1/*	$NetBSD: zutil.c,v 1.4 2022/10/15 19:49:32 christos Exp $	*/
2
3/* zutil.c -- target dependent utility functions for the compression library
4 * Copyright (C) 1995-2017 Jean-loup Gailly
5 * For conditions of distribution and use, see copyright notice in zlib.h
6 */
7
8/* @(#) Id */
9
10#include "zutil.h"
11#ifndef Z_SOLO
12#  include "gzguts.h"
13#endif
14
15z_const char * const z_errmsg[10] = {
16    __UNCONST("need dictionary"),     /* Z_NEED_DICT       2  */
17    __UNCONST("stream end"),          /* Z_STREAM_END      1  */
18    __UNCONST(""),                    /* Z_OK              0  */
19    __UNCONST("file error"),          /* Z_ERRNO         (-1) */
20    __UNCONST("stream error"),        /* Z_STREAM_ERROR  (-2) */
21    __UNCONST("data error"),          /* Z_DATA_ERROR    (-3) */
22    __UNCONST("insufficient memory"), /* Z_MEM_ERROR     (-4) */
23    __UNCONST("buffer error"),        /* Z_BUF_ERROR     (-5) */
24    __UNCONST("incompatible version"),/* Z_VERSION_ERROR (-6) */
25    __UNCONST(""),
26};
27
28
29const char * ZEXPORT zlibVersion()
30{
31    return ZLIB_VERSION;
32}
33
34uLong ZEXPORT zlibCompileFlags()
35{
36    uLong flags;
37
38    flags = 0;
39    switch ((int)(sizeof(uInt))) {
40    case 2:     break;
41    case 4:     flags += 1;     break;
42    case 8:     flags += 2;     break;
43    default:    flags += 3;
44    }
45    switch ((int)(sizeof(uLong))) {
46    case 2:     break;
47    case 4:     flags += 1 << 2;        break;
48    case 8:     flags += 2 << 2;        break;
49    default:    flags += 3 << 2;
50    }
51    switch ((int)(sizeof(voidpf))) {
52    case 2:     break;
53    case 4:     flags += 1 << 4;        break;
54    case 8:     flags += 2 << 4;        break;
55    default:    flags += 3 << 4;
56    }
57    switch ((int)(sizeof(z_off_t))) {
58    case 2:     break;
59    case 4:     flags += 1 << 6;        break;
60    case 8:     flags += 2 << 6;        break;
61    default:    flags += 3 << 6;
62    }
63#ifdef ZLIB_DEBUG
64    flags += 1 << 8;
65#endif
66    /*
67#if defined(ASMV) || defined(ASMINF)
68    flags += 1 << 9;
69#endif
70     */
71#ifdef ZLIB_WINAPI
72    flags += 1 << 10;
73#endif
74#ifdef BUILDFIXED
75    flags += 1 << 12;
76#endif
77#ifdef DYNAMIC_CRC_TABLE
78    flags += 1 << 13;
79#endif
80#ifdef NO_GZCOMPRESS
81    flags += 1L << 16;
82#endif
83#ifdef NO_GZIP
84    flags += 1L << 17;
85#endif
86#ifdef PKZIP_BUG_WORKAROUND
87    flags += 1L << 20;
88#endif
89#ifdef FASTEST
90    flags += 1L << 21;
91#endif
92#if defined(STDC) || defined(Z_HAVE_STDARG_H)
93#  ifdef NO_vsnprintf
94    flags += 1L << 25;
95#    ifdef HAS_vsprintf_void
96    flags += 1L << 26;
97#    endif
98#  else
99#    ifdef HAS_vsnprintf_void
100    flags += 1L << 26;
101#    endif
102#  endif
103#else
104    flags += 1L << 24;
105#  ifdef NO_snprintf
106    flags += 1L << 25;
107#    ifdef HAS_sprintf_void
108    flags += 1L << 26;
109#    endif
110#  else
111#    ifdef HAS_snprintf_void
112    flags += 1L << 26;
113#    endif
114#  endif
115#endif
116    return flags;
117}
118
119#ifdef ZLIB_DEBUG
120#include <stdlib.h>
121#  ifndef verbose
122#    define verbose 0
123#  endif
124int ZLIB_INTERNAL z_verbose = verbose;
125
126void ZLIB_INTERNAL z_error(m)
127    char *m;
128{
129    fprintf(stderr, "%s\n", m);
130    exit(1);
131}
132#endif
133
134/* exported to allow conversion of error code to string for compress() and
135 * uncompress()
136 */
137const char * ZEXPORT zError(err)
138    int err;
139{
140    return ERR_MSG(err);
141}
142
143#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
144    /* The older Microsoft C Run-Time Library for Windows CE doesn't have
145     * errno.  We define it as a global variable to simplify porting.
146     * Its value is always 0 and should not be used.
147     */
148    int errno = 0;
149#endif
150
151#ifndef HAVE_MEMCPY
152
153void ZLIB_INTERNAL zmemcpy(dest, source, len)
154    Bytef* dest;
155    const Bytef* source;
156    uInt  len;
157{
158    if (len == 0) return;
159    do {
160        *dest++ = *source++; /* ??? to be unrolled */
161    } while (--len != 0);
162}
163
164int ZLIB_INTERNAL zmemcmp(s1, s2, len)
165    const Bytef* s1;
166    const Bytef* s2;
167    uInt  len;
168{
169    uInt j;
170
171    for (j = 0; j < len; j++) {
172        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
173    }
174    return 0;
175}
176
177void ZLIB_INTERNAL zmemzero(dest, len)
178    Bytef* dest;
179    uInt  len;
180{
181    if (len == 0) return;
182    do {
183        *dest++ = 0;  /* ??? to be unrolled */
184    } while (--len != 0);
185}
186#endif
187
188#ifndef Z_SOLO
189
190#ifdef SYS16BIT
191
192#ifdef __TURBOC__
193/* Turbo C in 16-bit mode */
194
195#  define MY_ZCALLOC
196
197/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
198 * and farmalloc(64K) returns a pointer with an offset of 8, so we
199 * must fix the pointer. Warning: the pointer must be put back to its
200 * original form in order to free it, use zcfree().
201 */
202
203#define MAX_PTR 10
204/* 10*64K = 640K */
205
206local int next_ptr = 0;
207
208typedef struct ptr_table_s {
209    voidpf org_ptr;
210    voidpf new_ptr;
211} ptr_table;
212
213local ptr_table table[MAX_PTR];
214/* This table is used to remember the original form of pointers
215 * to large buffers (64K). Such pointers are normalized with a zero offset.
216 * Since MSDOS is not a preemptive multitasking OS, this table is not
217 * protected from concurrent access. This hack doesn't work anyway on
218 * a protected system like OS/2. Use Microsoft C instead.
219 */
220
221voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
222{
223    voidpf buf;
224    ulg bsize = (ulg)items*size;
225
226    (void)opaque;
227
228    /* If we allocate less than 65520 bytes, we assume that farmalloc
229     * will return a usable pointer which doesn't have to be normalized.
230     */
231    if (bsize < 65520L) {
232        buf = farmalloc(bsize);
233        if (*(ush*)&buf != 0) return buf;
234    } else {
235        buf = farmalloc(bsize + 16L);
236    }
237    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
238    table[next_ptr].org_ptr = buf;
239
240    /* Normalize the pointer to seg:0 */
241    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
242    *(ush*)&buf = 0;
243    table[next_ptr++].new_ptr = buf;
244    return buf;
245}
246
247void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
248{
249    int n;
250
251    (void)opaque;
252
253    if (*(ush*)&ptr != 0) { /* object < 64K */
254        farfree(ptr);
255        return;
256    }
257    /* Find the original pointer */
258    for (n = 0; n < next_ptr; n++) {
259        if (ptr != table[n].new_ptr) continue;
260
261        farfree(table[n].org_ptr);
262        while (++n < next_ptr) {
263            table[n-1] = table[n];
264        }
265        next_ptr--;
266        return;
267    }
268    Assert(0, "zcfree: ptr not found");
269}
270
271#endif /* __TURBOC__ */
272
273
274#ifdef M_I86
275/* Microsoft C in 16-bit mode */
276
277#  define MY_ZCALLOC
278
279#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
280#  define _halloc  halloc
281#  define _hfree   hfree
282#endif
283
284voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size)
285{
286    (void)opaque;
287    return _halloc((long)items, size);
288}
289
290void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
291{
292    (void)opaque;
293    _hfree(ptr);
294}
295
296#endif /* M_I86 */
297
298#endif /* SYS16BIT */
299
300
301#ifndef MY_ZCALLOC /* Any system without a special alloc function */
302
303#ifndef STDC
304extern voidp  malloc OF((uInt size));
305extern voidp  calloc OF((uInt items, uInt size));
306extern void   free   OF((voidpf ptr));
307#endif
308
309voidpf ZLIB_INTERNAL zcalloc(opaque, items, size)
310    voidpf opaque;
311    unsigned items;
312    unsigned size;
313{
314    (void)opaque;
315    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
316                              (voidpf)calloc(items, size);
317}
318
319void ZLIB_INTERNAL zcfree(opaque, ptr)
320    voidpf opaque;
321    voidpf ptr;
322{
323    (void)opaque;
324    free(ptr);
325}
326
327#endif /* MY_ZCALLOC */
328
329#endif /* !Z_SOLO */
330