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#include "buffered_file_stream.h"
#include "stream_i.h"
#include "file_stream.h"
#include "stream_cache.h"
typedef struct {
Stream stream_base;
Stream* file_stream;
StreamCache* cache;
} BufferedFileStream;
static void buffered_file_stream_free(BufferedFileStream* stream);
static bool buffered_file_stream_eof(BufferedFileStream* stream);
static void buffered_file_stream_clean(BufferedFileStream* stream);
static bool
buffered_file_stream_seek(BufferedFileStream* stream, int32_t offset, StreamOffset offset_type);
static size_t buffered_file_stream_tell(BufferedFileStream* stream);
static size_t buffered_file_stream_size(BufferedFileStream* stream);
static size_t
buffered_file_stream_write(BufferedFileStream* stream, const uint8_t* data, size_t size);
static size_t buffered_file_stream_read(BufferedFileStream* stream, uint8_t* data, size_t size);
static bool buffered_file_stream_delete_and_insert(
BufferedFileStream* stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx);
const StreamVTable buffered_file_stream_vtable = {
.free = (StreamFreeFn)buffered_file_stream_free,
.eof = (StreamEOFFn)buffered_file_stream_eof,
.clean = (StreamCleanFn)buffered_file_stream_clean,
.seek = (StreamSeekFn)buffered_file_stream_seek,
.tell = (StreamTellFn)buffered_file_stream_tell,
.size = (StreamSizeFn)buffered_file_stream_size,
.write = (StreamWriteFn)buffered_file_stream_write,
.read = (StreamReadFn)buffered_file_stream_read,
.delete_and_insert = (StreamDeleteAndInsertFn)buffered_file_stream_delete_and_insert,
};
Stream* buffered_file_stream_alloc(Storage* storage) {
BufferedFileStream* stream = malloc(sizeof(BufferedFileStream));
stream->file_stream = file_stream_alloc(storage);
stream->cache = stream_cache_alloc();
stream->stream_base.vtable = &buffered_file_stream_vtable;
return (Stream*)stream;
}
bool buffered_file_stream_open(
Stream* _stream,
const char* path,
FS_AccessMode access_mode,
FS_OpenMode open_mode) {
furi_assert(_stream);
BufferedFileStream* stream = (BufferedFileStream*)_stream;
stream_cache_drop(stream->cache);
furi_check(stream->stream_base.vtable == &buffered_file_stream_vtable);
return file_stream_open(stream->file_stream, path, access_mode, open_mode);
}
bool buffered_file_stream_close(Stream* _stream) {
furi_assert(_stream);
BufferedFileStream* stream = (BufferedFileStream*)_stream;
furi_check(stream->stream_base.vtable == &buffered_file_stream_vtable);
return file_stream_close(stream->file_stream);
}
FS_Error buffered_file_stream_get_error(Stream* _stream) {
furi_assert(_stream);
BufferedFileStream* stream = (BufferedFileStream*)_stream;
furi_check(stream->stream_base.vtable == &buffered_file_stream_vtable);
return file_stream_get_error(stream->file_stream);
}
static void buffered_file_stream_free(BufferedFileStream* stream) {
furi_assert(stream);
stream_free(stream->file_stream);
stream_cache_free(stream->cache);
free(stream);
}
static bool buffered_file_stream_eof(BufferedFileStream* stream) {
return stream_cache_at_end(stream->cache) && stream_eof(stream->file_stream);
}
static void buffered_file_stream_clean(BufferedFileStream* stream) {
stream_cache_drop(stream->cache);
stream_clean(stream->file_stream);
}
static bool buffered_file_stream_seek(
BufferedFileStream* stream,
int32_t offset,
StreamOffset offset_type) {
bool success = false;
int32_t new_offset = offset;
if(offset_type == StreamOffsetFromCurrent) {
new_offset -= stream_cache_seek(stream->cache, offset);
if(new_offset < 0) {
new_offset -= (int32_t)stream_cache_size(stream->cache);
}
}
if((new_offset != 0) || (offset_type != StreamOffsetFromCurrent)) {
stream_cache_drop(stream->cache);
success = stream_seek(stream->file_stream, new_offset, offset_type);
} else {
success = true;
}
return success;
}
static size_t buffered_file_stream_tell(BufferedFileStream* stream) {
return stream_tell(stream->file_stream) + stream_cache_pos(stream->cache) -
stream_cache_size(stream->cache);
}
static size_t buffered_file_stream_size(BufferedFileStream* stream) {
return stream_cache_size(stream->cache) + stream_size(stream->file_stream);
}
static size_t
buffered_file_stream_write(BufferedFileStream* stream, const uint8_t* data, size_t size) {
stream_cache_drop(stream->cache);
return stream_write(stream->file_stream, data, size);
}
static size_t buffered_file_stream_read(BufferedFileStream* stream, uint8_t* data, size_t size) {
size_t need_to_read = size;
while(need_to_read) {
need_to_read -=
stream_cache_read(stream->cache, data + (size - need_to_read), need_to_read);
if(need_to_read) {
if(!stream_cache_fill(stream->cache, stream->file_stream)) {
break;
}
}
}
return size - need_to_read;
}
static bool buffered_file_stream_delete_and_insert(
BufferedFileStream* stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx) {
stream_cache_drop(stream->cache);
return stream_delete_and_insert(stream->file_stream, delete_size, write_callback, ctx);
}
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