1 /*
2 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /* zutil.c -- target dependent utility functions for the compression library
7 * Copyright (C) 1995-2005 Jean-loup Gailly.
8 * For conditions of distribution and use, see copyright notice in zlib.h
9 */
10
11 #pragma ident "%Z%%M% %I% %E% SMI"
12
13 #include "zutil.h"
14
15 #ifndef NO_DUMMY_DECL
16 struct internal_state {int dummy;}; /* for buggy compilers */
17 #endif
18
19 const char * const z_errmsg[10] = {
20 "need dictionary", /* Z_NEED_DICT 2 */
21 "stream end", /* Z_STREAM_END 1 */
22 "", /* Z_OK 0 */
23 "file error", /* Z_ERRNO (-1) */
24 "stream error", /* Z_STREAM_ERROR (-2) */
25 "data error", /* Z_DATA_ERROR (-3) */
26 "insufficient memory", /* Z_MEM_ERROR (-4) */
27 "buffer error", /* Z_BUF_ERROR (-5) */
28 "incompatible version",/* Z_VERSION_ERROR (-6) */
29 ""};
30
31
zlibVersion()32 const char * ZEXPORT zlibVersion()
33 {
34 return ZLIB_VERSION;
35 }
36
zlibCompileFlags()37 uLong ZEXPORT zlibCompileFlags()
38 {
39 uLong flags;
40
41 flags = 0;
42 switch (sizeof(uInt)) {
43 case 2: break;
44 case 4: flags += 1; break;
45 case 8: flags += 2; break;
46 default: flags += 3;
47 }
48 switch (sizeof(uLong)) {
49 case 2: break;
50 case 4: flags += 1 << 2; break;
51 case 8: flags += 2 << 2; break;
52 default: flags += 3 << 2;
53 }
54 switch (sizeof(voidpf)) {
55 case 2: break;
56 case 4: flags += 1 << 4; break;
57 case 8: flags += 2 << 4; break;
58 default: flags += 3 << 4;
59 }
60 switch (sizeof(z_off_t)) {
61 case 2: break;
62 case 4: flags += 1 << 6; break;
63 case 8: flags += 2 << 6; break;
64 default: flags += 3 << 6;
65 }
66 #ifdef DEBUG
67 flags += 1 << 8;
68 #endif
69 #if defined(ASMV) || defined(ASMINF)
70 flags += 1 << 9;
71 #endif
72 #ifdef ZLIB_WINAPI
73 flags += 1 << 10;
74 #endif
75 #ifdef BUILDFIXED
76 flags += 1 << 12;
77 #endif
78 #ifdef DYNAMIC_CRC_TABLE
79 flags += 1 << 13;
80 #endif
81 #ifdef NO_GZCOMPRESS
82 flags += 1L << 16;
83 #endif
84 #ifdef NO_GZIP
85 flags += 1L << 17;
86 #endif
87 #ifdef PKZIP_BUG_WORKAROUND
88 flags += 1L << 20;
89 #endif
90 #ifdef FASTEST
91 flags += 1L << 21;
92 #endif
93 #ifdef STDC
94 # ifdef NO_vsnprintf
95 flags += 1L << 25;
96 # ifdef HAS_vsprintf_void
97 flags += 1L << 26;
98 # endif
99 # else
100 # ifdef HAS_vsnprintf_void
101 flags += 1L << 26;
102 # endif
103 # endif
104 #else
105 flags += 1L << 24;
106 # ifdef NO_snprintf
107 flags += 1L << 25;
108 # ifdef HAS_sprintf_void
109 flags += 1L << 26;
110 # endif
111 # else
112 # ifdef HAS_snprintf_void
113 flags += 1L << 26;
114 # endif
115 # endif
116 #endif
117 return flags;
118 }
119
120 #ifdef DEBUG
121
122 # ifndef verbose
123 # define verbose 0
124 # endif
125 int z_verbose = verbose;
126
z_error(m)127 void z_error (m)
128 char *m;
129 {
130 fprintf(stderr, "%s\n", m);
131 exit(1);
132 }
133 #endif
134
135 /* exported to allow conversion of error code to string for compress() and
136 * uncompress()
137 */
zError(err)138 const char * ZEXPORT zError(err)
139 int err;
140 {
141 return ERR_MSG(err);
142 }
143
144 #if defined(_WIN32_WCE)
145 /* The Microsoft C Run-Time Library for Windows CE doesn't have
146 * errno. We define it as a global variable to simplify porting.
147 * Its value is always 0 and should not be used.
148 */
149 int errno = 0;
150 #endif
151
152 #define HAVE_MEMCPY
153 #ifndef HAVE_MEMCPY
154
zmemcpy(dest,source,len)155 void zmemcpy(dest, source, len)
156 Bytef* dest;
157 const Bytef* source;
158 uInt len;
159 {
160 if (len == 0) return;
161 do {
162 *dest++ = *source++; /* ??? to be unrolled */
163 } while (--len != 0);
164 }
165
zmemcmp(s1,s2,len)166 int zmemcmp(s1, s2, len)
167 const Bytef* s1;
168 const Bytef* s2;
169 uInt len;
170 {
171 uInt j;
172
173 for (j = 0; j < len; j++) {
174 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
175 }
176 return 0;
177 }
178
zmemzero(dest,len)179 void zmemzero(dest, len)
180 Bytef* dest;
181 uInt len;
182 {
183 if (len == 0) return;
184 do {
185 *dest++ = 0; /* ??? to be unrolled */
186 } while (--len != 0);
187 }
188 #endif
189
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
zcalloc(voidpf opaque,unsigned items,unsigned size)222 voidpf 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
zcfree(voidpf opaque,voidpf ptr)246 void 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
zcalloc(voidpf opaque,unsigned items,unsigned size)281 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
282 {
283 if (opaque) opaque = 0; /* to make compiler happy */
284 return _halloc((long)items, size);
285 }
286
zcfree(voidpf opaque,voidpf ptr)287 void 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
zcalloc(opaque,items,size)306 voidpf 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
zcfree(opaque,ptr)316 void 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