mirror of
https://github.com/vcmi/vcmi.git
synced 2024-12-28 23:06:24 +02:00
100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
|
|
/*
|
|
* CFileInputStream.h, part of VCMI engine
|
|
*
|
|
* Authors: listed in file AUTHORS in main folder
|
|
*
|
|
* License: GNU General Public License v2.0 or later
|
|
* Full text of license available in license.txt file, in main folder
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "CInputStream.h"
|
|
|
|
class CFileInfo;
|
|
|
|
/**
|
|
* A class which provides method definitions for reading a file from the filesystem.
|
|
*/
|
|
class DLL_LINKAGE CFileInputStream : public CInputStream
|
|
{
|
|
public:
|
|
/**
|
|
* C-tor. Opens the specified file.
|
|
*
|
|
* @see CFileInputStream::open
|
|
*/
|
|
CFileInputStream(const std::string & file, si64 start=0, si64 size=0);
|
|
|
|
/**
|
|
* C-tor. Opens the specified file.
|
|
*
|
|
* @see CFileInputStream::open
|
|
*/
|
|
CFileInputStream(const CFileInfo & file, si64 start=0, si64 size=0);
|
|
|
|
/**
|
|
* D-tor. Calls the close method implicitely, if the file is still opened.
|
|
*/
|
|
~CFileInputStream();
|
|
|
|
/**
|
|
* Reads n bytes from the stream into the data buffer.
|
|
*
|
|
* @param data A pointer to the destination data array.
|
|
* @param size The number of bytes to read.
|
|
* @return the number of bytes read actually.
|
|
*/
|
|
si64 read(ui8 * data, si64 size);
|
|
|
|
/**
|
|
* Seeks the internal read pointer to the specified position.
|
|
*
|
|
* @param position The read position from the beginning.
|
|
* @return the position actually moved to, -1 on error.
|
|
*/
|
|
si64 seek(si64 position);
|
|
|
|
/**
|
|
* Gets the current read position in the stream.
|
|
*
|
|
* @return the read position. -1 on failure or if the read pointer isn't in the valid range.
|
|
*/
|
|
si64 tell();
|
|
|
|
/**
|
|
* Skips delta numbers of bytes.
|
|
*
|
|
* @param delta The count of bytes to skip.
|
|
* @return the count of bytes skipped actually.
|
|
*/
|
|
si64 skip(si64 delta);
|
|
|
|
/**
|
|
* Gets the length in bytes of the stream.
|
|
*
|
|
* @return the length in bytes of the stream.
|
|
*/
|
|
si64 getSize();
|
|
|
|
private:
|
|
/**
|
|
* Opens a file. If a file is currently opened, it will be closed.
|
|
*
|
|
* @param file Path to the file.
|
|
* @param start - offset from file start where real data starts (e.g file on archive)
|
|
* @param size - size of real data in file (e.g file on archive) or 0 to use whole file
|
|
*
|
|
* @throws std::runtime_error if file wasn't found
|
|
*/
|
|
void open(const std::string & file, si64 start, si64 size);
|
|
|
|
si64 dataStart;
|
|
si64 dataSize;
|
|
|
|
/** Native c++ input file stream object. */
|
|
std::ifstream fileStream;
|
|
};
|