaceOops", 1, so);

                    /* outliner */
                    if(so->treestore) {
                        writestruct(wd, DATA, "TreeStore", 1, so->treestore);
                        if(so->treestore->data)
                            writestruct(wd, DATA, "TreeStoreElem", so->treestore->usedelem, so->treestore->data);
                    }
                }
                else if(sl->spacetype==SPACE_IMAGE) {
                    SpaceImage *sima= (SpaceImage *)sl;
                    
                    writestruct(wd, DATA, "SpaceImage", 1, sl);
                    if(sima->cumap)
                        write_curvemapping(wd, sima->cumap);
                }
                else if(sl->spacetype==SPACE_TEXT) {
                    writestruct(wd, DATA, "SpaceText", 1, sl);
                }
                else if(sl->spacetype==SPACE_SCRIPT) {
                    SpaceScript *scr = (SpaceScript*)sl;
                    scr->but_refs = NULL;
                    writestruct(wd, DATA, "SpaceScript", 1, sl);
                }
                else if(sl->spacetype==SPACE_ACTION) {
                    writestruct(wd, DATA, "SpaceAction", 1, sl);
                }
                else if(sl->spacetype==SPACE_NLA){
                    SpaceNla *snla= (SpaceNla *)sl;
                    
                    writestruct(wd, DATA, "SpaceNla", 1, snla);
                    if(snla->ads) writestruct(wd, DATA, "bDopeSheet", 1, snla->ads);
                }
                else if(sl->spacetype==SPACE_TIME){
                    writestruct(wd, DATA, "SpaceTime", 1, sl);
                }
                else if(sl->spacetype==SPACE_NODE){
                    writestruct(wd, DATA, "SpaceNode", 1, sl);
                }
                else if(sl->spacetype==SPACE_LOGIC){
                    writestruct(wd, DATA, "SpaceLogic", 1, sl);
                }
                else if(sl->spacetype==SPACE_CONSOLE) {
                    SpaceConsole *con = (SpaceConsole*)sl;
                    ConsoleLine *cl;

                    for (cl=con->history.first; cl; cl=cl->next) {
                        /* 'len_alloc' is invalid on write, set from 'len' on read */
                        writestruct(wd, DATA, "ConsoleLine", 1, cl);
                        writedata(wd, DATA, cl->len+1, cl->line);
                    }
                    writestruct(wd, DATA, "SpaceConsole", 1, sl);

                }
                else if(sl->spacetype==SPACE_USERPREF) {
                    writestruct(wd, DATA, "SpaceUserPref", 1, sl);
                }
                else if(sl->spacetype==SPACE_CLIP) {
                    writestruct(wd, DATA, "SpaceClip", 1, sl);
                }

                sl= sl->next;
            }
        }

        sc= sc->id.next;
    }
}

static void write_libraries(WriteData *wd, Main *main)
{
    ListBase *lbarray[MAX_LIBARRAY];
    ID *id;
    int a, tot, foundone;

    for(; main; main= main->next) {

        a=tot= set_listbasepointers(main, lbarray);

        /* test: is lib being used */
        foundone= 0;
        while(tot--) {
            for(id= lbarray[tot]->first; id; id= id->next) {
                if(id->us>0 && (id->flag & LIB_EXTERN)) {
                    foundone= 1;
                    break;
                }
            }
            if(foundone) break;
        }

        if(foundone) {
            writestruct(wd, ID_LI, "Library", 1, main->curlib);

            while(a--) {
                for(id= lbarray[a]->first; id; id= id->next) {
                    if(id->us>0 && (id->flag & LIB_EXTERN)) {
                        writestruct(wd, ID_ID, "ID", 1, id);
                    }
                }
            }
        }
    }
}

static void write_bone(WriteData *wd, Bone* bone)
{
    Bone*   cbone;

    // PATCH for upward compatibility after 2.37+ armature recode
    bone->size[0]= bone->size[1]= bone->size[2]= 1.0f;
        
    // Write this bone
    writestruct(wd, DATA, "Bone", 1, bone);

    /* Write ID Properties -- and copy this comment EXACTLY for easy finding
     of library blocks that implement this.*/
    if (bone->prop)
        IDP_WriteProperty(bone->prop, wd);
    
    // Write Children
    cbone= bone->childbase.first;
    while(cbone) {
        write_bone(wd, cbone);
        cbone= cbone->next;
    }
}

static void write_armatures(WriteData *wd, ListBase *idbase)
{
    bArmature   *arm;
    Bone        *bone;

    arm=idbase->first;
    while (arm) {
        if (arm->id.us>0 || wd->current) {
            writestruct(wd, ID_AR, "bArmature", 1, arm);
            if (arm->id.properties) IDP_WriteProperty(arm->id.properties, wd);

            if (arm->adt) write_animdata(wd, arm->adt);

            /* Direct data */
            bone= arm->bonebase.first;
            while(bone) {
                write_bone(wd, bone);
                bone=bone->next;
            }
        }
        arm=arm->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_texts(WriteData *wd, ListBase *idbase)
{
    Text *text;
    TextLine *tmp;
    TextMarker *mrk;

    text= idbase->first;
    while(text) {
        if ( (text->flags & TXT_ISMEM) && (text->flags & TXT_ISEXT)) text->flags &= ~TXT_ISEXT;

        /* write LibData */
        writestruct(wd, ID_TXT, "Text", 1, text);
        if(text->name) writedata(wd, DATA, strlen(text->name)+1, text->name);
        if (text->id.properties) IDP_WriteProperty(text->id.properties, wd);

        if(!(text->flags & TXT_ISEXT)) {
            /* now write the text data, in two steps for optimization in the readfunction */
            tmp= text->lines.first;
            while (tmp) {
                writestruct(wd, DATA, "TextLine", 1, tmp);
                tmp= tmp->next;
            }

            tmp= text->lines.first;
            while (tmp) {
                writedata(wd, DATA, tmp->len+1, tmp->line);
                tmp= tmp->next;
            }

            /* write markers */
            mrk= text->markers.first;
            while (mrk) {
                writestruct(wd, DATA, "TextMarker", 1, mrk);
                mrk= mrk->next;
            }
        }


        text= text->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_speakers(WriteData *wd, ListBase *idbase)
{
    Speaker *spk;

    spk= idbase->first;
    while(spk) {
        if(spk->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_SPK, "Speaker", 1, spk);
            if (spk->id.properties) IDP_WriteProperty(spk->id.properties, wd);

            if (spk->adt) write_animdata(wd, spk->adt);
        }
        spk= spk->id.next;
    }
}

static void write_sounds(WriteData *wd, ListBase *idbase)
{
    bSound *sound;

    PackedFile * pf;

    sound= idbase->first;
    while(sound) {
        if(sound->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_SO, "bSound", 1, sound);
            if (sound->id.properties) IDP_WriteProperty(sound->id.properties, wd);

            if (sound->packedfile) {
                pf = sound->packedfile;
                writestruct(wd, DATA, "PackedFile", 1, pf);
                writedata(wd, DATA, pf->size, pf->data);
            }
        }
        sound= sound->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

static void write_groups(WriteData *wd, ListBase *idbase)
{
    Group *group;
    GroupObject *go;

    for(group= idbase->first; group; group= group->id.next) {
        if(group->id.us>0 || wd->current) {
            /* write LibData */
            writestruct(wd, ID_GR, "Group", 1, group);
            if (group->id.properties) IDP_WriteProperty(group->id.properties, wd);

            go= group->gobject.first;
            while(go) {
                writestruct(wd, DATA, "GroupObject", 1, go);
                go= go->next;
            }
        }
    }
}

static void write_nodetrees(WriteData *wd, ListBase *idbase)
{
    bNodeTree *ntree;
    
    for(ntree=idbase->first; ntree; ntree= ntree->id.next) {
        if (ntree->id.us>0 || wd->current) {
            writestruct(wd, ID_NT, "bNodeTree", 1, ntree);
            write_nodetree(wd, ntree);
            
            if (ntree->id.properties) IDP_WriteProperty(ntree->id.properties, wd);
            
            if (ntree->adt) write_animdata(wd, ntree->adt);
        }
    }
}

static void write_brushes(WriteData *wd, ListBase *idbase)
{
    Brush *brush;
    
    for(brush=idbase->first; brush; brush= brush->id.next) {
        if(brush->id.us>0 || wd->current) {
            writestruct(wd, ID_BR, "Brush", 1, brush);
            if (brush->id.properties) IDP_WriteProperty(brush->id.properties, wd);
            
            writestruct(wd, DATA, "MTex", 1, &brush->mtex);
            
            if(brush->curve)
                write_curvemapping(wd, brush->curve);
        }
    }
}

static void write_scripts(WriteData *wd, ListBase *idbase)
{
    Script *script;
    
    for(script=idbase->first; script; script= script->id.next) {
        if(script->id.us>0 || wd->current) {
            writestruct(wd, ID_SCRIPT, "Script", 1, script);
            if (script->id.properties) IDP_WriteProperty(script->id.properties, wd);
        }
    }
}

static void write_movieTracks(WriteData *wd, ListBase *tracks)
{
    MovieTrackingTrack *track;

    track= tracks->first;
    while(track) {
        writestruct(wd, DATA, "MovieTrackingTrack", 1, track);

        if(track->markers)
            writestruct(wd, DATA, "MovieTrackingMarker", track->markersnr, track->markers);

        track= track->next;
    }
}

static void write_movieReconstruction(WriteData *wd, MovieTrackingReconstruction *reconstruction)
{
    if(reconstruction->camnr)
        writestruct(wd, DATA, "MovieReconstructedCamera", reconstruction->camnr, reconstruction->cameras);
}

static void write_movieclips(WriteData *wd, ListBase *idbase)
{
    MovieClip *clip;

    clip= idbase->first;
    while(clip) {
        if(clip->id.us>0 || wd->current) {
            MovieTracking *tracking= &clip->tracking;
            MovieTrackingObject *object;
            writestruct(wd, ID_MC, "MovieClip", 1, clip);

            write_movieTracks(wd, &tracking->tracks);
            write_movieReconstruction(wd, &tracking->reconstruction);

            object= tracking->objects.first;
            while(object) {
                writestruct(wd, DATA, "MovieTrackingObject", 1, object);

                write_movieTracks(wd, &object->tracks);
                write_movieReconstruction(wd, &object->reconstruction);

                object= object->next;
            }
        }

        clip= clip->id.next;
    }

    /* flush helps the compression for undo-save */
    mywrite(wd, MYWRITE_FLUSH, 0);
}

/* context is usually defined by WM, two cases where no WM is available:
 * - for forward compatibility, curscreen has to be saved
 * - for undofile, curscene needs to be saved */
static void write_global(WriteData *wd, int fileflags, Main *mainvar)
{
    FileGlobal fg;
    bScreen *screen;
    char subvstr[8];
    
    /* prevent mem checkers from complaining */
    fg.pads= fg.pad= 0;
    memset(fg.filename, 0, sizeof(fg.filename));

    current_screen_compat(mainvar, &screen);

    /* XXX still remap G */
    fg.curscreen= screen;
    fg.curscene= screen->scene;
    fg.displaymode= G.displaymode;
    fg.winpos= G.winpos;

    /* prevent to save this, is not good convention, and feature with concerns... */
    fg.fileflags= (fileflags & ~(G_FILE_NO_UI|G_FILE_RELATIVE_REMAP|G_FILE_MESH_COMPAT));

    fg.globalf= G.f;
    BLI_strncpy(fg.filename, mainvar->name, sizeof(fg.filename));

    sprintf(subvstr, "%4d", BLENDER_SUBVERSION);
    memcpy(fg.subvstr, subvstr, 4);
    
    fg.subversion= BLENDER_SUBVERSION;
    fg.minversion= BLENDER_MINVERSION;
    fg.minsubversion= BLENDER_MINSUBVERSION;
#ifdef WITH_BUILDINFO
    {
        extern char build_rev[];
        fg.revision= atoi(build_rev);
    }
#else
    fg.revision= 0;
#endif
    writestruct(wd, GLOB, "FileGlobal", 1, &fg);
}

/* preview image, first 2 values are width and height
 * second are an RGBA image (unsigned char)
 * note, this uses 'TEST' since new types will segfault on file load for older blender versions.
 */
static void write_thumb(WriteData *wd, int *img)
{
    if(img)
        writedata(wd, TEST, (2 + img[0] * img[1]) * sizeof(int), img);
}

/* if MemFile * there's filesave to memory */
static int write_file_handle(Main *mainvar, int handle, MemFile *compare, MemFile *current, 
                             int write_user_block, int write_flags, int *thumb)
{
    BHead bhead;
    ListBase mainlist;
    char buf[16];
    WriteData *wd;

    blo_split_main(&mainlist, mainvar);

    wd= bgnwrite(handle, compare, current);

#ifdef USE_BMESH_SAVE_AS_COMPAT
    wd->use_mesh_compat = (write_flags & G_FILE_MESH_COMPAT) != 0;
#endif

    sprintf(buf, "BLENDER%c%c%.3d", (sizeof(void*)==8)?'-':'_', (ENDIAN_ORDER==B_ENDIAN)?'V':'v', BLENDER_VERSION);
    mywrite(wd, buf, 12);

    write_renderinfo(wd, mainvar);
    write_thumb(wd, thumb);
    write_global(wd, write_flags, mainvar);

    /* no UI save in undo */
    if(current==NULL) {
        write_windowmanagers(wd, &mainvar->wm);
        write_screens  (wd, &mainvar->screen);
    }
    write_movieclips (wd, &mainvar->movieclip);
    write_scenes   (wd, &mainvar->scene);
    write_curves   (wd, &mainvar->curve);
    write_mballs   (wd, &mainvar->mball);
    write_images   (wd, &mainvar->image);
    write_cameras  (wd, &mainvar->camera);
    write_lamps    (wd, &mainvar->lamp);
    write_lattices (wd, &mainvar->latt);
    write_vfonts   (wd, &mainvar->vfont);
    write_keys     (wd, &mainvar->key);
    write_worlds   (wd, &mainvar->world);
    write_texts    (wd, &mainvar->text);
    write_speakers (wd, &mainvar->speaker);
    write_sounds   (wd, &mainvar->sound);
    write_groups   (wd, &mainvar->group);
    write_armatures(wd, &mainvar->armature);
    write_actions  (wd, &mainvar->action);
    write_objects  (wd, &mainvar->object);
    write_materials(wd, &mainvar->mat);
    write_textures (wd, &mainvar->tex);
    write_meshs    (wd, &mainvar->mesh);
    write_particlesettings(wd, &mainvar->particle);
    write_nodetrees(wd, &mainvar->nodetree);
    write_brushes  (wd, &mainvar->brush);
    write_scripts  (wd, &mainvar->script);
    write_gpencils (wd, &mainvar->gpencil);
    write_libraries(wd,  mainvar->next);

    if (write_user_block) {
        write_userdef(wd);
    }
                            
    /* dna as last, because (to be implemented) test for which structs are written */
    writedata(wd, DNA1, wd->sdna->datalen, wd->sdna->data);

    /* end of file */
    memset(&bhead, 0, sizeof(BHead));
    bhead.code= ENDB;
    mywrite(wd, &bhead, sizeof(BHead));

    blo_join_main(&mainlist);

    return endwrite(wd);
}

/* do reverse file history: .blend1 -> .blend2, .blend -> .blend1 */
/* return: success(0), failure(1) */
static int do_history(const char *name, ReportList *reports)
{
    char tempname1[FILE_MAX], tempname2[FILE_MAX];
    int hisnr= U.versions;
    
    if(U.versions==0) return 0;
    if(strlen(name)<2) {
        BKE_report(reports, RPT_ERROR, "Unable to make version backup: filename too short");
        return 1;
    }
        
    while(hisnr > 1) {
        BLI_snprintf(tempname1, sizeof(tempname1), "%s%d", name, hisnr-1);
        BLI_snprintf(tempname2, sizeof(tempname2), "%s%d", name, hisnr);
    
        if(BLI_rename(tempname1, tempname2)) {
            BKE_report(reports, RPT_ERROR, "Unable to make version backup");
            return 1;
        }   
        hisnr--;
    }

    /* is needed when hisnr==1 */
    BLI_snprintf(tempname1, sizeof(tempname1), "%s%d", name, hisnr);

    if(BLI_rename(name, tempname1)) {
        BKE_report(reports, RPT_ERROR, "Unable to make version backup");
        return 1;
    }

    return 0;
}

/* return: success (1) */
int BLO_write_file(Main *mainvar, const char *filepath, int write_flags, ReportList *reports, int *thumb)
{
    char userfilename[FILE_MAX];
    char tempname[FILE_MAX+1];
    int file, err, write_user_block;

    /* open temporary file, so we preserve the original in case we crash */
    BLI_snprintf(tempname, sizeof(tempname), "%s@", filepath);

    file = open(tempname,O_BINARY+O_WRONLY+O_CREAT+O_TRUNC, 0666);
    if(file == -1) {
        BKE_reportf(reports, RPT_ERROR, "Can't open file %s for writing: %s.", tempname, strerror(errno));
        return 0;
    }

    /* remapping of relative paths to new file location */
    if(write_flags & G_FILE_RELATIVE_REMAP) {
        char dir1[FILE_MAX];
        char dir2[FILE_MAX];
        BLI_split_dir_part(filepath, dir1, sizeof(dir1));
        BLI_split_dir_part(mainvar->name, dir2, sizeof(dir2));

        /* just incase there is some subtle difference */
        BLI_cleanup_dir(mainvar->name, dir1);
        BLI_cleanup_dir(mainvar->name, dir2);

        if(BLI_path_cmp(dir1, dir2)==0) {
            write_flags &= ~G_FILE_RELATIVE_REMAP;
        }
        else {
            if(G.relbase_valid) {
                /* blend may not have been saved before. Tn this case
                 * we should not have any relative paths, but if there
                 * is somehow, an invalid or empty G.main->name it will
                 * print an error, dont try make the absolute in this case. */
                makeFilesAbsolute(mainvar, G.main->name, NULL);
            }
        }
    }

    BLI_make_file_string(G.main->name, userfilename, BLI_get_folder_create(BLENDER_USER_CONFIG, NULL), BLENDER_STARTUP_FILE);
    write_user_block= (BLI_path_cmp(filepath, userfilename) == 0);

    if(write_flags & G_FILE_RELATIVE_REMAP)
        makeFilesRelative(mainvar, filepath, NULL); /* note, making relative to something OTHER then G.main->name */

    /* actual file writing */
    err= write_file_handle(mainvar, file, NULL,NULL, write_user_block, write_flags, thumb);
    close(file);

    if (err) {
        BKE_report(reports, RPT_ERROR, strerror(errno));
        remove(tempname);

        return 0;
    }

    /* file save to temporary file was successful */
    /* now do reverse file history (move .blend1 -> .blend2, .blend -> .blend1) */
    if (write_flags & G_FILE_HISTORY) { 
        int err_hist = do_history(filepath, reports);
        if (err_hist) {
            BKE_report(reports, RPT_ERROR, "Version backup failed. File saved with @");
            return 0;
        }
    }

    if(write_flags & G_FILE_COMPRESS) {
        /* compressed files have the same ending as regular files... only from 2.4!!! */
        char gzname[FILE_MAX+4];
        int ret;

        /* first write compressed to separate @.gz */
        BLI_snprintf(gzname, sizeof(gzname), "%s@.gz", filepath);
        ret = BLI_file_gzip(tempname, gzname);
        
        if(0==ret) {
            /* now rename to real file name, and delete temp @ file too */
            if(BLI_rename(gzname, filepath) != 0) {
                BKE_report(reports, RPT_ERROR, "Can't change old file. File saved with @.");
                return 0;
            }

            BLI_delete(tempname, 0, 0);
        }
        else if(-1==ret) {
            BKE_report(reports, RPT_ERROR, "Failed opening .gz file.");
            return 0;
        }
        else if(-2==ret) {
            BKE_report(reports, RPT_ERROR, "Failed opening .blend file for compression.");
            return 0;
        }
    }
    else if(BLI_rename(tempname, filepath) != 0) {
        BKE_report(reports, RPT_ERROR, "Can't change old file. File saved with @");
        return 0;
    }

    return 1;
}

/* return: success (1) */
int BLO_write_file_mem(Main *mainvar, MemFile *compare, MemFile *current, int write_flags)
{
    int err;

    err= write_file_handle(mainvar, 0, compare, current, 0, write_flags, NULL);
    
    if(err==0) return 1;
    return 0;
}