1			/* zutil.c -- target dependent utility functions for the compression library
     2			 * Copyright (C) 1995-2003 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			#ifndef STDC
    15			extern void exit OF((int));
    16			#endif
    17			
    18			const char * const z_errmsg[10] = {
    19			"need dictionary",     /* Z_NEED_DICT       2  */
    20			"stream end",          /* Z_STREAM_END      1  */
    21			"",                    /* Z_OK              0  */
    22			"file error",          /* Z_ERRNO         (-1) */
    23			"stream error",        /* Z_STREAM_ERROR  (-2) */
    24			"data error",          /* Z_DATA_ERROR    (-3) */
    25			"insufficient memory", /* Z_MEM_ERROR     (-4) */
    26			"buffer error",        /* Z_BUF_ERROR     (-5) */
    27			"incompatible version",/* Z_VERSION_ERROR (-6) */
    28			""};
    29			
    30			
    31			const char * ZEXPORT zlibVersion()
    32	          31    {
    33	          31        return ZLIB_VERSION;
    34			}
    35			
    36			uLong ZEXPORT zlibCompileFlags()
    37	      ######    {
    38	      ######        uLong flags;
    39			
    40	      ######        flags = 0;
    41	      ######        switch (sizeof(uInt)) {
    42	      ######        case 2:     break;
    43	      ######        case 4:     flags += 1;     break;
    44	      ######        case 8:     flags += 2;     break;
    45	      ######        default:    flags += 3;
    46			    }
    47	      ######        switch (sizeof(uLong)) {
    48	      ######        case 2:     break;
    49	      ######        case 4:     flags += 1 << 2;        break;
    50	      ######        case 8:     flags += 2 << 2;        break;
    51	      ######        default:    flags += 3 << 2;
    52			    }
    53	      ######        switch (sizeof(voidpf)) {
    54	      ######        case 2:     break;
    55	      ######        case 4:     flags += 1 << 4;        break;
    56	      ######        case 8:     flags += 2 << 4;        break;
    57	      ######        default:    flags += 3 << 4;
    58			    }
    59	      ######        switch (sizeof(z_off_t)) {
    60	      ######        case 2:     break;
    61	      ######        case 4:     flags += 1 << 6;        break;
    62	      ######        case 8:     flags += 2 << 6;        break;
    63	      ######        default:    flags += 3 << 6;
    64			    }
    65			#ifdef DEBUG
    66			    flags += 1 << 8;
    67			#endif
    68			#if defined(ASMV) || defined(ASMINF)
    69			    flags += 1 << 9;
    70			#endif
    71			#ifdef ZLIB_WINAPI
    72			    flags += 1 << 10;
    73			#endif
    74			#ifdef BUILDFIXED
    75			    flags += 1 << 12;
    76			#endif
    77			#ifdef DYNAMIC_CRC_TABLE
    78			    flags += 1 << 13;
    79			#endif
    80			#ifdef NO_GZCOMPRESS
    81			    flags += 1 << 16;
    82			#endif
    83			#ifdef NO_GZIP
    84			    flags += 1 << 17;
    85			#endif
    86			#ifdef PKZIP_BUG_WORKAROUND
    87			    flags += 1 << 20;
    88			#endif
    89			#ifdef FASTEST
    90			    flags += 1 << 21;
    91			#endif
    92			#ifdef STDC
    93			#  ifdef NO_vsnprintf
    94			        flags += 1 << 25;
    95			#    ifdef HAS_vsprintf_void
    96			        flags += 1 << 26;
    97			#    endif
    98			#  else
    99			#    ifdef HAS_vsnprintf_void
   100			        flags += 1 << 26;
   101			#    endif
   102			#  endif
   103			#else
   104			        flags += 1 << 24;
   105			#  ifdef NO_snprintf
   106			        flags += 1 << 25;
   107			#    ifdef HAS_sprintf_void
   108			        flags += 1 << 26;
   109			#    endif
   110			#  else
   111			#    ifdef HAS_snprintf_void
   112			        flags += 1 << 26;
   113			#    endif
   114			#  endif
   115			#endif
   116	      ######        return flags;
   117			}
   118			
   119			#ifdef DEBUG
   120			
   121			#  ifndef verbose
   122			#    define verbose 0
   123			#  endif
   124			int z_verbose = verbose;
   125			
   126			void z_error (m)
   127			    char *m;
   128			{
   129			    fprintf(stderr, "%s\n", m);
   130			    exit(1);
   131			}
   132			#endif
   133			
   134			/* exported to allow conversion of error code to string for compress() and
   135			 * uncompress()
   136			 */
   137			const char * ZEXPORT zError(err)
   138			    int err;
   139	      ######    {
   140	      ######        return ERR_MSG(err);
   141			}
   142			
   143			#if defined(_WIN32_WCE)
   144			    /* does not exist on WCE */
   145			    int errno = 0;
   146			#endif
   147			
   148			#ifndef HAVE_MEMCPY
   149			
   150			void zmemcpy(dest, source, len)
   151			    Bytef* dest;
   152			    const Bytef* source;
   153			    uInt  len;
   154			{
   155			    if (len == 0) return;
   156			    do {
   157			        *dest++ = *source++; /* ??? to be unrolled */
   158			    } while (--len != 0);
   159			}
   160			
   161			int zmemcmp(s1, s2, len)
   162			    const Bytef* s1;
   163			    const Bytef* s2;
   164			    uInt  len;
   165			{
   166			    uInt j;
   167			
   168			    for (j = 0; j < len; j++) {
   169			        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
   170			    }
   171			    return 0;
   172			}
   173			
   174			void zmemzero(dest, len)
   175			    Bytef* dest;
   176			    uInt  len;
   177			{
   178			    if (len == 0) return;
   179			    do {
   180			        *dest++ = 0;  /* ??? to be unrolled */
   181			    } while (--len != 0);
   182			}
   183			#endif
   184			
   185			
   186			#ifdef SYS16BIT
   187			
   188			#ifdef __TURBOC__
   189			/* Turbo C in 16-bit mode */
   190			
   191			#  define MY_ZCALLOC
   192			
   193			/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
   194			 * and farmalloc(64K) returns a pointer with an offset of 8, so we
   195			 * must fix the pointer. Warning: the pointer must be put back to its
   196			 * original form in order to free it, use zcfree().
   197			 */
   198			
   199			#define MAX_PTR 10
   200			/* 10*64K = 640K */
   201			
   202			local int next_ptr = 0;
   203			
   204			typedef struct ptr_table_s {
   205			    voidpf org_ptr;
   206			    voidpf new_ptr;
   207			} ptr_table;
   208			
   209			local ptr_table table[MAX_PTR];
   210			/* This table is used to remember the original form of pointers
   211			 * to large buffers (64K). Such pointers are normalized with a zero offset.
   212			 * Since MSDOS is not a preemptive multitasking OS, this table is not
   213			 * protected from concurrent access. This hack doesn't work anyway on
   214			 * a protected system like OS/2. Use Microsoft C instead.
   215			 */
   216			
   217			voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
   218			{
   219			    voidpf buf = opaque; /* just to make some compilers happy */
   220			    ulg bsize = (ulg)items*size;
   221			
   222			    /* If we allocate less than 65520 bytes, we assume that farmalloc
   223			     * will return a usable pointer which doesn't have to be normalized.
   224			     */
   225			    if (bsize < 65520L) {
   226			        buf = farmalloc(bsize);
   227			        if (*(ush*)&buf != 0) return buf;
   228			    } else {
   229			        buf = farmalloc(bsize + 16L);
   230			    }
   231			    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
   232			    table[next_ptr].org_ptr = buf;
   233			
   234			    /* Normalize the pointer to seg:0 */
   235			    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
   236			    *(ush*)&buf = 0;
   237			    table[next_ptr++].new_ptr = buf;
   238			    return buf;
   239			}
   240			
   241			void  zcfree (voidpf opaque, voidpf ptr)
   242			{
   243			    int n;
   244			    if (*(ush*)&ptr != 0) { /* object < 64K */
   245			        farfree(ptr);
   246			        return;
   247			    }
   248			    /* Find the original pointer */
   249			    for (n = 0; n < next_ptr; n++) {
   250			        if (ptr != table[n].new_ptr) continue;
   251			
   252			        farfree(table[n].org_ptr);
   253			        while (++n < next_ptr) {
   254			            table[n-1] = table[n];
   255			        }
   256			        next_ptr--;
   257			        return;
   258			    }
   259			    ptr = opaque; /* just to make some compilers happy */
   260			    Assert(0, "zcfree: ptr not found");
   261			}
   262			
   263			#endif /* __TURBOC__ */
   264			
   265			
   266			#ifdef M_I86
   267			/* Microsoft C in 16-bit mode */
   268			
   269			#  define MY_ZCALLOC
   270			
   271			#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
   272			#  define _halloc  halloc
   273			#  define _hfree   hfree
   274			#endif
   275			
   276			voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
   277			{
   278			    if (opaque) opaque = 0; /* to make compiler happy */
   279			    return _halloc((long)items, size);
   280			}
   281			
   282			void  zcfree (voidpf opaque, voidpf ptr)
   283			{
   284			    if (opaque) opaque = 0; /* to make compiler happy */
   285			    _hfree(ptr);
   286			}
   287			
   288			#endif /* M_I86 */
   289			
   290			#endif /* SYS16BIT */
   291			
   292			
   293			#ifndef MY_ZCALLOC /* Any system without a special alloc function */
   294			
   295			#ifndef STDC
   296			extern voidp  malloc OF((uInt size));
   297			extern voidp  calloc OF((uInt items, uInt size));
   298			extern void   free   OF((voidpf ptr));
   299			#endif
   300			
   301			voidpf zcalloc (opaque, items, size)
   302			    voidpf opaque;
   303			    unsigned items;
   304			    unsigned size;
   305	         463    {
   306	         463        if (opaque) items += size - size; /* make compiler happy */
   307	         463        return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
   308			                              (voidpf)calloc(items, size);
   309			}
   310			
   311			void  zcfree (opaque, ptr)
   312			    voidpf opaque;
   313			    voidpf ptr;
   314	         463    {
   315	         463        free(ptr);
   316	         463        if (opaque) return; /* make compiler happy */
   317			}
   318			
   319			#endif /* MY_ZCALLOC */