symbian-qemu-0.9.1-12/zlib-1.2.3/zutil.c
changeset 1 2fb8b9db1c86
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0:ffa851df0825 1:2fb8b9db1c86
       
     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 /* @(#) $Id$ */
       
     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 #ifdef DEBUG
       
   116 
       
   117 #  ifndef verbose
       
   118 #    define verbose 0
       
   119 #  endif
       
   120 int z_verbose = verbose;
       
   121 
       
   122 void z_error (m)
       
   123     char *m;
       
   124 {
       
   125     fprintf(stderr, "%s\n", m);
       
   126     exit(1);
       
   127 }
       
   128 #endif
       
   129 
       
   130 /* exported to allow conversion of error code to string for compress() and
       
   131  * uncompress()
       
   132  */
       
   133 const char * ZEXPORT zError(err)
       
   134     int err;
       
   135 {
       
   136     return ERR_MSG(err);
       
   137 }
       
   138 
       
   139 #if defined(_WIN32_WCE)
       
   140     /* The Microsoft C Run-Time Library for Windows CE doesn't have
       
   141      * errno.  We define it as a global variable to simplify porting.
       
   142      * Its value is always 0 and should not be used.
       
   143      */
       
   144     int errno = 0;
       
   145 #endif
       
   146 
       
   147 #ifndef HAVE_MEMCPY
       
   148 
       
   149 void zmemcpy(dest, source, len)
       
   150     Bytef* dest;
       
   151     const Bytef* source;
       
   152     uInt  len;
       
   153 {
       
   154     if (len == 0) return;
       
   155     do {
       
   156         *dest++ = *source++; /* ??? to be unrolled */
       
   157     } while (--len != 0);
       
   158 }
       
   159 
       
   160 int zmemcmp(s1, s2, len)
       
   161     const Bytef* s1;
       
   162     const Bytef* s2;
       
   163     uInt  len;
       
   164 {
       
   165     uInt j;
       
   166 
       
   167     for (j = 0; j < len; j++) {
       
   168         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
       
   169     }
       
   170     return 0;
       
   171 }
       
   172 
       
   173 void zmemzero(dest, len)
       
   174     Bytef* dest;
       
   175     uInt  len;
       
   176 {
       
   177     if (len == 0) return;
       
   178     do {
       
   179         *dest++ = 0;  /* ??? to be unrolled */
       
   180     } while (--len != 0);
       
   181 }
       
   182 #endif
       
   183 
       
   184 
       
   185 #ifdef SYS16BIT
       
   186 
       
   187 #ifdef __TURBOC__
       
   188 /* Turbo C in 16-bit mode */
       
   189 
       
   190 #  define MY_ZCALLOC
       
   191 
       
   192 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
       
   193  * and farmalloc(64K) returns a pointer with an offset of 8, so we
       
   194  * must fix the pointer. Warning: the pointer must be put back to its
       
   195  * original form in order to free it, use zcfree().
       
   196  */
       
   197 
       
   198 #define MAX_PTR 10
       
   199 /* 10*64K = 640K */
       
   200 
       
   201 local int next_ptr = 0;
       
   202 
       
   203 typedef struct ptr_table_s {
       
   204     voidpf org_ptr;
       
   205     voidpf new_ptr;
       
   206 } ptr_table;
       
   207 
       
   208 local ptr_table table[MAX_PTR];
       
   209 /* This table is used to remember the original form of pointers
       
   210  * to large buffers (64K). Such pointers are normalized with a zero offset.
       
   211  * Since MSDOS is not a preemptive multitasking OS, this table is not
       
   212  * protected from concurrent access. This hack doesn't work anyway on
       
   213  * a protected system like OS/2. Use Microsoft C instead.
       
   214  */
       
   215 
       
   216 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
       
   217 {
       
   218     voidpf buf = opaque; /* just to make some compilers happy */
       
   219     ulg bsize = (ulg)items*size;
       
   220 
       
   221     /* If we allocate less than 65520 bytes, we assume that farmalloc
       
   222      * will return a usable pointer which doesn't have to be normalized.
       
   223      */
       
   224     if (bsize < 65520L) {
       
   225         buf = farmalloc(bsize);
       
   226         if (*(ush*)&buf != 0) return buf;
       
   227     } else {
       
   228         buf = farmalloc(bsize + 16L);
       
   229     }
       
   230     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
       
   231     table[next_ptr].org_ptr = buf;
       
   232 
       
   233     /* Normalize the pointer to seg:0 */
       
   234     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
       
   235     *(ush*)&buf = 0;
       
   236     table[next_ptr++].new_ptr = buf;
       
   237     return buf;
       
   238 }
       
   239 
       
   240 void  zcfree (voidpf opaque, voidpf ptr)
       
   241 {
       
   242     int n;
       
   243     if (*(ush*)&ptr != 0) { /* object < 64K */
       
   244         farfree(ptr);
       
   245         return;
       
   246     }
       
   247     /* Find the original pointer */
       
   248     for (n = 0; n < next_ptr; n++) {
       
   249         if (ptr != table[n].new_ptr) continue;
       
   250 
       
   251         farfree(table[n].org_ptr);
       
   252         while (++n < next_ptr) {
       
   253             table[n-1] = table[n];
       
   254         }
       
   255         next_ptr--;
       
   256         return;
       
   257     }
       
   258     ptr = opaque; /* just to make some compilers happy */
       
   259     Assert(0, "zcfree: ptr not found");
       
   260 }
       
   261 
       
   262 #endif /* __TURBOC__ */
       
   263 
       
   264 
       
   265 #ifdef M_I86
       
   266 /* Microsoft C in 16-bit mode */
       
   267 
       
   268 #  define MY_ZCALLOC
       
   269 
       
   270 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
       
   271 #  define _halloc  halloc
       
   272 #  define _hfree   hfree
       
   273 #endif
       
   274 
       
   275 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
       
   276 {
       
   277     if (opaque) opaque = 0; /* to make compiler happy */
       
   278     return _halloc((long)items, size);
       
   279 }
       
   280 
       
   281 void  zcfree (voidpf opaque, voidpf ptr)
       
   282 {
       
   283     if (opaque) opaque = 0; /* to make compiler happy */
       
   284     _hfree(ptr);
       
   285 }
       
   286 
       
   287 #endif /* M_I86 */
       
   288 
       
   289 #endif /* SYS16BIT */
       
   290 
       
   291 
       
   292 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
       
   293 
       
   294 #ifndef STDC
       
   295 extern voidp  malloc OF((uInt size));
       
   296 extern voidp  calloc OF((uInt items, uInt size));
       
   297 extern void   free   OF((voidpf ptr));
       
   298 #endif
       
   299 
       
   300 voidpf zcalloc (opaque, items, size)
       
   301     voidpf opaque;
       
   302     unsigned items;
       
   303     unsigned size;
       
   304 {
       
   305     if (opaque) items += size - size; /* make compiler happy */
       
   306     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
       
   307                               (voidpf)calloc(items, size);
       
   308 }
       
   309 
       
   310 void  zcfree (opaque, ptr)
       
   311     voidpf opaque;
       
   312     voidpf ptr;
       
   313 {
       
   314     free(ptr);
       
   315     if (opaque) return; /* make compiler happy */
       
   316 }
       
   317 
       
   318 #endif /* MY_ZCALLOC */