1 /* zutil.cpp -- 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.cpp,v 1.1.2.1 2008/08/14 15:26:58 e0222316 Exp $ */

     7 

     8 #ifdef SYMBIAN_EZLIB_DEVICE

     9   #include <e32base.h>

    10 #endif

    11 

    12 #include "zutil.h"

    13 

    14 

    15 #ifndef NO_DUMMY_DECL

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

    17 #endif

    18 

    19 

    20 const char * const z_errmsg[10] = {

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

    22 "stream end",          /* Z_STREAM_END      1  */

    23 "",                    /* Z_OK              0  */

    24 "file error",          /* Z_ERRNO         (-1) */

    25 "stream error",        /* Z_STREAM_ERROR  (-2) */

    26 "data error",          /* Z_DATA_ERROR    (-3) */

    27 "insufficient memory", /* Z_MEM_ERROR     (-4) */

    28 "buffer error",        /* Z_BUF_ERROR     (-5) */

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

    30 ""};

    31 

    32 

    33 #ifdef __SYMBIAN32__

    34 EXPORT_C const char *  zlibVersion_r()

    35 #else

    36 const char * ZEXPORT zlibVersion()

    37 #endif //__SYMBIAN32__

    38 {

    39     return ZLIB_VERSION;

    40 }

    41 

    42 

    43 #ifdef __SYMBIAN32__

    44 EXPORT_C uLong  zlibCompileFlags_r()

    45 #else

    46 uLong ZEXPORT zlibCompileFlags()

    47 #endif //__SYMBIAN32__

    48 {

    49     uLong flags;

    50 

    51     flags = 0;

    52     switch (sizeof(uInt)) {

    53     case 2:     break;

    54     case 4:     flags += 1;     break;

    55     case 8:     flags += 2;     break;

    56     default:    flags += 3;

    57     }

    58     switch (sizeof(uLong)) {

    59     case 2:     break;

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

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

    62     default:    flags += 3 << 2;

    63     }

    64     switch (sizeof(voidpf)) {

    65     case 2:     break;

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

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

    68     default:    flags += 3 << 4;

    69     }

    70     switch (sizeof(z_off_t)) {

    71     case 2:     break;

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

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

    74     default:    flags += 3 << 6;

    75     }

    76 #ifdef DEBUG

    77     flags += 1 << 8;

    78 #endif

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

    80     flags += 1 << 9;

    81 #endif

    82 #ifdef ZLIB_WINAPI

    83     flags += 1 << 10;

    84 #endif

    85 #ifdef BUILDFIXED

    86     flags += 1 << 12;

    87 #endif

    88 #ifdef DYNAMIC_CRC_TABLE

    89     flags += 1 << 13;

    90 #endif

    91 #ifdef NO_GZCOMPRESS

    92     flags += 1L << 16;

    93 #endif

    94 #ifdef NO_GZIP

    95     flags += 1L << 17;

    96 #endif

    97 #ifdef PKZIP_BUG_WORKAROUND

    98     flags += 1L << 20;

    99 #endif

   100 #ifdef FASTEST

   101     flags += 1L << 21;

   102 #endif

   103 #ifdef STDC

   104 #  ifdef NO_vsnprintf

   105         flags += 1L << 25;

   106 #    ifdef HAS_vsprintf_void

   107         flags += 1L << 26;

   108 #    endif

   109 #  else

   110 #    ifdef HAS_vsnprintf_void

   111         flags += 1L << 26;

   112 #    endif

   113 #  endif

   114 #else

   115         flags += 1L << 24;

   116 #  ifdef NO_snprintf

   117         flags += 1L << 25;

   118 #    ifdef HAS_sprintf_void

   119         flags += 1L << 26;

   120 #    endif

   121 #  else

   122 #    ifdef HAS_snprintf_void

   123         flags += 1L << 26;

   124 #    endif

   125 #  endif

   126 #endif

   127     return flags;

   128 }

   129 

   130 #ifdef DEBUG

   131 

   132 #  ifndef verbose

   133 #    define verbose 0

   134 #  endif

   135 int z_verbose = verbose;

   136 

   137 void z_error (m)

   138     char *m;

   139 {

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

   141     exit(1);

   142 }

   143 #endif

   144 

   145 

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

   147  * uncompress()

   148  */

   149 #ifdef __SYMBIAN32__

   150 EXPORT_C const char *  zError_r(int err)

   151 #else

   152 const char * ZEXPORT zError(err)

   153     int err;

   154 #endif //__SYMBIAN32__

   155 {

   156     return ERR_MSG(err);

   157 }

   158 

   159 

   160 #if defined(_WIN32_WCE)

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

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

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

   164      */

   165     int errno = 0;

   166 #endif

   167 

   168 #ifndef HAVE_MEMCPY

   169 

   170 #ifdef __SYMBIAN32__

   171 void zmemcpy(    Bytef* dest,const Bytef*  source,uInt  len)

   172 #else

   173 void zmemcpy(dest, source, len)

   174     Bytef* dest;

   175     const Bytef* source;

   176     uInt  len;

   177 #endif //__SYMBIAN32__	

   178 {

   179     if (len == 0) return;

   180     do {

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

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

   183 }

   184 

   185 #ifdef __SYMBIAN32__

   186 int zmemcmp(    const Bytef* s1,    const Bytef*  s2,uInt  len)

   187 #else	

   188 int zmemcmp(s1, s2, len)

   189     const Bytef* s1;

   190     const Bytef* s2;

   191     uInt  len;

   192 #endif //__SYMBIAN32__		

   193 {

   194     uInt j;

   195 

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

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

   198     }

   199     return 0;

   200 }

   201 

   202 #ifdef __SYMBIAN32__

   203 void zmemzero( Bytef* dest,uInt  len)

   204 #else	

   205 void zmemzero(dest, len)

   206     Bytef* dest;

   207     uInt  len;

   208 #endif //__SYMBIAN32__		

   209 {

   210     if (len == 0) return;

   211     do {

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

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

   214 }

   215 #endif

   216 

   217 

   218 #ifdef SYS16BIT

   219 

   220 #ifdef __TURBOC__

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

   222 

   223 #  define MY_ZCALLOC

   224 

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

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

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

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

   229  */

   230 

   231 #define MAX_PTR 10

   232 /* 10*64K = 640K */

   233 

   234 local int next_ptr = 0;

   235 

   236 typedef struct ptr_table_s {

   237     voidpf org_ptr;

   238     voidpf new_ptr;

   239 } ptr_table;

   240 

   241 local ptr_table table[MAX_PTR];

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

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

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

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

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

   247  */

   248 

   249 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)

   250 {

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

   252     ulg bsize = (ulg)items*size;

   253 

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

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

   256      */

   257     if (bsize < 65520L) {

   258         buf = farmalloc(bsize);

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

   260     } else {

   261         buf = farmalloc(bsize + 16L);

   262     }

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

   264     table[next_ptr].org_ptr = buf;

   265 

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

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

   268     *(ush*)&buf = 0;

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

   270     return buf;

   271 }

   272 

   273 void  zcfree (voidpf opaque, voidpf ptr)

   274 {

   275     int n;

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

   277         farfree(ptr);

   278         return;

   279     }

   280     /* Find the original pointer */

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

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

   283 

   284         farfree(table[n].org_ptr);

   285         while (++n < next_ptr) {

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

   287         }

   288         next_ptr--;

   289         return;

   290     }

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

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

   293 }

   294 

   295 #endif /* __TURBOC__ */

   296 

   297 

   298 #ifdef M_I86

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

   300 

   301 #  define MY_ZCALLOC

   302 

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

   304 #  define _halloc  halloc

   305 #  define _hfree   hfree

   306 #endif

   307 

   308 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)

   309 {

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

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

   312 }

   313 

   314 void  zcfree (voidpf opaque, voidpf ptr)

   315 {

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

   317     _hfree(ptr);

   318 }

   319 

   320 #endif /* M_I86 */

   321 

   322 #endif /* SYS16BIT */

   323 

   324 

   325 

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

   327 

   328 #ifndef STDC

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

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

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

   332 #endif

   333 

   334 #ifdef __SYMBIAN32__

   335 voidpf zcalloc (voidpf opaque,unsigned  items, unsigned size)

   336 #else 	

   337 voidpf zcalloc (opaque, items, size)

   338     voidpf opaque;

   339     unsigned items;

   340     unsigned size;

   341 #endif //__SYMBIAN32__	

   342 {

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

   344 #ifndef SYMBIAN_EZLIB_DEVICE

   345   return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : (voidpf)calloc(items, size);

   346 #else

   347 	TInt bytes = items*size;

   348 	TAny *ptr = User::AllocZ(bytes); // Symbian Native memory allocation API

   349 	return (voidpf) ptr;

   350 #endif //SYMBIAN_EZLIB_DEVICE

   351 }

   352 

   353 #ifdef __SYMBIAN32__

   354 void  zcfree (voidpf opaque,voidpf  ptr)

   355 #else 	

   356 void  zcfree (opaque, ptr)

   357     voidpf opaque;

   358     voidpf ptr;

   359 #endif //__SYMBIAN32__	

   360 {

   361 #ifndef SYMBIAN_EZLIB_DEVICE

   362   free(ptr);

   363 #else

   364 	User::Free(ptr); // Symbian Native memory deallocation API

   365 #endif //SYMBIAN_EZLIB_DEVICE

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

   367 }

   368 

   369 #endif /* MY_ZCALLOC */

   370 

   371