131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
#pragma once
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#include "StarByteArray.hpp"
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#include "StarString.hpp"
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namespace Star {
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STAR_CLASS(IODevice);
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STAR_EXCEPTION(EofException, IOException);
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enum class IOMode : uint8_t {
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Closed = 0x0,
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Read = 0x1,
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Write = 0x2,
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ReadWrite = 0x3,
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Append = 0x4,
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Truncate = 0x8,
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};
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IOMode operator|(IOMode a, IOMode b);
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bool operator&(IOMode a, IOMode b);
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// Should match SEEK_SET, SEEK_CUR, AND SEEK_END
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enum IOSeek : uint8_t {
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Absolute = 0,
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Relative = 1,
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End = 2
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};
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// Abstract Interface to a random access I/O device.
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class IODevice {
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public:
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IODevice(IOMode mode = IOMode::Closed);
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virtual ~IODevice();
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// Do a read or write that may result in less data read or written than
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// requested.
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virtual size_t read(char* data, size_t len) = 0;
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virtual size_t write(char const* data, size_t len) = 0;
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virtual StreamOffset pos() = 0;
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virtual void seek(StreamOffset pos, IOSeek mode = IOSeek::Absolute) = 0;
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// Default implementation throws unsupported exception.
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virtual void resize(StreamOffset size);
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// Read / write from an absolute offset in the file without modifying the
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// current file position. Default implementation stores the file position,
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// then seeks and calls read/write partial, then restores the file position,
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// and is not thread safe.
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virtual size_t readAbsolute(StreamOffset readPosition, char* data, size_t len);
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virtual size_t writeAbsolute(StreamOffset writePosition, char const* data, size_t len);
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// Read and write fully, and throw an exception in every other case. The
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// default implementations here will call the normal read or write, and if
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// the full amount is not read will throw an exception.
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virtual void readFull(char* data, size_t len);
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virtual void writeFull(char const* data, size_t len);
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virtual void readFullAbsolute(StreamOffset readPosition, char* data, size_t len);
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virtual void writeFullAbsolute(StreamOffset writePosition, char const* data, size_t len);
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// Default implementation throws exception if opening in a different mode
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// than the current mode.
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virtual void open(IOMode mode);
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// Default implementation sets mode equal to Closed
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virtual void close();
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// Default implementation is a no-op
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virtual void sync();
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// Default implementation just prints address of generic IODevice
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virtual String deviceName() const;
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// Is the file position at the end of the file and there is no more to read?
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// This is not the same as feof, which returns true after an unsuccesful read
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// past the end, it should return true after succesfully reading the final
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// byte. Default implementation returns pos() >= size();
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virtual bool atEnd();
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// Default is to store position, seek end, then restore position.
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virtual StreamOffset size();
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IOMode mode() const;
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bool isOpen() const;
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bool isReadable() const;
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bool isWritable() const;
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ByteArray readBytes(size_t size);
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void writeBytes(ByteArray const& p);
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ByteArray readBytesAbsolute(StreamOffset readPosition, size_t size);
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void writeBytesAbsolute(StreamOffset writePosition, ByteArray const& p);
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protected:
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void setMode(IOMode mode);
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IODevice(IODevice const&);
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IODevice& operator=(IODevice const&);
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private:
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atomic<IOMode> m_mode;
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};
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inline IOMode operator|(IOMode a, IOMode b) {
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return (IOMode)((uint8_t)a | (uint8_t)b);
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}
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inline bool operator&(IOMode a, IOMode b) {
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return (uint8_t)a & (uint8_t)b;
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}
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inline IOMode IODevice::mode() const {
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return m_mode;
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}
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inline bool IODevice::isOpen() const {
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return m_mode != IOMode::Closed;
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}
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inline bool IODevice::isReadable() const {
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return m_mode & IOMode::Read;
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}
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inline bool IODevice::isWritable() const {
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return m_mode & IOMode::Write;
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}
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}
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