2823a4c8 |
1 | /* gameplaySP |
2 | * |
3 | * Copyright (C) 2006 Exophase <exophase@gmail.com> |
4 | * Copyright (C) 2006 SiberianSTAR |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as |
8 | * published by the Free Software Foundation; either version 2 of |
9 | * the License, or (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | */ |
20 | |
2823a4c8 |
21 | #include "common.h" |
8b6232a6 |
22 | #include <zlib.h> |
2823a4c8 |
23 | |
24 | #define ZIP_BUFFER_SIZE (128 * 1024) |
25 | |
26 | struct SZIPFileDataDescriptor |
27 | { |
28 | s32 CRC32; |
29 | s32 CompressedSize; |
30 | s32 UncompressedSize; |
31 | } __attribute__((packed)); |
32 | |
33 | struct SZIPFileHeader |
34 | { |
35 | char Sig[4]; // EDIT: Used to be s32 Sig; |
36 | s16 VersionToExtract; |
37 | s16 GeneralBitFlag; |
38 | s16 CompressionMethod; |
39 | s16 LastModFileTime; |
40 | s16 LastModFileDate; |
41 | struct SZIPFileDataDescriptor DataDescriptor; |
42 | s16 FilenameLength; |
43 | s16 ExtraFieldLength; |
44 | } __attribute__((packed)); |
45 | |
46 | u32 load_file_zip(char *filename) |
47 | { |
48 | struct SZIPFileHeader data; |
49 | u8 tmp[1024]; |
50 | s32 retval = -1; |
51 | u8 *buffer = NULL; |
52 | u8 *cbuffer; |
53 | u8 *ext; |
54 | |
55 | file_open(fd, filename, read); |
56 | |
57 | if(!file_check_valid(fd)) |
58 | return -1; |
59 | |
60 | #if 0 // EDIT: Why this while(1) is used is unknown and can cause a crash. |
61 | while(1) |
62 | #endif |
63 | { |
64 | file_read(fd, &data, sizeof(struct SZIPFileHeader)); |
65 | |
66 | // EDIT: Check if this is a zip file without worrying about endian |
67 | // It checks for the following: 0x50 0x4B 0x03 0x04 (PK..) |
68 | // Used to be: if(data.Sig != 0x04034b50) break; |
69 | if( data.Sig[0] != 0x50 || data.Sig[1] != 0x4B || |
70 | data.Sig[2] != 0x03 || data.Sig[3] != 0x04 ) |
71 | { |
72 | goto outcode; |
73 | } |
74 | |
75 | file_read(fd, tmp, data.FilenameLength); |
76 | tmp[data.FilenameLength] = 0; // end string |
77 | |
78 | if(data.ExtraFieldLength) |
79 | file_seek(fd, data.ExtraFieldLength, SEEK_CUR); |
80 | |
81 | if(data.GeneralBitFlag & 0x0008) |
82 | { |
83 | file_read(fd, &data.DataDescriptor, |
84 | sizeof(struct SZIPFileDataDescriptor)); |
85 | } |
86 | |
87 | ext = strrchr(tmp, '.') + 1; |
88 | |
89 | // file is too big |
90 | if(data.DataDescriptor.UncompressedSize > gamepak_ram_buffer_size) |
91 | goto outcode; |
92 | |
93 | if(!strcasecmp(ext, "bin") || !strcasecmp(ext, "gba")) |
94 | { |
95 | buffer = gamepak_rom; |
96 | |
97 | // ok, found |
98 | switch(data.CompressionMethod) |
99 | { |
100 | case 0: |
101 | retval = data.DataDescriptor.UncompressedSize; |
102 | file_read(fd, buffer, retval); |
103 | |
104 | goto outcode; |
105 | |
106 | case 8: |
107 | { |
108 | z_stream stream; |
109 | s32 err; |
110 | |
111 | cbuffer = malloc(ZIP_BUFFER_SIZE); |
112 | |
113 | stream.next_in = (Bytef*)cbuffer; |
114 | stream.avail_in = (u32)ZIP_BUFFER_SIZE; |
115 | |
116 | stream.next_out = (Bytef*)buffer; |
117 | |
118 | // EDIT: Now uses proper conversion of data types for retval. |
119 | retval = (u32)data.DataDescriptor.UncompressedSize; |
120 | stream.avail_out = data.DataDescriptor.UncompressedSize; |
121 | |
122 | stream.zalloc = (alloc_func)0; |
123 | stream.zfree = (free_func)0; |
124 | |
125 | err = inflateInit2(&stream, -MAX_WBITS); |
126 | |
127 | file_read(fd, cbuffer, ZIP_BUFFER_SIZE); |
128 | |
129 | if(err == Z_OK) |
130 | { |
131 | while(err != Z_STREAM_END) |
132 | { |
133 | err = inflate(&stream, Z_SYNC_FLUSH); |
134 | if(err == Z_BUF_ERROR) |
135 | { |
136 | stream.avail_in = ZIP_BUFFER_SIZE; |
137 | stream.next_in = (Bytef*)cbuffer; |
138 | file_read(fd, cbuffer, ZIP_BUFFER_SIZE); |
139 | } |
140 | } |
141 | err = Z_OK; |
142 | inflateEnd(&stream); |
143 | } |
144 | free(cbuffer); |
145 | goto outcode; |
146 | } |
147 | } |
148 | } |
149 | } |
150 | |
151 | outcode: |
152 | file_close(fd); |
153 | |
154 | return retval; |
155 | } |