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Diffstat (limited to 'kopete/protocols/groupwise/libgroupwise/bytestream.cpp')
| -rw-r--r-- | kopete/protocols/groupwise/libgroupwise/bytestream.cpp | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/kopete/protocols/groupwise/libgroupwise/bytestream.cpp b/kopete/protocols/groupwise/libgroupwise/bytestream.cpp new file mode 100644 index 00000000..328c4a20 --- /dev/null +++ b/kopete/protocols/groupwise/libgroupwise/bytestream.cpp @@ -0,0 +1,269 @@ +/* + * bytestream.cpp - base class for bytestreams + * Copyright (C) 2003 Justin Karneges + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include"bytestream.h" + +// CS_NAMESPACE_BEGIN + +//! \class ByteStream bytestream.h +//! \brief Base class for "bytestreams" +//! +//! This class provides a basic framework for a "bytestream", here defined +//! as a bi-directional, asynchronous pipe of data. It can be used to create +//! several different kinds of bytestream-applications, such as a console or +//! TCP connection, or something more abstract like a security layer or tunnel, +//! all with the same interface. The provided functions make creating such +//! classes simpler. ByteStream is a pure-virtual class, so you do not use it +//! on its own, but instead through a subclass such as \a BSocket. +//! +//! The signals connectionClosed(), delayedCloseFinished(), readyRead(), +//! bytesWritten(), and error() serve the exact same function as those from +//! <A HREF="http://doc.trolltech.com/3.1/qsocket.html">QSocket</A>. +//! +//! The simplest way to create a ByteStream is to reimplement isOpen(), close(), +//! and tryWrite(). Call appendRead() whenever you want to make data available for +//! reading. ByteStream will take care of the buffers with regards to the caller, +//! and will call tryWrite() when the write buffer gains data. It will be your +//! job to call tryWrite() whenever it is acceptable to write more data to +//! the underlying system. +//! +//! If you need more advanced control, reimplement read(), write(), bytesAvailable(), +//! and/or bytesToWrite() as necessary. +//! +//! Use appendRead(), appendWrite(), takeRead(), and takeWrite() to modify the +//! buffers. If you have more advanced requirements, the buffers can be accessed +//! directly with readBuf() and writeBuf(). +//! +//! Also available are the static convenience functions ByteStream::appendArray() +//! and ByteStream::takeArray(), which make dealing with byte queues very easy. + +class ByteStream::Private +{ +public: + Private() {} + + QByteArray readBuf, writeBuf; +}; + +//! +//! Constructs a ByteStream object with parent \a parent. +ByteStream::ByteStream(QObject *parent) +:QObject(parent) +{ + d = new Private; +} + +//! +//! Destroys the object and frees allocated resources. +ByteStream::~ByteStream() +{ + delete d; +} + +//! +//! Returns TRUE if the stream is open, meaning that you can write to it. +bool ByteStream::isOpen() const +{ + return false; +} + +//! +//! Closes the stream. If there is data in the write buffer then it will be +//! written before actually closing the stream. Once all data has been written, +//! the delayedCloseFinished() signal will be emitted. +//! \sa delayedCloseFinished() +void ByteStream::close() +{ +} + +//! +//! Writes array \a a to the stream. +void ByteStream::write(const QByteArray &a) +{ + if(!isOpen()) + return; + + bool doWrite = bytesToWrite() == 0 ? true: false; + appendWrite(a); + if(doWrite) + tryWrite(); +} + +//! +//! Reads bytes \a bytes of data from the stream and returns them as an array. If \a bytes is 0, then +//! \a read will return all available data. +QByteArray ByteStream::read(int bytes) +{ + return takeRead(bytes); +} + +//! +//! Returns the number of bytes available for reading. +int ByteStream::bytesAvailable() const +{ + return d->readBuf.size(); +} + +//! +//! Returns the number of bytes that are waiting to be written. +int ByteStream::bytesToWrite() const +{ + return d->writeBuf.size(); +} + +//! +//! Writes string \a cs to the stream. +void ByteStream::write(const QCString &cs) +{ + QByteArray block(cs.length()); + memcpy(block.data(), cs.data(), block.size()); + write(block); +} + +//! +//! Clears the read buffer. +void ByteStream::clearReadBuffer() +{ + d->readBuf.resize(0); +} + +//! +//! Clears the write buffer. +void ByteStream::clearWriteBuffer() +{ + d->writeBuf.resize(0); +} + +//! +//! Appends \a block to the end of the read buffer. +void ByteStream::appendRead(const QByteArray &block) +{ + appendArray(&d->readBuf, block); +} + +//! +//! Appends \a block to the end of the write buffer. +void ByteStream::appendWrite(const QByteArray &block) +{ + appendArray(&d->writeBuf, block); +} + +//! +//! Returns \a size bytes from the start of the read buffer. +//! If \a size is 0, then all available data will be returned. +//! If \a del is TRUE, then the bytes are also removed. +QByteArray ByteStream::takeRead(int size, bool del) +{ + return takeArray(&d->readBuf, size, del); +} + +//! +//! Returns \a size bytes from the start of the write buffer. +//! If \a size is 0, then all available data will be returned. +//! If \a del is TRUE, then the bytes are also removed. +QByteArray ByteStream::takeWrite(int size, bool del) +{ + return takeArray(&d->writeBuf, size, del); +} + +//! +//! Returns a reference to the read buffer. +QByteArray & ByteStream::readBuf() +{ + return d->readBuf; +} + +//! +//! Returns a reference to the write buffer. +QByteArray & ByteStream::writeBuf() +{ + return d->writeBuf; +} + +//! +//! Attempts to try and write some bytes from the write buffer, and returns the number +//! successfully written or -1 on error. The default implementation returns -1. +int ByteStream::tryWrite() +{ + return -1; +} + +//! +//! Append array \a b to the end of the array pointed to by \a a. +void ByteStream::appendArray(QByteArray *a, const QByteArray &b) +{ + int oldsize = a->size(); + a->resize(oldsize + b.size()); + memcpy(a->data() + oldsize, b.data(), b.size()); +} + +//! +//! Returns \a size bytes from the start of the array pointed to by \a from. +//! If \a size is 0, then all available data will be returned. +//! If \a del is TRUE, then the bytes are also removed. +QByteArray ByteStream::takeArray(QByteArray *from, int size, bool del) +{ + QByteArray a; + if(size == 0) { + a = from->copy(); + if(del) + from->resize(0); + } + else { + if(size > (int)from->size()) + size = from->size(); + a.resize(size); + char *r = from->data(); + memcpy(a.data(), r, size); + if(del) { + int newsize = from->size()-size; + memmove(r, r+size, newsize); + from->resize(newsize); + } + } + return a; +} + void connectionClosed(); + void delayedCloseFinished(); + void readyRead(); + void bytesWritten(int); + void error(int); + +//! \fn void ByteStream::connectionClosed() +//! This signal is emitted when the remote end of the stream closes. + +//! \fn void ByteStream::delayedCloseFinished() +//! This signal is emitted when all pending data has been written to the stream +//! after an attempt to close. + +//! \fn void ByteStream::readyRead() +//! This signal is emitted when data is available to be read. + +//! \fn void ByteStream::bytesWritten(int x); +//! This signal is emitted when data has been successfully written to the stream. +//! \a x is the number of bytes written. + +//! \fn void ByteStream::error(int code) +//! This signal is emitted when an error occurs in the stream. The reason for +//! error is indicated by \a code. + +// CS_NAMESPACE_END + +#include "bytestream.moc" |