Ruby: ext/zlib/zlib-1.2.13/zutil.c Source File

Ruby 3.0.5p211 (2022-11-24 revision ba5cf0f7c52d4d35cc6a173c89eda98ceffa2dcf)

zutil.c
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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
64 /*
65#if defined(ASMV) || defined(ASMINF)
66 flags += 1 << 9;
67#endif
68 */
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
122int ZLIB_INTERNAL z_verbose = verbose;
123
124void ZLIB_INTERNAL z_error(m)
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
141#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
142 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
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
151void 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
162int 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
175void 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
206typedef 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
219 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
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
245void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
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
282 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size)
283{
284 (void)opaque;
285 return _halloc((long)items, size);
286}
287
288void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
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
302extern voidp malloc OF((uInt size));
303extern voidp calloc OF((uInt items, uInt size));
304extern void free OF((voidpf ptr));
305#endif
306
307 voidpf ZLIB_INTERNAL zcalloc(opaque, items, size)
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
317 void ZLIB_INTERNAL zcfree(opaque, ptr)
318 voidpf opaque;
319 voidpf ptr;
320{
321 (void)opaque;
322 free(ptr);
323}
324
325#endif /* MY_ZCALLOC */
326
327#endif /* !Z_SOLO */
local
#define local
Definition: blast.c:36
ZLIB_INTERNAL
#define ZLIB_INTERNAL
Definition: compress.c:8
ptr
struct RIMemo * ptr
Definition: debug.c:88
free
#define free(x)
Definition: dln.c:52
len
uint8_t len
Definition: escape.c:17
gzguts.h
size
voidpf void uLong size
Definition: ioapi.h:138
buf
voidpf void * buf
Definition: ioapi.h:138
NULL
#define NULL
Definition: regenc.h:69
calloc
#define calloc
Definition: st.c:171
malloc
#define malloc
Definition: st.c:170
err
int err
Definition: win32.c:142
uLong
unsigned long uLong
Definition: zconf.h:400
ZEXPORT
#define ZEXPORT
Definition: zconf.h:386
voidpf
void FAR * voidpf
Definition: zconf.h:415
uInt
unsigned int uInt
Definition: zconf.h:399
z_off_t
#define z_off_t
Definition: zconf.h:517
z_const
#define z_const
Definition: zconf.h:240
OF
#define OF(args)
Definition: zconf.h:293
Bytef
Byte FAR Bytef
Definition: zconf.h:406
voidp
void * voidp
Definition: zconf.h:416
ZLIB_VERSION
#define ZLIB_VERSION
Definition: zlib.h:40
zcfree
void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
Definition: zutil.c:317
zcalloc
voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
Definition: zutil.c:307
zlibVersion
const char *ZEXPORT zlibVersion()
Definition: zutil.c:27
z_errmsg
z_const char *const z_errmsg[10]
Definition: zutil.c:13
zlibCompileFlags
uLong ZEXPORT zlibCompileFlags()
Definition: zutil.c:32
zError
const char *ZEXPORT zError(int err)
Definition: zutil.c:135
zutil.h
zmemcmp
#define zmemcmp
Definition: zutil.h:231
zmemzero
#define zmemzero(dest, len)
Definition: zutil.h:232
zmemcpy
#define zmemcpy
Definition: zutil.h:230
ush
unsigned short ush
Definition: zutil.h:41
Assert
#define Assert(cond, msg)
Definition: zutil.h:252
ERR_MSG
#define ERR_MSG(err)
Definition: zutil.h:59
ulg
unsigned long ulg
Definition: zutil.h:43
uch
unsigned char uch
Definition: zutil.h:39