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
13z_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
27const char * ZEXPORT zlibVersion()
28{
29    return ZLIB_VERSION;
30}
31
32uLong 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#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#if defined(STDC) || defined(Z_HAVE_STDARG_H)
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#include <stdlib.h>
117#  ifndef verbose
118#    define verbose 0
119#  endif
120int ZLIB_INTERNAL z_verbose = verbose;
121
122void ZLIB_INTERNAL 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 */
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     */
144    int errno = 0;
145#endif
146
147#ifndef HAVE_MEMCPY
148
149void ZLIB_INTERNAL 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
160int ZLIB_INTERNAL 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
173void ZLIB_INTERNAL 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#ifndef Z_SOLO
185
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
217voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
218{
219    voidpf buf;
220    ulg bsize = (ulg)items*size;
221
222    (void)opaque;
223
224    /* 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
243void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
244{
245    int n;
246
247    (void)opaque;
248
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    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
280voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
281{
282    (void)opaque;
283    return _halloc((long)items, size);
284}
285
286void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
287{
288    (void)opaque;
289    _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
305voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
306    voidpf opaque;
307    unsigned items;
308    unsigned size;
309{
310    (void)opaque;
311    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
312                              (voidpf)calloc(items, size);
313}
314
315void ZLIB_INTERNAL zcfree (opaque, ptr)
316    voidpf opaque;
317    voidpf ptr;
318{
319    (void)opaque;
320    free(ptr);
321}
322
323#endif /* MY_ZCALLOC */
324
325#endif /* !Z_SOLO */
326