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: //poco/Main/Foundation/src/zutil.c#8 $ */ |
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 | |
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 (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 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 | #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 ZLIB_DEBUG |
116 | |
117 | # ifndef verbose |
118 | # define verbose 0 |
119 | # endif |
120 | int z_verbose = verbose; |
121 | |
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 | */ |
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 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 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 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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |