mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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383 lines
9.4 KiB
C++
383 lines
9.4 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2020
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// MIT License
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#pragma once
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#include <ArduinoJson/Deserialization/deserialize.hpp>
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#include <ArduinoJson/Memory/MemoryPool.hpp>
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#include <ArduinoJson/MsgPack/endianess.hpp>
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#include <ArduinoJson/MsgPack/ieee754.hpp>
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#include <ArduinoJson/Polyfills/type_traits.hpp>
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#include <ArduinoJson/Variant/VariantData.hpp>
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namespace ARDUINOJSON_NAMESPACE {
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template <typename TReader, typename TStringStorage>
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class MsgPackDeserializer {
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public:
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MsgPackDeserializer(MemoryPool &pool, TReader reader,
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TStringStorage stringStorage)
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: _pool(&pool),
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_reader(reader),
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_stringStorage(stringStorage),
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_error(DeserializationError::Ok) {}
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// TODO: add support for filter
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DeserializationError parse(VariantData &variant, AllowAllFilter,
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NestingLimit nestingLimit) {
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parseVariant(variant, nestingLimit);
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return _error;
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}
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private:
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bool parseVariant(VariantData &variant, NestingLimit nestingLimit) {
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uint8_t code;
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if (!readByte(code)) {
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_error = DeserializationError::IncompleteInput;
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return false;
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}
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if ((code & 0x80) == 0) {
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variant.setUnsignedInteger(code);
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return true;
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}
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if ((code & 0xe0) == 0xe0) {
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variant.setSignedInteger(static_cast<int8_t>(code));
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return true;
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}
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if ((code & 0xe0) == 0xa0) {
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return readString(variant, code & 0x1f);
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}
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if ((code & 0xf0) == 0x90) {
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return readArray(variant.toArray(), code & 0x0F, nestingLimit);
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}
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if ((code & 0xf0) == 0x80) {
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return readObject(variant.toObject(), code & 0x0F, nestingLimit);
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}
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switch (code) {
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case 0xc0:
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// already null
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return true;
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case 0xc2:
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variant.setBoolean(false);
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return true;
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case 0xc3:
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variant.setBoolean(true);
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return true;
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case 0xcc:
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return readInteger<uint8_t>(variant);
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case 0xcd:
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return readInteger<uint16_t>(variant);
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case 0xce:
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return readInteger<uint32_t>(variant);
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#if ARDUINOJSON_USE_LONG_LONG
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case 0xcf:
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return readInteger<uint64_t>(variant);
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#endif
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case 0xd0:
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return readInteger<int8_t>(variant);
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case 0xd1:
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return readInteger<int16_t>(variant);
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case 0xd2:
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return readInteger<int32_t>(variant);
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#if ARDUINOJSON_USE_LONG_LONG
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case 0xd3:
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return readInteger<int64_t>(variant);
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#endif
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case 0xca:
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return readFloat<float>(variant);
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case 0xcb:
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return readDouble<double>(variant);
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case 0xd9:
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return readString<uint8_t>(variant);
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case 0xda:
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return readString<uint16_t>(variant);
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case 0xdb:
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return readString<uint32_t>(variant);
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case 0xdc:
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return readArray<uint16_t>(variant.toArray(), nestingLimit);
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case 0xdd:
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return readArray<uint32_t>(variant.toArray(), nestingLimit);
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case 0xde:
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return readObject<uint16_t>(variant.toObject(), nestingLimit);
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case 0xdf:
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return readObject<uint32_t>(variant.toObject(), nestingLimit);
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default:
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_error = DeserializationError::NotSupported;
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return false;
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}
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}
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private:
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// Prevent VS warning "assignment operator could not be generated"
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MsgPackDeserializer &operator=(const MsgPackDeserializer &);
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bool readByte(uint8_t &value) {
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int c = _reader.read();
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if (c < 0) {
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_error = DeserializationError::IncompleteInput;
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return false;
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}
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value = static_cast<uint8_t>(c);
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return true;
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}
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bool readBytes(uint8_t *p, size_t n) {
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if (_reader.readBytes(reinterpret_cast<char *>(p), n) == n)
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return true;
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_error = DeserializationError::IncompleteInput;
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return false;
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}
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template <typename T>
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bool readBytes(T &value) {
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return readBytes(reinterpret_cast<uint8_t *>(&value), sizeof(value));
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}
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template <typename T>
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bool readInteger(T &value) {
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if (!readBytes(value))
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return false;
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fixEndianess(value);
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return true;
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}
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template <typename T>
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bool readInteger(VariantData &variant) {
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T value;
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if (!readInteger(value))
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return false;
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variant.setInteger(value);
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return true;
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}
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template <typename T>
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typename enable_if<sizeof(T) == 4, bool>::type readFloat(
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VariantData &variant) {
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T value;
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if (!readBytes(value))
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return false;
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fixEndianess(value);
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variant.setFloat(value);
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return true;
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}
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template <typename T>
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typename enable_if<sizeof(T) == 8, bool>::type readDouble(
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VariantData &variant) {
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T value;
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if (!readBytes(value))
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return false;
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fixEndianess(value);
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variant.setFloat(value);
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return true;
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}
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template <typename T>
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typename enable_if<sizeof(T) == 4, bool>::type readDouble(
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VariantData &variant) {
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uint8_t i[8]; // input is 8 bytes
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T value; // output is 4 bytes
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uint8_t *o = reinterpret_cast<uint8_t *>(&value);
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if (!readBytes(i, 8))
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return false;
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doubleToFloat(i, o);
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fixEndianess(value);
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variant.setFloat(value);
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return true;
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}
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template <typename T>
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bool readString(VariantData &variant) {
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T size;
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if (!readInteger(size))
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return false;
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return readString(variant, size);
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}
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template <typename T>
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bool readString(const char *&str) {
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T size;
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if (!readInteger(size))
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return false;
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return readString(str, size);
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}
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bool readString(VariantData &variant, size_t n) {
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const char *s = 0; // <- mute "maybe-uninitialized" (+4 bytes on AVR)
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if (!readString(s, n))
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return false;
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variant.setString(make_not_null(s),
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typename TStringStorage::storage_policy());
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return true;
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}
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bool readString(const char *&result, size_t n) {
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_stringStorage.startString();
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for (; n; --n) {
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uint8_t c;
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if (!readBytes(c))
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return false;
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_stringStorage.append(static_cast<char>(c));
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}
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_stringStorage.append('\0');
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if (!_stringStorage.isValid()) {
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_error = DeserializationError::NoMemory;
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return false;
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}
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result = _stringStorage.save();
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return true;
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}
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template <typename TSize>
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bool readArray(CollectionData &array, NestingLimit nestingLimit) {
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TSize size;
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if (!readInteger(size))
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return false;
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return readArray(array, size, nestingLimit);
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}
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bool readArray(CollectionData &array, size_t n, NestingLimit nestingLimit) {
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if (nestingLimit.reached()) {
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_error = DeserializationError::TooDeep;
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return false;
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}
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for (; n; --n) {
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VariantData *value = array.addElement(_pool);
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if (!value) {
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_error = DeserializationError::NoMemory;
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return false;
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}
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if (!parseVariant(*value, nestingLimit.decrement()))
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return false;
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}
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return true;
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}
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template <typename TSize>
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bool readObject(CollectionData &object, NestingLimit nestingLimit) {
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TSize size;
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if (!readInteger(size))
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return false;
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return readObject(object, size, nestingLimit);
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}
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bool readObject(CollectionData &object, size_t n, NestingLimit nestingLimit) {
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if (nestingLimit.reached()) {
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_error = DeserializationError::TooDeep;
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return false;
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}
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for (; n; --n) {
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VariantSlot *slot = object.addSlot(_pool);
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if (!slot) {
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_error = DeserializationError::NoMemory;
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return false;
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}
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const char *key = 0; // <- mute "maybe-uninitialized" (+4 bytes on AVR)
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if (!parseKey(key))
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return false;
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slot->setKey(key, typename TStringStorage::storage_policy());
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if (!parseVariant(*slot->data(), nestingLimit.decrement()))
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return false;
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}
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return true;
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}
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bool parseKey(const char *&key) {
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uint8_t code;
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if (!readByte(code))
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return false;
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if ((code & 0xe0) == 0xa0)
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return readString(key, code & 0x1f);
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switch (code) {
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case 0xd9:
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return readString<uint8_t>(key);
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case 0xda:
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return readString<uint16_t>(key);
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case 0xdb:
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return readString<uint32_t>(key);
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default:
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_error = DeserializationError::NotSupported;
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return false;
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}
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}
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MemoryPool *_pool;
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TReader _reader;
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TStringStorage _stringStorage;
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DeserializationError _error;
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};
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template <typename TInput>
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DeserializationError deserializeMsgPack(
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JsonDocument &doc, const TInput &input,
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NestingLimit nestingLimit = NestingLimit()) {
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return deserialize<MsgPackDeserializer>(doc, input, nestingLimit,
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AllowAllFilter());
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}
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template <typename TInput>
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DeserializationError deserializeMsgPack(
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JsonDocument &doc, TInput *input,
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NestingLimit nestingLimit = NestingLimit()) {
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return deserialize<MsgPackDeserializer>(doc, input, nestingLimit,
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AllowAllFilter());
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}
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template <typename TInput>
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DeserializationError deserializeMsgPack(
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JsonDocument &doc, TInput *input, size_t inputSize,
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NestingLimit nestingLimit = NestingLimit()) {
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return deserialize<MsgPackDeserializer>(doc, input, inputSize, nestingLimit,
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AllowAllFilter());
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}
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template <typename TInput>
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DeserializationError deserializeMsgPack(
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JsonDocument &doc, TInput &input,
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NestingLimit nestingLimit = NestingLimit()) {
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return deserialize<MsgPackDeserializer>(doc, input, nestingLimit,
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AllowAllFilter());
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}
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} // namespace ARDUINOJSON_NAMESPACE
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