1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /* zutil.c -- target dependent utility functions for the compression library
26 * Copyright (C) 1995-2017 Jean-loup Gailly
27 * For conditions of distribution and use, see copyright notice in zlib.h
28 */
29
30 /* @(#) $Id$ */
31
32 #include "zutil.h"
33
34 #ifndef Z_SOLO
35 # include "gzguts.h"
36 #endif
37
38 z_const char * const z_errmsg[10] = {
39 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
40 (z_const char *)"stream end", /* Z_STREAM_END 1 */
41 (z_const char *)"", /* Z_OK 0 */
42 (z_const char *)"file error", /* Z_ERRNO (-1) */
43 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
44 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
45 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
46 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
47 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
48 (z_const char *)""
49 };
50
51
52 const char * ZEXPORT zlibVersion()
53 {
54 return ZLIB_VERSION;
55 }
56
57 uLong ZEXPORT zlibCompileFlags()
58 {
59 uLong flags;
60
61 flags = 0;
62 switch ((int)(sizeof(uInt))) {
63 case 2: break;
64 case 4: flags += 1; break;
65 case 8: flags += 2; break;
66 default: flags += 3;
67 }
68 switch ((int)(sizeof(uLong))) {
69 case 2: break;
70 case 4: flags += 1 << 2; break;
71 case 8: flags += 2 << 2; break;
72 default: flags += 3 << 2;
73 }
74 switch ((int)(sizeof(voidpf))) {
75 case 2: break;
76 case 4: flags += 1 << 4; break;
77 case 8: flags += 2 << 4; break;
78 default: flags += 3 << 4;
79 }
80 switch ((int)(sizeof(z_off_t))) {
81 case 2: break;
82 case 4: flags += 1 << 6; break;
83 case 8: flags += 2 << 6; break;
84 default: flags += 3 << 6;
85 }
86 #ifdef ZLIB_DEBUG
87 flags += 1 << 8;
88 #endif
89 #if defined(ASMV) || defined(ASMINF)
90 flags += 1 << 9;
91 #endif
92 #ifdef ZLIB_WINAPI
93 flags += 1 << 10;
94 #endif
95 #ifdef BUILDFIXED
96 flags += 1 << 12;
97 #endif
98 #ifdef DYNAMIC_CRC_TABLE
99 flags += 1 << 13;
100 #endif
101 #ifdef NO_GZCOMPRESS
102 flags += 1L << 16;
103 #endif
104 #ifdef NO_GZIP
105 flags += 1L << 17;
106 #endif
107 #ifdef PKZIP_BUG_WORKAROUND
108 flags += 1L << 20;
109 #endif
110 #ifdef FASTEST
111 flags += 1L << 21;
112 #endif
113 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
114 # ifdef NO_vsnprintf
115 flags += 1L << 25;
116 # ifdef HAS_vsprintf_void
117 flags += 1L << 26;
118 # endif
119 # else
120 # ifdef HAS_vsnprintf_void
121 flags += 1L << 26;
122 # endif
123 # endif
124 #else
125 flags += 1L << 24;
126 # ifdef NO_snprintf
127 flags += 1L << 25;
128 # ifdef HAS_sprintf_void
129 flags += 1L << 26;
130 # endif
131 # else
132 # ifdef HAS_snprintf_void
133 flags += 1L << 26;
134 # endif
135 # endif
136 #endif
137 return flags;
138 }
139
140 #ifdef ZLIB_DEBUG
141 #include <stdlib.h>
142 # ifndef verbose
143 # define verbose 0
144 # endif
145 int ZLIB_INTERNAL z_verbose = verbose;
146
147 void ZLIB_INTERNAL z_error (m)
148 char *m;
149 {
150 fprintf(stderr, "%s\n", m);
151 exit(1);
152 }
153 #endif
154
155 /* exported to allow conversion of error code to string for compress() and
156 * uncompress()
157 */
158 const char * ZEXPORT zError(err)
159 int err;
160 {
161 return ERR_MSG(err);
162 }
163
164 #if defined(_WIN32_WCE)
165 /* The Microsoft C Run-Time Library for Windows CE doesn't have
166 * errno. We define it as a global variable to simplify porting.
167 * Its value is always 0 and should not be used.
168 */
169 int errno = 0;
170 #endif
171
172 #ifndef HAVE_MEMCPY
173
174 void ZLIB_INTERNAL zmemcpy(dest, source, len)
175 Bytef* dest;
176 const Bytef* source;
177 uInt len;
178 {
179 if (len == 0) return;
180 do {
181 *dest++ = *source++; /* ??? to be unrolled */
182 } while (--len != 0);
183 }
184
185 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
186 const Bytef* s1;
187 const Bytef* s2;
188 uInt len;
189 {
190 uInt j;
191
192 for (j = 0; j < len; j++) {
193 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
194 }
195 return 0;
196 }
197
198 void ZLIB_INTERNAL zmemzero(dest, len)
199 Bytef* dest;
200 uInt len;
201 {
202 if (len == 0) return;
203 do {
204 *dest++ = 0; /* ??? to be unrolled */
205 } while (--len != 0);
206 }
207 #endif
208
209 #ifndef Z_SOLO
210
211 #ifdef SYS16BIT
212
213 #ifdef __TURBOC__
214 /* Turbo C in 16-bit mode */
215
216 # define MY_ZCALLOC
217
218 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
219 * and farmalloc(64K) returns a pointer with an offset of 8, so we
220 * must fix the pointer. Warning: the pointer must be put back to its
221 * original form in order to free it, use zcfree().
222 */
223
224 #define MAX_PTR 10
225 /* 10*64K = 640K */
226
227 local int next_ptr = 0;
228
229 typedef struct ptr_table_s {
230 voidpf org_ptr;
231 voidpf new_ptr;
232 } ptr_table;
233
234 local ptr_table table[MAX_PTR];
235 /* This table is used to remember the original form of pointers
236 * to large buffers (64K). Such pointers are normalized with a zero offset.
237 * Since MSDOS is not a preemptive multitasking OS, this table is not
238 * protected from concurrent access. This hack doesn't work anyway on
239 * a protected system like OS/2. Use Microsoft C instead.
240 */
241
242 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
243 {
244 voidpf buf;
245 ulg bsize = (ulg)items*size;
246
247 (void)opaque;
248
249 /* If we allocate less than 65520 bytes, we assume that farmalloc
250 * will return a usable pointer which doesn't have to be normalized.
251 */
252 if (bsize < 65520L) {
253 buf = farmalloc(bsize);
254 if (*(ush*)&buf != 0) return buf;
255 } else {
256 buf = farmalloc(bsize + 16L);
257 }
258 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
259 table[next_ptr].org_ptr = buf;
260
261 /* Normalize the pointer to seg:0 */
262 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
263 *(ush*)&buf = 0;
264 table[next_ptr++].new_ptr = buf;
265 return buf;
266 }
267
268 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
269 {
270 int n;
271
272 (void)opaque;
273
274 if (*(ush*)&ptr != 0) { /* object < 64K */
275 farfree(ptr);
276 return;
277 }
278 /* Find the original pointer */
279 for (n = 0; n < next_ptr; n++) {
280 if (ptr != table[n].new_ptr) continue;
281
282 farfree(table[n].org_ptr);
283 while (++n < next_ptr) {
284 table[n-1] = table[n];
285 }
286 next_ptr--;
287 return;
288 }
289 Assert(0, "zcfree: ptr not found");
290 }
291
292 #endif /* __TURBOC__ */
293
294
295 #ifdef M_I86
296 /* Microsoft C in 16-bit mode */
297
298 # define MY_ZCALLOC
299
300 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
301 # define _halloc halloc
302 # define _hfree hfree
303 #endif
304
305 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
306 {
307 (void)opaque;
308 return _halloc((long)items, size);
309 }
310
311 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
312 {
313 (void)opaque;
314 _hfree(ptr);
315 }
316
317 #endif /* M_I86 */
318
319 #endif /* SYS16BIT */
320
321
322 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
323
324 #ifndef STDC
325 extern voidp malloc OF((uInt size));
326 extern voidp calloc OF((uInt items, uInt size));
327 extern void free OF((voidpf ptr));
328 #endif
329
330 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
331 voidpf opaque;
332 unsigned items;
333 unsigned size;
334 {
335 (void)opaque;
336 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
337 (voidpf)calloc(items, size);
338 }
339
340 void ZLIB_INTERNAL zcfree (opaque, ptr)
341 voidpf opaque;
342 voidpf ptr;
343 {
344 (void)opaque;
345 free(ptr);
346 }
347
348 #endif /* MY_ZCALLOC */
349
350 #endif /* !Z_SOLO */