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initial.commit3d533e02008-07-27 00:38:33 +00001/* zutil.c -- target dependent utility functions for the compression library
mark13dc2462017-02-14 22:15:29 -08002 * Copyright (C) 1995-2017 Jean-loup Gailly
initial.commit3d533e02008-07-27 00:38:33 +00003 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +00006/* @(#) $Id$ */
initial.commit3d533e02008-07-27 00:38:33 +00007
8#include "zutil.h"
jiadong.zhu6c142162016-06-22 21:22:18 -07009#ifndef Z_SOLO
10# include "gzguts.h"
11#endif
initial.commit3d533e02008-07-27 00:38:33 +000012
jiadong.zhu6c142162016-06-22 21:22:18 -070013z_const char * const z_errmsg[10] = {
mark13dc2462017-02-14 22:15:29 -080014 (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};
initial.commit3d533e02008-07-27 00:38:33 +000025
26
27const char * ZEXPORT zlibVersion()
28{
29 return ZLIB_VERSION;
30}
31
32uLong ZEXPORT zlibCompileFlags()
33{
34 uLong flags;
35
36 flags = 0;
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +000037 switch ((int)(sizeof(uInt))) {
initial.commit3d533e02008-07-27 00:38:33 +000038 case 2: break;
39 case 4: flags += 1; break;
40 case 8: flags += 2; break;
41 default: flags += 3;
42 }
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +000043 switch ((int)(sizeof(uLong))) {
initial.commit3d533e02008-07-27 00:38:33 +000044 case 2: break;
45 case 4: flags += 1 << 2; break;
46 case 8: flags += 2 << 2; break;
47 default: flags += 3 << 2;
48 }
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +000049 switch ((int)(sizeof(voidpf))) {
initial.commit3d533e02008-07-27 00:38:33 +000050 case 2: break;
51 case 4: flags += 1 << 4; break;
52 case 8: flags += 2 << 4; break;
53 default: flags += 3 << 4;
54 }
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +000055 switch ((int)(sizeof(z_off_t))) {
initial.commit3d533e02008-07-27 00:38:33 +000056 case 2: break;
57 case 4: flags += 1 << 6; break;
58 case 8: flags += 2 << 6; break;
59 default: flags += 3 << 6;
60 }
mark13dc2462017-02-14 22:15:29 -080061#ifdef ZLIB_DEBUG
initial.commit3d533e02008-07-27 00:38:33 +000062 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
jiadong.zhu6c142162016-06-22 21:22:18 -070088#if defined(STDC) || defined(Z_HAVE_STDARG_H)
initial.commit3d533e02008-07-27 00:38:33 +000089# ifdef NO_vsnprintf
jiadong.zhu6c142162016-06-22 21:22:18 -070090 flags += 1L << 25;
initial.commit3d533e02008-07-27 00:38:33 +000091# ifdef HAS_vsprintf_void
jiadong.zhu6c142162016-06-22 21:22:18 -070092 flags += 1L << 26;
initial.commit3d533e02008-07-27 00:38:33 +000093# endif
94# else
95# ifdef HAS_vsnprintf_void
jiadong.zhu6c142162016-06-22 21:22:18 -070096 flags += 1L << 26;
initial.commit3d533e02008-07-27 00:38:33 +000097# endif
98# endif
99#else
jiadong.zhu6c142162016-06-22 21:22:18 -0700100 flags += 1L << 24;
initial.commit3d533e02008-07-27 00:38:33 +0000101# ifdef NO_snprintf
jiadong.zhu6c142162016-06-22 21:22:18 -0700102 flags += 1L << 25;
initial.commit3d533e02008-07-27 00:38:33 +0000103# ifdef HAS_sprintf_void
jiadong.zhu6c142162016-06-22 21:22:18 -0700104 flags += 1L << 26;
initial.commit3d533e02008-07-27 00:38:33 +0000105# endif
106# else
107# ifdef HAS_snprintf_void
jiadong.zhu6c142162016-06-22 21:22:18 -0700108 flags += 1L << 26;
initial.commit3d533e02008-07-27 00:38:33 +0000109# endif
110# endif
111#endif
112 return flags;
113}
114
mark13dc2462017-02-14 22:15:29 -0800115#ifdef ZLIB_DEBUG
116#include <stdlib.h>
initial.commit3d533e02008-07-27 00:38:33 +0000117# ifndef verbose
118# define verbose 0
119# endif
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000120int ZLIB_INTERNAL z_verbose = verbose;
initial.commit3d533e02008-07-27 00:38:33 +0000121
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000122void ZLIB_INTERNAL z_error (m)
initial.commit3d533e02008-07-27 00:38:33 +0000123 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 */
133const 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 */
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000144 int errno = 0;
initial.commit3d533e02008-07-27 00:38:33 +0000145#endif
146
147#ifndef HAVE_MEMCPY
148
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000149void ZLIB_INTERNAL zmemcpy(dest, source, len)
initial.commit3d533e02008-07-27 00:38:33 +0000150 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
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000160int ZLIB_INTERNAL zmemcmp(s1, s2, len)
initial.commit3d533e02008-07-27 00:38:33 +0000161 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
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000173void ZLIB_INTERNAL zmemzero(dest, len)
initial.commit3d533e02008-07-27 00:38:33 +0000174 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
jiadong.zhu6c142162016-06-22 21:22:18 -0700184#ifndef Z_SOLO
initial.commit3d533e02008-07-27 00:38:33 +0000185
186#ifdef SYS16BIT
187
188#ifdef __TURBOC__
189/* Turbo C in 16-bit mode */
190
191# define MY_ZCALLOC
192
193/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
194 * and farmalloc(64K) returns a pointer with an offset of 8, so we
195 * must fix the pointer. Warning: the pointer must be put back to its
196 * original form in order to free it, use zcfree().
197 */
198
199#define MAX_PTR 10
200/* 10*64K = 640K */
201
202local int next_ptr = 0;
203
204typedef struct ptr_table_s {
205 voidpf org_ptr;
206 voidpf new_ptr;
207} ptr_table;
208
209local ptr_table table[MAX_PTR];
210/* This table is used to remember the original form of pointers
211 * to large buffers (64K). Such pointers are normalized with a zero offset.
212 * Since MSDOS is not a preemptive multitasking OS, this table is not
213 * protected from concurrent access. This hack doesn't work anyway on
214 * a protected system like OS/2. Use Microsoft C instead.
215 */
216
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000217voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
initial.commit3d533e02008-07-27 00:38:33 +0000218{
mark13dc2462017-02-14 22:15:29 -0800219 voidpf buf;
initial.commit3d533e02008-07-27 00:38:33 +0000220 ulg bsize = (ulg)items*size;
221
mark13dc2462017-02-14 22:15:29 -0800222 (void)opaque;
223
initial.commit3d533e02008-07-27 00:38:33 +0000224 /* If we allocate less than 65520 bytes, we assume that farmalloc
225 * will return a usable pointer which doesn't have to be normalized.
226 */
227 if (bsize < 65520L) {
228 buf = farmalloc(bsize);
229 if (*(ush*)&buf != 0) return buf;
230 } else {
231 buf = farmalloc(bsize + 16L);
232 }
233 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
234 table[next_ptr].org_ptr = buf;
235
236 /* Normalize the pointer to seg:0 */
237 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
238 *(ush*)&buf = 0;
239 table[next_ptr++].new_ptr = buf;
240 return buf;
241}
242
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000243void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
initial.commit3d533e02008-07-27 00:38:33 +0000244{
245 int n;
mark13dc2462017-02-14 22:15:29 -0800246
247 (void)opaque;
248
initial.commit3d533e02008-07-27 00:38:33 +0000249 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 }
initial.commit3d533e02008-07-27 00:38:33 +0000264 Assert(0, "zcfree: ptr not found");
265}
266
267#endif /* __TURBOC__ */
268
269
270#ifdef M_I86
271/* Microsoft C in 16-bit mode */
272
273# define MY_ZCALLOC
274
275#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
276# define _halloc halloc
277# define _hfree hfree
278#endif
279
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000280voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
initial.commit3d533e02008-07-27 00:38:33 +0000281{
mark13dc2462017-02-14 22:15:29 -0800282 (void)opaque;
initial.commit3d533e02008-07-27 00:38:33 +0000283 return _halloc((long)items, size);
284}
285
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000286void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
initial.commit3d533e02008-07-27 00:38:33 +0000287{
mark13dc2462017-02-14 22:15:29 -0800288 (void)opaque;
initial.commit3d533e02008-07-27 00:38:33 +0000289 _hfree(ptr);
290}
291
292#endif /* M_I86 */
293
294#endif /* SYS16BIT */
295
296
297#ifndef MY_ZCALLOC /* Any system without a special alloc function */
298
299#ifndef STDC
300extern voidp malloc OF((uInt size));
301extern voidp calloc OF((uInt items, uInt size));
302extern void free OF((voidpf ptr));
303#endif
304
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000305voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
initial.commit3d533e02008-07-27 00:38:33 +0000306 voidpf opaque;
307 unsigned items;
308 unsigned size;
309{
mark13dc2462017-02-14 22:15:29 -0800310 (void)opaque;
initial.commit3d533e02008-07-27 00:38:33 +0000311 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
312 (voidpf)calloc(items, size);
313}
314
hbono@chromium.orgd2dc2092011-12-12 08:48:38 +0000315void ZLIB_INTERNAL zcfree (opaque, ptr)
initial.commit3d533e02008-07-27 00:38:33 +0000316 voidpf opaque;
317 voidpf ptr;
318{
mark13dc2462017-02-14 22:15:29 -0800319 (void)opaque;
initial.commit3d533e02008-07-27 00:38:33 +0000320 free(ptr);
initial.commit3d533e02008-07-27 00:38:33 +0000321}
322
323#endif /* MY_ZCALLOC */
jiadong.zhu6c142162016-06-22 21:22:18 -0700324
325#endif /* !Z_SOLO */