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145 lines
3.5 KiB
C++
145 lines
3.5 KiB
C++
#ifndef __MDFN_STREAM_H
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#define __MDFN_STREAM_H
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// TODO/WIP
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// TODO?: BufferedStream, no virtual functions, yes inline functions, constructor takes a Stream* argument.
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#include "mednafen.h"
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#define MODE_READ 0
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#define MODE_WRITE 1
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#define MODE_WRITE_SAFE 2
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#define MODE_WRITE_INPLACE 3
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class Stream
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{
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public:
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Stream();
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virtual ~Stream();
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virtual uint64_t read(void *data, uint64_t count) = 0;
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virtual void write(const void *data, uint64_t count) = 0;
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virtual void seek(int64_t offset, int whence) = 0;
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virtual uint64_t tell(void) = 0;
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virtual uint64_t size(void) = 0;
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virtual void close(void) = 0; // Flushes(in the case of writeable streams) and closes the stream.
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// Necessary since this operation can fail(running out of disk space, for instance),
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// and throw an exception in the destructor would be a Bad Idea(TM).
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//
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// Manually calling this function isn't strictly necessary, but recommended when the
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// stream is writeable; it will be called automatically from the destructor, with any
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// exceptions thrown caught and logged.
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//
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// Utility functions(TODO):
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//
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INLINE uint8_t get_u8(void)
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{
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uint8_t ret;
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read(&ret, sizeof(ret));
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return ret;
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}
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INLINE void put_u8(uint8_t c)
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{
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write(&c, sizeof(c));
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}
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template<typename T>
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INLINE T get_NE(void)
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{
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T ret;
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read(&ret, sizeof(ret));
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return ret;
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}
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template<typename T>
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INLINE void put_NE(T c)
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{
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write(&c, sizeof(c));
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}
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template<typename T>
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INLINE T get_RE(void)
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{
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uint8_t tmp[sizeof(T)];
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T ret = 0;
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read(tmp, sizeof(tmp));
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for(unsigned i = 0; i < sizeof(T); i++)
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ret |= (T)tmp[i] << (i * 8);
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return ret;
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}
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template<typename T>
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INLINE void put_RE(T c)
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{
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uint8_t tmp[sizeof(T)];
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for(unsigned i = 0; i < sizeof(T); i++)
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tmp[i] = ((uint8_t *)&c)[sizeof(T) - 1 - i];
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write(tmp, sizeof(tmp));
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}
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template<typename T>
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INLINE T get_LE(void)
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{
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#ifdef MSB_FIRST
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return get_RE<T>();
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#else
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return get_NE<T>();
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#endif
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}
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template<typename T>
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INLINE void put_LE(T c)
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{
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#ifdef MSB_FIRST
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return put_RE<T>(c);
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#else
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return put_NE<T>(c);
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#endif
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}
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template<typename T>
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INLINE T get_BE(void)
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{
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#ifdef MSB_FIRST
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return get_NE<T>();
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#else
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return get_RE<T>();
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#endif
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}
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template<typename T>
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INLINE void put_BE(T c)
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{
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#ifdef MSB_FIRST
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return put_NE<T>(c);
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#else
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return put_RE<T>(c);
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#endif
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}
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// Reads a line into "str", overwriting its contents; returns the line-end char('\n' or '\r' or '\0'), or -1 on EOF.
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// The line-end char won't be added to "str".
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// It's up to the caller to handle extraneous empty lines caused by DOS-format text lines(\r\n).
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// ("str" is passed by reference for the possibility of improved performance by reusing alloced memory for the std::string, though part
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// of it would be up to the STL implementation).
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// Implemented as virtual so that a higher-performance version can be implemented if possible(IE with MemoryStream)
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virtual int get_line(std::string &str);
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};
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#endif
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