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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 <ZLZDecompressor.h>
#include "TcrStream.h"
TcrStream::TcrStream(const ZLFile &file) : myBase(file.inputStream()) {
}
TcrStream::~TcrStream() {
close();
}
bool TcrStream::open() {
close();
if (myBase.isNull() || !myBase->open()) {
return false;
}
char header[9];
if (myBase->read(header, 9) != 9 || std::strncmp(header, "!!8-Bit!!", 9) != 0) {
myBase->close();
return false;
}
unsigned char entryLength;
char entryBuffer[255];
for (int i = 0; i < 256; ++i) {
if (myBase->read((char*)&entryLength, 1) != 1 ||
(entryLength > 0 && myBase->read(entryBuffer, entryLength) != entryLength)) {
myBase->close();
return false;
}
if (entryLength > 0) {
myDictionary[i].append(entryBuffer, entryLength);
}
}
return true;
}
void TcrStream::close() {
if (!myBase.isNull()) {
myBase->close();
}
for (int i = 0; i < 256; ++i) {
myDictionary[i].erase();
}
myBuffer.erase();
}
std::size_t TcrStream::read(char *buffer, std::size_t maxSize) {
std::size_t size = 0;
if (myBuffer.length() > 0) {
size += std::min(maxSize, myBuffer.length());
if (buffer != 0) {
std::strncpy(buffer, myBuffer.data(), size);
}
myBuffer.erase(0, size);
}
while (size < maxSize) {
unsigned char index;
if (myBase->read((char*)&index, 1) != 1) {
break;
}
std::size_t len = myDictionary[index].length();
if (len > 0) {
std::size_t freeSize = maxSize - size;
if (buffer != 0) {
std::strncpy(buffer + size, myDictionary[index].data(), std::min(len, freeSize));
}
size += std::min(len, freeSize);
if (len > freeSize) {
myBuffer = myDictionary[index].substr(freeSize);
}
}
}
myOffset += size;
return size;
}
void TcrStream::seek(int offset, bool absoluteOffset) {
if (absoluteOffset) {
offset -= this->offset();
}
if (offset > 0) {
read(0, offset);
} else if (offset < 0) {
offset += this->offset();
open();
if (offset >= 0) {
read(0, offset);
}
}
}
std::size_t TcrStream::offset() const {
return myOffset;
}
std::size_t TcrStream::sizeOfOpened() {
// TODO: implement
return 0;
}
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