FreeBSD/Linux Kernel Cross Reference
sys/contrib/zlib/zutil.c

     /* zutil.c -- target dependent utility functions for the compression library
      * Copyright (C) 1995-2017 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
    
    z_const char * const z_errmsg[10] = {
        (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
        (z_const char *)"stream end",          /* Z_STREAM_END      1  */
        (z_const char *)"",                    /* Z_OK              0  */
        (z_const char *)"file error",          /* Z_ERRNO         (-1) */
        (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
        (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
        (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
        (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
        (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
        (z_const char *)""
    };
    
    
    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 ZLIB_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 ZLIB_DEBUG
   #include <stdlib.h>
   #  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) && _WIN32_WCE < 0x800
       /* The older 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;
       ulg bsize = (ulg)items*size;
   
       (void)opaque;
   
       /* 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;
   
       (void)opaque;
   
       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;
       }
       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)
   {
       (void)opaque;
       return _halloc((long)items, size);
   }
   
   void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
   {
       (void)opaque;
       _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;
   {
       (void)opaque;
       return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
                                 (voidpf)calloc(items, size);
   }
   
   void ZLIB_INTERNAL zcfree (opaque, ptr)
       voidpf opaque;
       voidpf ptr;
   {
       (void)opaque;
       free(ptr);
   }
   
   #endif /* MY_ZCALLOC */
   
   #endif /* !Z_SOLO */

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