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#include "stream.h"
#include "stream_i.h"
#include "file_stream.h"
typedef struct {
Stream stream_base;
Storage* storage;
File* file;
} FileStream;
static void file_stream_free(FileStream* stream);
static bool file_stream_eof(FileStream* stream);
static void file_stream_clean(FileStream* stream);
static bool file_stream_seek(FileStream* stream, int32_t offset, StreamOffset offset_type);
static size_t file_stream_tell(FileStream* stream);
static size_t file_stream_size(FileStream* stream);
static size_t file_stream_write(FileStream* stream, const uint8_t* data, size_t size);
static size_t file_stream_read(FileStream* stream, uint8_t* data, size_t size);
static bool file_stream_delete_and_insert(
FileStream* stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx);
const StreamVTable file_stream_vtable = {
.free = (StreamFreeFn)file_stream_free,
.eof = (StreamEOFFn)file_stream_eof,
.clean = (StreamCleanFn)file_stream_clean,
.seek = (StreamSeekFn)file_stream_seek,
.tell = (StreamTellFn)file_stream_tell,
.size = (StreamSizeFn)file_stream_size,
.write = (StreamWriteFn)file_stream_write,
.read = (StreamReadFn)file_stream_read,
.delete_and_insert = (StreamDeleteAndInsertFn)file_stream_delete_and_insert,
};
Stream* file_stream_alloc(Storage* storage) {
FileStream* stream = malloc(sizeof(FileStream));
stream->file = storage_file_alloc(storage);
stream->storage = storage;
stream->stream_base.vtable = &file_stream_vtable;
return (Stream*)stream;
}
bool file_stream_open(
Stream* _stream,
const char* path,
FS_AccessMode access_mode,
FS_OpenMode open_mode) {
furi_assert(_stream);
FileStream* stream = (FileStream*)_stream;
furi_check(stream->stream_base.vtable == &file_stream_vtable);
return storage_file_open(stream->file, path, access_mode, open_mode);
}
bool file_stream_close(Stream* _stream) {
furi_assert(_stream);
FileStream* stream = (FileStream*)_stream;
furi_check(stream->stream_base.vtable == &file_stream_vtable);
return storage_file_close(stream->file);
}
static void file_stream_free(FileStream* stream) {
storage_file_free(stream->file);
free(stream);
}
static bool file_stream_eof(FileStream* stream) {
return storage_file_eof(stream->file);
}
static void file_stream_clean(FileStream* stream) {
storage_file_seek(stream->file, 0, true);
storage_file_truncate(stream->file);
}
static bool file_stream_seek(FileStream* stream, int32_t offset, StreamOffset offset_type) {
bool result = false;
size_t seek_position = 0;
size_t current_position = file_stream_tell(stream);
size_t size = file_stream_size(stream);
// calc offset and limit to bottom
switch(offset_type) {
case StreamOffsetFromCurrent: {
if((int32_t)(current_position + offset) >= 0) {
seek_position = current_position + offset;
result = true;
}
} break;
case StreamOffsetFromStart: {
if(offset >= 0) {
seek_position = offset;
result = true;
}
} break;
case StreamOffsetFromEnd: {
if((int32_t)(size + offset) >= 0) {
seek_position = size + offset;
result = true;
}
} break;
}
if(result) {
// limit to top
if((int32_t)(seek_position - size) > 0) {
storage_file_seek(stream->file, size, true);
result = false;
} else {
result = storage_file_seek(stream->file, seek_position, true);
}
} else {
storage_file_seek(stream->file, 0, true);
}
return result;
}
static size_t file_stream_tell(FileStream* stream) {
return storage_file_tell(stream->file);
}
static size_t file_stream_size(FileStream* stream) {
return storage_file_size(stream->file);
}
static size_t file_stream_write(FileStream* stream, const uint8_t* data, size_t size) {
// TODO cache
size_t need_to_write = size;
while(need_to_write > 0) {
uint16_t was_written =
storage_file_write(stream->file, data + (size - need_to_write), need_to_write);
need_to_write -= was_written;
if(was_written == 0) break;
}
return size - need_to_write;
}
static size_t file_stream_read(FileStream* stream, uint8_t* data, size_t size) {
// TODO cache
size_t need_to_read = size;
while(need_to_read > 0) {
uint16_t was_read =
storage_file_read(stream->file, data + (size - need_to_read), need_to_read);
need_to_read -= was_read;
if(was_read == 0) break;
}
return size - need_to_read;
}
static bool file_stream_delete_and_insert(
FileStream* _stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx) {
bool result = false;
Stream* stream = (Stream*)_stream;
// open scratchpad
Stream* scratch_stream = file_stream_alloc(_stream->storage);
// TODO: we need something like "storage_open_tmpfile and storage_close_tmpfile"
string_t scratch_name;
string_t tmp_name;
string_init(tmp_name);
storage_get_next_filename(_stream->storage, "/any", ".scratch", ".pad", tmp_name);
string_init_printf(scratch_name, "/any/%s.pad", string_get_cstr(tmp_name));
string_clear(tmp_name);
do {
if(!file_stream_open(
scratch_stream, string_get_cstr(scratch_name), FSAM_READ_WRITE, FSOM_CREATE_NEW))
break;
size_t current_position = stream_tell(stream);
size_t file_size = stream_size(stream);
size_t size_to_delete = file_size - current_position;
size_to_delete = MIN(delete_size, size_to_delete);
size_t size_to_copy_before = current_position;
size_t size_to_copy_after = file_size - current_position - size_to_delete;
// copy file from 0 to insert position to scratchpad
if(!stream_rewind(stream)) break;
if(stream_copy(stream, scratch_stream, size_to_copy_before) != size_to_copy_before) break;
if(write_callback) {
if(!write_callback(scratch_stream, ctx)) break;
}
size_t new_position = stream_tell(scratch_stream);
// copy key file after insert position + size_to_delete to scratchpad
if(!stream_seek(stream, size_to_delete, StreamOffsetFromCurrent)) break;
if(stream_copy(stream, scratch_stream, size_to_copy_after) != size_to_copy_after) break;
size_t new_file_size = stream_size(scratch_stream);
// copy whole scratchpad file to the original file
if(!stream_rewind(stream)) break;
if(!stream_rewind(scratch_stream)) break;
if(stream_copy(scratch_stream, stream, new_file_size) != new_file_size) break;
// and truncate original file
if(!storage_file_truncate(_stream->file)) break;
// move seek pointer at insert end
if(!stream_seek(stream, new_position, StreamOffsetFromStart)) break;
result = true;
} while(false);
stream_free(scratch_stream);
storage_common_remove(_stream->storage, string_get_cstr(scratch_name));
string_clear(scratch_name);
return result;
}
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