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#include "stream.h"
#include "stream_i.h"
#include "string_stream.h"
#include <furi/common_defines.h>
typedef struct {
Stream stream_base;
string_t string;
size_t index;
} StringStream;
static size_t string_stream_write_char(StringStream* stream, char c);
static void string_stream_free(StringStream* stream);
static bool string_stream_eof(StringStream* stream);
static void string_stream_clean(StringStream* stream);
static bool string_stream_seek(StringStream* stream, int32_t offset, StreamOffset offset_type);
static size_t string_stream_tell(StringStream* stream);
static size_t string_stream_size(StringStream* stream);
static size_t string_stream_write(StringStream* stream, const char* data, size_t size);
static size_t string_stream_read(StringStream* stream, char* data, size_t size);
static bool string_stream_delete_and_insert(
StringStream* stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx);
const StreamVTable string_stream_vtable = {
.free = (StreamFreeFn)string_stream_free,
.eof = (StreamEOFFn)string_stream_eof,
.clean = (StreamCleanFn)string_stream_clean,
.seek = (StreamSeekFn)string_stream_seek,
.tell = (StreamTellFn)string_stream_tell,
.size = (StreamSizeFn)string_stream_size,
.write = (StreamWriteFn)string_stream_write,
.read = (StreamReadFn)string_stream_read,
.delete_and_insert = (StreamDeleteAndInsertFn)string_stream_delete_and_insert,
};
Stream* string_stream_alloc() {
StringStream* stream = malloc(sizeof(StringStream));
string_init(stream->string);
stream->index = 0;
stream->stream_base.vtable = &string_stream_vtable;
return (Stream*)stream;
}
static void string_stream_free(StringStream* stream) {
string_clear(stream->string);
free(stream);
}
static bool string_stream_eof(StringStream* stream) {
return (string_stream_tell(stream) >= string_stream_size(stream));
}
static void string_stream_clean(StringStream* stream) {
stream->index = 0;
string_reset(stream->string);
}
static bool string_stream_seek(StringStream* stream, int32_t offset, StreamOffset offset_type) {
bool result = true;
switch(offset_type) {
case StreamOffsetFromStart:
if(offset >= 0) {
stream->index = offset;
} else {
result = false;
stream->index = 0;
}
break;
case StreamOffsetFromCurrent:
if(((int32_t)stream->index + offset) >= 0) {
stream->index += offset;
} else {
result = false;
stream->index = 0;
}
break;
case StreamOffsetFromEnd:
if(((int32_t)string_size(stream->string) + offset) >= 0) {
stream->index = string_size(stream->string) + offset;
} else {
result = false;
stream->index = 0;
}
break;
}
int32_t diff = (stream->index - string_size(stream->string));
if(diff > 0) {
stream->index -= diff;
result = false;
}
return result;
}
static size_t string_stream_tell(StringStream* stream) {
return stream->index;
}
static size_t string_stream_size(StringStream* stream) {
return string_size(stream->string);
}
static size_t string_stream_write(StringStream* stream, const char* data, size_t size) {
// TODO: can be optimized for edge cases
size_t i;
for(i = 0; i < size; i++) {
string_stream_write_char(stream, data[i]);
}
return i;
}
static size_t string_stream_read(StringStream* stream, char* data, size_t size) {
size_t write_index = 0;
const char* cstr = string_get_cstr(stream->string);
if(!string_stream_eof(stream)) {
while(true) {
if(write_index >= size) break;
data[write_index] = cstr[stream->index];
write_index++;
string_stream_seek(stream, 1, StreamOffsetFromCurrent);
if(string_stream_eof(stream)) break;
}
}
return write_index;
}
static bool string_stream_delete_and_insert(
StringStream* stream,
size_t delete_size,
StreamWriteCB write_callback,
const void* ctx) {
bool result = true;
if(delete_size) {
size_t remain_size = string_stream_size(stream) - string_stream_tell(stream);
remain_size = MIN(delete_size, remain_size);
if(remain_size != 0) {
string_replace_at(stream->string, stream->index, remain_size, "");
}
}
if(write_callback) {
string_t right;
string_init_set(right, &string_get_cstr(stream->string)[stream->index]);
string_left(stream->string, string_stream_tell(stream));
result &= write_callback((Stream*)stream, ctx);
string_cat(stream->string, right);
string_clear(right);
}
return result;
}
/**
* Write to string stream helper
* @param stream
* @param c
* @return size_t
*/
static size_t string_stream_write_char(StringStream* stream, char c) {
if(string_stream_eof(stream)) {
string_push_back(stream->string, c);
} else {
string_set_char(stream->string, stream->index, c);
}
stream->index++;
return 1;
}
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