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/*
* Copyright (C) 2004-2012 Geometer Plus <contact@geometerplus.com>
*
* 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 <ZLFile.h>
#include "PdbStream.h"
PdbStream::PdbStream(const ZLFile &file) : myBase(file.inputStream()) {
myBuffer = 0;
}
PdbStream::~PdbStream() {
}
bool PdbStream::open() {
close();
if (myBase.isNull() || !myBase->open() || !myHeader.read(myBase)) {
return false;
}
// myBase offset: startOffset + 78 + 8 * records number ( myHeader.Offsets.size() )
myBase->seek(myHeader.Offsets[0], true);
// myBase offset: Offset[0] - zero record
myBufferLength = 0;
myBufferOffset = 0;
myOffset = 0;
return true;
}
std::size_t PdbStream::read(char *buffer, std::size_t maxSize) {
std::size_t realSize = 0;
while (realSize < maxSize) {
if (!fillBuffer()) {
break;
}
std::size_t size = std::min((std::size_t)(maxSize - realSize), (std::size_t)(myBufferLength - myBufferOffset));
if (size > 0) {
if (buffer != 0) {
std::memcpy(buffer + realSize, myBuffer + myBufferOffset, size);
}
realSize += size;
myBufferOffset += size;
}
}
myOffset += realSize;
return realSize;
}
void PdbStream::close() {
if (!myBase.isNull()) {
myBase->close();
}
if (myBuffer != 0) {
delete[] myBuffer;
myBuffer = 0;
}
}
void PdbStream::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 PdbStream::offset() const {
return myOffset;
}
std::size_t PdbStream::sizeOfOpened() {
// TODO: implement
return 0;
}
std::size_t PdbStream::recordOffset(std::size_t index) const {
return index < myHeader.Offsets.size() ?
myHeader.Offsets[index] : myBase->sizeOfOpened();
}
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