|
10
|
1 /* zutil.c -- target dependent utility functions for the compression library
|
|
|
2 * Copyright (C) 1995 Jean-loup Gailly.
|
|
|
3 * For conditions of distribution and use, see copyright notice in zlib.h
|
|
|
4 */
|
|
|
5
|
|
|
6 /* $Id: zutil.c,v 1.1.1.1 1997/12/06 04:37:18 darius Exp $ */
|
|
|
7
|
|
|
8 #include <stdio.h>
|
|
|
9
|
|
|
10 #include "zutil.h"
|
|
|
11
|
|
|
12 struct internal_state {int dummy;}; /* for buggy compilers */
|
|
|
13
|
|
|
14 #ifndef __GO32__
|
|
|
15 extern void exit OF((int));
|
|
|
16 #endif
|
|
|
17
|
|
|
18 char *zlib_version = ZLIB_VERSION;
|
|
|
19
|
|
|
20 char *z_errmsg[] = {
|
|
|
21 "stream end", /* Z_STREAM_END 1 */
|
|
|
22 "", /* Z_OK 0 */
|
|
|
23 "file error", /* Z_ERRNO (-1) */
|
|
|
24 "stream error", /* Z_STREAM_ERROR (-2) */
|
|
|
25 "data error", /* Z_DATA_ERROR (-3) */
|
|
|
26 "insufficient memory", /* Z_MEM_ERROR (-4) */
|
|
|
27 "buffer error", /* Z_BUF_ERROR (-5) */
|
|
|
28 ""};
|
|
|
29
|
|
|
30
|
|
|
31 void z_error (m)
|
|
|
32 char *m;
|
|
|
33 {
|
|
|
34 fprintf(stderr, "%s\n", m);
|
|
|
35 exit(1);
|
|
|
36 }
|
|
|
37
|
|
|
38 #ifndef HAVE_MEMCPY
|
|
|
39
|
|
|
40 void zmemcpy(dest, source, len)
|
|
|
41 Bytef* dest;
|
|
|
42 Bytef* source;
|
|
|
43 uInt len;
|
|
|
44 {
|
|
|
45 if (len == 0) return;
|
|
|
46 do {
|
|
|
47 *dest++ = *source++; /* ??? to be unrolled */
|
|
|
48 } while (--len != 0);
|
|
|
49 }
|
|
|
50
|
|
|
51 void zmemzero(dest, len)
|
|
|
52 Bytef* dest;
|
|
|
53 uInt len;
|
|
|
54 {
|
|
|
55 if (len == 0) return;
|
|
|
56 do {
|
|
|
57 *dest++ = 0; /* ??? to be unrolled */
|
|
|
58 } while (--len != 0);
|
|
|
59 }
|
|
|
60 #endif
|
|
|
61
|
|
|
62 #if defined( __TURBOC__) && !defined(__SMALL__) && !defined(__MEDIUM__)
|
|
|
63 /* Small and medium model are for now limited to near allocation with
|
|
|
64 * reduced MAX_WBITS and MAX_MEM_LEVEL
|
|
|
65 */
|
|
|
66 # define MY_ZCALLOC
|
|
|
67
|
|
|
68 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
|
|
|
69 * and farmalloc(64K) returns a pointer with an offset of 8, so we
|
|
|
70 * must fix the pointer. Warning: the pointer must be put back to its
|
|
|
71 * original form in order to free it, use zcfree().
|
|
|
72 */
|
|
|
73
|
|
|
74 #define MAX_PTR 10
|
|
|
75 /* 10*64K = 640K */
|
|
|
76
|
|
|
77 local int next_ptr = 0;
|
|
|
78
|
|
|
79 typedef struct ptr_table_s {
|
|
|
80 voidpf org_ptr;
|
|
|
81 voidpf new_ptr;
|
|
|
82 } ptr_table;
|
|
|
83
|
|
|
84 local ptr_table table[MAX_PTR];
|
|
|
85 /* This table is used to remember the original form of pointers
|
|
|
86 * to large buffers (64K). Such pointers are normalized with a zero offset.
|
|
|
87 * Since MSDOS is not a preemptive multitasking OS, this table is not
|
|
|
88 * protected from concurrent access. This hack doesn't work anyway on
|
|
|
89 * a protected system like OS/2. Use Microsoft C instead.
|
|
|
90 */
|
|
|
91
|
|
|
92 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
|
|
|
93 {
|
|
|
94 voidpf buf = opaque; /* just to make some compilers happy */
|
|
|
95 ulg bsize = (ulg)items*size;
|
|
|
96
|
|
|
97 if (bsize < 65536L) {
|
|
|
98 buf = farmalloc(bsize);
|
|
|
99 if (*(ush*)&buf != 0) return buf;
|
|
|
100 } else {
|
|
|
101 buf = farmalloc(bsize + 16L);
|
|
|
102 }
|
|
|
103 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
|
|
|
104 table[next_ptr].org_ptr = buf;
|
|
|
105
|
|
|
106 /* Normalize the pointer to seg:0 */
|
|
|
107 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
|
|
|
108 *(ush*)&buf = 0;
|
|
|
109 table[next_ptr++].new_ptr = buf;
|
|
|
110 return buf;
|
|
|
111 }
|
|
|
112
|
|
|
113 void zcfree (voidpf opaque, voidpf ptr)
|
|
|
114 {
|
|
|
115 int n;
|
|
|
116 if (*(ush*)&ptr != 0) { /* object < 64K */
|
|
|
117 farfree(ptr);
|
|
|
118 return;
|
|
|
119 }
|
|
|
120 /* Find the original pointer */
|
|
|
121 for (n = 0; n < next_ptr; n++) {
|
|
|
122 if (ptr != table[n].new_ptr) continue;
|
|
|
123
|
|
|
124 farfree(table[n].org_ptr);
|
|
|
125 while (++n < next_ptr) {
|
|
|
126 table[n-1] = table[n];
|
|
|
127 }
|
|
|
128 next_ptr--;
|
|
|
129 return;
|
|
|
130 }
|
|
|
131 ptr = opaque; /* just to make some compilers happy */
|
|
|
132 z_error("zcfree: ptr not found");
|
|
|
133 }
|
|
|
134 #endif /* __TURBOC__ */
|
|
|
135
|
|
|
136 #if defined(M_I86SM)||defined(M_I86MM)||defined(M_I86CM)||defined(M_I86LM)
|
|
|
137 /* Microsoft C */
|
|
|
138
|
|
|
139 # define MY_ZCALLOC
|
|
|
140
|
|
|
141 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
|
|
|
142 # define _halloc halloc
|
|
|
143 # define _hfree hfree
|
|
|
144 #endif
|
|
|
145
|
|
|
146 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
|
|
|
147 {
|
|
|
148 if (opaque) opaque = 0; /* to make compiler happy */
|
|
|
149 return _halloc((long)items, size);
|
|
|
150 }
|
|
|
151
|
|
|
152 void zcfree (voidpf opaque, voidpf ptr)
|
|
|
153 {
|
|
|
154 if (opaque) opaque = 0; /* to make compiler happy */
|
|
|
155 _hfree(ptr);
|
|
|
156 }
|
|
|
157
|
|
|
158 #endif /* MSC */
|
|
|
159
|
|
|
160
|
|
|
161 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
|
|
|
162
|
|
|
163 #ifndef __GO32__
|
|
|
164 extern voidp calloc OF((uInt items, uInt size));
|
|
|
165 extern void free OF((voidpf ptr));
|
|
|
166 #endif
|
|
|
167
|
|
|
168 voidpf zcalloc (opaque, items, size)
|
|
|
169 voidpf opaque;
|
|
|
170 unsigned items;
|
|
|
171 unsigned size;
|
|
|
172 {
|
|
|
173 return (voidpf)calloc(items, size);
|
|
|
174 }
|
|
|
175
|
|
|
176 void zcfree (opaque, ptr)
|
|
|
177 voidpf opaque;
|
|
|
178 voidpf ptr;
|
|
|
179 {
|
|
|
180 free(ptr);
|
|
|
181 }
|
|
|
182
|
|
|
183 #endif /* MY_ZCALLOC */
|
