mirror of https://github.com/libAthena/athena.git
254 lines
8.7 KiB
C++
254 lines
8.7 KiB
C++
// This file is part of libZelda.
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//
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// libZelda is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// libZelda 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with libZelda. If not, see <http://www.gnu.org/licenses/>
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#ifndef __STREAM_HPP__
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#define __STREAM_HPP__
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#include "Types.hpp"
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namespace zelda
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{
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namespace io
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{
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/*! \class Stream
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* \brief Stream is the main class all streams inherit from
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*
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* The Stream class contains the memory buffer, buffer size, and current position.<br />
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* It provides basic functionality such as reading or writing bits and bytes
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* The user has the ability to specify the Endianness of the Stream as well
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* And all inheriting classes are required to take that into account to be accepted
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* as a valid stream. <br />
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* <br />
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* Stream can also be used by itself though it's not advised as it's not feature filled.<br />
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* It's highly suggested to use of the more advanced Streams such as BinaryReader.
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*/
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class Stream
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{
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public:
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//! \brief Default buffer block size.
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static const Uint32 BLOCKSZ;
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/*! \enum SeekOrigin
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* \brief Specifies how to seek in a stream.
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*/
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enum SeekOrigin
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{
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Beginning = 0, //!< Tells the Stream to seek from the Beginning of the buffer.
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Current, //!< Tells the Stream to seek from the Current position of the buffer.
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End //!< Tells the Stream to seek from the End of the buffer.
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};
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/*! \brief The default constructor
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*/
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Stream();
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/*! \brief This constructor takes an existing buffer to read from.
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*
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* \param bytes The existing buffer
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* \param length The length of the existing buffer
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*/
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Stream(const Uint8* bytes, Uint64 length);
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/*! \brief This constructor creates a buffer from the given length.
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*
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* \param length The length of the existing buffer
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*/
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Stream(Int64 length);
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/*! \brief This constructor takes an existing Stream to read from.
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*
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* \param stream The stream to read data from
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*/
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Stream(Stream* stream);
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/*! \brief The destructor cleans up memory and sets everything back
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* to the default settings.
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*/
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virtual ~Stream();
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/*! \brief Writes a bit at the current position and advances the position by one bit.
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* \param val the value to write
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* \throw IOException
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*/
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virtual void writeBit(bool val);
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/*! \brief Writes a byte at the current position and advances the position by one byte.
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* \param byte The value to write
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* \throw IOException
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*/
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virtual void writeUByte(Uint8 byte);
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/*! \brief Writes a byte at the current position and advances the position by one byte.
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* \param byte The value to write
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* \throw IOException
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*/
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virtual void writeByte(Int8 byte);
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/*! \brief Writes the given buffer with the specified length, buffers can be bigger than the length
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* however it's undefined behavior to try and write a buffer which is smaller than the given length.
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*
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* \param data The buffer to write
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* \param length The amount to write
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* \throw IOException
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*/
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virtual void writeUBytes(Uint8* data, Int64 length);
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/*! \brief Writes the given buffer with the specified length, buffers can be bigger than the length
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* however it's undefined behavior to try and write a buffer which is smaller than the given length.
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*
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* \param data The buffer to write
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* \param length The amount to write
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* \throw IOException
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*/
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virtual void writeBytes(Int8* data, Int64 length);
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/*! \brief Reads a bit at the current position and advances the current position
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*
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* \return bool The value at the current position
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* \throw IOException
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*/
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virtual bool readBit();
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/*! \brief Reads a byte at the current position and advances the current position
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*
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* \return Int8 The value at the current position
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* \throw IOException
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*/
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virtual Int8 readByte();
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/*! \brief Reads a byte at the current position and advances the current position.
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*
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* \return Uint8* The buffer at the current position from the given length.
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* \throw IOException
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*/
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virtual Uint8* readUBytes(Int64 length);
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/*! \brief Reads a byte at the current position and advances the current position.
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*
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* \return Int8* The buffer at the current position from the given length.
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* \throw IOException
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*/
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virtual Int8* readBytes(Int64 length);
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/*! \brief Sets the buffers position relative to the specified position.<br />
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* It seeks relative to the current position by default.
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* \param position where in the buffer to seek
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* \param origin The Origin to seek \sa SeekOrigin
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* \throw IOException
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*/
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void seek(Int64 position, SeekOrigin origin = Current);
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/*! \brief Resizes the buffer to the given length.<br />
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* The new size must be greater than the current length to avoid loss of data.
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* \param newSize The amount to resize by.
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* \throw IOException
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*/
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void resize(Uint64 newSize);
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/*! \brief Sets the buffer to the given one, deleting the current one.<br />
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* <b>BEWARE:</b> As this deletes the current buffer it WILL cause a loss of data
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* if that was not the intent.<br />
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* Once you pass the data to setData <b>DO NOT</b> delete the buffer
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* as Stream now owns the address, this is done to keep memory usage down.
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* \param data The new buffer.
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* \param length The length of the new buffer.
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* \throw IOException
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*/
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void setData(const Uint8* data, Uint64 length);
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/*! \brief Returns a copy of the current buffer.<br />
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* Changes to the copy do not affect the buffer so it's perfectly safe to
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* directly edit the buffer and use setData to set the new information.<br />
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* However once you pass the data to setData <b>DO NOT</b> delete the buffer
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* as Stream now owns the address, this is done to keep memory usage down.
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* \return Uint8* The copy of the buffer.
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*/
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Uint8* data() const;
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/*! \brief Returns the length of the Stream.
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*
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* \return Int64 The length of the stream.
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*/
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Int64 length() const;
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/*! \brief Returns the current position in the stream.
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*
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* \return Int64 The current position in the stream.
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*/
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Int64 position() const;
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/*! \brief Returns whether or not the stream is at the end.
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*
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* \return bool True if at end; False otherwise.
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*/
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bool atEnd() const;
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/*! \brief Sets whether the Stream resizes when the at the end of the buffer.
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*
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* \param val True for resizing; False for no resizing.
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*/
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void setAutoResizing(bool val);
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/*! \brief Retuns whether or not the Stream currenty autoresizes.
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*
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* \return True for resizing; False otherwise.
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*/
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bool autoResizing() const;
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/*! \brief Retuns whether or not the Stream is open for reading.
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*
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* \return True if open for reading; False otherwise.
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*/
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virtual bool isOpenForReading() const;
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/*! \brief Retuns whether or not the Stream is open for writing
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*
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* \return True if open for writing; False otherwise.
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*/
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virtual bool isOpenForWriting() const;
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/*! \brief Sets the Endianss of the stream
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*
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* \param endian The Endianess to set \sa Endian
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*/
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void setEndianess(Endian endian);
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/*! \brief Returns the current Endianness of the stream
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*
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* \return Endian The current Stream Endianess
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*/
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Endian endian() const;
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/*! \brief Returns whether the stream is BigEndian
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*
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* \return bool True for BigEndian; False for LittleEndian
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*/
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bool isBigEndian() const;
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/*! \brief Returns whether the stream is LittleEndian
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*
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* \return bool True for LittleEndian; False for BigEndian
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*/
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bool isLittleEndian() const;
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protected:
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Uint32 m_bitPosition; //!< The current position in the current byte
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Uint64 m_position; //!< The current position in the Stream
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Uint64 m_length; //!< The length of the Stream
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Endian m_endian; //!< The Endianess of the Stream
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Uint8* m_data; //!< The Stream buffer
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bool m_autoResize; //!< Whether the stream is autoresizing
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};
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} // io
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} // zelda
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#endif // __STREAM_HPP__
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