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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
*
* 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.
*
* $Header$
*
*/
#include "stdafx.h"
#include "scumm.h"
void *Scumm::fileOpen(const char *filename, int mode) {
_fileMode = mode;
_whereInResToRead = 0;
clearFileReadFailed(_fileHandle);
if (mode==1)
return fopen(filename, "rb");
if (mode==2) {
error("fileOpen: write not supported");
}
return NULL;
}
void Scumm::fileClose(void *file) {
if (_fileMode==1 || _fileMode==2)
fclose((FILE*)file);
}
bool Scumm::fileReadFailed(void *file) {
return _fileReadFailed != 0;
}
void Scumm::clearFileReadFailed(void *file) {
_fileReadFailed = false;
}
bool Scumm::fileEof(void *file) {
return feof((FILE*)file) != 0;
}
uint32 Scumm::filePos(void *handle) {
return ftell((FILE*)handle);
}
void Scumm::fileSeek(void *file, long offs, int whence) {
switch(_fileMode) {
case 1: case 2:
if (fseek((FILE*)file, offs, whence)!=0)
clearerr((FILE*)file);
return;
case 3:
_whereInResToRead = offs;
return;
}
}
void Scumm::fileRead(void *file, void *ptr, uint32 size) {
byte *ptr2 = (byte*)ptr, *src;
switch(_fileMode) {
case 1:
if (size==0)
return;
if ((uint32)fread(ptr2, size, 1, (FILE*)file) != 1) {
clearerr((FILE*)file);
_fileReadFailed = true;
}
do {
*ptr2++ ^= _encbyte;
} while(--size);
return;
case 3:
if (size==0)
return;
src = getResourceAddress(rtTemp, 3) + _whereInResToRead;
_whereInResToRead += size;
do {
*ptr2++ = *src++ ^ _encbyte;
} while (--size);
return;
}
}
int Scumm::fileReadByte() {
byte b;
byte *src;
switch(_fileMode) {
case 1:
if (fread(&b,1,1,(FILE*)_fileHandle) != 1) {
clearerr((FILE*)_fileHandle);
_fileReadFailed = true;
}
return b ^ _encbyte;
case 3:
src = getResourceAddress(rtTemp, 3) + _whereInResToRead;
_whereInResToRead++;
return *src ^ _encbyte;
}
return 0;
}
uint Scumm::fileReadWordLE() {
uint a = fileReadByte();
uint b = fileReadByte();
return a|(b<<8);
}
uint32 Scumm::fileReadDwordLE() {
uint a = fileReadWordLE();
uint b = fileReadWordLE();
return (b<<16)|a;
}
uint Scumm::fileReadWordBE() {
uint b = fileReadByte();
uint a = fileReadByte();
return a|(b<<8);
}
uint32 Scumm::fileReadDwordBE() {
uint b = fileReadWordBE();
uint a = fileReadWordBE();
return (b<<16)|a;
}
byte *Scumm::alloc(int size) {
byte *me = (byte*)::calloc(size+4,1);
if (me==NULL)
return NULL;
*((uint32*)me) = 0xDEADBEEF;
return me + 4;
}
void Scumm::free(void *mem) {
if (mem) {
byte *me = (byte*)mem - 4;
if ( *((uint32*)me) != 0xDEADBEEF) {
error("Freeing invalid block.");
}
*((uint32*)me) = 0xC007CAFE;
::free(me);
}
}
bool Scumm::checkFixedDisk() {
return true;
}
#ifdef NEED_STRDUP
char *strdup(const char *s) {
int len = strlen(s) + 1;
char *d = (char*)malloc(len);
if (d) memcpy(d, s, len);
return d;
}
#endif /* NEED_STRDUP */
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