1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2017 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* @(#) $Id: zutil.c,v 1.1.1.2 2002/03/11 21:53:27 tromey Exp $ */
7
8 #include "zutil.h"
9 #ifndef Z_SOLO
10 # include "gzguts.h"
11 #endif
12
13 z_const char * const z_errmsg[10] = {
14 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
15 (z_const char *)"stream end", /* Z_STREAM_END 1 */
16 (z_const char *)"", /* Z_OK 0 */
17 (z_const char *)"file error", /* Z_ERRNO (-1) */
18 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
19 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
20 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
21 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
22 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
23 (z_const char *)""
24 };
25
26
27 const char * ZEXPORT zlibVersion()
28 {
29 return ZLIB_VERSION;
30 }
31
32 uLong ZEXPORT zlibCompileFlags()
33 {
34 uLong flags;
35
36 flags = 0;
37 switch ((int)(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 ((int)(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 ((int)(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 ((int)(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 ZLIB_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 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
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 ZLIB_DEBUG
116 #include <stdlib.h>
117 # ifndef verbose
118 # define verbose 0
119 # endif
120 int ZLIB_INTERNAL z_verbose = verbose;
121
122 void ZLIB_INTERNAL 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 */
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
149 void ZLIB_INTERNAL 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
160 int ZLIB_INTERNAL 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
173 void ZLIB_INTERNAL 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 #ifndef Z_SOLO
185
186 #ifdef SYS16BIT
187
188 #ifdef __TURBOC__
189 /* Turbo C in 16-bit mode */
190
191 # define MY_ZCALLOC
192
193 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
194 * and farmalloc(64K) returns a pointer with an offset of 8, so we
195 * must fix the pointer. Warning: the pointer must be put back to its
196 * original form in order to free it, use zcfree().
197 */
198
199 #define MAX_PTR 10
200 /* 10*64K = 640K */
201
202 local int next_ptr = 0;
203
204 typedef struct ptr_table_s {
205 voidpf org_ptr;
206 voidpf new_ptr;
207 } ptr_table;
208
209 local ptr_table table[MAX_PTR];
210 /* This table is used to remember the original form of pointers
211 * to large buffers (64K). Such pointers are normalized with a zero offset.
212 * Since MSDOS is not a preemptive multitasking OS, this table is not
213 * protected from concurrent access. This hack doesn't work anyway on
214 * a protected system like OS/2. Use Microsoft C instead.
215 */
216
217 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
218 {
219 voidpf buf;
220 ulg bsize = (ulg)items*size;
221
222 (void)opaque;
223
224 /* If we allocate less than 65520 bytes, we assume that farmalloc
225 * will return a usable pointer which doesn't have to be normalized.
226 */
227 if (bsize < 65520L) {
228 buf = farmalloc(bsize);
229 if (*(ush*)&buf != 0) return buf;
230 } else {
231 buf = farmalloc(bsize + 16L);
232 }
233 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
234 table[next_ptr].org_ptr = buf;
235
236 /* Normalize the pointer to seg:0 */
237 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
238 *(ush*)&buf = 0;
239 table[next_ptr++].new_ptr = buf;
240 return buf;
241 }
242
243 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
244 {
245 int n;
246
247 (void)opaque;
248
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 Assert(0, "zcfree: ptr not found");
265 }
266
267 #endif /* __TURBOC__ */
268
269
270 #ifdef M_I86
271 /* Microsoft C in 16-bit mode */
272
273 # define MY_ZCALLOC
274
275 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
276 # define _halloc halloc
277 # define _hfree hfree
278 #endif
279
280 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
281 {
282 (void)opaque;
283 return _halloc((long)items, size);
284 }
285
286 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
287 {
288 (void)opaque;
289 _hfree(ptr);
290 }
291
292 #endif /* M_I86 */
293
294 #endif /* SYS16BIT */
295
296
297 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
298
299 #ifndef STDC
300 extern voidp malloc OF((uInt size));
301 extern voidp calloc OF((uInt items, uInt size));
302 extern void free OF((voidpf ptr));
303 #endif
304
305 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
306 voidpf opaque;
307 unsigned items;
308 unsigned size;
309 {
310 (void)opaque;
311 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
312 (voidpf)calloc(items, size);
313 }
314
315 void ZLIB_INTERNAL zcfree (opaque, ptr)
316 voidpf opaque;
317 voidpf ptr;
318 {
319 (void)opaque;
320 free(ptr);
321 }
322
323 #endif /* MY_ZCALLOC */
324
325 #endif /* !Z_SOLO */