The Tor Browser: modules/zlib/src/zutil.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* zutil.c -- target dependent utility functions for the compression library

     2  * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly.

     3  * For conditions of distribution and use, see copyright notice in zlib.h

     4  */

     6 /* @(#) $Id$ */

     8 #include "zutil.h"

     9 #ifndef Z_SOLO

    10 #  include "gzguts.h"

    11 #endif

    13 #ifndef NO_DUMMY_DECL

    14 struct internal_state      {int dummy;}; /* for buggy compilers */

    15 #endif

    17 z_const char * const z_errmsg[10] = {

    18 "need dictionary",     /* Z_NEED_DICT       2  */

    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 "incompatible version",/* Z_VERSION_ERROR (-6) */

    27 ""};

    30 const char * ZEXPORT zlibVersion()

    31 {

    32     return ZLIB_VERSION;

    33 }

    35 uLong ZEXPORT zlibCompileFlags()

    36 {

    37     uLong flags;

    39     flags = 0;

    40     switch ((int)(sizeof(uInt))) {

    41     case 2:     break;

    42     case 4:     flags += 1;     break;

    43     case 8:     flags += 2;     break;

    44     default:    flags += 3;

    45     }

    46     switch ((int)(sizeof(uLong))) {

    47     case 2:     break;

    48     case 4:     flags += 1 << 2;        break;

    49     case 8:     flags += 2 << 2;        break;

    50     default:    flags += 3 << 2;

    51     }

    52     switch ((int)(sizeof(voidpf))) {

    53     case 2:     break;

    54     case 4:     flags += 1 << 4;        break;

    55     case 8:     flags += 2 << 4;        break;

    56     default:    flags += 3 << 4;

    57     }

    58     switch ((int)(sizeof(z_off_t))) {

    59     case 2:     break;

    60     case 4:     flags += 1 << 6;        break;

    61     case 8:     flags += 2 << 6;        break;

    62     default:    flags += 3 << 6;

    63     }

    64 #ifdef DEBUG

    65     flags += 1 << 8;

    66 #endif

    67 #if defined(ASMV) || defined(ASMINF)

    68     flags += 1 << 9;

    69 #endif

    70 #ifdef ZLIB_WINAPI

    71     flags += 1 << 10;

    72 #endif

    73 #ifdef BUILDFIXED

    74     flags += 1 << 12;

    75 #endif

    76 #ifdef DYNAMIC_CRC_TABLE

    77     flags += 1 << 13;

    78 #endif

    79 #ifdef NO_GZCOMPRESS

    80     flags += 1L << 16;

    81 #endif

    82 #ifdef NO_GZIP

    83     flags += 1L << 17;

    84 #endif

    85 #ifdef PKZIP_BUG_WORKAROUND

    86     flags += 1L << 20;

    87 #endif

    88 #ifdef FASTEST

    89     flags += 1L << 21;

    90 #endif

    91 #if defined(STDC) || defined(Z_HAVE_STDARG_H)

    92 #  ifdef NO_vsnprintf

    93     flags += 1L << 25;

    94 #    ifdef HAS_vsprintf_void

    95     flags += 1L << 26;

    96 #    endif

    97 #  else

    98 #    ifdef HAS_vsnprintf_void

    99     flags += 1L << 26;

   100 #    endif

   101 #  endif

   102 #else

   103     flags += 1L << 24;

   104 #  ifdef NO_snprintf

   105     flags += 1L << 25;

   106 #    ifdef HAS_sprintf_void

   107     flags += 1L << 26;

   108 #    endif

   109 #  else

   110 #    ifdef HAS_snprintf_void

   111     flags += 1L << 26;

   112 #    endif

   113 #  endif

   114 #endif

   115     return flags;

   116 }

   118 #ifdef DEBUG

   120 #  ifndef verbose

   121 #    define verbose 0

   122 #  endif

   123 int ZLIB_INTERNAL z_verbose = verbose;

   125 void ZLIB_INTERNAL z_error (m)

   126     char *m;

   127 {

   128     fprintf(stderr, "%s\n", m);

   129     exit(1);

   130 }

   131 #endif

   133 /* exported to allow conversion of error code to string for compress() and

   134  * uncompress()

   135  */

   136 const char * ZEXPORT zError(err)

   137     int err;

   138 {

   139     return ERR_MSG(err);

   140 }

   142 #if defined(_WIN32_WCE)

   143     /* The Microsoft C Run-Time Library for Windows CE doesn't have

   144      * errno.  We define it as a global variable to simplify porting.

   145      * Its value is always 0 and should not be used.

   146      */

   147     int errno = 0;

   148 #endif

   150 #ifndef HAVE_MEMCPY

   152 void ZLIB_INTERNAL zmemcpy(dest, source, len)

   153     Bytef* dest;

   154     const Bytef* source;

   155     uInt  len;

   156 {

   157     if (len == 0) return;

   158     do {

   159         *dest++ = *source++; /* ??? to be unrolled */

   160     } while (--len != 0);

   161 }

   163 int ZLIB_INTERNAL zmemcmp(s1, s2, len)

   164     const Bytef* s1;

   165     const Bytef* s2;

   166     uInt  len;

   167 {

   168     uInt j;

   170     for (j = 0; j < len; j++) {

   171         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;

   172     }

   173     return 0;

   174 }

   176 void ZLIB_INTERNAL zmemzero(dest, len)

   177     Bytef* dest;

   178     uInt  len;

   179 {

   180     if (len == 0) return;

   181     do {

   182         *dest++ = 0;  /* ??? to be unrolled */

   183     } while (--len != 0);

   184 }

   185 #endif

   187 #ifndef Z_SOLO

   189 #ifdef SYS16BIT

   191 #ifdef __TURBOC__

   192 /* Turbo C in 16-bit mode */

   194 #  define MY_ZCALLOC

   196 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes

   197  * and farmalloc(64K) returns a pointer with an offset of 8, so we

   198  * must fix the pointer. Warning: the pointer must be put back to its

   199  * original form in order to free it, use zcfree().

   200  */

   202 #define MAX_PTR 10

   203 /* 10*64K = 640K */

   205 local int next_ptr = 0;

   207 typedef struct ptr_table_s {

   208     voidpf org_ptr;

   209     voidpf new_ptr;

   210 } ptr_table;

   212 local ptr_table table[MAX_PTR];

   213 /* This table is used to remember the original form of pointers

   214  * to large buffers (64K). Such pointers are normalized with a zero offset.

   215  * Since MSDOS is not a preemptive multitasking OS, this table is not

   216  * protected from concurrent access. This hack doesn't work anyway on

   217  * a protected system like OS/2. Use Microsoft C instead.

   218  */

   220 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)

   221 {

   222     voidpf buf = opaque; /* just to make some compilers happy */

   223     ulg bsize = (ulg)items*size;

   225     /* If we allocate less than 65520 bytes, we assume that farmalloc

   226      * will return a usable pointer which doesn't have to be normalized.

   227      */

   228     if (bsize < 65520L) {

   229         buf = farmalloc(bsize);

   230         if (*(ush*)&buf != 0) return buf;

   231     } else {

   232         buf = farmalloc(bsize + 16L);

   233     }

   234     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;

   235     table[next_ptr].org_ptr = buf;

   237     /* Normalize the pointer to seg:0 */

   238     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;

   239     *(ush*)&buf = 0;

   240     table[next_ptr++].new_ptr = buf;

   241     return buf;

   242 }

   244 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)

   245 {

   246     int n;

   247     if (*(ush*)&ptr != 0) { /* object < 64K */

   248         farfree(ptr);

   249         return;

   250     }

   251     /* Find the original pointer */

   252     for (n = 0; n < next_ptr; n++) {

   253         if (ptr != table[n].new_ptr) continue;

   255         farfree(table[n].org_ptr);

   256         while (++n < next_ptr) {

   257             table[n-1] = table[n];

   258         }

   259         next_ptr--;

   260         return;

   261     }

   262     ptr = opaque; /* just to make some compilers happy */

   263     Assert(0, "zcfree: ptr not found");

   264 }

   266 #endif /* __TURBOC__ */

   269 #ifdef M_I86

   270 /* Microsoft C in 16-bit mode */

   272 #  define MY_ZCALLOC

   274 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))

   275 #  define _halloc  halloc

   276 #  define _hfree   hfree

   277 #endif

   279 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)

   280 {

   281     if (opaque) opaque = 0; /* to make compiler happy */

   282     return _halloc((long)items, size);

   283 }

   285 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)

   286 {

   287     if (opaque) opaque = 0; /* to make compiler happy */

   288     _hfree(ptr);

   289 }

   291 #endif /* M_I86 */

   293 #endif /* SYS16BIT */

   296 #ifndef MY_ZCALLOC /* Any system without a special alloc function */

   298 #ifndef STDC

   299 extern voidp  malloc OF((uInt size));

   300 extern voidp  calloc OF((uInt items, uInt size));

   301 extern void   free   OF((voidpf ptr));

   302 #endif

   304 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)

   305     voidpf opaque;

   306     unsigned items;

   307     unsigned size;

   308 {

   309     if (opaque) items += size - size; /* make compiler happy */

   310     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :

   311                               (voidpf)calloc(items, size);

   312 }

   314 void ZLIB_INTERNAL zcfree (opaque, ptr)

   315     voidpf opaque;

   316     voidpf ptr;

   317 {

   318     free(ptr);

   319     if (opaque) return; /* make compiler happy */

   320 }

   322 #endif /* MY_ZCALLOC */

   324 #endif /* !Z_SOLO */

The Tor Browser / file revision

modules/zlib/src/zutil.c@6474c204b198

modules/zlib/src/zutil.c