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1 | /* ioapi.c -- IO base function header for compress/uncompress .zip |
2 | files using zlib + zip or unzip API |
3 | |
4 | Version 1.01e, February 12th, 2005 |
5 | |
6 | Copyright (C) 1998-2005 Gilles Vollant |
7 | */ |
8 | |
9 | #include <stdio.h> |
10 | #include <stdlib.h> |
11 | #include <string.h> |
12 | |
13 | #include "zlib.h" |
14 | #include "ioapi.h" |
15 | |
16 | |
17 | |
18 | /* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */ |
19 | |
20 | #ifndef SEEK_CUR |
21 | #define SEEK_CUR 1 |
22 | #endif |
23 | |
24 | #ifndef SEEK_END |
25 | #define SEEK_END 2 |
26 | #endif |
27 | |
28 | #ifndef SEEK_SET |
29 | #define SEEK_SET 0 |
30 | #endif |
31 | |
32 | voidpf ZCALLBACK fopen_file_func OF(( |
33 | voidpf opaque, |
34 | const char* filename, |
35 | int mode)); |
36 | |
37 | uLong ZCALLBACK fread_file_func OF(( |
38 | voidpf opaque, |
39 | voidpf stream, |
40 | void* buf, |
41 | uLong size)); |
42 | |
43 | uLong ZCALLBACK fwrite_file_func OF(( |
44 | voidpf opaque, |
45 | voidpf stream, |
46 | const void* buf, |
47 | uLong size)); |
48 | |
49 | long ZCALLBACK ftell_file_func OF(( |
50 | voidpf opaque, |
51 | voidpf stream)); |
52 | |
53 | long ZCALLBACK fseek_file_func OF(( |
54 | voidpf opaque, |
55 | voidpf stream, |
56 | uLong offset, |
57 | int origin)); |
58 | |
59 | int ZCALLBACK fclose_file_func OF(( |
60 | voidpf opaque, |
61 | voidpf stream)); |
62 | |
63 | int ZCALLBACK ferror_file_func OF(( |
64 | voidpf opaque, |
65 | voidpf stream)); |
66 | |
67 | |
68 | voidpf ZCALLBACK fopen_file_func (opaque, filename, mode) |
69 | voidpf opaque; |
70 | const char* filename; |
71 | int mode; |
72 | { |
73 | FILE* file = NULL; |
74 | const char* mode_fopen = NULL; |
75 | if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ) |
76 | mode_fopen = "rb"; |
77 | else |
78 | if (mode & ZLIB_FILEFUNC_MODE_EXISTING) |
79 | mode_fopen = "r+b"; |
80 | else |
81 | if (mode & ZLIB_FILEFUNC_MODE_CREATE) |
82 | mode_fopen = "wb"; |
83 | |
84 | if ((filename!=NULL) && (mode_fopen != NULL)) |
85 | file = fopen(filename, mode_fopen); |
86 | return file; |
87 | } |
88 | |
89 | |
90 | uLong ZCALLBACK fread_file_func (opaque, stream, buf, size) |
91 | voidpf opaque; |
92 | voidpf stream; |
93 | void* buf; |
94 | uLong size; |
95 | { |
96 | uLong ret; |
97 | ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream); |
98 | return ret; |
99 | } |
100 | |
101 | |
102 | uLong ZCALLBACK fwrite_file_func (opaque, stream, buf, size) |
103 | voidpf opaque; |
104 | voidpf stream; |
105 | const void* buf; |
106 | uLong size; |
107 | { |
108 | uLong ret; |
109 | ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream); |
110 | return ret; |
111 | } |
112 | |
113 | long ZCALLBACK ftell_file_func (opaque, stream) |
114 | voidpf opaque; |
115 | voidpf stream; |
116 | { |
117 | long ret; |
118 | ret = ftell((FILE *)stream); |
119 | return ret; |
120 | } |
121 | |
122 | long ZCALLBACK fseek_file_func (opaque, stream, offset, origin) |
123 | voidpf opaque; |
124 | voidpf stream; |
125 | uLong offset; |
126 | int origin; |
127 | { |
128 | int fseek_origin=0; |
129 | long ret; |
130 | switch (origin) |
131 | { |
132 | case ZLIB_FILEFUNC_SEEK_CUR : |
133 | fseek_origin = SEEK_CUR; |
134 | break; |
135 | case ZLIB_FILEFUNC_SEEK_END : |
136 | fseek_origin = SEEK_END; |
137 | break; |
138 | case ZLIB_FILEFUNC_SEEK_SET : |
139 | fseek_origin = SEEK_SET; |
140 | break; |
141 | default: return -1; |
142 | } |
143 | ret = 0; |
144 | fseek((FILE *)stream, offset, fseek_origin); |
145 | return ret; |
146 | } |
147 | |
148 | int ZCALLBACK fclose_file_func (opaque, stream) |
149 | voidpf opaque; |
150 | voidpf stream; |
151 | { |
152 | int ret; |
153 | ret = fclose((FILE *)stream); |
154 | return ret; |
155 | } |
156 | |
157 | int ZCALLBACK ferror_file_func (opaque, stream) |
158 | voidpf opaque; |
159 | voidpf stream; |
160 | { |
161 | int ret; |
162 | ret = ferror((FILE *)stream); |
163 | return ret; |
164 | } |
165 | |
166 | void fill_fopen_filefunc (pzlib_filefunc_def) |
167 | zlib_filefunc_def* pzlib_filefunc_def; |
168 | { |
169 | pzlib_filefunc_def->zopen_file = fopen_file_func; |
170 | pzlib_filefunc_def->zread_file = fread_file_func; |
171 | pzlib_filefunc_def->zwrite_file = fwrite_file_func; |
172 | pzlib_filefunc_def->ztell_file = ftell_file_func; |
173 | pzlib_filefunc_def->zseek_file = fseek_file_func; |
174 | pzlib_filefunc_def->zclose_file = fclose_file_func; |
175 | pzlib_filefunc_def->zerror_file = ferror_file_func; |
176 | pzlib_filefunc_def->opaque = NULL; |
177 | } |