| 1 | /* zutil.c -- target dependent utility functions for the compression library |
| 2 | * Copyright (C) 1995-2002 Jean-loup Gailly. |
| 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
| 4 | */ |
| 5 | |
| 6 | /* @(#) $Id: zutil.c,v 1.2 2002/03/13 17:45:56 xodnizel Exp $ */ |
| 7 | |
| 8 | #include "zutil.h" |
| 9 | |
| 10 | struct internal_state {int dummy;}; /* for buggy compilers */ |
| 11 | |
| 12 | #ifndef STDC |
| 13 | extern void exit OF((int)); |
| 14 | #endif |
| 15 | |
| 16 | const char *z_errmsg[10] = { |
| 17 | "need dictionary", /* Z_NEED_DICT 2 */ |
| 18 | "stream end", /* Z_STREAM_END 1 */ |
| 19 | "", /* Z_OK 0 */ |
| 20 | "file error", /* Z_ERRNO (-1) */ |
| 21 | "stream error", /* Z_STREAM_ERROR (-2) */ |
| 22 | "data error", /* Z_DATA_ERROR (-3) */ |
| 23 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
| 24 | "buffer error", /* Z_BUF_ERROR (-5) */ |
| 25 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
| 26 | ""}; |
| 27 | |
| 28 | |
| 29 | const char * ZEXPORT zlibVersion() |
| 30 | { |
| 31 | return ZLIB_VERSION; |
| 32 | } |
| 33 | |
| 34 | #ifdef DEBUG |
| 35 | |
| 36 | # ifndef verbose |
| 37 | # define verbose 0 |
| 38 | # endif |
| 39 | int z_verbose = verbose; |
| 40 | |
| 41 | void z_error (m) |
| 42 | char *m; |
| 43 | { |
| 44 | fprintf(stderr, "%s\n", m); |
| 45 | exit(1); |
| 46 | } |
| 47 | #endif |
| 48 | |
| 49 | /* exported to allow conversion of error code to string for compress() and |
| 50 | * uncompress() |
| 51 | */ |
| 52 | const char * ZEXPORT zError(err) |
| 53 | int err; |
| 54 | { |
| 55 | return ERR_MSG(err); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | #ifndef HAVE_MEMCPY |
| 60 | |
| 61 | void zmemcpy(dest, source, len) |
| 62 | Bytef* dest; |
| 63 | const Bytef* source; |
| 64 | uInt len; |
| 65 | { |
| 66 | if (len == 0) return; |
| 67 | do { |
| 68 | *dest++ = *source++; /* ??? to be unrolled */ |
| 69 | } while (--len != 0); |
| 70 | } |
| 71 | |
| 72 | int zmemcmp(s1, s2, len) |
| 73 | const Bytef* s1; |
| 74 | const Bytef* s2; |
| 75 | uInt len; |
| 76 | { |
| 77 | uInt j; |
| 78 | |
| 79 | for (j = 0; j < len; j++) { |
| 80 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
| 81 | } |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | void zmemzero(dest, len) |
| 86 | Bytef* dest; |
| 87 | uInt len; |
| 88 | { |
| 89 | if (len == 0) return; |
| 90 | do { |
| 91 | *dest++ = 0; /* ??? to be unrolled */ |
| 92 | } while (--len != 0); |
| 93 | } |
| 94 | #endif |
| 95 | |
| 96 | #ifdef __TURBOC__ |
| 97 | #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__) |
| 98 | /* Small and medium model in Turbo C are for now limited to near allocation |
| 99 | * with reduced MAX_WBITS and MAX_MEM_LEVEL |
| 100 | */ |
| 101 | # define MY_ZCALLOC |
| 102 | |
| 103 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
| 104 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
| 105 | * must fix the pointer. Warning: the pointer must be put back to its |
| 106 | * original form in order to free it, use zcfree(). |
| 107 | */ |
| 108 | |
| 109 | #define MAX_PTR 10 |
| 110 | /* 10*64K = 640K */ |
| 111 | |
| 112 | local int next_ptr = 0; |
| 113 | |
| 114 | typedef struct ptr_table_s { |
| 115 | voidpf org_ptr; |
| 116 | voidpf new_ptr; |
| 117 | } ptr_table; |
| 118 | |
| 119 | local ptr_table table[MAX_PTR]; |
| 120 | /* This table is used to remember the original form of pointers |
| 121 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
| 122 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
| 123 | * protected from concurrent access. This hack doesn't work anyway on |
| 124 | * a protected system like OS/2. Use Microsoft C instead. |
| 125 | */ |
| 126 | |
| 127 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
| 128 | { |
| 129 | voidpf buf = opaque; /* just to make some compilers happy */ |
| 130 | ulg bsize = (ulg)items*size; |
| 131 | |
| 132 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
| 133 | * will return a usable pointer which doesn't have to be normalized. |
| 134 | */ |
| 135 | if (bsize < 65520L) { |
| 136 | buf = farmalloc(bsize); |
| 137 | if (*(ush*)&buf != 0) return buf; |
| 138 | } else { |
| 139 | buf = farmalloc(bsize + 16L); |
| 140 | } |
| 141 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
| 142 | table[next_ptr].org_ptr = buf; |
| 143 | |
| 144 | /* Normalize the pointer to seg:0 */ |
| 145 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
| 146 | *(ush*)&buf = 0; |
| 147 | table[next_ptr++].new_ptr = buf; |
| 148 | return buf; |
| 149 | } |
| 150 | |
| 151 | void zcfree (voidpf opaque, voidpf ptr) |
| 152 | { |
| 153 | int n; |
| 154 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
| 155 | farfree(ptr); |
| 156 | return; |
| 157 | } |
| 158 | /* Find the original pointer */ |
| 159 | for (n = 0; n < next_ptr; n++) { |
| 160 | if (ptr != table[n].new_ptr) continue; |
| 161 | |
| 162 | farfree(table[n].org_ptr); |
| 163 | while (++n < next_ptr) { |
| 164 | table[n-1] = table[n]; |
| 165 | } |
| 166 | next_ptr--; |
| 167 | return; |
| 168 | } |
| 169 | ptr = opaque; /* just to make some compilers happy */ |
| 170 | Assert(0, "zcfree: ptr not found"); |
| 171 | } |
| 172 | #endif |
| 173 | #endif /* __TURBOC__ */ |
| 174 | |
| 175 | |
| 176 | #if defined(M_I86) && !defined(__32BIT__) |
| 177 | /* Microsoft C in 16-bit mode */ |
| 178 | |
| 179 | # define MY_ZCALLOC |
| 180 | |
| 181 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
| 182 | # define _halloc halloc |
| 183 | # define _hfree hfree |
| 184 | #endif |
| 185 | |
| 186 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
| 187 | { |
| 188 | if (opaque) opaque = 0; /* to make compiler happy */ |
| 189 | return _halloc((long)items, size); |
| 190 | } |
| 191 | |
| 192 | void zcfree (voidpf opaque, voidpf ptr) |
| 193 | { |
| 194 | if (opaque) opaque = 0; /* to make compiler happy */ |
| 195 | _hfree(ptr); |
| 196 | } |
| 197 | |
| 198 | #endif /* MSC */ |
| 199 | |
| 200 | |
| 201 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
| 202 | |
| 203 | #ifndef STDC |
| 204 | extern voidp calloc OF((uInt items, uInt size)); |
| 205 | extern void free OF((voidpf ptr)); |
| 206 | #endif |
| 207 | |
| 208 | voidpf zcalloc (opaque, items, size) |
| 209 | voidpf opaque; |
| 210 | unsigned items; |
| 211 | unsigned size; |
| 212 | { |
| 213 | if (opaque) items += size - size; /* make compiler happy */ |
| 214 | return (voidpf)calloc(items, size); |
| 215 | } |
| 216 | |
| 217 | void zcfree (opaque, ptr) |
| 218 | voidpf opaque; |
| 219 | voidpf ptr; |
| 220 | { |
| 221 | free(ptr); |
| 222 | if (opaque) return; /* make compiler happy */ |
| 223 | } |
| 224 | |
| 225 | #endif /* MY_ZCALLOC */ |