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executable file 156 lines (127 sloc) 3.99 kB
/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
* Copyright (C) 2006 SiberianSTAR
*
* 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
*/
#include <zlib.h>
#include "common.h"
#define ZIP_BUFFER_SIZE (128 * 1024)
struct SZIPFileDataDescriptor
{
s32 CRC32;
s32 CompressedSize;
s32 UncompressedSize;
} __attribute__((packed));
struct SZIPFileHeader
{
char Sig[4]; // EDIT: Used to be s32 Sig;
s16 VersionToExtract;
s16 GeneralBitFlag;
s16 CompressionMethod;
s16 LastModFileTime;
s16 LastModFileDate;
struct SZIPFileDataDescriptor DataDescriptor;
s16 FilenameLength;
s16 ExtraFieldLength;
} __attribute__((packed));
u32 load_file_zip(char *filename)
{
struct SZIPFileHeader data;
u8 tmp[1024];
s32 retval = -1;
u8 *buffer = NULL;
u8 *cbuffer;
u8 *ext;
file_open(fd, filename, read);
if(!file_check_valid(fd))
return -1;
#if 0 // EDIT: Why this while(1) is used is unknown and can cause a crash.
while(1)
#endif
{
file_read(fd, &data, sizeof(struct SZIPFileHeader));
// EDIT: Check if this is a zip file without worrying about endian
// It checks for the following: 0x50 0x4B 0x03 0x04 (PK..)
// Used to be: if(data.Sig != 0x04034b50) break;
if( data.Sig[0] != 0x50 || data.Sig[1] != 0x4B ||
data.Sig[2] != 0x03 || data.Sig[3] != 0x04 )
{
goto outcode;
}
file_read(fd, tmp, data.FilenameLength);
tmp[data.FilenameLength] = 0; // end string
if(data.ExtraFieldLength)
file_seek(fd, data.ExtraFieldLength, SEEK_CUR);
if(data.GeneralBitFlag & 0x0008)
{
file_read(fd, &data.DataDescriptor,
sizeof(struct SZIPFileDataDescriptor));
}
ext = strrchr(tmp, '.') + 1;
// file is too big
if(data.DataDescriptor.UncompressedSize > gamepak_ram_buffer_size)
goto outcode;
if(!strcasecmp(ext, "bin") || !strcasecmp(ext, "gba"))
{
buffer = gamepak_rom;
// ok, found
switch(data.CompressionMethod)
{
case 0:
retval = data.DataDescriptor.UncompressedSize;
file_read(fd, buffer, retval);
goto outcode;
case 8:
{
z_stream stream;
s32 err;
cbuffer = malloc(ZIP_BUFFER_SIZE);
stream.next_in = (Bytef*)cbuffer;
stream.avail_in = (u32)ZIP_BUFFER_SIZE;
stream.next_out = (Bytef*)buffer;
// EDIT: Now uses proper conversion of data types for retval.
retval = (u32)data.DataDescriptor.UncompressedSize;
stream.avail_out = data.DataDescriptor.UncompressedSize;
stream.zalloc = (alloc_func)0;
stream.zfree = (free_func)0;
err = inflateInit2(&stream, -MAX_WBITS);
file_read(fd, cbuffer, ZIP_BUFFER_SIZE);
if(err == Z_OK)
{
while(err != Z_STREAM_END)
{
err = inflate(&stream, Z_SYNC_FLUSH);
if(err == Z_BUF_ERROR)
{
stream.avail_in = ZIP_BUFFER_SIZE;
stream.next_in = (Bytef*)cbuffer;
file_read(fd, cbuffer, ZIP_BUFFER_SIZE);
}
}
err = Z_OK;
inflateEnd(&stream);
}
free(cbuffer);
goto outcode;
}
}
}
}
outcode:
file_close(fd);
return retval;
}
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