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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
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. See the file
COPYING included with this distribution for more information.
*/
#include "BZipFileDevice.h"
#include <bzlib.h>
#include <iostream>
#include "base/Debug.h"
BZipFileDevice::BZipFileDevice(QString fileName) :
m_fileName(fileName),
m_file(0),
m_bzFile(0),
m_atEnd(true),
m_ok(true)
{
}
BZipFileDevice::~BZipFileDevice()
{
// SVDEBUG << "BZipFileDevice::~BZipFileDevice(" << m_fileName << ")" << endl;
if (m_bzFile) close();
}
bool
BZipFileDevice::isOK() const
{
return m_ok;
}
bool
BZipFileDevice::open(OpenMode mode)
{
setErrorString("");
if (m_bzFile) {
setErrorString(tr("File is already open"));
return false;
}
if (mode & Append) {
setErrorString(tr("Append mode not supported"));
m_ok = false;
return false;
}
if ((mode & (ReadOnly | WriteOnly)) == 0) {
setErrorString(tr("File access mode not specified"));
m_ok = false;
return false;
}
if ((mode & ReadOnly) && (mode & WriteOnly)) {
setErrorString(tr("Read and write modes both specified"));
m_ok = false;
return false;
}
if (mode & WriteOnly) {
m_file = fopen(m_fileName.toLocal8Bit().data(), "wb");
if (!m_file) {
setErrorString(tr("Failed to open file for writing"));
m_ok = false;
return false;
}
int bzError = BZ_OK;
m_bzFile = BZ2_bzWriteOpen(&bzError, m_file, 9, 0, 0);
if (!m_bzFile) {
fclose(m_file);
m_file = 0;
setErrorString(tr("Failed to open bzip2 stream for writing"));
m_ok = false;
return false;
}
// cerr << "BZipFileDevice: opened \"" << m_fileName << "\" for writing" << endl;
setErrorString(QString());
setOpenMode(mode);
return true;
}
if (mode & ReadOnly) {
m_file = fopen(m_fileName.toLocal8Bit().data(), "rb");
if (!m_file) {
setErrorString(tr("Failed to open file for reading"));
m_ok = false;
return false;
}
int bzError = BZ_OK;
m_bzFile = BZ2_bzReadOpen(&bzError, m_file, 0, 0, NULL, 0);
if (!m_bzFile) {
fclose(m_file);
m_file = 0;
setErrorString(tr("Failed to open bzip2 stream for reading"));
m_ok = false;
return false;
}
// cerr << "BZipFileDevice: opened \"" << m_fileName << "\" for reading" << endl;
m_atEnd = false;
setErrorString(QString());
setOpenMode(mode);
return true;
}
setErrorString(tr("Internal error (open for neither read nor write)"));
m_ok = false;
return false;
}
void
BZipFileDevice::close()
{
if (!m_bzFile) {
setErrorString(tr("File not open"));
m_ok = false;
return;
}
int bzError = BZ_OK;
if (openMode() & WriteOnly) {
unsigned int in = 0, out = 0;
BZ2_bzWriteClose(&bzError, m_bzFile, 0, &in, &out);
// cerr << "Wrote bzip2 stream (in=" << in << ", out=" << out << ")" << endl;
if (bzError != BZ_OK) {
setErrorString(tr("bzip2 stream write close error"));
}
fclose(m_file);
m_bzFile = 0;
m_file = 0;
m_ok = false;
return;
}
if (openMode() & ReadOnly) {
BZ2_bzReadClose(&bzError, m_bzFile);
if (bzError != BZ_OK) {
setErrorString(tr("bzip2 stream read close error"));
}
fclose(m_file);
m_bzFile = 0;
m_file = 0;
m_ok = false;
return;
}
setErrorString(tr("Internal error (close for neither read nor write)"));
return;
}
qint64
BZipFileDevice::readData(char *data, qint64 maxSize)
{
if (m_atEnd) return 0;
int bzError = BZ_OK;
int read = BZ2_bzRead(&bzError, m_bzFile, data, int(maxSize));
// SVDEBUG << "BZipFileDevice::readData: requested " << maxSize << ", read " << read << endl;
if (bzError != BZ_OK) {
if (bzError != BZ_STREAM_END) {
cerr << "BZipFileDevice::readData: error condition" << endl;
setErrorString(tr("bzip2 stream read error"));
m_ok = false;
return -1;
} else {
// SVDEBUG << "BZipFileDevice::readData: reached end of file" << endl;
m_atEnd = true;
}
}
return read;
}
qint64
BZipFileDevice::writeData(const char *data, qint64 maxSize)
{
int bzError = BZ_OK;
BZ2_bzWrite(&bzError, m_bzFile, (void *)data, int(maxSize));
// SVDEBUG << "BZipFileDevice::writeData: " << maxSize << " to write" << endl;
if (bzError != BZ_OK) {
cerr << "BZipFileDevice::writeData: error condition" << endl;
setErrorString("bzip2 stream write error");
m_ok = false;
return -1;
}
// SVDEBUG << "BZipFileDevice::writeData: wrote " << maxSize << endl;
return maxSize;
}
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