[562] | 1 | /* zutil.c -- target dependent utility functions for the compression library |
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| 2 | * Copyright (C) 1995-2003 Jean-loup Gailly. |
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| 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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| 4 | */ |
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| 5 | |
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| 6 | /* @(#) $Id: zutil.cc,v 1.1 2005/05/12 21:04:53 duns Exp $ */ |
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| 7 | |
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| 8 | #include "zutil.h" |
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| 9 | |
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| 10 | #ifndef NO_DUMMY_DECL |
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| 11 | struct internal_state {int dummy;}; /* for buggy compilers */ |
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| 12 | #endif |
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| 13 | |
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| 14 | #ifndef STDC |
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| 15 | extern void exit OF((int)); |
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| 16 | #endif |
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| 17 | |
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| 18 | const char * const z_errmsg[10] = { |
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| 19 | "need dictionary", /* Z_NEED_DICT 2 */ |
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| 20 | "stream end", /* Z_STREAM_END 1 */ |
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| 21 | "", /* Z_OK 0 */ |
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| 22 | "file error", /* Z_ERRNO (-1) */ |
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| 23 | "stream error", /* Z_STREAM_ERROR (-2) */ |
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| 24 | "data error", /* Z_DATA_ERROR (-3) */ |
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| 25 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
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| 26 | "buffer error", /* Z_BUF_ERROR (-5) */ |
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| 27 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
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| 28 | ""}; |
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| 29 | |
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| 30 | |
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| 31 | const char * ZEXPORT zlibVersion() |
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| 32 | { |
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| 33 | return ZLIB_VERSION; |
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| 34 | } |
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| 35 | |
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| 36 | uLong ZEXPORT zlibCompileFlags() |
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| 37 | { |
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| 38 | uLong flags; |
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| 39 | |
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| 40 | flags = 0; |
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| 41 | switch (sizeof(uInt)) { |
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| 42 | case 2: break; |
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| 43 | case 4: flags += 1; break; |
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| 44 | case 8: flags += 2; break; |
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| 45 | default: flags += 3; |
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| 46 | } |
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| 47 | switch (sizeof(uLong)) { |
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| 48 | case 2: break; |
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| 49 | case 4: flags += 1 << 2; break; |
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| 50 | case 8: flags += 2 << 2; break; |
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| 51 | default: flags += 3 << 2; |
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| 52 | } |
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| 53 | switch (sizeof(voidpf)) { |
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| 54 | case 2: break; |
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| 55 | case 4: flags += 1 << 4; break; |
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| 56 | case 8: flags += 2 << 4; break; |
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| 57 | default: flags += 3 << 4; |
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| 58 | } |
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| 59 | switch (sizeof(z_off_t)) { |
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| 60 | case 2: break; |
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| 61 | case 4: flags += 1 << 6; break; |
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| 62 | case 8: flags += 2 << 6; break; |
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| 63 | default: flags += 3 << 6; |
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| 64 | } |
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| 65 | #ifdef DEBUG |
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| 66 | flags += 1 << 8; |
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| 67 | #endif |
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| 68 | #if defined(ASMV) || defined(ASMINF) |
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| 69 | flags += 1 << 9; |
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| 70 | #endif |
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| 71 | #ifdef ZLIB_WINAPI |
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| 72 | flags += 1 << 10; |
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| 73 | #endif |
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| 74 | #ifdef BUILDFIXED |
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| 75 | flags += 1 << 12; |
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| 76 | #endif |
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| 77 | #ifdef DYNAMIC_CRC_TABLE |
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| 78 | flags += 1 << 13; |
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| 79 | #endif |
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| 80 | #ifdef NO_GZCOMPRESS |
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| 81 | flags += 1 << 16; |
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| 82 | #endif |
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| 83 | #ifdef NO_GZIP |
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| 84 | flags += 1 << 17; |
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| 85 | #endif |
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| 86 | #ifdef PKZIP_BUG_WORKAROUND |
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| 87 | flags += 1 << 20; |
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| 88 | #endif |
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| 89 | #ifdef FASTEST |
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| 90 | flags += 1 << 21; |
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| 91 | #endif |
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| 92 | #ifdef STDC |
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| 93 | # ifdef NO_vsnprintf |
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| 94 | flags += 1 << 25; |
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| 95 | # ifdef HAS_vsprintf_void |
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| 96 | flags += 1 << 26; |
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| 97 | # endif |
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| 98 | # else |
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| 99 | # ifdef HAS_vsnprintf_void |
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| 100 | flags += 1 << 26; |
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| 101 | # endif |
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| 102 | # endif |
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| 103 | #else |
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| 104 | flags += 1 << 24; |
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| 105 | # ifdef NO_snprintf |
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| 106 | flags += 1 << 25; |
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| 107 | # ifdef HAS_sprintf_void |
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| 108 | flags += 1 << 26; |
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| 109 | # endif |
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| 110 | # else |
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| 111 | # ifdef HAS_snprintf_void |
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| 112 | flags += 1 << 26; |
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| 113 | # endif |
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| 114 | # endif |
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| 115 | #endif |
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| 116 | return flags; |
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| 117 | } |
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| 118 | |
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| 119 | #ifdef DEBUG |
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| 120 | |
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| 121 | # ifndef verbose |
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| 122 | # define verbose 0 |
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| 123 | # endif |
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| 124 | int z_verbose = verbose; |
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| 125 | |
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| 126 | void z_error (char *m) |
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| 127 | { |
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| 128 | fprintf(stderr, "%s\n", m); |
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| 129 | exit(1); |
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| 130 | } |
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| 131 | #endif |
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| 132 | |
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| 133 | /* exported to allow conversion of error code to string for compress() and |
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| 134 | * uncompress() |
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| 135 | */ |
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| 136 | const char * ZEXPORT zError(int err) |
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| 137 | { |
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| 138 | return ERR_MSG(err); |
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| 139 | } |
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| 140 | |
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| 141 | #if defined(_WIN32_WCE) |
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| 142 | /* does not exist on WCE */ |
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| 143 | int errno = 0; |
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| 144 | #endif |
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| 145 | |
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| 146 | #ifndef HAVE_MEMCPY |
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| 147 | |
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| 148 | void zmemcpy(Bytef *dest, const Bytef *source, uInt len) |
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| 149 | { |
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| 150 | if (len == 0) return; |
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| 151 | do { |
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| 152 | *dest++ = *source++; /* ??? to be unrolled */ |
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| 153 | } while (--len != 0); |
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| 154 | } |
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| 155 | |
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| 156 | int zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) |
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| 157 | { |
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| 158 | uInt j; |
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| 159 | |
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| 160 | for (j = 0; j < len; j++) { |
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| 161 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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| 162 | } |
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| 163 | return 0; |
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| 164 | } |
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| 165 | |
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| 166 | void zmemzero(Bytef *dest, uInt len) |
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| 167 | { |
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| 168 | if (len == 0) return; |
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| 169 | do { |
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| 170 | *dest++ = 0; /* ??? to be unrolled */ |
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| 171 | } while (--len != 0); |
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| 172 | } |
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| 173 | #endif |
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| 174 | |
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| 175 | |
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| 176 | #ifdef SYS16BIT |
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| 177 | |
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| 178 | #ifdef __TURBOC__ |
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| 179 | /* Turbo C in 16-bit mode */ |
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| 180 | |
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| 181 | # define MY_ZCALLOC |
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| 182 | |
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| 183 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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| 184 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
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| 185 | * must fix the pointer. Warning: the pointer must be put back to its |
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| 186 | * original form in order to free it, use zcfree(). |
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| 187 | */ |
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| 188 | |
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| 189 | #define MAX_PTR 10 |
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| 190 | /* 10*64K = 640K */ |
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| 191 | |
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| 192 | local int next_ptr = 0; |
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| 193 | |
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| 194 | typedef struct ptr_table_s { |
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| 195 | voidpf org_ptr; |
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| 196 | voidpf new_ptr; |
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| 197 | } ptr_table; |
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| 198 | |
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| 199 | local ptr_table table[MAX_PTR]; |
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| 200 | /* This table is used to remember the original form of pointers |
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| 201 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
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| 202 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
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| 203 | * protected from concurrent access. This hack doesn't work anyway on |
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| 204 | * a protected system like OS/2. Use Microsoft C instead. |
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| 205 | */ |
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| 206 | |
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| 207 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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| 208 | { |
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| 209 | voidpf buf = opaque; /* just to make some compilers happy */ |
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| 210 | ulg bsize = (ulg)items*size; |
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| 211 | |
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| 212 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
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| 213 | * will return a usable pointer which doesn't have to be normalized. |
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| 214 | */ |
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| 215 | if (bsize < 65520L) { |
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| 216 | buf = farmalloc(bsize); |
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| 217 | if (*(ush*)&buf != 0) return buf; |
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| 218 | } else { |
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| 219 | buf = farmalloc(bsize + 16L); |
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| 220 | } |
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| 221 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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| 222 | table[next_ptr].org_ptr = buf; |
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| 223 | |
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| 224 | /* Normalize the pointer to seg:0 */ |
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| 225 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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| 226 | *(ush*)&buf = 0; |
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| 227 | table[next_ptr++].new_ptr = buf; |
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| 228 | return buf; |
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| 229 | } |
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| 230 | |
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| 231 | void zcfree (voidpf opaque, voidpf ptr) |
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| 232 | { |
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| 233 | int n; |
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| 234 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
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| 235 | farfree(ptr); |
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| 236 | return; |
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| 237 | } |
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| 238 | /* Find the original pointer */ |
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| 239 | for (n = 0; n < next_ptr; n++) { |
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| 240 | if (ptr != table[n].new_ptr) continue; |
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| 241 | |
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| 242 | farfree(table[n].org_ptr); |
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| 243 | while (++n < next_ptr) { |
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| 244 | table[n-1] = table[n]; |
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| 245 | } |
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| 246 | next_ptr--; |
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| 247 | return; |
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| 248 | } |
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| 249 | ptr = opaque; /* just to make some compilers happy */ |
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| 250 | Assert(0, "zcfree: ptr not found"); |
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| 251 | } |
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| 252 | |
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| 253 | #endif /* __TURBOC__ */ |
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| 254 | |
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| 255 | |
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| 256 | #ifdef M_I86 |
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| 257 | /* Microsoft C in 16-bit mode */ |
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| 258 | |
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| 259 | # define MY_ZCALLOC |
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| 260 | |
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| 261 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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| 262 | # define _halloc halloc |
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| 263 | # define _hfree hfree |
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| 264 | #endif |
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| 265 | |
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| 266 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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| 267 | { |
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| 268 | if (opaque) opaque = 0; /* to make compiler happy */ |
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| 269 | return _halloc((long)items, size); |
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| 270 | } |
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| 271 | |
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| 272 | void zcfree (voidpf opaque, voidpf ptr) |
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| 273 | { |
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| 274 | if (opaque) opaque = 0; /* to make compiler happy */ |
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| 275 | _hfree(ptr); |
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| 276 | } |
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| 277 | |
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| 278 | #endif /* M_I86 */ |
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| 279 | |
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| 280 | #endif /* SYS16BIT */ |
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| 281 | |
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| 282 | |
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| 283 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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| 284 | |
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| 285 | #ifndef STDC |
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| 286 | extern voidp malloc OF((uInt size)); |
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| 287 | extern voidp calloc OF((uInt items, uInt size)); |
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| 288 | extern void free OF((voidpf ptr)); |
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| 289 | #endif |
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| 290 | |
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| 291 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
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| 292 | { |
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| 293 | if (opaque) items += size - size; /* make compiler happy */ |
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| 294 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
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| 295 | (voidpf)calloc(items, size); |
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| 296 | } |
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| 297 | |
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| 298 | void zcfree (voidpf opaque, voidpf ptr) |
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| 299 | { |
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| 300 | free(ptr); |
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| 301 | if (opaque) return; /* make compiler happy */ |
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| 302 | } |
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| 303 | |
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| 304 | #endif /* MY_ZCALLOC */ |
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