156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/* gameplaySP
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*
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* Copyright (C) 2006 Exophase <exophase@gmail.com>
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* Copyright (C) 2006 SiberianSTAR
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zlib.h>
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#include "common.h"
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#define ZIP_BUFFER_SIZE (128 * 1024)
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struct SZIPFileDataDescriptor
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{
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s32 CRC32;
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s32 CompressedSize;
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s32 UncompressedSize;
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} __attribute__((packed));
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struct SZIPFileHeader
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{
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char Sig[4]; // EDIT: Used to be s32 Sig;
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s16 VersionToExtract;
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s16 GeneralBitFlag;
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s16 CompressionMethod;
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s16 LastModFileTime;
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s16 LastModFileDate;
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struct SZIPFileDataDescriptor DataDescriptor;
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s16 FilenameLength;
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s16 ExtraFieldLength;
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} __attribute__((packed));
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u32 load_file_zip(char *filename)
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{
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struct SZIPFileHeader data;
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u8 tmp[1024];
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s32 retval = -1;
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u8 *buffer = NULL;
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u8 *cbuffer;
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u8 *ext;
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file_open(fd, filename, read);
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if(!file_check_valid(fd))
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return -1;
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#if 0 // EDIT: Why this while(1) is used is unknown and can cause a crash.
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while(1)
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#endif
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{
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file_read(fd, &data, sizeof(struct SZIPFileHeader));
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// EDIT: Check if this is a zip file without worrying about endian
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// It checks for the following: 0x50 0x4B 0x03 0x04 (PK..)
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// Used to be: if(data.Sig != 0x04034b50) break;
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if( data.Sig[0] != 0x50 || data.Sig[1] != 0x4B ||
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data.Sig[2] != 0x03 || data.Sig[3] != 0x04 )
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{
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goto outcode;
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}
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file_read(fd, tmp, data.FilenameLength);
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tmp[data.FilenameLength] = 0; // end string
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if(data.ExtraFieldLength)
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file_seek(fd, data.ExtraFieldLength, SEEK_CUR);
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if(data.GeneralBitFlag & 0x0008)
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{
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file_read(fd, &data.DataDescriptor,
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sizeof(struct SZIPFileDataDescriptor));
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}
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ext = strrchr(tmp, '.') + 1;
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// file is too big
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if(data.DataDescriptor.UncompressedSize > gamepak_ram_buffer_size)
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goto outcode;
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if(!strcasecmp(ext, "bin") || !strcasecmp(ext, "gba"))
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{
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buffer = gamepak_rom;
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// ok, found
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switch(data.CompressionMethod)
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{
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case 0:
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retval = data.DataDescriptor.UncompressedSize;
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file_read(fd, buffer, retval);
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goto outcode;
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case 8:
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{
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z_stream stream;
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s32 err;
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cbuffer = malloc(ZIP_BUFFER_SIZE);
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stream.next_in = (Bytef*)cbuffer;
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stream.avail_in = (u32)ZIP_BUFFER_SIZE;
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stream.next_out = (Bytef*)buffer;
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// EDIT: Now uses proper conversion of data types for retval.
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retval = (u32)data.DataDescriptor.UncompressedSize;
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stream.avail_out = data.DataDescriptor.UncompressedSize;
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stream.zalloc = (alloc_func)0;
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stream.zfree = (free_func)0;
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err = inflateInit2(&stream, -MAX_WBITS);
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file_read(fd, cbuffer, ZIP_BUFFER_SIZE);
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if(err == Z_OK)
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{
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while(err != Z_STREAM_END)
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{
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err = inflate(&stream, Z_SYNC_FLUSH);
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if(err == Z_BUF_ERROR)
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{
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stream.avail_in = ZIP_BUFFER_SIZE;
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stream.next_in = (Bytef*)cbuffer;
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file_read(fd, cbuffer, ZIP_BUFFER_SIZE);
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}
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}
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err = Z_OK;
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inflateEnd(&stream);
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}
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free(cbuffer);
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goto outcode;
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}
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}
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}
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}
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outcode:
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file_close(fd);
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return retval;
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}
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