File indexing completed on 2024-04-21 03:48:33

 /* zutil.c -- target dependent utility functions for the compression library
  * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
 /* @(#) $Id$ */
 
 #include "zutil.h"
 #ifndef Z_SOLO
 #  include "gzguts.h"
 #endif
 
 #ifndef NO_DUMMY_DECL
 struct internal_state      {int dummy;}; /* for buggy compilers */
 #endif
 
 z_const char * const z_errmsg[10] = {
 "need dictionary",     /* Z_NEED_DICT       2  */
 "stream end",          /* Z_STREAM_END      1  */
 "",                    /* Z_OK              0  */
 "file error",          /* Z_ERRNO         (-1) */
 "stream error",        /* Z_STREAM_ERROR  (-2) */
 "data error",          /* Z_DATA_ERROR    (-3) */
 "insufficient memory", /* Z_MEM_ERROR     (-4) */
 "buffer error",        /* Z_BUF_ERROR     (-5) */
 "incompatible version",/* Z_VERSION_ERROR (-6) */
 ""};
 
 
 const char * ZEXPORT zlibVersion()
 {
     return ZLIB_VERSION;
 }
 
 uLong ZEXPORT zlibCompileFlags()
 {
     uLong flags;
 
     flags = 0;
     switch ((int)(sizeof(uInt))) {
     case 2:     break;
     case 4:     flags += 1;     break;
     case 8:     flags += 2;     break;
     default:    flags += 3;
     }
     switch ((int)(sizeof(uLong))) {
     case 2:     break;
     case 4:     flags += 1 << 2;        break;
     case 8:     flags += 2 << 2;        break;
     default:    flags += 3 << 2;
     }
     switch ((int)(sizeof(voidpf))) {
     case 2:     break;
     case 4:     flags += 1 << 4;        break;
     case 8:     flags += 2 << 4;        break;
     default:    flags += 3 << 4;
     }
     switch ((int)(sizeof(z_off_t))) {
     case 2:     break;
     case 4:     flags += 1 << 6;        break;
     case 8:     flags += 2 << 6;        break;
     default:    flags += 3 << 6;
     }
 #ifdef DEBUG
     flags += 1 << 8;
 #endif
 #if defined(ASMV) || defined(ASMINF)
     flags += 1 << 9;
 #endif
 #ifdef ZLIB_WINAPI
     flags += 1 << 10;
 #endif
 #ifdef BUILDFIXED
     flags += 1 << 12;
 #endif
 #ifdef DYNAMIC_CRC_TABLE
     flags += 1 << 13;
 #endif
 #ifdef NO_GZCOMPRESS
     flags += 1L << 16;
 #endif
 #ifdef NO_GZIP
     flags += 1L << 17;
 #endif
 #ifdef PKZIP_BUG_WORKAROUND
     flags += 1L << 20;
 #endif
 #ifdef FASTEST
     flags += 1L << 21;
 #endif
 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
 #  ifdef NO_vsnprintf
     flags += 1L << 25;
 #    ifdef HAS_vsprintf_void
     flags += 1L << 26;
 #    endif
 #  else
 #    ifdef HAS_vsnprintf_void
     flags += 1L << 26;
 #    endif
 #  endif
 #else
     flags += 1L << 24;
 #  ifdef NO_snprintf
     flags += 1L << 25;
 #    ifdef HAS_sprintf_void
     flags += 1L << 26;
 #    endif
 #  else
 #    ifdef HAS_snprintf_void
     flags += 1L << 26;
 #    endif
 #  endif
 #endif
     return flags;
 }
 
 #ifdef DEBUG
 
 #  ifndef verbose
 #    define verbose 0
 #  endif
 int ZLIB_INTERNAL z_verbose = verbose;
 
 void ZLIB_INTERNAL z_error (m)
     char *m;
 {
     fprintf(stderr, "%s\n", m);
     exit(1);
 }
 #endif
 
 /* exported to allow conversion of error code to string for compress() and
  * uncompress()
  */
 const char * ZEXPORT zError(err)
     int err;
 {
     return ERR_MSG(err);
 }
 
 #if defined(_WIN32_WCE)
     /* The Microsoft C Run-Time Library for Windows CE doesn't have
      * errno.  We define it as a global variable to simplify porting.
      * Its value is always 0 and should not be used.
      */
     int errno = 0;
 #endif
 
 #ifndef HAVE_MEMCPY
 
 void ZLIB_INTERNAL zmemcpy(dest, source, len)
     Bytef* dest;
     const Bytef* source;
     uInt  len;
 {
     if (len == 0) return;
     do {
         *dest++ = *source++; /* ??? to be unrolled */
     } while (--len != 0);
 }
 
 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
     const Bytef* s1;
     const Bytef* s2;
     uInt  len;
 {
     uInt j;
 
     for (j = 0; j < len; j++) {
         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
     }
     return 0;
 }
 
 void ZLIB_INTERNAL zmemzero(dest, len)
     Bytef* dest;
     uInt  len;
 {
     if (len == 0) return;
     do {
         *dest++ = 0;  /* ??? to be unrolled */
     } while (--len != 0);
 }
 #endif
 
 #ifndef Z_SOLO
 
 #ifdef SYS16BIT
 
 #ifdef __TURBOC__
 /* Turbo C in 16-bit mode */
 
 #  define MY_ZCALLOC
 
 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
  * and farmalloc(64K) returns a pointer with an offset of 8, so we
  * must fix the pointer. Warning: the pointer must be put back to its
  * original form in order to free it, use zcfree().
  */
 
 #define MAX_PTR 10
 /* 10*64K = 640K */
 
 local int next_ptr = 0;
 
 typedef struct ptr_table_s {
     voidpf org_ptr;
     voidpf new_ptr;
 } ptr_table;
 
 local ptr_table table[MAX_PTR];
 /* This table is used to remember the original form of pointers
  * to large buffers (64K). Such pointers are normalized with a zero offset.
  * Since MSDOS is not a preemptive multitasking OS, this table is not
  * protected from concurrent access. This hack doesn't work anyway on
  * a protected system like OS/2. Use Microsoft C instead.
  */
 
 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
 {
     voidpf buf = opaque; /* just to make some compilers happy */
     ulg bsize = (ulg)items*size;
 
     /* If we allocate less than 65520 bytes, we assume that farmalloc
      * will return a usable pointer which doesn't have to be normalized.
      */
     if (bsize < 65520L) {
         buf = farmalloc(bsize);
         if (*(ush*)&buf != 0) return buf;
     } else {
         buf = farmalloc(bsize + 16L);
     }
     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
     table[next_ptr].org_ptr = buf;
 
     /* Normalize the pointer to seg:0 */
     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
     *(ush*)&buf = 0;
     table[next_ptr++].new_ptr = buf;
     return buf;
 }
 
 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
 {
     int n;
     if (*(ush*)&ptr != 0) { /* object < 64K */
         farfree(ptr);
         return;
     }
     /* Find the original pointer */
     for (n = 0; n < next_ptr; n++) {
         if (ptr != table[n].new_ptr) continue;
 
         farfree(table[n].org_ptr);
         while (++n < next_ptr) {
             table[n-1] = table[n];
         }
         next_ptr--;
         return;
     }
     ptr = opaque; /* just to make some compilers happy */
     Assert(0, "zcfree: ptr not found");
 }
 
 #endif /* __TURBOC__ */
 
 
 #ifdef M_I86
 /* Microsoft C in 16-bit mode */
 
 #  define MY_ZCALLOC
 
 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
 #  define _halloc  halloc
 #  define _hfree   hfree
 #endif
 
 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
 {
     if (opaque) opaque = 0; /* to make compiler happy */
     return _halloc((long)items, size);
 }
 
 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
 {
     if (opaque) opaque = 0; /* to make compiler happy */
     _hfree(ptr);
 }
 
 #endif /* M_I86 */
 
 #endif /* SYS16BIT */
 
 
 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
 
 #ifndef STDC
 extern voidp  malloc OF((uInt size));
 extern voidp  calloc OF((uInt items, uInt size));
 extern void   free   OF((voidpf ptr));
 #endif
 
 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
     voidpf opaque;
     unsigned items;
     unsigned size;
 {
     if (opaque) items += size - size; /* make compiler happy */
     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
                               (voidpf)calloc(items, size);
 }
 
 void ZLIB_INTERNAL zcfree (opaque, ptr)
     voidpf opaque;
     voidpf ptr;
 {
     free(ptr);
     if (opaque) return; /* make compiler happy */
 }
 
 #endif /* MY_ZCALLOC */
 
 #endif /* !Z_SOLO */