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[FL-2713] Buffered file streams fix (#1515)

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* Fix incorrect buffered stream behaviour
* Add specific tests
* Make the test fail on wrong behaviour
* Better names

Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Georgii Surkov 2022-08-02 16:17:37 +03:00 committed by GitHub
parent f9745b4141
commit 01afb289c0
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 53 additions and 4 deletions
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29
applications/unit_tests/stream/stream_test.c
View file

@ -387,6 +387,34 @@ MU_TEST(stream_split_test) {
furi_record_close(RECORD_STORAGE);
}
MU_TEST(stream_buffered_write_after_read_test) {
const char* prefix = "I write ";
const char* substr = "Hello there";
const size_t substr_len = strlen(substr);
const size_t prefix_len = strlen(prefix);
const size_t buf_size = substr_len + 1;
char buf[buf_size];
memset(buf, 0, buf_size);
Storage* storage = furi_record_open(RECORD_STORAGE);
Stream* stream = buffered_file_stream_alloc(storage);
mu_check(buffered_file_stream_open(
stream, EXT_PATH("filestream.str"), FSAM_READ_WRITE, FSOM_CREATE_ALWAYS));
mu_assert_int_eq(strlen(stream_test_data), stream_write_cstring(stream, stream_test_data));
mu_check(stream_rewind(stream));
mu_assert_int_eq(prefix_len, stream_read(stream, (uint8_t*)buf, prefix_len));
mu_assert_string_eq(prefix, buf);
mu_assert_int_eq(substr_len, stream_write(stream, (uint8_t*)substr, substr_len));
mu_check(stream_seek(stream, prefix_len, StreamOffsetFromStart));
mu_assert_int_eq(substr_len, stream_read(stream, (uint8_t*)buf, substr_len));
mu_assert_string_eq(substr, buf);
stream_free(stream);
furi_record_close(RECORD_STORAGE);
}
MU_TEST(stream_buffered_large_file_test) {
string_t input_data;
string_t output_data;
@ -470,6 +498,7 @@ MU_TEST_SUITE(stream_suite) {
MU_RUN_TEST(stream_write_read_save_load_test);
MU_RUN_TEST(stream_composite_test);
MU_RUN_TEST(stream_split_test);
MU_RUN_TEST(stream_buffered_write_after_read_test);
MU_RUN_TEST(stream_buffered_large_file_test);
}

28
lib/toolbox/stream/buffered_file_stream.c
View file

@ -1,5 +1,6 @@
#include "buffered_file_stream.h"
#include "core/check.h"
#include "stream_i.h"
#include "file_stream.h"
#include "stream_cache.h"
@ -38,6 +39,8 @@ const StreamVTable buffered_file_stream_vtable = {
.delete_and_insert = (StreamDeleteAndInsertFn)buffered_file_stream_delete_and_insert,
};
static bool buffered_file_stream_unread(BufferedFileStream* stream);
Stream* buffered_file_stream_alloc(Storage* storage) {
BufferedFileStream* stream = malloc(sizeof(BufferedFileStream));
@ -125,8 +128,12 @@ 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) {
stream_cache_drop(stream->cache);
return stream_write(stream->file_stream, data, size);
size_t need_to_write = size;
do {
if(!buffered_file_stream_unread(stream)) break;
need_to_write -= stream_write(stream->file_stream, data, size);
} while(false);
return size - need_to_write;
}
static size_t buffered_file_stream_read(BufferedFileStream* stream, uint8_t* data, size_t size) {
@ -150,6 +157,19 @@ static bool buffered_file_stream_delete_and_insert(
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);
return buffered_file_stream_unread(stream) &&
stream_delete_and_insert(stream->file_stream, delete_size, write_callback, ctx);
}
// Drop read cache and adjust the underlying stream seek position
static bool buffered_file_stream_unread(BufferedFileStream* stream) {
bool success = true;
const size_t cache_size = stream_cache_size(stream->cache);
const size_t cache_pos = stream_cache_pos(stream->cache);
if(cache_pos < cache_size) {
const int32_t offset = cache_size - cache_pos;
success = stream_seek(stream->file_stream, -offset, StreamOffsetFromCurrent);
}
stream_cache_drop(stream->cache);
return success;
}