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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "records.hpp"
#include <stdint.h>
#include <sstream>
#include <vector>
#include "cbor.h"
#include "esp_log.h"
#include "song.hpp"
namespace database {
static const char* kTag = "RECORDS";
static const char kDataPrefix = 'D';
static const char kHashPrefix = 'H';
static const char kFieldSeparator = '\0';
/*
* Helper function for allocating an appropriately-sized byte buffer, then
* encoding data into it.
*
* 'T' should be a callable that takes a CborEncoder* as
* an argument, and stores values within that encoder. 'T' will be called
* exactly twice: first to detemine the buffer size, and then second to do the
* encoding.
*
* 'out_buf' will be set to the location of newly allocated memory; it is up to
* the caller to free it. Returns the size of 'out_buf'.
*/
template <typename T>
auto cbor_encode(uint8_t** out_buf, T fn) -> std::size_t {
// First pass: work out how many bytes we will encode into.
CborEncoder size_encoder;
cbor_encoder_init(&size_encoder, NULL, 0, 0);
std::invoke(fn, &size_encoder);
std::size_t buf_size = cbor_encoder_get_extra_bytes_needed(&size_encoder);
// Second pass: do the encoding.
CborEncoder encoder;
*out_buf = new uint8_t[buf_size];
cbor_encoder_init(&encoder, *out_buf, buf_size, 0);
std::invoke(fn, &encoder);
return buf_size;
}
OwningSlice::OwningSlice(std::string d) : data(d), slice(data) {}
auto CreateDataPrefix() -> OwningSlice {
char data[2] = {kDataPrefix, kFieldSeparator};
return OwningSlice({data, 2});
}
auto CreateDataKey(const SongId& id) -> OwningSlice {
std::ostringstream output;
output.put(kDataPrefix).put(kFieldSeparator);
output << SongIdToBytes(id).data;
return OwningSlice(output.str());
}
auto CreateDataValue(const SongData& song) -> OwningSlice {
uint8_t* buf;
std::size_t buf_len = cbor_encode(&buf, [&](CborEncoder* enc) {
CborEncoder array_encoder;
CborError err;
err = cbor_encoder_create_array(enc, &array_encoder, 5);
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encode_int(&array_encoder, song.id());
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encode_text_string(&array_encoder, song.filepath().c_str(),
song.filepath().size());
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encode_uint(&array_encoder, song.tags_hash());
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encode_int(&array_encoder, song.play_count());
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encode_boolean(&array_encoder, song.is_tombstoned());
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
err = cbor_encoder_close_container(enc, &array_encoder);
if (err != CborNoError && err != CborErrorOutOfMemory) {
ESP_LOGE(kTag, "encoding err %u", err);
return;
}
});
std::string as_str(reinterpret_cast<char*>(buf), buf_len);
delete buf;
return OwningSlice(as_str);
}
auto ParseDataValue(const leveldb::Slice& slice) -> std::optional<SongData> {
CborParser parser;
CborValue container;
CborError err;
err = cbor_parser_init(reinterpret_cast<const uint8_t*>(slice.data()),
slice.size(), 0, &parser, &container);
if (err != CborNoError || !cbor_value_is_container(&container)) {
return {};
}
CborValue val;
err = cbor_value_enter_container(&container, &val);
if (err != CborNoError || !cbor_value_is_unsigned_integer(&val)) {
return {};
}
uint64_t raw_int;
err = cbor_value_get_uint64(&val, &raw_int);
if (err != CborNoError) {
return {};
}
SongId id = raw_int;
err = cbor_value_advance(&val);
if (err != CborNoError || !cbor_value_is_text_string(&val)) {
return {};
}
char* raw_path;
std::size_t len;
err = cbor_value_dup_text_string(&val, &raw_path, &len, &val);
if (err != CborNoError || !cbor_value_is_unsigned_integer(&val)) {
return {};
}
std::string path(raw_path, len);
delete raw_path;
err = cbor_value_get_uint64(&val, &raw_int);
if (err != CborNoError) {
return {};
}
uint64_t hash = raw_int;
err = cbor_value_advance(&val);
if (err != CborNoError || !cbor_value_is_unsigned_integer(&val)) {
return {};
}
err = cbor_value_get_uint64(&val, &raw_int);
if (err != CborNoError) {
return {};
}
uint32_t play_count = raw_int;
err = cbor_value_advance(&val);
if (err != CborNoError || !cbor_value_is_boolean(&val)) {
return {};
}
bool is_tombstoned;
err = cbor_value_get_boolean(&val, &is_tombstoned);
if (err != CborNoError) {
return {};
}
return SongData(id, path, hash, play_count, is_tombstoned);
}
auto CreateHashKey(const uint64_t& hash) -> OwningSlice {
std::ostringstream output;
output.put(kHashPrefix).put(kFieldSeparator);
uint8_t buf[16];
CborEncoder enc;
cbor_encoder_init(&enc, buf, sizeof(buf), 0);
cbor_encode_uint(&enc, hash);
std::size_t len = cbor_encoder_get_buffer_size(&enc, buf);
output.write(reinterpret_cast<char*>(buf), len);
return OwningSlice(output.str());
}
auto ParseHashValue(const leveldb::Slice& slice) -> std::optional<SongId> {
return BytesToSongId(slice.ToString());
}
auto CreateHashValue(SongId id) -> OwningSlice {
return SongIdToBytes(id);
}
auto SongIdToBytes(SongId id) -> OwningSlice {
uint8_t buf[8];
CborEncoder enc;
cbor_encoder_init(&enc, buf, sizeof(buf), 0);
cbor_encode_uint(&enc, id);
std::size_t len = cbor_encoder_get_buffer_size(&enc, buf);
std::string as_str(reinterpret_cast<char*>(buf), len);
return OwningSlice(as_str);
}
auto BytesToSongId(const std::string& bytes) -> std::optional<SongId> {
CborParser parser;
CborValue val;
cbor_parser_init(reinterpret_cast<const uint8_t*>(bytes.data()), bytes.size(),
0, &parser, &val);
if (!cbor_value_is_unsigned_integer(&val)) {
return {};
}
uint64_t raw_id;
cbor_value_get_uint64(&val, &raw_id);
return raw_id;
}
} // namespace database
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