Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | Download | RSS feed

  1. /* zutil.c -- target dependent utility functions for the compression library
  2.  * Copyright (C) 1995-2005, 2010 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 ((int)(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 ((int)(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 ((int)(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 ((int)(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 ZLIB_INTERNAL z_verbose = verbose;
  121.  
  122. void ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
  276. {
  277.     if (opaque) opaque = 0; /* to make compiler happy */
  278.     return _halloc((long)items, size);
  279. }
  280.  
  281. void ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 ZLIB_INTERNAL 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 */
  319.