]> git.saurik.com Git - wxWidgets.git/blob - src/zlib/zutil.c
Added missing files to listing
[wxWidgets.git] / src / zlib / zutil.c
1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* @(#) $Id$ */
7
8 #include "zutil.h"
9
10 struct internal_state {int dummy;}; /* for buggy compilers */
11
12 #ifndef STDC
13 extern void exit OF((int));
14 #endif
15
16 const char *z_errmsg[10] = {
17 "need dictionary", /* Z_NEED_DICT 2 */
18 "stream end", /* Z_STREAM_END 1 */
19 "", /* Z_OK 0 */
20 "file error", /* Z_ERRNO (-1) */
21 "stream error", /* Z_STREAM_ERROR (-2) */
22 "data error", /* Z_DATA_ERROR (-3) */
23 "insufficient memory", /* Z_MEM_ERROR (-4) */
24 "buffer error", /* Z_BUF_ERROR (-5) */
25 "incompatible version",/* Z_VERSION_ERROR (-6) */
26 ""};
27
28
29 const char * ZEXPORT zlibVersion()
30 {
31 return ZLIB_VERSION;
32 }
33
34 #ifdef __WXDEBUG__
35
36 # ifndef verbose
37 # define verbose 0
38 # endif
39 int z_verbose = verbose;
40
41 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
42 void z_error (char* m)
43 #else
44 void z_error (m)
45 char *m;
46 #endif
47 {
48 fprintf(stderr, "%s\n", m);
49 exit(1);
50 }
51 #endif
52
53 /* exported to allow conversion of error code to string for compress() and
54 * uncompress()
55 */
56 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
57 const char* ZEXPORT zError(int err)
58 #else
59 const char * ZEXPORT zError(err)
60 int err;
61 #endif
62 {
63 return ERR_MSG(err);
64 }
65
66
67 #ifndef HAVE_MEMCPY
68
69 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
70 void zmemcpy(Bytef* dest, Bytef* source, Uint len)
71 #else
72 void zmemcpy(dest, source, len)
73 Bytef* dest;
74 Bytef* source;
75 uInt len;
76 #endif
77 {
78 if (len == 0) return;
79 do {
80 *dest++ = *source++; /* ??? to be unrolled */
81 } while (--len != 0);
82 }
83
84 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
85 int zmemcmp(Bytef* s1, Bytef* s2, int len)
86 #else
87 int zmemcmp(s1, s2, len)
88 Bytef* s1;
89 Bytef* s2;
90 uInt len;
91 #endif
92 {
93 uInt j;
94
95 for (j = 0; j < len; j++) {
96 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
97 }
98 return 0;
99 }
100
101 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
102 void zmemzero(Bytef* dest, uInt len)
103 #else
104 void zmemzero(dest, len)
105 Bytef* dest;
106 uInt len;
107 #endif
108 {
109 if (len == 0) return;
110 do {
111 *dest++ = 0; /* ??? to be unrolled */
112 } while (--len != 0);
113 }
114 #endif
115
116 #ifdef __TURBOC__
117 #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
118 /* Small and medium model in Turbo C are for now limited to near allocation
119 * with reduced MAX_WBITS and MAX_MEM_LEVEL
120 */
121 # define MY_ZCALLOC
122
123 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
124 * and farmalloc(64K) returns a pointer with an offset of 8, so we
125 * must fix the pointer. Warning: the pointer must be put back to its
126 * original form in order to free it, use zcfree().
127 */
128
129 #define MAX_PTR 10
130 /* 10*64K = 640K */
131
132 local int next_ptr = 0;
133
134 typedef struct ptr_table_s {
135 voidpf org_ptr;
136 voidpf new_ptr;
137 } ptr_table;
138
139 local ptr_table table[MAX_PTR];
140 /* This table is used to remember the original form of pointers
141 * to large buffers (64K). Such pointers are normalized with a zero offset.
142 * Since MSDOS is not a preemptive multitasking OS, this table is not
143 * protected from concurrent access. This hack doesn't work anyway on
144 * a protected system like OS/2. Use Microsoft C instead.
145 */
146
147 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
148 {
149 voidpf buf = opaque; /* just to make some compilers happy */
150 ulg bsize = (ulg)items*size;
151
152 /* If we allocate less than 65520 bytes, we assume that farmalloc
153 * will return a usable pointer which doesn't have to be normalized.
154 */
155 if (bsize < 65520L) {
156 buf = farmalloc(bsize);
157 if (*(ush*)&buf != 0) return buf;
158 } else {
159 buf = farmalloc(bsize + 16L);
160 }
161 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
162 table[next_ptr].org_ptr = buf;
163
164 /* Normalize the pointer to seg:0 */
165 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
166 *(ush*)&buf = 0;
167 table[next_ptr++].new_ptr = buf;
168 return buf;
169 }
170
171 void zcfree (voidpf opaque, voidpf ptr)
172 {
173 int n;
174 if (*(ush*)&ptr != 0) { /* object < 64K */
175 farfree(ptr);
176 return;
177 }
178 /* Find the original pointer */
179 for (n = 0; n < next_ptr; n++) {
180 if (ptr != table[n].new_ptr) continue;
181
182 farfree(table[n].org_ptr);
183 while (++n < next_ptr) {
184 table[n-1] = table[n];
185 }
186 next_ptr--;
187 return;
188 }
189 ptr = opaque; /* just to make some compilers happy */
190 Assert(0, "zcfree: ptr not found");
191 }
192 #endif
193 #endif /* __TURBOC__ */
194
195
196 #if defined(M_I86) && !defined(__32BIT__)
197 /* Microsoft C in 16-bit mode */
198
199 # define MY_ZCALLOC
200
201 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
202 # define _halloc halloc
203 # define _hfree hfree
204 #endif
205
206 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
207 {
208 if (opaque) opaque = 0; /* to make compiler happy */
209 return _halloc((long)items, size);
210 }
211
212 void zcfree (voidpf opaque, voidpf ptr)
213 {
214 if (opaque) opaque = 0; /* to make compiler happy */
215 _hfree(ptr);
216 }
217
218 #endif /* MSC */
219
220
221 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
222
223 #ifndef STDC
224 extern voidp calloc OF((uInt items, uInt size));
225 extern void free OF((voidpf ptr));
226 #endif
227
228 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
229 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
230 #else
231 voidpf zcalloc (opaque, items, size)
232 voidpf opaque;
233 unsigned items;
234 unsigned size;
235 #endif
236 {
237 if (opaque) items += size - size; /* make compiler happy */
238 return (voidpf)calloc(items, size);
239 }
240
241 #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */
242 void zcfree(voidpf opaque, voidpf ptr)
243 #else
244 void zcfree (opaque, ptr)
245 voidpf opaque;
246 voidpf ptr;
247 #endif
248 {
249 free(ptr);
250 if (opaque) return; /* make compiler happy */
251 }
252
253 #endif /* MY_ZCALLOC */