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/* |
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Copyright (C) 2005-2014 Sergey A. Tachenov |
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|
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This file is part of QuaZIP. |
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|
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QuaZIP is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License as published by |
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the Free Software Foundation, either version 2.1 of the License, or |
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(at your option) any later version. |
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|
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QuaZIP is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public License |
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along with QuaZIP. If not, see <http://www.gnu.org/licenses/>. |
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|
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See COPYING file for the full LGPL text. |
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|
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Original ZIP package is copyrighted by Gilles Vollant and contributors, |
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see quazip/(un)zip.h files for details. Basically it's the zlib license. |
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*/ |
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|
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#include "quaziodevice.h" |
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|
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#define QUAZIO_INBUFSIZE 4096 |
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#define QUAZIO_OUTBUFSIZE 4096 |
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|
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/// \cond internal |
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class QuaZIODevicePrivate { |
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friend class QuaZIODevice; |
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QuaZIODevicePrivate(QIODevice *io); |
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~QuaZIODevicePrivate(); |
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QIODevice *io; |
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z_stream zins; |
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z_stream zouts; |
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char *inBuf; |
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int inBufPos; |
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int inBufSize; |
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char *outBuf; |
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int outBufPos; |
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int outBufSize; |
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bool zBufError; |
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bool atEnd; |
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int doFlush(QString &error); |
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}; |
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|
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QuaZIODevicePrivate::QuaZIODevicePrivate(QIODevice *io): |
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io(io), |
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inBuf(NULL), |
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inBufPos(0), |
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inBufSize(0), |
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outBuf(NULL), |
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outBufPos(0), |
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outBufSize(0), |
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zBufError(false), |
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atEnd(false) |
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{ |
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zins.zalloc = (alloc_func) NULL; |
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zins.zfree = (free_func) NULL; |
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zins.opaque = NULL; |
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zouts.zalloc = (alloc_func) NULL; |
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zouts.zfree = (free_func) NULL; |
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zouts.opaque = NULL; |
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inBuf = new char[QUAZIO_INBUFSIZE]; |
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outBuf = new char[QUAZIO_OUTBUFSIZE]; |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_OUTPUT |
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debug.setFileName("debug.out"); |
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debug.open(QIODevice::WriteOnly); |
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#endif |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_INPUT |
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indebug.setFileName("debug.in"); |
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indebug.open(QIODevice::WriteOnly); |
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#endif |
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} |
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|
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QuaZIODevicePrivate::~QuaZIODevicePrivate() |
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{ |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_OUTPUT |
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debug.close(); |
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#endif |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_INPUT |
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indebug.close(); |
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#endif |
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if (inBuf != NULL) |
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delete[] inBuf; |
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if (outBuf != NULL) |
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delete[] outBuf; |
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} |
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|
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int QuaZIODevicePrivate::doFlush(QString &error) |
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{ |
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int flushed = 0; |
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while (outBufPos < outBufSize) { |
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int more = io->write(outBuf + outBufPos, outBufSize - outBufPos); |
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if (more == -1) { |
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error = io->errorString(); |
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return -1; |
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} |
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if (more == 0) |
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break; |
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outBufPos += more; |
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flushed += more; |
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} |
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if (outBufPos == outBufSize) { |
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outBufPos = outBufSize = 0; |
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} |
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return flushed; |
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} |
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|
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/// \endcond |
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|
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// #define QUAZIP_ZIODEVICE_DEBUG_OUTPUT |
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// #define QUAZIP_ZIODEVICE_DEBUG_INPUT |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_OUTPUT |
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#include <QFile> |
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static QFile debug; |
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#endif |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_INPUT |
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#include <QFile> |
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static QFile indebug; |
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#endif |
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|
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QuaZIODevice::QuaZIODevice(QIODevice *io, QObject *parent): |
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QIODevice(parent), |
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d(new QuaZIODevicePrivate(io)) |
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{ |
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connect(io, SIGNAL(readyRead()), SIGNAL(readyRead())); |
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} |
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|
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QuaZIODevice::~QuaZIODevice() |
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{ |
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if (isOpen()) |
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close(); |
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delete d; |
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} |
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|
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QIODevice *QuaZIODevice::getIoDevice() const |
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{ |
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return d->io; |
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} |
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|
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bool QuaZIODevice::open(QIODevice::OpenMode mode) |
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{ |
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if ((mode & QIODevice::Append) != 0) { |
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setErrorString(trUtf8("QIODevice::Append is not supported for" |
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" QuaZIODevice")); |
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return false; |
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} |
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if ((mode & QIODevice::ReadWrite) == QIODevice::ReadWrite) { |
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setErrorString(trUtf8("QIODevice::ReadWrite is not supported for" |
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" QuaZIODevice")); |
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return false; |
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} |
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if ((mode & QIODevice::ReadOnly) != 0) { |
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if (inflateInit(&d->zins) != Z_OK) { |
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setErrorString(d->zins.msg); |
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return false; |
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} |
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} |
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if ((mode & QIODevice::WriteOnly) != 0) { |
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if (deflateInit(&d->zouts, Z_DEFAULT_COMPRESSION) != Z_OK) { |
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setErrorString(d->zouts.msg); |
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return false; |
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} |
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} |
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return QIODevice::open(mode); |
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} |
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|
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void QuaZIODevice::close() |
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{ |
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if ((openMode() & QIODevice::ReadOnly) != 0) { |
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if (inflateEnd(&d->zins) != Z_OK) { |
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setErrorString(d->zins.msg); |
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} |
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} |
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if ((openMode() & QIODevice::WriteOnly) != 0) { |
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flush(); |
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if (deflateEnd(&d->zouts) != Z_OK) { |
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setErrorString(d->zouts.msg); |
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} |
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} |
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QIODevice::close(); |
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} |
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|
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qint64 QuaZIODevice::readData(char *data, qint64 maxSize) |
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{ |
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int read = 0; |
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while (read < maxSize) { |
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if (d->inBufPos == d->inBufSize) { |
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d->inBufPos = 0; |
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d->inBufSize = d->io->read(d->inBuf, QUAZIO_INBUFSIZE); |
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if (d->inBufSize == -1) { |
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d->inBufSize = 0; |
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setErrorString(d->io->errorString()); |
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return -1; |
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} |
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if (d->inBufSize == 0) |
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break; |
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} |
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while (read < maxSize && d->inBufPos < d->inBufSize) { |
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d->zins.next_in = (Bytef *) (d->inBuf + d->inBufPos); |
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d->zins.avail_in = d->inBufSize - d->inBufPos; |
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d->zins.next_out = (Bytef *) (data + read); |
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d->zins.avail_out = (uInt) (maxSize - read); // hope it's less than 2GB |
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int more = 0; |
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switch (inflate(&d->zins, Z_SYNC_FLUSH)) { |
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case Z_OK: |
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read = (char *) d->zins.next_out - data; |
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d->inBufPos = (char *) d->zins.next_in - d->inBuf; |
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break; |
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case Z_STREAM_END: |
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read = (char *) d->zins.next_out - data; |
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d->inBufPos = (char *) d->zins.next_in - d->inBuf; |
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d->atEnd = true; |
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return read; |
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case Z_BUF_ERROR: // this should never happen, but just in case |
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if (!d->zBufError) { |
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qWarning("Z_BUF_ERROR detected with %d/%d in/out, weird", |
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d->zins.avail_in, d->zins.avail_out); |
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d->zBufError = true; |
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} |
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memmove(d->inBuf, d->inBuf + d->inBufPos, d->inBufSize - d->inBufPos); |
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d->inBufSize -= d->inBufPos; |
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d->inBufPos = 0; |
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more = d->io->read(d->inBuf + d->inBufSize, QUAZIO_INBUFSIZE - d->inBufSize); |
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if (more == -1) { |
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setErrorString(d->io->errorString()); |
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return -1; |
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} |
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if (more == 0) |
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return read; |
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d->inBufSize += more; |
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break; |
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default: |
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setErrorString(QString::fromLocal8Bit(d->zins.msg)); |
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return -1; |
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} |
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} |
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} |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_INPUT |
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indebug.write(data, read); |
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#endif |
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return read; |
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} |
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|
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qint64 QuaZIODevice::writeData(const char *data, qint64 maxSize) |
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{ |
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int written = 0; |
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QString error; |
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if (d->doFlush(error) == -1) { |
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setErrorString(error); |
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return -1; |
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} |
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while (written < maxSize) { |
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// there is some data waiting in the output buffer |
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if (d->outBufPos < d->outBufSize) |
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return written; |
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d->zouts.next_in = (Bytef *) (data + written); |
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d->zouts.avail_in = (uInt) (maxSize - written); // hope it's less than 2GB |
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d->zouts.next_out = (Bytef *) d->outBuf; |
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d->zouts.avail_out = QUAZIO_OUTBUFSIZE; |
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switch (deflate(&d->zouts, Z_NO_FLUSH)) { |
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case Z_OK: |
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written = (char *) d->zouts.next_in - data; |
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d->outBufSize = (char *) d->zouts.next_out - d->outBuf; |
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break; |
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default: |
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setErrorString(QString::fromLocal8Bit(d->zouts.msg)); |
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return -1; |
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} |
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if (d->doFlush(error) == -1) { |
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setErrorString(error); |
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return -1; |
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} |
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} |
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#ifdef QUAZIP_ZIODEVICE_DEBUG_OUTPUT |
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debug.write(data, written); |
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#endif |
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return written; |
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} |
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|
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bool QuaZIODevice::flush() |
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{ |
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QString error; |
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if (d->doFlush(error) < 0) { |
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setErrorString(error); |
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return false; |
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} |
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// can't flush buffer, some data is still waiting |
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if (d->outBufPos < d->outBufSize) |
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return true; |
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Bytef c = 0; |
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d->zouts.next_in = &c; // fake input buffer |
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d->zouts.avail_in = 0; // of zero size |
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do { |
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d->zouts.next_out = (Bytef *) d->outBuf; |
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d->zouts.avail_out = QUAZIO_OUTBUFSIZE; |
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switch (deflate(&d->zouts, Z_SYNC_FLUSH)) { |
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case Z_OK: |
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d->outBufSize = (char *) d->zouts.next_out - d->outBuf; |
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if (d->doFlush(error) < 0) { |
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setErrorString(error); |
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return false; |
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} |
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if (d->outBufPos < d->outBufSize) |
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return true; |
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break; |
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case Z_BUF_ERROR: // nothing to write? |
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return true; |
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default: |
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setErrorString(QString::fromLocal8Bit(d->zouts.msg)); |
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return false; |
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} |
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} while (d->zouts.avail_out == 0); |
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return true; |
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} |
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|
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bool QuaZIODevice::isSequential() const |
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{ |
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return true; |
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} |
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|
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bool QuaZIODevice::atEnd() const |
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{ |
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// Here we MUST check QIODevice::bytesAvailable() because WE |
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// might have reached the end, but QIODevice didn't-- |
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// it could have simply pre-buffered all remaining data. |
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return (openMode() == NotOpen) || (QIODevice::bytesAvailable() == 0 && d->atEnd); |
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} |
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|
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qint64 QuaZIODevice::bytesAvailable() const |
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{ |
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// If we haven't recevied Z_STREAM_END, it means that |
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// we have at least one more input byte available. |
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// Plus whatever QIODevice has buffered. |
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return (d->atEnd ? 0 : 1) + QIODevice::bytesAvailable(); |
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} |
