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 #include "zutil.h"
7
8 #ifndef _KERNEL
9 #ifndef Z_SOLO
10 # include "gzguts.h"
11 #endif
12 #endif
13
14 z_const char * const z_errmsg[10] = {
15 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
16 (z_const char *)"stream end", /* Z_STREAM_END 1 */
17 (z_const char *)"", /* Z_OK 0 */
18 (z_const char *)"file error", /* Z_ERRNO (-1) */
19 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
20 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
21 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
22 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
23 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
24 (z_const char *)""
25 };
26
27
zlibVersion(void)28 const char * ZEXPORT zlibVersion(void) {
29 return ZLIB_VERSION;
30 }
31
zlibCompileFlags(void)32 uLong ZEXPORT zlibCompileFlags(void) {
33 uLong flags;
34
35 flags = 0;
36 switch ((int)(sizeof(uInt))) {
37 case 2: break;
38 case 4: flags += 1; break;
39 case 8: flags += 2; break;
40 default: flags += 3;
41 }
42 switch ((int)(sizeof(uLong))) {
43 case 2: break;
44 case 4: flags += 1 << 2; break;
45 case 8: flags += 2 << 2; break;
46 default: flags += 3 << 2;
47 }
48 switch ((int)(sizeof(voidpf))) {
49 case 2: break;
50 case 4: flags += 1 << 4; break;
51 case 8: flags += 2 << 4; break;
52 default: flags += 3 << 4;
53 }
54 switch ((int)(sizeof(z_off_t))) {
55 case 2: break;
56 case 4: flags += 1 << 6; break;
57 case 8: flags += 2 << 6; break;
58 default: flags += 3 << 6;
59 }
60 #ifdef ZLIB_DEBUG
61 flags += 1 << 8;
62 #endif
63 /*
64 #if defined(ASMV) || defined(ASMINF)
65 flags += 1 << 9;
66 #endif
67 */
68 #ifdef ZLIB_WINAPI
69 flags += 1 << 10;
70 #endif
71 #ifdef BUILDFIXED
72 flags += 1 << 12;
73 #endif
74 #ifdef DYNAMIC_CRC_TABLE
75 flags += 1 << 13;
76 #endif
77 #ifdef NO_GZCOMPRESS
78 flags += 1L << 16;
79 #endif
80 #ifdef NO_GZIP
81 flags += 1L << 17;
82 #endif
83 #ifdef PKZIP_BUG_WORKAROUND
84 flags += 1L << 20;
85 #endif
86 #ifdef FASTEST
87 flags += 1L << 21;
88 #endif
89 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
90 # ifdef NO_vsnprintf
91 flags += 1L << 25;
92 # ifdef HAS_vsprintf_void
93 flags += 1L << 26;
94 # endif
95 # else
96 # ifdef HAS_vsnprintf_void
97 flags += 1L << 26;
98 # endif
99 # endif
100 #else
101 flags += 1L << 24;
102 # ifdef NO_snprintf
103 flags += 1L << 25;
104 # ifdef HAS_sprintf_void
105 flags += 1L << 26;
106 # endif
107 # else
108 # ifdef HAS_snprintf_void
109 flags += 1L << 26;
110 # endif
111 # endif
112 #endif
113 return flags;
114 }
115
116 #ifdef ZLIB_DEBUG
117 #include <stdlib.h>
118 # ifndef verbose
119 # define verbose 0
120 # endif
121 int ZLIB_INTERNAL z_verbose = verbose;
122
z_error(char * m)123 void ZLIB_INTERNAL z_error(char *m) {
124 fprintf(stderr, "%s\n", m);
125 exit(1);
126 }
127 #endif
128
129 /* exported to allow conversion of error code to string for compress() and
130 * uncompress()
131 */
zError(int err)132 const char * ZEXPORT zError(int err) {
133 return ERR_MSG(err);
134 }
135
136 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
137 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
138 * errno. We define it as a global variable to simplify porting.
139 * Its value is always 0 and should not be used.
140 */
141 int errno = 0;
142 #endif
143
144 #ifndef HAVE_MEMCPY
145
zmemcpy(Bytef * dest,const Bytef * source,uInt len)146 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) {
147 if (len == 0) return;
148 do {
149 *dest++ = *source++; /* ??? to be unrolled */
150 } while (--len != 0);
151 }
152
zmemcmp(const Bytef * s1,const Bytef * s2,uInt len)153 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) {
154 uInt j;
155
156 for (j = 0; j < len; j++) {
157 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
158 }
159 return 0;
160 }
161
zmemzero(Bytef * dest,uInt len)162 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) {
163 if (len == 0) return;
164 do {
165 *dest++ = 0; /* ??? to be unrolled */
166 } while (--len != 0);
167 }
168 #endif
169
170 #ifndef Z_SOLO
171
172 #ifdef SYS16BIT
173
174 #ifdef __TURBOC__
175 /* Turbo C in 16-bit mode */
176
177 # define MY_ZCALLOC
178
179 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
180 * and farmalloc(64K) returns a pointer with an offset of 8, so we
181 * must fix the pointer. Warning: the pointer must be put back to its
182 * original form in order to free it, use zcfree().
183 */
184
185 #define MAX_PTR 10
186 /* 10*64K = 640K */
187
188 local int next_ptr = 0;
189
190 typedef struct ptr_table_s {
191 voidpf org_ptr;
192 voidpf new_ptr;
193 } ptr_table;
194
195 local ptr_table table[MAX_PTR];
196 /* This table is used to remember the original form of pointers
197 * to large buffers (64K). Such pointers are normalized with a zero offset.
198 * Since MSDOS is not a preemptive multitasking OS, this table is not
199 * protected from concurrent access. This hack doesn't work anyway on
200 * a protected system like OS/2. Use Microsoft C instead.
201 */
202
zcalloc(voidpf opaque,unsigned items,unsigned size)203 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
204 voidpf buf;
205 ulg bsize = (ulg)items*size;
206
207 (void)opaque;
208
209 /* If we allocate less than 65520 bytes, we assume that farmalloc
210 * will return a usable pointer which doesn't have to be normalized.
211 */
212 if (bsize < 65520L) {
213 buf = farmalloc(bsize);
214 if (*(ush*)&buf != 0) return buf;
215 } else {
216 buf = farmalloc(bsize + 16L);
217 }
218 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
219 table[next_ptr].org_ptr = buf;
220
221 /* Normalize the pointer to seg:0 */
222 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
223 *(ush*)&buf = 0;
224 table[next_ptr++].new_ptr = buf;
225 return buf;
226 }
227
zcfree(voidpf opaque,voidpf ptr)228 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
229 int n;
230
231 (void)opaque;
232
233 if (*(ush*)&ptr != 0) { /* object < 64K */
234 farfree(ptr);
235 return;
236 }
237 /* Find the original pointer */
238 for (n = 0; n < next_ptr; n++) {
239 if (ptr != table[n].new_ptr) continue;
240
241 farfree(table[n].org_ptr);
242 while (++n < next_ptr) {
243 table[n-1] = table[n];
244 }
245 next_ptr--;
246 return;
247 }
248 Assert(0, "zcfree: ptr not found");
249 }
250
251 #endif /* __TURBOC__ */
252
253
254 #ifdef M_I86
255 /* Microsoft C in 16-bit mode */
256
257 # define MY_ZCALLOC
258
259 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
260 # define _halloc halloc
261 # define _hfree hfree
262 #endif
263
zcalloc(voidpf opaque,uInt items,uInt size)264 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) {
265 (void)opaque;
266 return _halloc((long)items, size);
267 }
268
zcfree(voidpf opaque,voidpf ptr)269 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
270 (void)opaque;
271 _hfree(ptr);
272 }
273
274 #endif /* M_I86 */
275
276 #endif /* SYS16BIT */
277
278
279 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
280
281 #ifndef STDC
282 extern voidp malloc(uInt size);
283 extern voidp calloc(uInt items, uInt size);
284 extern void free(voidpf ptr);
285 #endif
286
zcalloc(voidpf opaque,unsigned items,unsigned size)287 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
288 (void)opaque;
289 if (items == 0 || size == 0)
290 return (NULL);
291 return reallocarray(NULL, items, size);
292 }
293
zcfree(voidpf opaque,voidpf ptr)294 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
295 (void)opaque;
296 free(ptr);
297 }
298
299 #endif /* MY_ZCALLOC */
300
301 #endif /* !Z_SOLO */
302