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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "common/file.h"
#include "common/util.h"
#include "agi/wagparser.h"
namespace Agi {
WagProperty::WagProperty() {
setDefaults();
}
WagProperty::~WagProperty() {
deleteData();
}
WagProperty::WagProperty(const WagProperty &other) {
deepCopy(other);
}
WagProperty &WagProperty::operator=(const WagProperty &other) {
if (&other != this) deepCopy(other); // Don't do self-assignment
return *this;
}
void WagProperty::deepCopy(const WagProperty &other) {
_readOk = other._readOk;
_propCode = other._propCode;
_propType = other._propType;
_propNum = other._propNum;
_propSize = other._propSize;
deleteData(); // Delete old data (If any) and set _propData to NULL
if (other._propData != NULL) {
_propData = new char[other._propSize + 1UL]; // Allocate space for property's data plus trailing zero
memcpy(_propData, other._propData, other._propSize + 1UL); // Copy the whole thing
}
}
bool WagProperty::read(Common::SeekableReadStream &stream) {
// First read the property's header
_propCode = (enum WagPropertyCode) stream.readByte();
_propType = (enum WagPropertyType) stream.readByte();
_propNum = stream.readByte();
_propSize = stream.readUint16LE();
if (stream.ioFailed()) { // Check that we got the whole header
_readOk = false;
return _readOk;
}
// Then read the property's data
deleteData(); // Delete old data (If any)
_propData = new char[_propSize + 1UL]; // Allocate space for property's data plus trailing zero
uint32 readBytes = stream.read(_propData, _propSize); // Read the data in
_propData[_propSize] = 0; // Set the trailing zero for easy C-style string access
_readOk = (_propData != NULL && readBytes == _propSize); // Check that we got the whole data
return _readOk;
}
void WagProperty::clear() {
deleteData();
setDefaults();
}
void WagProperty::setDefaults() {
_readOk = false;
_propCode = PC_UNDEFINED;
_propType = PT_UNDEFINED;
_propNum = 0;
_propSize = 0;
_propData = NULL;
}
void WagProperty::deleteData() {
if (_propData != NULL) {
delete _propData;
_propData = NULL;
}
}
WagFileParser::WagFileParser() :
_parsedOk(false) {
}
WagFileParser::~WagFileParser() {
}
bool WagFileParser::checkAgiVersionProperty(const WagProperty &version) const {
if (version.getCode() == WagProperty::PC_INTVERSION && // Must be AGI interpreter version property
version.getSize() >= 3 && // Need at least three characters for a version number like "X.Y"
isdigit(version.getData()[0]) && // And the first character must be a digit
(version.getData()[1] == ',' || version.getData()[1] == '.')) { // And the second a comma or a period
for (int i = 2; i < version.getSize(); i++) // And the rest must all be digits
if (!isdigit(version.getData()[i]))
return false; // Bail out if found a non-digit after the decimal point
return true;
} else // Didn't pass the preliminary test so fails
return false;
}
uint16 WagFileParser::convertToAgiVersionNumber(const WagProperty &version) {
// Examples of the conversion: "2.44" -> 0x2440, "2.917" -> 0x2917, "3.002086" -> 0x3086.
if (checkAgiVersionProperty(version)) { // Check that the string is a valid AGI interpreter version string
// Convert first ascii digit to an integer and put it in the fourth nibble (Bits 12...15) of the version number
// and at the same time set all other nibbles to zero.
uint16 agiVerNum = ((uint16) (version.getData()[0] - '0')) << (3 * 4);
// Convert at most three least significant digits of the version number's minor part
// (i.e. the part after the decimal point) and put them in order to the third, second
// and the first nibble of the version number. Just to clarify version.getSize() - 2
// is the number of digits after the decimal point.
int32 digitCount = MIN<int32>(3, ((int32) version.getSize()) - 2); // How many digits left to convert
for (int i = 0; i < digitCount; i++)
agiVerNum |= ((uint16) (version.getData()[version.getSize() - digitCount + i] - '0')) << ((2 - i) * 4);
debug(3, "WagFileParser: Converted AGI version from string %s to number 0x%x", version.getData(), agiVerNum);
return agiVerNum;
} else // Not a valid AGI interpreter version string
return 0; // Can't convert, so failure
}
bool WagFileParser::checkWagVersion(Common::SeekableReadStream &stream) {
if (stream.size() >= WINAGI_VERSION_LENGTH) { // Stream has space to contain the WinAGI version string
// Read the last WINAGI_VERSION_LENGTH bytes of the stream and make a string out of it
char str[WINAGI_VERSION_LENGTH+1]; // Allocate space for the trailing zero also
uint32 oldStreamPos = stream.pos(); // Save the old stream position
stream.seek(stream.size() - WINAGI_VERSION_LENGTH);
uint32 readBytes = stream.read(str, WINAGI_VERSION_LENGTH);
stream.seek(oldStreamPos); // Seek back to the old stream position
str[readBytes] = 0; // Set the trailing zero to finish the C-style string
if (readBytes != WINAGI_VERSION_LENGTH) { // Check that we got the whole version string
debug(3, "WagFileParser::checkWagVersion: Error reading WAG file version from stream");
return false;
}
debug(3, "WagFileParser::checkWagVersion: Read WinAGI version string (\"%s\")", str);
// Check that the WinAGI version string is one of the two version strings
// WinAGI 1.1.21 recognizes as acceptable in the end of a *.wag file.
// Note that they are all of length 16 and are padded with spaces to be that long.
return scumm_stricmp(str, "WINAGI v1.0 ") == 0 ||
scumm_stricmp(str, "1.0 BETA ") == 0;
} else { // Stream is too small to contain the WinAGI version string
debug(3, "WagFileParser::checkWagVersion: Stream is too small to contain a valid WAG file");
return false;
}
}
bool WagFileParser::parse(const char *filename) {
Common::File file;
WagProperty property; // Temporary property used for reading
Common::MemoryReadStream *stream = NULL; // The file is to be read fully into memory and handled using this
_parsedOk = false; // We haven't parsed the file yet
if (file.open(filename)) { // Open the file
stream = file.readStream(file.size()); // Read the file into memory
if (stream != NULL && stream->size() == file.size()) { // Check that the whole file was read into memory
if (checkWagVersion(*stream)) { // Check that WinAGI version string is valid
// It seems we've got a valid *.wag file so let's parse its properties from the start.
stream->seek(0); // Rewind the stream
if (!_propList.empty()) _propList.clear(); // Clear out old properties (If any)
do { // Parse the properties
if (property.read(*stream)) { // Read the property and check it was read ok
_propList.push_back(property); // Add read property to properties list
debug(4, "WagFileParser::parse: Read property with code %d, type %d, number %d, size %d, data \"%s\"",
property.getCode(), property.getType(), property.getNumber(), property.getSize(), property.getData());
} else // Reading failed, let's bail out
break;
} while (!endOfProperties(*stream)); // Loop until the end of properties
// File was parsed successfully only if we got to the end of properties
// and all the properties were read successfully (Also the last).
_parsedOk = endOfProperties(*stream) && property.readOk();
if (!_parsedOk) // Error parsing stream
warning("Error parsing WAG file (%s). WAG file ignored", filename);
} else // Invalid WinAGI version string or it couldn't be read
warning("Invalid WAG file (%s) version or error reading it. WAG file ignored", filename);
} else // Couldn't fully read file into memory
warning("Error reading WAG file (%s) into memory. WAG file ignored", filename);
} else // Couldn't open file
warning("Couldn't open WAG file (%s). WAG file ignored", filename);
if (stream != NULL) delete stream; // If file was read into memory, deallocate that buffer
return _parsedOk;
}
const WagProperty *WagFileParser::getProperty(const WagProperty::WagPropertyCode code) const {
for (PropertyList::const_iterator iter = _propList.begin(); iter != _propList.end(); iter++)
if (iter->getCode() == code) return iter;
return NULL;
}
bool WagFileParser::endOfProperties(const Common::SeekableReadStream &stream) const {
return stream.pos() >= (stream.size() - WINAGI_VERSION_LENGTH);
}
} // End of namespace Agi
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