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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 | /* @(#) $Id$ */ |
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 |
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64 | /* |
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65 | #if defined(ASMV) || defined(ASMINF) |
66 | flags += 1 << 9; |
67 | #endif |
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68 | */ |
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69 | #ifdef ZLIB_WINAPI |
70 | flags += 1 << 10; |
71 | #endif |
72 | #ifdef BUILDFIXED |
73 | flags += 1 << 12; |
74 | #endif |
75 | #ifdef DYNAMIC_CRC_TABLE |
76 | flags += 1 << 13; |
77 | #endif |
78 | #ifdef NO_GZCOMPRESS |
79 | flags += 1L << 16; |
80 | #endif |
81 | #ifdef NO_GZIP |
82 | flags += 1L << 17; |
83 | #endif |
84 | #ifdef PKZIP_BUG_WORKAROUND |
85 | flags += 1L << 20; |
86 | #endif |
87 | #ifdef FASTEST |
88 | flags += 1L << 21; |
89 | #endif |
90 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
91 | # ifdef NO_vsnprintf |
92 | flags += 1L << 25; |
93 | # ifdef HAS_vsprintf_void |
94 | flags += 1L << 26; |
95 | # endif |
96 | # else |
97 | # ifdef HAS_vsnprintf_void |
98 | flags += 1L << 26; |
99 | # endif |
100 | # endif |
101 | #else |
102 | flags += 1L << 24; |
103 | # ifdef NO_snprintf |
104 | flags += 1L << 25; |
105 | # ifdef HAS_sprintf_void |
106 | flags += 1L << 26; |
107 | # endif |
108 | # else |
109 | # ifdef HAS_snprintf_void |
110 | flags += 1L << 26; |
111 | # endif |
112 | # endif |
113 | #endif |
114 | return flags; |
115 | } |
116 | |
117 | #ifdef ZLIB_DEBUG |
118 | #include <stdlib.h> |
119 | # ifndef verbose |
120 | # define verbose 0 |
121 | # endif |
122 | int ZLIB_INTERNAL z_verbose = verbose; |
123 | |
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124 | void ZLIB_INTERNAL z_error(m) |
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125 | char *m; |
126 | { |
127 | fprintf(stderr, "%s\n", m); |
128 | exit(1); |
129 | } |
130 | #endif |
131 | |
132 | /* exported to allow conversion of error code to string for compress() and |
133 | * uncompress() |
134 | */ |
135 | const char * ZEXPORT zError(err) |
136 | int err; |
137 | { |
138 | return ERR_MSG(err); |
139 | } |
140 | |
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141 | #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800 |
142 | /* The older Microsoft C Run-Time Library for Windows CE doesn't have |
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143 | * errno. We define it as a global variable to simplify porting. |
144 | * Its value is always 0 and should not be used. |
145 | */ |
146 | int errno = 0; |
147 | #endif |
148 | |
149 | #ifndef HAVE_MEMCPY |
150 | |
151 | void ZLIB_INTERNAL zmemcpy(dest, source, len) |
152 | Bytef* dest; |
153 | const Bytef* source; |
154 | uInt len; |
155 | { |
156 | if (len == 0) return; |
157 | do { |
158 | *dest++ = *source++; /* ??? to be unrolled */ |
159 | } while (--len != 0); |
160 | } |
161 | |
162 | int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
163 | const Bytef* s1; |
164 | const Bytef* s2; |
165 | uInt len; |
166 | { |
167 | uInt j; |
168 | |
169 | for (j = 0; j < len; j++) { |
170 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
171 | } |
172 | return 0; |
173 | } |
174 | |
175 | void ZLIB_INTERNAL zmemzero(dest, len) |
176 | Bytef* dest; |
177 | uInt len; |
178 | { |
179 | if (len == 0) return; |
180 | do { |
181 | *dest++ = 0; /* ??? to be unrolled */ |
182 | } while (--len != 0); |
183 | } |
184 | #endif |
185 | |
186 | #ifndef Z_SOLO |
187 | |
188 | #ifdef SYS16BIT |
189 | |
190 | #ifdef __TURBOC__ |
191 | /* Turbo C in 16-bit mode */ |
192 | |
193 | # define MY_ZCALLOC |
194 | |
195 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
196 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
197 | * must fix the pointer. Warning: the pointer must be put back to its |
198 | * original form in order to free it, use zcfree(). |
199 | */ |
200 | |
201 | #define MAX_PTR 10 |
202 | /* 10*64K = 640K */ |
203 | |
204 | local int next_ptr = 0; |
205 | |
206 | typedef struct ptr_table_s { |
207 | voidpf org_ptr; |
208 | voidpf new_ptr; |
209 | } ptr_table; |
210 | |
211 | local ptr_table table[MAX_PTR]; |
212 | /* This table is used to remember the original form of pointers |
213 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
214 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
215 | * protected from concurrent access. This hack doesn't work anyway on |
216 | * a protected system like OS/2. Use Microsoft C instead. |
217 | */ |
218 | |
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219 | voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) |
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220 | { |
221 | voidpf buf; |
222 | ulg bsize = (ulg)items*size; |
223 | |
224 | (void)opaque; |
225 | |
226 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
227 | * will return a usable pointer which doesn't have to be normalized. |
228 | */ |
229 | if (bsize < 65520L) { |
230 | buf = farmalloc(bsize); |
231 | if (*(ush*)&buf != 0) return buf; |
232 | } else { |
233 | buf = farmalloc(bsize + 16L); |
234 | } |
235 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
236 | table[next_ptr].org_ptr = buf; |
237 | |
238 | /* Normalize the pointer to seg:0 */ |
239 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
240 | *(ush*)&buf = 0; |
241 | table[next_ptr++].new_ptr = buf; |
242 | return buf; |
243 | } |
244 | |
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245 | void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) |
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246 | { |
247 | int n; |
248 | |
249 | (void)opaque; |
250 | |
251 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
252 | farfree(ptr); |
253 | return; |
254 | } |
255 | /* Find the original pointer */ |
256 | for (n = 0; n < next_ptr; n++) { |
257 | if (ptr != table[n].new_ptr) continue; |
258 | |
259 | farfree(table[n].org_ptr); |
260 | while (++n < next_ptr) { |
261 | table[n-1] = table[n]; |
262 | } |
263 | next_ptr--; |
264 | return; |
265 | } |
266 | Assert(0, "zcfree: ptr not found"); |
267 | } |
268 | |
269 | #endif /* __TURBOC__ */ |
270 | |
271 | |
272 | #ifdef M_I86 |
273 | /* Microsoft C in 16-bit mode */ |
274 | |
275 | # define MY_ZCALLOC |
276 | |
277 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
278 | # define _halloc halloc |
279 | # define _hfree hfree |
280 | #endif |
281 | |
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282 | voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) |
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283 | { |
284 | (void)opaque; |
285 | return _halloc((long)items, size); |
286 | } |
287 | |
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288 | void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) |
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289 | { |
290 | (void)opaque; |
291 | _hfree(ptr); |
292 | } |
293 | |
294 | #endif /* M_I86 */ |
295 | |
296 | #endif /* SYS16BIT */ |
297 | |
298 | |
299 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
300 | |
301 | #ifndef STDC |
302 | extern voidp malloc OF((uInt size)); |
303 | extern voidp calloc OF((uInt items, uInt size)); |
304 | extern void free OF((voidpf ptr)); |
305 | #endif |
306 | |
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307 | voidpf ZLIB_INTERNAL zcalloc(opaque, items, size) |
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308 | voidpf opaque; |
309 | unsigned items; |
310 | unsigned size; |
311 | { |
312 | (void)opaque; |
313 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
314 | (voidpf)calloc(items, size); |
315 | } |
316 | |
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317 | void ZLIB_INTERNAL zcfree(opaque, ptr) |
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318 | voidpf opaque; |
319 | voidpf ptr; |
320 | { |
321 | (void)opaque; |
322 | free(ptr); |
323 | } |
324 | |
325 | #endif /* MY_ZCALLOC */ |
326 | |
327 | #endif /* !Z_SOLO */ |