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>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
#include "stream_cache.h"
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#define STREAM_CACHE_MAX_SIZE 1024U
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struct StreamCache {
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uint8_t data[STREAM_CACHE_MAX_SIZE];
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size_t data_size;
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size_t position;
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};
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StreamCache* stream_cache_alloc() {
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StreamCache* cache = malloc(sizeof(StreamCache));
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cache->data_size = 0;
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cache->position = 0;
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return cache;
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}
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void stream_cache_free(StreamCache* cache) {
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furi_assert(cache);
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cache->data_size = 0;
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cache->position = 0;
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free(cache);
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}
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void stream_cache_drop(StreamCache* cache) {
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cache->data_size = 0;
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cache->position = 0;
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}
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bool stream_cache_at_end(StreamCache* cache) {
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furi_assert(cache->data_size >= cache->position);
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return cache->data_size == cache->position;
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}
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size_t stream_cache_size(StreamCache* cache) {
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return cache->data_size;
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}
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size_t stream_cache_pos(StreamCache* cache) {
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return cache->position;
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}
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size_t stream_cache_fill(StreamCache* cache, Stream* stream) {
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const size_t size_read = stream_read(stream, cache->data, STREAM_CACHE_MAX_SIZE);
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cache->data_size = size_read;
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cache->position = 0;
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return size_read;
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}
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bool stream_cache_flush(StreamCache* cache, Stream* stream) {
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const size_t size_written = stream_write(stream, cache->data, cache->data_size);
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const bool success = (size_written == cache->data_size);
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cache->data_size = 0;
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cache->position = 0;
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return success;
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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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furi_assert(cache->data_size >= cache->position);
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const size_t size_read = MIN(size, cache->data_size - cache->position);
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if(size_read > 0) {
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memcpy(data, cache->data + cache->position, size_read);
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cache->position += size_read;
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}
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return size_read;
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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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furi_assert(cache->data_size >= cache->position);
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const size_t size_written = MIN(size, STREAM_CACHE_MAX_SIZE - cache->position);
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if(size_written > 0) {
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memcpy(cache->data + cache->position, data, size_written);
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cache->position += size_written;
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if(cache->position > cache->data_size) {
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cache->data_size = cache->position;
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}
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}
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return size_written;
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}
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int32_t stream_cache_seek(StreamCache* cache, int32_t offset) {
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furi_assert(cache->data_size >= cache->position);
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int32_t actual_offset = 0;
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if(offset > 0) {
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actual_offset = MIN(cache->data_size - cache->position, (size_t)offset);
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} else if(offset < 0) {
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actual_offset = MAX(-((int32_t)cache->position), offset);
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}
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cache->position += actual_offset;
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return actual_offset;
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}
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