1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005, 2010, 2011, 2012 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 #ifndef Z_SOLO
10 # include "gzguts.h"
11 #endif
12
13 #ifndef NO_DUMMY_DECL
14 struct internal_state {int dummy;}; /* for buggy compilers */
15 #endif
16
17 z_const char * const z_errmsg[10] = {
18 "need dictionary", /* Z_NEED_DICT 2 */
19 "stream end", /* Z_STREAM_END 1 */
20 "", /* Z_OK 0 */
21 "file error", /* Z_ERRNO (-1) */
22 "stream error", /* Z_STREAM_ERROR (-2) */
23 "data error", /* Z_DATA_ERROR (-3) */
24 "insufficient memory", /* Z_MEM_ERROR (-4) */
25 "buffer error", /* Z_BUF_ERROR (-5) */
26 "incompatible version",/* Z_VERSION_ERROR (-6) */
27 ""};
28
29
zlibVersion()30 const char * ZEXPORT zlibVersion()
31 {
32 return ZLIB_VERSION;
33 }
34
zlibCompileFlags()35 uLong ZEXPORT zlibCompileFlags()
36 {
37 uLong flags;
38
39 flags = 0;
40 switch ((int)(sizeof(uInt))) {
41 case 2: break;
42 case 4: flags += 1; break;
43 case 8: flags += 2; break;
44 default: flags += 3;
45 }
46 switch ((int)(sizeof(uLong))) {
47 case 2: break;
48 case 4: flags += 1 << 2; break;
49 case 8: flags += 2 << 2; break;
50 default: flags += 3 << 2;
51 }
52 switch ((int)(sizeof(voidpf))) {
53 case 2: break;
54 case 4: flags += 1 << 4; break;
55 case 8: flags += 2 << 4; break;
56 default: flags += 3 << 4;
57 }
58 switch ((int)(sizeof(z_off_t))) {
59 case 2: break;
60 case 4: flags += 1 << 6; break;
61 case 8: flags += 2 << 6; break;
62 default: flags += 3 << 6;
63 }
64 #ifdef DEBUG
65 flags += 1 << 8;
66 #endif
67 #if defined(ASMV) || defined(ASMINF)
68 flags += 1 << 9;
69 #endif
70 #ifdef ZLIB_WINAPI
71 flags += 1 << 10;
72 #endif
73 #ifdef BUILDFIXED
74 flags += 1 << 12;
75 #endif
76 #ifdef DYNAMIC_CRC_TABLE
77 flags += 1 << 13;
78 #endif
79 #ifdef NO_GZCOMPRESS
80 flags += 1L << 16;
81 #endif
82 #ifdef NO_GZIP
83 flags += 1L << 17;
84 #endif
85 #ifdef PKZIP_BUG_WORKAROUND
86 flags += 1L << 20;
87 #endif
88 #ifdef FASTEST
89 flags += 1L << 21;
90 #endif
91 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
92 # ifdef NO_vsnprintf
93 flags += 1L << 25;
94 # ifdef HAS_vsprintf_void
95 flags += 1L << 26;
96 # endif
97 # else
98 # ifdef HAS_vsnprintf_void
99 flags += 1L << 26;
100 # endif
101 # endif
102 #else
103 flags += 1L << 24;
104 # ifdef NO_snprintf
105 flags += 1L << 25;
106 # ifdef HAS_sprintf_void
107 flags += 1L << 26;
108 # endif
109 # else
110 # ifdef HAS_snprintf_void
111 flags += 1L << 26;
112 # endif
113 # endif
114 #endif
115 return flags;
116 }
117
118 #ifdef DEBUG
119
120 # ifndef verbose
121 # define verbose 0
122 # endif
123 int ZLIB_INTERNAL z_verbose = verbose;
124
z_error(char * m)125 void ZLIB_INTERNAL z_error (
126 char *m)
127 {
128 fprintf(stderr, "%s\n", m);
129 exit(1);
130 }
131 #endif
132
133 /* exported to allow conversion of error code to string for compress() and
134 * uncompress()
135 */
zError(int err)136 const char * ZEXPORT zError(
137 int err)
138 {
139 return ERR_MSG(err);
140 }
141
142 #if defined(_WIN32_WCE)
143 /* The Microsoft C Run-Time Library for Windows CE doesn't have
144 * errno. We define it as a global variable to simplify porting.
145 * Its value is always 0 and should not be used.
146 */
147 /* does not exist on WCE. XYQ: and we don't need it! */
148 /*int errno = 0;*/
149 #endif
150
151 #ifndef HAVE_MEMCPY
152
zmemcpy(Bytef * dest,const Bytef * source,uInt len)153 void ZLIB_INTERNAL zmemcpy(
154 Bytef* dest,
155 const Bytef* source,
156 uInt len)
157 {
158 if (len == 0) return;
159 do {
160 *dest++ = *source++; /* ??? to be unrolled */
161 } while (--len != 0);
162 }
163
zmemcmp(const Bytef * s1,const Bytef * s2,uInt len)164 int ZLIB_INTERNAL zmemcmp(
165 const Bytef* s1,
166 const Bytef* s2,
167 uInt len)
168 {
169 uInt j;
170
171 for (j = 0; j < len; j++) {
172 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
173 }
174 return 0;
175 }
176
zmemzero(Bytef * dest,uInt len)177 void ZLIB_INTERNAL zmemzero(
178 Bytef* dest,
179 uInt len)
180 {
181 if (len == 0) return;
182 do {
183 *dest++ = 0; /* ??? to be unrolled */
184 } while (--len != 0);
185 }
186 #endif
187
188 #if 0
189 #ifndef Z_SOLO
190
191 #ifdef SYS16BIT
192
193 #ifdef __TURBOC__
194 /* Turbo C in 16-bit mode */
195
196 # define MY_ZCALLOC
197
198 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
199 * and farmalloc(64K) returns a pointer with an offset of 8, so we
200 * must fix the pointer. Warning: the pointer must be put back to its
201 * original form in order to free it, use zcfree().
202 */
203
204 #define MAX_PTR 10
205 /* 10*64K = 640K */
206
207 local int next_ptr = 0;
208
209 typedef struct ptr_table_s {
210 voidpf org_ptr;
211 voidpf new_ptr;
212 } ptr_table;
213
214 local ptr_table table[MAX_PTR];
215 /* This table is used to remember the original form of pointers
216 * to large buffers (64K). Such pointers are normalized with a zero offset.
217 * Since MSDOS is not a preemptive multitasking OS, this table is not
218 * protected from concurrent access. This hack doesn't work anyway on
219 * a protected system like OS/2. Use Microsoft C instead.
220 */
221
222 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
223 {
224 voidpf buf = opaque; /* just to make some compilers happy */
225 ulg bsize = (ulg)items*size;
226
227 /* If we allocate less than 65520 bytes, we assume that farmalloc
228 * will return a usable pointer which doesn't have to be normalized.
229 */
230 if (bsize < 65520L) {
231 buf = farmalloc(bsize);
232 if (*(ush*)&buf != 0) return buf;
233 } else {
234 buf = farmalloc(bsize + 16L);
235 }
236 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
237 table[next_ptr].org_ptr = buf;
238
239 /* Normalize the pointer to seg:0 */
240 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
241 *(ush*)&buf = 0;
242 table[next_ptr++].new_ptr = buf;
243 return buf;
244 }
245
246 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
247 {
248 int n;
249 if (*(ush*)&ptr != 0) { /* object < 64K */
250 farfree(ptr);
251 return;
252 }
253 /* Find the original pointer */
254 for (n = 0; n < next_ptr; n++) {
255 if (ptr != table[n].new_ptr) continue;
256
257 farfree(table[n].org_ptr);
258 while (++n < next_ptr) {
259 table[n-1] = table[n];
260 }
261 next_ptr--;
262 return;
263 }
264 ptr = opaque; /* just to make some compilers happy */
265 Assert(0, "zcfree: ptr not found");
266 }
267
268 #endif /* __TURBOC__ */
269
270
271 #ifdef M_I86
272 /* Microsoft C in 16-bit mode */
273
274 # define MY_ZCALLOC
275
276 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
277 # define _halloc halloc
278 # define _hfree hfree
279 #endif
280
281 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
282 {
283 if (opaque) opaque = 0; /* to make compiler happy */
284 return _halloc((long)items, size);
285 }
286
287 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
288 {
289 if (opaque) opaque = 0; /* to make compiler happy */
290 _hfree(ptr);
291 }
292
293 #endif /* M_I86 */
294
295 #endif /* SYS16BIT */
296
297
298 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
299
300 #ifndef STDC
301 extern voidp malloc OF((uInt size));
302 extern voidp calloc OF((uInt items, uInt size));
303 extern void free OF((voidpf ptr));
304 #endif
305
306 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
307 voidpf opaque;
308 unsigned items;
309 unsigned size;
310 {
311 if (opaque) items += size - size; /* make compiler happy */
312 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
313 (voidpf)calloc(items, size);
314 }
315
316 void ZLIB_INTERNAL zcfree (opaque, ptr)
317 voidpf opaque;
318 voidpf ptr;
319 {
320 free(ptr);
321 if (opaque) return; /* make compiler happy */
322 }
323
324 #endif /* MY_ZCALLOC */
325
326 #endif /* !Z_SOLO */
327 #endif /* 0 */
328
329 extern void* FXMEM_DefaultAlloc(size_t, int);
330 extern void FXMEM_DefaultFree(void*, int);
331
332 /* XYQ 2007-1-19 */
zcalloc(voidpf opaque,unsigned items,unsigned size)333 voidpf zcalloc(voidpf opaque, unsigned items, unsigned size)
334 {
335 return FXMEM_DefaultAlloc(items * size, 0);
336 }
337
zcfree(voidpf opaque,voidpf ptr)338 void zcfree(voidpf opaque, voidpf ptr)
339 {
340 FXMEM_DefaultFree(ptr, 0);
341 }
342