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82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
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* CFileInputStream.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "CInputStream.h"
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#include "FileStream.h"
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VCMI_LIB_NAMESPACE_BEGIN
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/**
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* A class which provides method definitions for reading a file from the filesystem.
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*/
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class DLL_LINKAGE CFileInputStream : public CInputStream
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{
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public:
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/**
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* C-tor. Opens the specified file.
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*
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* @param file Path to the file.
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* @param start - offset from file start where real data starts (e.g file on archive)
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* @param size - size of real data in file (e.g file on archive) or 0 to use whole file
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*
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* @throws std::runtime_error if file wasn't found
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*/
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CFileInputStream(const boost::filesystem::path & file, si64 start = 0, si64 size = 0);
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/**
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* Reads n bytes from the stream into the data buffer.
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*
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* @param data A pointer to the destination data array.
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* @param size The number of bytes to read.
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* @return the number of bytes read actually.
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*/
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si64 read(ui8 * data, si64 size) override;
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/**
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* Seeks the internal read pointer to the specified position.
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*
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* @param position The read position from the beginning.
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* @return the position actually moved to, -1 on error.
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*/
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si64 seek(si64 position) override;
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/**
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* Gets the current read position in the stream.
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*
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* @return the read position. -1 on failure or if the read pointer isn't in the valid range.
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*/
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si64 tell() override;
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/**
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* Skips delta numbers of bytes.
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*
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* @param delta The count of bytes to skip.
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* @return the count of bytes skipped actually.
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*/
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si64 skip(si64 delta) override;
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/**
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* Gets the length in bytes of the stream.
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*
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* @return the length in bytes of the stream.
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*/
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si64 getSize() override;
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private:
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si64 dataStart;
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si64 dataSize;
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/** Native c++ input file stream object. */
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FileStream fileStream;
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};
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VCMI_LIB_NAMESPACE_END
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