135fbd294b
* Add write methods for stream cache * Fix logical error * Implement write cache for buffered file streams * Minor code refactoring * Less ugly code * Better read() implementation * Intermediate implementation * Fix logical error * Code cleanup * Update FFF comments * Fix logical error * Github: rsync with delete Co-authored-by: あく <alleteam@gmail.com>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
#pragma once
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#include "stream.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct StreamCache StreamCache;
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/**
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* Allocate stream cache.
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* @return StreamCache* pointer to a StreamCache instance
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*/
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StreamCache* stream_cache_alloc();
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/**
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* Free stream cache.
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* @param cache Pointer to a StreamCache instance
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*/
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void stream_cache_free(StreamCache* cache);
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/**
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* Drop the cache contents and set it to initial state.
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* @param cache Pointer to a StreamCache instance
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*/
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void stream_cache_drop(StreamCache* cache);
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/**
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* Determine if the internal cursor is at end the end of cached data.
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* @param cache Pointer to a StreamCache instance
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* @return True if cursor is at end, otherwise false.
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*/
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bool stream_cache_at_end(StreamCache* cache);
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/**
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* Get the current size of cached data.
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* @param cache Pointer to a StreamCache instance
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* @return Size of cached data.
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*/
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size_t stream_cache_size(StreamCache* cache);
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/**
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* Get the internal cursor position.
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* @param cache Pointer to a StreamCache instance
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* @return Cursor position inside the cache.
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*/
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size_t stream_cache_pos(StreamCache* cache);
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/**
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* Load the cache with new data from a stream.
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* @param cache Pointer to a StreamCache instance
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* @param stream Pointer to a Stream instance
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* @return Size of newly cached data.
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*/
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size_t stream_cache_fill(StreamCache* cache, Stream* stream);
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/**
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* Write as much cached data as possible to a stream.
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* @param cache Pointer to a StreamCache instance
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* @param stream Pointer to a Stream instance
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* @return True on success, False on failure.
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*/
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bool stream_cache_flush(StreamCache* cache, Stream* stream);
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/**
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* Read cached data and advance the internal cursor.
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* @param cache Pointer to a StreamCache instance.
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* @param data Pointer to a data buffer. Must be initialized.
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* @param size Maximum size in bytes to read from the cache.
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* @return Actual size that was read.
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*/
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size_t stream_cache_read(StreamCache* cache, uint8_t* data, size_t size);
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/**
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* Write to cached data and advance the internal cursor.
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* @param cache Pointer to a StreamCache instance.
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* @param data Pointer to a data buffer.
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* @param size Maximum size in bytes to write to the cache.
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* @return Actual size that was written.
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*/
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size_t stream_cache_write(StreamCache* cache, const uint8_t* data, size_t size);
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/**
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* Move the internal cursor relatively to its current position.
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* @param cache Pointer to a StreamCache instance.
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* @param offset Cursor offset.
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* @return Actual cursor offset. Equal to offset parameter on hit.
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*/
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int32_t stream_cache_seek(StreamCache* cache, int32_t offset);
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#ifdef __cplusplus
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}
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#endif
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