source/modules/juce_core/zip/zlib/zutil.c

   1 /* zutil.c -- target dependent utility functions for the compression library
   2  * Copyright (C) 1995-2005 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 2007/06/07 17:54:37 jules_rms Exp $ */
   7
   8 #include "zutil.h"
   9
  10 #ifndef NO_DUMMY_DECL
  11 struct internal_state      {int dummy;}; /* for buggy compilers */
  12 #endif
  13
  14 const char * const z_errmsg[10] = {
  15 "need dictionary",     /* Z_NEED_DICT       2  */
  16 "stream end",          /* Z_STREAM_END      1  */
  17 "",                    /* Z_OK              0  */
  18 "file error",          /* Z_ERRNO         (-1) */
  19 "stream error",        /* Z_STREAM_ERROR  (-2) */
  20 "data error",          /* Z_DATA_ERROR    (-3) */
  21 "insufficient memory", /* Z_MEM_ERROR     (-4) */
  22 "buffer error",        /* Z_BUF_ERROR     (-5) */
  23 "incompatible version",/* Z_VERSION_ERROR (-6) */
  24 ""};
  25
  26
  27 /*const char * ZEXPORT zlibVersion()
  28 {
  29     return ZLIB_VERSION;
  30 }
  31
  32 uLong ZEXPORT zlibCompileFlags()
  33 {
  34     uLong flags;
  35
  36     flags = 0;
  37     switch (sizeof(uInt)) {
  38     case 2:     break;
  39     case 4:     flags += 1;     break;
  40     case 8:     flags += 2;     break;
  41     default:    flags += 3;
  42     }
  43     switch (sizeof(uLong)) {
  44     case 2:     break;
  45     case 4:     flags += 1 << 2;        break;
  46     case 8:     flags += 2 << 2;        break;
  47     default:    flags += 3 << 2;
  48     }
  49     switch (sizeof(voidpf)) {
  50     case 2:     break;
  51     case 4:     flags += 1 << 4;        break;
  52     case 8:     flags += 2 << 4;        break;
  53     default:    flags += 3 << 4;
  54     }
  55     switch (sizeof(z_off_t)) {
  56     case 2:     break;
  57     case 4:     flags += 1 << 6;        break;
  58     case 8:     flags += 2 << 6;        break;
  59     default:    flags += 3 << 6;
  60     }
  61 #ifdef DEBUG
  62     flags += 1 << 8;
  63 #endif
  64 #if defined(ASMV) || defined(ASMINF)
  65     flags += 1 << 9;
  66 #endif
  67 #ifdef ZLIB_WINAPI
  68     flags += 1 << 10;
  69 #endif
  70 #ifdef BUILDFIXED
  71     flags += 1 << 12;
  72 #endif
  73 #ifdef DYNAMIC_CRC_TABLE
  74     flags += 1 << 13;
  75 #endif
  76 #ifdef NO_GZCOMPRESS
  77     flags += 1L << 16;
  78 #endif
  79 #ifdef NO_GZIP
  80     flags += 1L << 17;
  81 #endif
  82 #ifdef PKZIP_BUG_WORKAROUND
  83     flags += 1L << 20;
  84 #endif
  85 #ifdef FASTEST
  86     flags += 1L << 21;
  87 #endif
  88 #ifdef STDC
  89 #  ifdef NO_vsnprintf
  90         flags += 1L << 25;
  91 #    ifdef HAS_vsprintf_void
  92         flags += 1L << 26;
  93 #    endif
  94 #  else
  95 #    ifdef HAS_vsnprintf_void
  96         flags += 1L << 26;
  97 #    endif
  98 #  endif
  99 #else
 100         flags += 1L << 24;
 101 #  ifdef NO_snprintf
 102         flags += 1L << 25;
 103 #    ifdef HAS_sprintf_void
 104         flags += 1L << 26;
 105 #    endif
 106 #  else
 107 #    ifdef HAS_snprintf_void
 108         flags += 1L << 26;
 109 #    endif
 110 #  endif
 111 #endif
 112     return flags;
 113 }*/
 114
 115 #if 0
 116
 117 #  ifndef verbose
 118 #    define verbose 0
 119 #  endif
 120 int z_verbose = verbose;
 121
 122 void z_error (const char *m)
 123 {
 124     fprintf(stderr, "%s\n", m);
 125     exit(1);
 126 }
 127 #endif
 128
 129 /* exported to allow conversion of error code to string for compress() and
 130  * uncompress()
 131  */
 132 const char * ZEXPORT zError(int err)
 133 {
 134     return ERR_MSG(err);
 135 }
 136
 137 #if defined(_WIN32_WCE)
 138     /* The Microsoft C Run-Time Library for Windows CE doesn't have
 139      * errno.  We define it as a global variable to simplify porting.
 140      * Its value is always 0 and should not be used.
 141      */
 142     int errno = 0;
 143 #endif
 144
 145 #ifndef HAVE_MEMCPY
 146
 147 void zmemcpy(dest, source, len)
 148     Bytef* dest;
 149     const Bytef* source;
 150     uInt  len;
 151 {
 152     if (len == 0) return;
 153     do {
 154         *dest++ = *source++; /* ??? to be unrolled */
 155     } while (--len != 0);
 156 }
 157
 158 int zmemcmp(s1, s2, len)
 159     const Bytef* s1;
 160     const Bytef* s2;
 161     uInt  len;
 162 {
 163     uInt j;
 164
 165     for (j = 0; j < len; j++) {
 166         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
 167     }
 168     return 0;
 169 }
 170
 171 void zmemzero(dest, len)
 172     Bytef* dest;
 173     uInt  len;
 174 {
 175     if (len == 0) return;
 176     do {
 177         *dest++ = 0;  /* ??? to be unrolled */
 178     } while (--len != 0);
 179 }
 180 #endif
 181
 182
 183 #ifdef SYS16BIT
 184
 185 #ifdef __TURBOC__
 186 /* Turbo C in 16-bit mode */
 187
 188 #  define MY_ZCALLOC
 189
 190 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
 191  * and farmalloc(64K) returns a pointer with an offset of 8, so we
 192  * must fix the pointer. Warning: the pointer must be put back to its
 193  * original form in order to free it, use zcfree().
 194  */
 195
 196 #define MAX_PTR 10
 197 /* 10*64K = 640K */
 198
 199 local int next_ptr = 0;
 200
 201 typedef struct ptr_table_s {
 202     voidpf org_ptr;
 203     voidpf new_ptr;
 204 } ptr_table;
 205
 206 local ptr_table table[MAX_PTR];
 207 /* This table is used to remember the original form of pointers
 208  * to large buffers (64K). Such pointers are normalized with a zero offset.
 209  * Since MSDOS is not a preemptive multitasking OS, this table is not
 210  * protected from concurrent access. This hack doesn't work anyway on
 211  * a protected system like OS/2. Use Microsoft C instead.
 212  */
 213
 214 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 215 {
 216     voidpf buf = opaque; /* just to make some compilers happy */
 217     ulg bsize = (ulg)items*size;
 218
 219     /* If we allocate less than 65520 bytes, we assume that farmalloc
 220      * will return a usable pointer which doesn't have to be normalized.
 221      */
 222     if (bsize < 65520L) {
 223         buf = farmalloc(bsize);
 224         if (*(ush*)&buf != 0) return buf;
 225     } else {
 226         buf = farmalloc(bsize + 16L);
 227     }
 228     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
 229     table[next_ptr].org_ptr = buf;
 230
 231     /* Normalize the pointer to seg:0 */
 232     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
 233     *(ush*)&buf = 0;
 234     table[next_ptr++].new_ptr = buf;
 235     return buf;
 236 }
 237
 238 void  zcfree (voidpf opaque, voidpf ptr)
 239 {
 240     int n;
 241     if (*(ush*)&ptr != 0) { /* object < 64K */
 242         farfree(ptr);
 243         return;
 244     }
 245     /* Find the original pointer */
 246     for (n = 0; n < next_ptr; n++) {
 247         if (ptr != table[n].new_ptr) continue;
 248
 249         farfree(table[n].org_ptr);
 250         while (++n < next_ptr) {
 251             table[n-1] = table[n];
 252         }
 253         next_ptr--;
 254         return;
 255     }
 256     ptr = opaque; /* just to make some compilers happy */
 257     Assert(0, "zcfree: ptr not found");
 258 }
 259
 260 #endif /* __TURBOC__ */
 261
 262
 263 #ifdef M_I86
 264 /* Microsoft C in 16-bit mode */
 265
 266 #  define MY_ZCALLOC
 267
 268 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
 269 #  define _halloc  halloc
 270 #  define _hfree   hfree
 271 #endif
 272
 273 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 274 {
 275     if (opaque) opaque = 0; /* to make compiler happy */
 276     return _halloc((long)items, size);
 277 }
 278
 279 void  zcfree (voidpf opaque, voidpf ptr)
 280 {
 281     if (opaque) opaque = 0; /* to make compiler happy */
 282     _hfree(ptr);
 283 }
 284
 285 #endif /* M_I86 */
 286
 287 #endif /* SYS16BIT */
 288
 289
 290 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
 291
 292 #ifndef STDC
 293 extern voidp  malloc OF((uInt size));
 294 extern voidp  calloc OF((uInt items, uInt size));
 295 extern void   free   OF((voidpf ptr));
 296 #endif
 297
 298 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 299 {
 300     if (opaque) items += size - size; /* make compiler happy */
 301     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
 302                               (voidpf)calloc(items, size);
 303 }
 304
 305 void  zcfree (voidpf opaque, voidpf ptr)
 306 {
 307     free(ptr);
 308     if (opaque) return; /* make compiler happy */
 309 }
 310
 311 #endif /* MY_ZCALLOC */