sl@0: /* zutil.c -- target dependent utility functions for the compression library
sl@0:  * Copyright (C) 1995-1998 Jean-loup Gailly.
sl@0:  * For conditions of distribution and use, see copyright notice in zlib.h 
sl@0:  */
sl@0: 
sl@0: /* @(#) $Id$ */
sl@0: 
sl@0: #include <e32base.h>
sl@0: #include "zutil.h"
sl@0: 
sl@0: 
sl@0: struct internal_state      {int dummy;}; /* for buggy compilers */
sl@0: 
sl@0: #ifndef STDC
sl@0: extern void exit OF((int));
sl@0: #endif
sl@0: 
sl@0: const char * const z_errmsg[10] = {
sl@0: "need dictionary",     /* Z_NEED_DICT       2  */
sl@0: "stream end",          /* Z_STREAM_END      1  */
sl@0: "",                    /* Z_OK              0  */
sl@0: "file error",          /* Z_ERRNO         (-1) */
sl@0: "stream error",        /* Z_STREAM_ERROR  (-2) */
sl@0: "data error",          /* Z_DATA_ERROR    (-3) */
sl@0: "insufficient memory", /* Z_MEM_ERROR     (-4) */
sl@0: "buffer error",        /* Z_BUF_ERROR     (-5) */
sl@0: "incompatible version",/* Z_VERSION_ERROR (-6) */
sl@0: ""};
sl@0: 
sl@0: 
sl@0: EXPORT_C const char * ZEXPORT zlibVersion()
sl@0: {
sl@0:     return ZLIB_VERSION;
sl@0: }
sl@0: 
sl@0: #ifdef DEBUG
sl@0: 
sl@0: #  ifndef verbose
sl@0: #    define verbose 0
sl@0: #  endif
sl@0: const int z_verbose = verbose;
sl@0: 
sl@0: void z_error (m)
sl@0:     char *m;
sl@0: {
sl@0:     fprintf(stderr, "%s\n", m);
sl@0:     exit(1);
sl@0: }
sl@0: #endif
sl@0: 
sl@0: /* exported to allow conversion of error code to string for compress() and
sl@0:  * uncompress()
sl@0:  */
sl@0: EXPORT_C const char * ZEXPORT zError(
sl@0:     int err)
sl@0: {
sl@0:     return ERR_MSG(err);
sl@0: }
sl@0: 
sl@0: 
sl@0: #ifndef HAVE_MEMCPY
sl@0: 
sl@0: void zmemcpy(dest, source, len)
sl@0:     Bytef* dest;
sl@0:     const Bytef* source;
sl@0:     uInt  len;
sl@0: {
sl@0:     if (len == 0) return;
sl@0:     do {
sl@0:         *dest++ = *source++; /* ??? to be unrolled */
sl@0:     } while (--len != 0);
sl@0: }
sl@0: 
sl@0: int zmemcmp(s1, s2, len)
sl@0:     const Bytef* s1;
sl@0:     const Bytef* s2;
sl@0:     uInt  len;
sl@0: {
sl@0:     uInt j;
sl@0: 
sl@0:     for (j = 0; j < len; j++) {
sl@0:         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
sl@0:     }
sl@0:     return 0;
sl@0: }
sl@0: 
sl@0: void zmemzero(dest, len)
sl@0:     Bytef* dest;
sl@0:     uInt  len;
sl@0: {
sl@0:     if (len == 0) return;
sl@0:     do {
sl@0:         *dest++ = 0;  /* ??? to be unrolled */
sl@0:     } while (--len != 0);
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #ifdef __TURBOC__
sl@0: #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
sl@0: /* Small and medium model in Turbo C are for now limited to near allocation
sl@0:  * with reduced MAX_WBITS and MAX_MEM_LEVEL
sl@0:  */
sl@0: #  define MY_ZCALLOC
sl@0: 
sl@0: /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
sl@0:  * and farmalloc(64K) returns a pointer with an offset of 8, so we
sl@0:  * must fix the pointer. Warning: the pointer must be put back to its
sl@0:  * original form in order to free it, use zcfree().
sl@0:  */
sl@0: 
sl@0: #define MAX_PTR 10
sl@0: /* 10*64K = 640K */
sl@0: 
sl@0: local int next_ptr = 0;
sl@0: 
sl@0: typedef struct ptr_table_s {
sl@0:     voidpf org_ptr;
sl@0:     voidpf new_ptr;
sl@0: } ptr_table;
sl@0: 
sl@0: const local ptr_table table[MAX_PTR];
sl@0: /* This table is used to remember the original form of pointers
sl@0:  * to large buffers (64K). Such pointers are normalized with a zero offset.
sl@0:  * Since MSDOS is not a preemptive multitasking OS, this table is not
sl@0:  * protected from concurrent access. This hack doesn't work anyway on
sl@0:  * a protected system like OS/2. Use Microsoft C instead.
sl@0:  */
sl@0: 
sl@0: voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
sl@0: {
sl@0:     voidpf buf = opaque; /* just to make some compilers happy */
sl@0:     ulg bsize = (ulg)items*size;
sl@0: 
sl@0:     /* If we allocate less than 65520 bytes, we assume that farmalloc
sl@0:      * will return a usable pointer which doesn't have to be normalized.
sl@0:      */
sl@0:     if (bsize < 65520L) {
sl@0:         buf = farmalloc(bsize);
sl@0:         if (*(ush*)&buf != 0) return buf;
sl@0:     } else {
sl@0:         buf = farmalloc(bsize + 16L);
sl@0:     }
sl@0:     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
sl@0:     table[next_ptr].org_ptr = buf;
sl@0: 
sl@0:     /* Normalize the pointer to seg:0 */
sl@0:     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
sl@0:     *(ush*)&buf = 0;
sl@0:     table[next_ptr++].new_ptr = buf;
sl@0:     return buf;
sl@0: }
sl@0: 
sl@0: void  zcfree (voidpf opaque, voidpf ptr)
sl@0: {
sl@0:     int n;
sl@0:     if (*(ush*)&ptr != 0) { /* object < 64K */
sl@0:         farfree(ptr);
sl@0:         return;
sl@0:     }
sl@0:     /* Find the original pointer */
sl@0:     for (n = 0; n < next_ptr; n++) {
sl@0:         if (ptr != table[n].new_ptr) continue;
sl@0: 
sl@0:         farfree(table[n].org_ptr);
sl@0:         while (++n < next_ptr) {
sl@0:             table[n-1] = table[n];
sl@0:         }
sl@0:         next_ptr--;
sl@0:         return;
sl@0:     }
sl@0:     ptr = opaque; /* just to make some compilers happy */
sl@0:     Assert(0, "zcfree: ptr not found");
sl@0: }
sl@0: #endif
sl@0: #endif /* __TURBOC__ */
sl@0: 
sl@0: 
sl@0: #if defined(M_I86) && !defined(__32BIT__)
sl@0: /* Microsoft C in 16-bit mode */
sl@0: 
sl@0: #  define MY_ZCALLOC
sl@0: 
sl@0: #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
sl@0: #  define _halloc  halloc
sl@0: #  define _hfree   hfree
sl@0: #endif
sl@0: 
sl@0: voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
sl@0: {
sl@0:     if (opaque) opaque = 0; /* to make compiler happy */
sl@0:     return _halloc((long)items, size);
sl@0: }
sl@0: 
sl@0: void  zcfree (voidpf opaque, voidpf ptr)
sl@0: {
sl@0:     if (opaque) opaque = 0; /* to make compiler happy */
sl@0:     _hfree(ptr);
sl@0: }
sl@0: 
sl@0: #endif /* MSC */
sl@0: 
sl@0: 
sl@0: #ifndef MY_ZCALLOC /* Any system without a special alloc function */
sl@0: 
sl@0: #ifndef STDC
sl@0: extern voidp  calloc OF((uInt items, uInt size));
sl@0: extern void   free   OF((voidpf ptr));
sl@0: #endif
sl@0: 
sl@0: voidpf zcalloc (
sl@0:     voidpf opaque,
sl@0:     unsigned items,
sl@0:     unsigned size)
sl@0: {
sl@0:     if (opaque) items += size - size; /* make compiler happy */
sl@0: //    return (voidpf)calloc(items, size);
sl@0: 	TInt bytes = items*size;
sl@0: 	TAny *ptr = User::Alloc(bytes);
sl@0: 	if (ptr)
sl@0: 		Mem::FillZ(ptr,bytes);
sl@0: 	return (voidpf) ptr;  // Mark Ryan, Symbian 14/9/99
sl@0: }
sl@0: 
sl@0: void  zcfree (
sl@0:     voidpf opaque,
sl@0:     voidpf ptr)
sl@0: {
sl@0:     //free(ptr);
sl@0: 	User::Free(ptr); // Mark Ryan, Symbian 14/9/99
sl@0:     if (opaque) return; /* make compiler happy */
sl@0: }
sl@0: 
sl@0: #endif /* MY_ZCALLOC */