1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005 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 #ifndef NO_DUMMY_DECL
11 struct internal_state {int dummy;}; /* for buggy compilers */
12 #endif
13
14 const char * const z_errmsg[10] = {
15 "need dictionary", /* Z_NEED_DICT 2 */
16 "stream end", /* Z_STREAM_END 1 */
17 "", /* Z_OK 0 */
18 "file error", /* Z_ERRNO (-1) */
19 "stream error", /* Z_STREAM_ERROR (-2) */
20 "data error", /* Z_DATA_ERROR (-3) */
21 "insufficient memory", /* Z_MEM_ERROR (-4) */
22 "buffer error", /* Z_BUF_ERROR (-5) */
23 "incompatible version",/* Z_VERSION_ERROR (-6) */
24 ""};
25
26
zlibVersion()27 const char * ZEXPORT zlibVersion()
28 {
29 return ZLIB_VERSION;
30 }
31
zlibCompileFlags()32 uLong ZEXPORT zlibCompileFlags()
33 {
34 uLong flags;
35
36 flags = 0;
37 switch (sizeof(uInt)) {
38 case 2: break;
39 case 4: flags += 1; break;
40 case 8: flags += 2; break;
41 default: flags += 3;
42 }
43 switch (sizeof(uLong)) {
44 case 2: break;
45 case 4: flags += 1 << 2; break;
46 case 8: flags += 2 << 2; break;
47 default: flags += 3 << 2;
48 }
49 switch (sizeof(voidpf)) {
50 case 2: break;
51 case 4: flags += 1 << 4; break;
52 case 8: flags += 2 << 4; break;
53 default: flags += 3 << 4;
54 }
55 switch (sizeof(z_off_t)) {
56 case 2: break;
57 case 4: flags += 1 << 6; break;
58 case 8: flags += 2 << 6; break;
59 default: flags += 3 << 6;
60 }
61 #ifdef DEBUG
62 flags += 1 << 8;
63 #endif
64 #if defined(ASMV) || defined(ASMINF)
65 flags += 1 << 9;
66 #endif
67 #ifdef ZLIB_WINAPI
68 flags += 1 << 10;
69 #endif
70 #ifdef BUILDFIXED
71 flags += 1 << 12;
72 #endif
73 #ifdef DYNAMIC_CRC_TABLE
74 flags += 1 << 13;
75 #endif
76 #ifdef NO_GZCOMPRESS
77 flags += 1L << 16;
78 #endif
79 #ifdef NO_GZIP
80 flags += 1L << 17;
81 #endif
82 #ifdef PKZIP_BUG_WORKAROUND
83 flags += 1L << 20;
84 #endif
85 #ifdef FASTEST
86 flags += 1L << 21;
87 #endif
88 #ifdef STDC
89 # ifdef NO_vsnprintf
90 flags += 1L << 25;
91 # ifdef HAS_vsprintf_void
92 flags += 1L << 26;
93 # endif
94 # else
95 # ifdef HAS_vsnprintf_void
96 flags += 1L << 26;
97 # endif
98 # endif
99 #else
100 flags += 1L << 24;
101 # ifdef NO_snprintf
102 flags += 1L << 25;
103 # ifdef HAS_sprintf_void
104 flags += 1L << 26;
105 # endif
106 # else
107 # ifdef HAS_snprintf_void
108 flags += 1L << 26;
109 # endif
110 # endif
111 #endif
112 return flags;
113 }
114
115 #ifdef DEBUG
116
117 # ifndef verbose
118 # define verbose 0
119 # endif
120 int z_verbose = verbose;
121
z_error(m)122 void z_error (m)
123 char *m;
124 {
125 fprintf(stderr, "%s\n", m);
126 exit(1);
127 }
128 #endif
129
130 /* exported to allow conversion of error code to string for compress() and
131 * uncompress()
132 */
zError(err)133 const char * ZEXPORT zError(err)
134 int err;
135 {
136 return ERR_MSG(err);
137 }
138
139 #if defined(_WIN32_WCE)
140 /* The Microsoft C Run-Time Library for Windows CE doesn't have
141 * errno. We define it as a global variable to simplify porting.
142 * Its value is always 0 and should not be used.
143 */
144 int errno = 0;
145 #endif
146
147 #ifndef HAVE_MEMCPY
148
zmemcpy(dest,source,len)149 void zmemcpy(dest, source, len)
150 Bytef* dest;
151 const Bytef* source;
152 uInt len;
153 {
154 if (len == 0) return;
155 do {
156 *dest++ = *source++; /* ??? to be unrolled */
157 } while (--len != 0);
158 }
159
zmemcmp(s1,s2,len)160 int zmemcmp(s1, s2, len)
161 const Bytef* s1;
162 const Bytef* s2;
163 uInt len;
164 {
165 uInt j;
166
167 for (j = 0; j < len; j++) {
168 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
169 }
170 return 0;
171 }
172
zmemzero(dest,len)173 void zmemzero(dest, len)
174 Bytef* dest;
175 uInt len;
176 {
177 if (len == 0) return;
178 do {
179 *dest++ = 0; /* ??? to be unrolled */
180 } while (--len != 0);
181 }
182 #endif
183
184
185 #ifdef SYS16BIT
186
187 #ifdef __TURBOC__
188 /* Turbo C in 16-bit mode */
189
190 # define MY_ZCALLOC
191
192 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
193 * and farmalloc(64K) returns a pointer with an offset of 8, so we
194 * must fix the pointer. Warning: the pointer must be put back to its
195 * original form in order to free it, use zcfree().
196 */
197
198 #define MAX_PTR 10
199 /* 10*64K = 640K */
200
201 local int next_ptr = 0;
202
203 typedef struct ptr_table_s {
204 voidpf org_ptr;
205 voidpf new_ptr;
206 } ptr_table;
207
208 local ptr_table table[MAX_PTR];
209 /* This table is used to remember the original form of pointers
210 * to large buffers (64K). Such pointers are normalized with a zero offset.
211 * Since MSDOS is not a preemptive multitasking OS, this table is not
212 * protected from concurrent access. This hack doesn't work anyway on
213 * a protected system like OS/2. Use Microsoft C instead.
214 */
215
zcalloc(voidpf opaque,unsigned items,unsigned size)216 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
217 {
218 voidpf buf = opaque; /* just to make some compilers happy */
219 ulg bsize = (ulg)items*size;
220
221 /* If we allocate less than 65520 bytes, we assume that farmalloc
222 * will return a usable pointer which doesn't have to be normalized.
223 */
224 if (bsize < 65520L) {
225 buf = farmalloc(bsize);
226 if (*(ush*)&buf != 0) return buf;
227 } else {
228 buf = farmalloc(bsize + 16L);
229 }
230 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
231 table[next_ptr].org_ptr = buf;
232
233 /* Normalize the pointer to seg:0 */
234 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
235 *(ush*)&buf = 0;
236 table[next_ptr++].new_ptr = buf;
237 return buf;
238 }
239
zcfree(voidpf opaque,voidpf ptr)240 void zcfree (voidpf opaque, voidpf ptr)
241 {
242 int n;
243 if (*(ush*)&ptr != 0) { /* object < 64K */
244 farfree(ptr);
245 return;
246 }
247 /* Find the original pointer */
248 for (n = 0; n < next_ptr; n++) {
249 if (ptr != table[n].new_ptr) continue;
250
251 farfree(table[n].org_ptr);
252 while (++n < next_ptr) {
253 table[n-1] = table[n];
254 }
255 next_ptr--;
256 return;
257 }
258 ptr = opaque; /* just to make some compilers happy */
259 Assert(0, "zcfree: ptr not found");
260 }
261
262 #endif /* __TURBOC__ */
263
264
265 #ifdef M_I86
266 /* Microsoft C in 16-bit mode */
267
268 # define MY_ZCALLOC
269
270 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
271 # define _halloc halloc
272 # define _hfree hfree
273 #endif
274
zcalloc(voidpf opaque,unsigned items,unsigned size)275 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
276 {
277 if (opaque) opaque = 0; /* to make compiler happy */
278 return _halloc((long)items, size);
279 }
280
zcfree(voidpf opaque,voidpf ptr)281 void zcfree (voidpf opaque, voidpf ptr)
282 {
283 if (opaque) opaque = 0; /* to make compiler happy */
284 _hfree(ptr);
285 }
286
287 #endif /* M_I86 */
288
289 #endif /* SYS16BIT */
290
291
292 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
293
294 #ifndef STDC
295 extern voidp malloc OF((uInt size));
296 extern voidp calloc OF((uInt items, uInt size));
297 extern void free OF((voidpf ptr));
298 #endif
299
zcalloc(opaque,items,size)300 voidpf zcalloc (opaque, items, size)
301 voidpf opaque;
302 unsigned items;
303 unsigned size;
304 {
305 if (opaque) items += size - size; /* make compiler happy */
306 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
307 (voidpf)calloc(items, size);
308 }
309
zcfree(opaque,ptr)310 void zcfree (opaque, ptr)
311 voidpf opaque;
312 voidpf ptr;
313 {
314 free(ptr);
315 if (opaque) return; /* make compiler happy */
316 }
317
318 #endif /* MY_ZCALLOC */
319