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comparison zlib/zutil.c @ 3:5a977ccbc7a9 default tip

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author darius
date Sat, 06 Dec 1997 05:41:29 +0000
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2:fba0b6e6cdc7 3:5a977ccbc7a9
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 05:41:38 darius Exp $ */
7
8 #include <stdio.h>
9
10 #include "zutil.h"
11
12 #ifndef __GO32__
13 extern void exit __P((int));
14 #endif
15
16 char *zlib_version = ZLIB_VERSION;
17
18 char *z_errmsg[] = {
19 "stream end", /* Z_STREAM_END 1 */
20 "", /* Z_OK 0 */
21 "file error", /* Z_ERRNO (-1) */
22 "stream error", /* Z_STREAM_ERROR (-2) */
23 "data error", /* Z_DATA_ERROR (-3) */
24 "insufficient memory", /* Z_MEM_ERROR (-4) */
25 "buffer error", /* Z_BUF_ERROR (-5) */
26 ""};
27
28
29 void z_error (m)
30 char *m;
31 {
32 fprintf(stderr, "%s\n", m);
33 exit(1);
34 }
35
36 #ifndef HAVE_MEMCPY
37
38 void zmemcpy(dest, source, len)
39 Byte* dest;
40 Byte* source;
41 uInt len;
42 {
43 if (len == 0) return;
44 do {
45 *dest++ = *source++; /* ??? to be unrolled */
46 } while (--len != 0);
47 }
48
49 void zmemzero(dest, len)
50 Byte* dest;
51 uInt len;
52 {
53 if (len == 0) return;
54 do {
55 *dest++ = 0; /* ??? to be unrolled */
56 } while (--len != 0);
57 }
58 #endif
59
60 #if defined(__TURBOC__) && !defined(__SMALL__)
61
62 # define MY_ZCALLOC
63
64 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
65 * and farmalloc(64K) returns a pointer with an offset of 8, so we
66 * must fix the pointer. Warning: the pointer must be put back to its
67 * original form in order to free it, use zcfree().
68 */
69
70 #define MAX_PTR 10
71 /* 10*64K = 640K */
72
73 local int next_ptr = 0;
74
75 typedef struct ptr_table_s {
76 voidp org_ptr;
77 voidp new_ptr;
78 } ptr_table;
79
80 local ptr_table table[MAX_PTR];
81 /* This table is used to remember the original form of pointers
82 * to large buffers (64K). Such pointers are normalized with a zero offset.
83 * Since MSDOS is not a preemptive multitasking OS, this table is not
84 * protected from concurrent access. This hack doesn't work anyway on
85 * a protected system like OS/2. Use Microsoft C instead.
86 */
87
88 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
89 {
90 voidp buf = opaque; /* just to make some compilers happy */
91 ulg bsize = (ulg)items*size;
92
93 if (bsize < 65536L) {
94 buf = farmalloc(bsize);
95 if (*(ush*)&buf != 0) return buf;
96 } else {
97 buf = farmalloc(bsize + 16L);
98 }
99 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
100 table[next_ptr].org_ptr = buf;
101
102 /* Normalize the pointer to seg:0 */
103 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
104 *(ush*)&buf = 0;
105 table[next_ptr++].new_ptr = buf;
106 return buf;
107 }
108
109 void zcfree (voidp opaque, voidp ptr)
110 {
111 int n;
112 if (*(ush*)&ptr != 0) { /* object < 64K */
113 farfree(ptr);
114 return;
115 }
116 /* Find the original pointer */
117 for (n = 0; n < next_ptr; n++) {
118 if (ptr != table[n].new_ptr) continue;
119
120 farfree(table[n].org_ptr);
121 while (++n < next_ptr) {
122 table[n-1] = table[n];
123 }
124 next_ptr--;
125 return;
126 }
127 ptr = opaque; /* just to make some compilers happy */
128 z_error("zcfree: ptr not found");
129 }
130 #endif /* __TURBOC__ */
131
132 #if defined(M_I86CM) || defined(M_I86LM) /* MSC compact or large model */
133
134 # define MY_ZCALLOC
135
136 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
137 # define _halloc halloc
138 # define _hfree hfree
139 #endif
140
141 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
142 {
143 if (opaque) opaque = 0; /* to make compiler happy */
144 return _halloc((long)items, size);
145 }
146
147 void zcfree (voidp opaque, voidp ptr)
148 {
149 if (opaque) opaque = 0; /* to make compiler happy */
150 _hfree(ptr);
151 }
152
153 #endif /* defined(M_I86CM) || defined(M_I86LM) */
154
155
156 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
157
158 #ifndef __GO32__
159 extern voidp calloc __P((uInt items, uInt size));
160 extern void free __P((voidp ptr));
161 #endif
162
163 voidp zcalloc (opaque, items, size)
164 voidp opaque;
165 unsigned items;
166 unsigned size;
167 {
168 return calloc(items, size);
169 }
170
171 void zcfree (opaque, ptr)
172 voidp opaque;
173 voidp ptr;
174 {
175 free(ptr);
176 }
177
178 #endif /* MY_ZCALLOC */