Stream.cpp

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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.
 *
 * Contributors: Amorilia (amorilia@users.sourceforge.net)
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <Stream.h>

#include <stdio.h>  // printf
#include <string.h> // memcpy

unsigned int Stream::seek(unsigned int p)
{
    if (p > size) {
        printf("DDS: trying to seek beyond end of stream (corrupt file?)");
    }
    else {
        pos = p;
    }

    return pos;
}

unsigned int mem_read(Stream & mem, unsigned long long & i)
{
    if (mem.pos + 8 > mem.size) {
        printf("DDS: trying to read beyond end of stream (corrupt file?)");
        return(0);
    };
    memcpy(&i, mem.mem + mem.pos, 8); // @@ todo: make sure little endian
    mem.pos += 8;
    return(8);
}

unsigned int mem_read(Stream & mem, unsigned int & i)
{
    if (mem.pos + 4 > mem.size) {
        printf("DDS: trying to read beyond end of stream (corrupt file?)");
        return(0);
    };
    memcpy(&i, mem.mem + mem.pos, 4); // @@ todo: make sure little endian
    mem.pos += 4;
    return(4);
}

unsigned int mem_read(Stream & mem, unsigned short & i)
{
    if (mem.pos + 2 > mem.size) {
        printf("DDS: trying to read beyond end of stream (corrupt file?)");
        return(0);
    };
    memcpy(&i, mem.mem + mem.pos, 2); // @@ todo: make sure little endian
    mem.pos += 2;
    return(2);
}

unsigned int mem_read(Stream & mem, unsigned char & i)
{
    if (mem.pos + 1 > mem.size) {
        printf("DDS: trying to read beyond end of stream (corrupt file?)");
        return(0);
    };
    i = (mem.mem + mem.pos)[0];
    mem.pos += 1;
    return(1);
}

unsigned int mem_read(Stream & mem, unsigned char *i, unsigned int cnt)
{
    if (mem.pos + cnt > mem.size) {
        printf("DDS: trying to read beyond end of stream (corrupt file?)");
        return(0);
    };
    memcpy(i, mem.mem + mem.pos, cnt);
    mem.pos += cnt;
    return(cnt);
}