AppleWin/source/Tfe/tfesupp.cpp

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/*
* This file is a consolidation of functions required for tfe
* emulation taken from the following files
*
* lib.c - Library functions.
* util.c - Miscellaneous utility functions.
* crc32.c
*
* Written by
* Andreas Boose <viceteam@t-online.de>
* Ettore Perazzoli <ettore@comm2000.it>
* Andreas Matthies <andreas.matthies@gmx.net>
* Tibor Biczo <crown@mail.matav.hu>
* Spiro Trikaliotis <Spiro.Trikaliotis@gmx.de>*
*
* This file is part of VICE, the Versatile Commodore Emulator.
* See README for copyright notice.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*
*/
#include <stdlib.h>
#include <string.h>
// Lib Stuff
/* #define LIB_DEBUG*/
#ifdef LIB_DEBUG
#define LIB_DEBUG_SIZE 0x10000
#define LIB_DEBUG_GUARD 0x1000
#endif
#define CRC32_POLY 0xedb88320
static unsigned long crc32_table[256];
static int crc32_is_initialized = 0;
void lib_free(void *ptr)
{
#ifdef LIB_DEBUG
lib_debug_free(ptr, 1, 1);
#endif
#ifdef LIB_DEBUG
lib_debug_libc_free(ptr);
#else
free(ptr);
#endif
}
void *lib_malloc(size_t size)
{
#ifdef LIB_DEBUG
void *ptr = lib_debug_libc_malloc(size);
#else
void *ptr = malloc(size);
#endif
#ifndef __OS2__
if (ptr == NULL && size > 0)
exit(-1);
#endif
#ifdef LIB_DEBUG
lib_debug_alloc(ptr, size, 3);
#endif
return ptr;
}
/*-----------------------------------------------------------------------*/
/* Malloc enough space for `str', copy `str' into it and return its
address. */
char *lib_stralloc(const char *str)
{
size_t size;
char *ptr;
if (str == NULL)
exit(-1);
size = strlen(str) + 1;
ptr = (char *)lib_malloc(size);
memcpy(ptr, str, size);
return ptr;
}
/* Like realloc, but abort if not enough memory is available. */
void *lib_realloc(void *ptr, size_t size)
{
#ifdef LIB_DEBUG
void *new_ptr = lib_debug_libc_realloc(ptr, size);
#else
void *new_ptr = realloc(ptr, size);
#endif
#ifndef __OS2__
if (new_ptr == NULL)
exit(-1);
#endif
#ifdef LIB_DEBUG
lib_debug_free(ptr, 1, 0);
lib_debug_alloc(new_ptr, size, 1);
#endif
return new_ptr;
}
// Util Stuff
/* Set a new value to the dynamically allocated string *str.
Returns `-1' if nothing has to be done. */
int util_string_set(char **str, const char *new_value)
{
if (*str == NULL) {
if (new_value != NULL)
*str = lib_stralloc(new_value);
} else {
if (new_value == NULL) {
lib_free(*str);
*str = NULL;
} else {
/* Skip copy if src and dest are already the same. */
if (strcmp(*str, new_value) == 0)
return -1;
*str = (char *)lib_realloc(*str, strlen(new_value) + 1);
strcpy(*str, new_value);
}
}
return 0;
}
// crc32 Stuff
unsigned long crc32_buf(const char *buffer, unsigned int len)
{
int i, j;
unsigned long crc, c;
const char *p;
if (!crc32_is_initialized) {
for (i = 0; i < 256; i++) {
c = (unsigned long) i;
for (j = 0; j < 8; j++)
c = c & 1 ? CRC32_POLY ^ (c >> 1) : c >> 1;
crc32_table[i] = c;
}
crc32_is_initialized = 1;
}
crc = 0xffffffff;
for (p = buffer; len > 0; ++p, --len)
crc = (crc >> 8) ^ crc32_table[(crc ^ *p) & 0xff];
return ~crc;
}