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/*
* Copyright (C) 2004-2012 Geometer Plus <[email protected]>
*
* 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.
*/
#include <cstring>
#include <algorithm>
#include <ZLFile.h>
#include <ZLResource.h>
#include <ZLZDecompressor.h>
#include "PalmDocStream.h"
#include "DocDecompressor.h"
#include "HuffDecompressor.h"
PalmDocStream::PalmDocStream(const ZLFile &file) : PalmDocLikeStream(file) {
}
PalmDocStream::~PalmDocStream() {
close();
}
bool PalmDocStream::processRecord() {
const std::size_t currentOffset = recordOffset(myRecordIndex);
if (currentOffset < myBase->offset()) {
return false;
}
myBase->seek(currentOffset, true);
const std::size_t nextOffset = recordOffset(myRecordIndex + 1);
if (nextOffset < currentOffset) {
return false;
}
const unsigned short recordSize = nextOffset - currentOffset;
switch(myCompressionVersion) {
case 17480://'DH' // HuffCDic compression
myBufferLength = myHuffDecompressorPtr->decompress(*myBase, myBuffer, recordSize, myMaxRecordSize);
//if (myHuffDecompressorPtr->error()) {
// myErrorCode = ERROR_UNKNOWN;
//}
break;
case 2: // PalmDoc compression
myBufferLength = DocDecompressor().decompress(*myBase, myBuffer, recordSize, myMaxRecordSize);
break;
case 1: // No compression
myBufferLength = myBase->read(myBuffer, std::min(recordSize, myMaxRecordSize));
break;
}
myBufferOffset = 0;
return true;
}
bool PalmDocStream::processZeroRecord() {
// Uses with offset presetting to zero record offset value
PdbUtil::readUnsignedShort(*myBase, myCompressionVersion); // myBase offset: ^ + 2
switch (myCompressionVersion) {
case 1:
case 2:
case 17480:
break;
default:
myErrorCode = ERROR_COMPRESSION;
return false;
}
myBase->seek(2, false); // myBase offset: ^ + 4
PdbUtil::readUnsignedLongBE(*myBase, myTextLength); // myBase offset: ^ + 8
PdbUtil::readUnsignedShort(*myBase, myTextRecordNumber); // myBase offset: ^ + 10
unsigned short endSectionIndex = header().Offsets.size();
myMaxRecordIndex = std::min(myTextRecordNumber, (unsigned short)(endSectionIndex - 1));
//TODO Insert in this point error message about uncompatible records and numRecords from Header
PdbUtil::readUnsignedShort(*myBase, myMaxRecordSize); // myBase offset: ^ + 12
if (myMaxRecordSize == 0) {
myErrorCode = ERROR_UNKNOWN;
return false;
}
/*
std::cerr << "PalmDocStream::processRecord0():\n";
std::cerr << "PDB header indentificator : " << header().Id << "\n";
std::cerr << "PDB file system: sizeof opened : " << myBaseSize << "\n";
std::cerr << "PDB header/record[0] max index : " << myMaxRecordIndex << "\n";
std::cerr << "PDB record[0][0..2] compression : " << myCompressionVersion << "\n";
std::cerr << "PDB record[0][2..4] spare : " << mySpare << "\n";
std::cerr << "PDB record[0][4..8] text length : " << myTextLength << "\n";
std::cerr << "PDB record[0][8..10] text records : " << myTextRecords << "\n";
std::cerr << "PDB record[0][10..12] max record size: " << myMaxRecordSize << "\n";
*/
if (header().Id == "BOOKMOBI") {
unsigned short encrypted = 0;
PdbUtil::readUnsignedShort(*myBase, encrypted); // myBase offset: ^ + 14
if (encrypted) { //Always = 2, if encrypted
myErrorCode = ERROR_ENCRYPTION;
return false;
}
} else {
myBase->seek(2, false);
}
if (myCompressionVersion == 17480) {
unsigned long mobiHeaderLength;
unsigned long huffSectionIndex;
unsigned long huffSectionNumber;
unsigned short extraFlags;
unsigned long initialOffset = header().Offsets[0]; // myBase offset: ^
myBase->seek(6, false); // myBase offset: ^ + 20
PdbUtil::readUnsignedLongBE(*myBase, mobiHeaderLength); // myBase offset: ^ + 24
myBase->seek(0x70 - 24, false); // myBase offset: ^ + 102 (0x70)
PdbUtil::readUnsignedLongBE(*myBase, huffSectionIndex); // myBase offset: ^ + 106 (0x74)
PdbUtil::readUnsignedLongBE(*myBase, huffSectionNumber); // myBase offset: ^ + 110 (0x78)
if (mobiHeaderLength >= 244) {
myBase->seek(0xF2 - 0x78, false); // myBase offset: ^ + 242 (0xF2)
PdbUtil::readUnsignedShort(*myBase, extraFlags); // myBase offset: ^ + 244 (0xF4)
} else {
extraFlags = 0;
}
/*
std::cerr << "mobi header length: " << mobiHeaderLength << "\n";
std::cerr << "Huff's start record : " << huffSectionIndex << " from " << endSectionIndex - 1 << "\n";
std::cerr << "Huff's records number: " << huffSectionNumber << "\n";
std::cerr << "Huff's extraFlags : " << extraFlags << "\n";
*/
const unsigned long endHuffSectionIndex = huffSectionIndex + huffSectionNumber;
if (endHuffSectionIndex > endSectionIndex || huffSectionNumber <= 1) {
myErrorCode = ERROR_COMPRESSION;
return false;
}
const unsigned long endHuffDataOffset = recordOffset(endHuffSectionIndex);
std::vector<unsigned long>::const_iterator beginHuffSectionOffsetIt = header().Offsets.begin() + huffSectionIndex;
// point to first Huff section
std::vector<unsigned long>::const_iterator endHuffSectionOffsetIt = header().Offsets.begin() + endHuffSectionIndex;
// point behind last Huff section
myHuffDecompressorPtr = new HuffDecompressor(*myBase, beginHuffSectionOffsetIt, endHuffSectionOffsetIt, endHuffDataOffset, extraFlags);
myBase->seek(initialOffset, true); // myBase offset: ^ + 14
}
return true;
}
bool PalmDocStream::hasExtraSections() const {
return myMaxRecordIndex < header().Offsets.size() - 1;
}
std::pair<int,int> PalmDocStream::imageLocation(const PdbHeader &header, int index) const {
index += myMaxRecordIndex + 1;
int recordNumber = header.Offsets.size();
if (index > recordNumber - 1) {
return std::make_pair(-1, -1);
} else {
int start = header.Offsets[index];
int end = (index < recordNumber - 1) ?
header.Offsets[index + 1] : myBase->offset();
return std::make_pair(start, end - start);
}
}
int PalmDocStream::firstImageLocationIndex(const std::string &fileName) {
shared_ptr<ZLInputStream> fileStream = ZLFile(fileName).inputStream();
if (fileStream.isNull() || !fileStream->open()) {
return -1;
}
bool found = false;
int index = 0;
char bu[5] = { 0 };
std::pair<int,int> firstImageLocation = imageLocation(header(), 0);
fileStream->seek(firstImageLocation.first, false);
while ((firstImageLocation.first > 0) && (firstImageLocation.second > 0)) {
if (firstImageLocation.second > 4) {
fileStream->read(bu, 4);
static const char jpegStart[2] = { (char)0xFF, (char)0xd8 };
if (std::strncmp(bu, "BM", 2) == 0 ||
std::strncmp(bu, "GIF8", 4) == 0 ||
std::strncmp(bu, jpegStart, 2) == 0) {
found = true;
break;
}
fileStream->seek(firstImageLocation.second - 4, false);
} else {
fileStream->seek(firstImageLocation.second, false);
}
index++;
firstImageLocation = imageLocation(header(), index);
}
fileStream->close();
return found ? index : -1;
}
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