mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-27 20:28:27 +00:00
275 lines
6.2 KiB
C++
275 lines
6.2 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "scumm/util.h"
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#include "common/util.h"
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namespace Scumm {
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#pragma mark -
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#pragma mark --- ScummFile ---
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#pragma mark -
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ScummFile::ScummFile() : _encbyte(0), _subFileStart(0), _subFileLen(0) {
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}
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void ScummFile::setEnc(byte value) {
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_encbyte = value;
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}
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void ScummFile::setSubfileRange(uint32 start, uint32 len) {
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// TODO: Add sanity checks
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const uint32 fileSize = File::size();
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assert(start <= fileSize);
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assert(start + len <= fileSize);
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_subFileStart = start;
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_subFileLen = len;
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seek(0, SEEK_SET);
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}
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void ScummFile::resetSubfile() {
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_subFileStart = 0;
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_subFileLen = 0;
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seek(0, SEEK_SET);
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}
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bool ScummFile::open(const char *filename, AccessMode mode) {
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if (File::open(filename, mode)) {
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resetSubfile();
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return true;
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} else {
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return false;
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}
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}
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bool ScummFile::openSubFile(const char *filename) {
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assert(isOpen());
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// Disable the XOR encryption and reset any current subfile range
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setEnc(0);
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resetSubfile();
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// Read in the filename table and look for the specified file
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unsigned long file_off, file_len;
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char file_name[0x20+1];
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unsigned long i;
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// Get the length of the data file to use for consistency checks
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const uint32 data_file_len = size();
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// Read offset and length to the file records */
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const uint32 file_record_off = readUint32BE();
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const uint32 file_record_len = readUint32BE();
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// Do a quick check to make sure the offset and length are good
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if (file_record_off + file_record_len > data_file_len) {
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return false;
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}
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// Do a little consistancy check on file_record_length
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if (file_record_len % 0x28) {
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return false;
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}
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// Scan through the files
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for (i = 0; i < file_record_len; i += 0x28) {
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// read a file record
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seek(file_record_off + i, SEEK_SET);
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file_off = readUint32BE();
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file_len = readUint32BE();
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read(file_name, 0x20);
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file_name[0x20] = 0;
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assert(file_name[0]);
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//debug(7, " extracting \'%s\'", file_name);
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// Consistency check. make sure the file data is in the file
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if (file_off + file_len > data_file_len) {
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return false;
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}
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if (scumm_stricmp(file_name, filename) == 0) {
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// We got a match!
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setSubfileRange(file_off, file_len);
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return true;
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}
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}
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return false;
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}
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bool ScummFile::eof() {
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return _subFileLen ? (pos() >= _subFileLen) : File::eof();
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}
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uint32 ScummFile::pos() {
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return File::pos() - _subFileStart;
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}
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uint32 ScummFile::size() {
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return _subFileLen ? _subFileLen : File::size();
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}
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void ScummFile::seek(int32 offs, int whence) {
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if (_subFileLen) {
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// Constrain the seek to the subfile
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switch (whence) {
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case SEEK_END:
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offs = _subFileStart + _subFileLen - offs;
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break;
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case SEEK_SET:
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offs += _subFileStart;
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break;
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case SEEK_CUR:
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offs += File::pos();
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break;
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}
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assert((int32)_subFileStart <= offs && offs <= (int32)(_subFileStart + _subFileLen));
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whence = SEEK_SET;
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}
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File::seek(offs, whence);
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}
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uint32 ScummFile::read(void *ptr, uint32 len) {
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uint32 realLen;
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if (_subFileLen) {
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// Limit the amount we read by the subfile boundaries.
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const uint32 curPos = pos();
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assert(_subFileLen >= curPos);
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uint32 newPos = curPos + len;
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if (newPos > _subFileLen) {
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len = _subFileLen - curPos;
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_ioFailed = true;
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}
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}
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realLen = File::read(ptr, len);
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// If an encryption byte was specified, XOR the data we just read by it.
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// This simple kind of "encryption" was used by some of the older SCUMM
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// games.
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if (_encbyte) {
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byte *p = (byte *)ptr;
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byte *end = p + realLen;
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while (p < end)
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*p++ ^= _encbyte;
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}
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return realLen;
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}
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uint32 ScummFile::write(const void *, uint32) {
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error("ScummFile does not support writing!");
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return 0;
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}
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#pragma mark -
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#pragma mark --- Utilities ---
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#pragma mark -
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void checkRange(int max, int min, int no, const char *str) {
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if (no < min || no > max) {
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char buf[256];
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snprintf(buf, sizeof(buf), str, no);
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error("Value %d is out of bounds (%d,%d) (%s)", no, min, max, buf);
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}
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}
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/**
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* Convert an old style direction to a new style one (angle),
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*/
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int newDirToOldDir(int dir) {
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if (dir >= 71 && dir <= 109)
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return 1;
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if (dir >= 109 && dir <= 251)
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return 2;
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if (dir >= 251 && dir <= 289)
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return 0;
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return 3;
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}
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/**
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* Convert an new style (angle) direction to an old style one.
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*/
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int oldDirToNewDir(int dir) {
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assert(0 <= dir && dir <= 3);
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const int new_dir_table[4] = { 270, 90, 180, 0 };
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return new_dir_table[dir];
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}
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/**
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* Convert an angle to a simple direction.
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*/
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int toSimpleDir(int dirType, int dir) {
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if (dirType) {
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const int16 directions[] = { 22, 72, 107, 157, 202, 252, 287, 337 };
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for (int i = 0; i < 7; i++)
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if (dir >= directions[i] && dir <= directions[i+1])
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return i+1;
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} else {
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const int16 directions[] = { 71, 109, 251, 289 };
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for (int i = 0; i < 3; i++)
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if (dir >= directions[i] && dir <= directions[i+1])
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return i+1;
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}
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return 0;
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}
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/**
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* Convert a simple direction to an angle.
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*/
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int fromSimpleDir(int dirType, int dir) {
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if (dirType)
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return dir * 45;
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else
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return dir * 90;
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}
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/**
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* Normalize the given angle - that means, ensure it is positive, and
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* change it to the closest multiple of 45 degree by abusing toSimpleDir.
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*/
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int normalizeAngle(int angle) {
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int temp;
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temp = (angle + 360) % 360;
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return toSimpleDir(1, temp) * 45;
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}
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const char *tag2str(uint32 tag) {
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static char str[5];
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str[0] = (char)(tag >> 24);
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str[1] = (char)(tag >> 16);
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str[2] = (char)(tag >> 8);
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str[3] = (char)tag;
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str[4] = '\0';
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return str;
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}
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} // End of namespace Scumm
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