mirror of https://github.com/libAthena/athena.git
132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
#ifndef MEMORYREADER_HPP
|
|
#define MEMORYREADER_HPP
|
|
|
|
#include <string>
|
|
#include <memory>
|
|
#include <functional>
|
|
#include "Athena/IStreamReader.hpp"
|
|
|
|
namespace Athena
|
|
{
|
|
namespace io
|
|
{
|
|
/*! \class MemoryReader
|
|
* \brief A Stream class for reading data from a memory position
|
|
*
|
|
* A Class for reading binary data from a file or memory stream,
|
|
* all work is done using a memory buffer, and not read directly from the disk
|
|
* this allows for fast, flexible code as well as the ability to quickly modify data
|
|
* \sa Stream
|
|
*/
|
|
class MemoryReader : public IStreamReader
|
|
{
|
|
public:
|
|
/*! \brief This constructor references an existing buffer to read from.
|
|
*
|
|
* \param data The existing buffer
|
|
* \param length The length of the existing buffer
|
|
*/
|
|
MemoryReader(const atUint8* data, atUint64 length);
|
|
|
|
/*! \brief Sets the buffers position relative to the specified position.<br />
|
|
* It seeks relative to the current position by default.
|
|
* \param position where in the buffer to seek
|
|
* \param origin The Origin to seek \sa SeekOrigin
|
|
*/
|
|
void seek(atInt64 pos, SeekOrigin origin = SeekOrigin::Current);
|
|
|
|
/*! \brief Returns the current position in the stream.
|
|
*
|
|
* \return Int64 The current position in the stream.
|
|
*/
|
|
inline atUint64 position() const
|
|
{return m_position;}
|
|
|
|
/*! \brief Returns whether or not the stream is at the end.
|
|
*
|
|
* \return bool True if at end; False otherwise.
|
|
*/
|
|
inline atUint64 length() const
|
|
{return m_length;}
|
|
|
|
|
|
/*! \brief Sets the buffer to the given one, deleting the current one.<br />
|
|
* <b>BEWARE:</b> As this deletes the current buffer it WILL cause a loss of data
|
|
* if that was not the intent.<br />
|
|
* Once you pass the data to setData <b>DO NOT</b> delete the buffer
|
|
* as Stream now owns the address, this is done to keep memory usage down.
|
|
* \param data The new buffer.
|
|
* \param length The length of the new buffer.
|
|
* \throw IOException
|
|
*/
|
|
void setData(const atUint8* data, atUint64 length);
|
|
|
|
|
|
/*! \brief Returns a copy of the current buffer.<br />
|
|
* Changes to the copy do not affect the buffer so it's perfectly safe to
|
|
* directly edit the buffer and use setData to set the new information.<br />
|
|
* However once you pass the data to setData <b>DO NOT</b> delete the buffer
|
|
* as Stream now owns the address, this is done to keep memory usage down.
|
|
* \return Uint8* The copy of the buffer.
|
|
*/
|
|
atUint8* data() const;
|
|
|
|
/*! \brief Reads a specified number of bytes to user-allocated buffer
|
|
* \param buf User-allocated buffer pointer
|
|
* \param len Length to read
|
|
* \return Number of bytes read
|
|
*/
|
|
atUint64 readUBytesToBuf(void* buf, atUint64 len);
|
|
|
|
protected:
|
|
const atUint8* m_data;
|
|
atUint64 m_length;
|
|
atUint64 m_position;
|
|
};
|
|
|
|
class MemoryCopyReader : public MemoryReader
|
|
{
|
|
public:
|
|
/*! \brief This constructor copies an existing buffer to read from.
|
|
*
|
|
* \param data The existing buffer
|
|
* \param length The length of the existing buffer
|
|
*/
|
|
MemoryCopyReader(const atUint8* data, atUint64 length);
|
|
|
|
/*! \brief This constructor creates an instance from a file on disk.
|
|
*
|
|
* \param filename The file to create the stream from
|
|
*/
|
|
MemoryCopyReader(const std::string& filename)
|
|
: MemoryReader(NULL, 0),
|
|
m_filepath(filename)
|
|
{loadData();}
|
|
|
|
void setData(const atUint8* data, atUint64 length);
|
|
|
|
protected:
|
|
void loadData();
|
|
std::unique_ptr<atUint8[]> m_dataCopy;
|
|
std::string m_filepath; //!< Path to the target file
|
|
};
|
|
|
|
} // io
|
|
} // Athena
|
|
|
|
#ifndef MEMORYREADER_BASE
|
|
#define MEMORYREADER_BASE() \
|
|
private: \
|
|
typedef Athena::io::MemoryReader base
|
|
|
|
#endif // MEMORYREADER_BASE
|
|
|
|
#ifndef MEMORYCOPYREADER_BASE
|
|
#define MEMORYCOPYREADER_BASE() \
|
|
private: \
|
|
typedef Athena::io::MemoryCopyReader base
|
|
|
|
#endif // MEMORYCOPYREADER_BASE
|
|
|
|
#endif // MEMORYREADER_HPP
|