205 lines
5.5 KiB
C++
205 lines
5.5 KiB
C++
// Copyright (c) 2012-2015, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#include "KVBinaryInputStreamSerializer.h"
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#include <algorithm>
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#include <cassert>
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#include <cstring>
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#include <stdexcept>
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#include "KVBinaryCommon.h"
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using Common::JsonValue;
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using namespace CryptoNote;
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namespace {
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void strictRead(std::istream& s, void* ptr, size_t size) {
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if (s.read(reinterpret_cast<char*>(ptr), size).gcount() != size) {
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throw std::runtime_error("read error");
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}
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}
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template <typename T>
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T readPod(std::istream& s) {
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T v;
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strictRead(s, &v, sizeof(T));
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return v;
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}
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template <typename T, typename JsonT = T>
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JsonValue readPodJson(std::istream& s) {
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JsonValue jv;
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jv = static_cast<JsonT>(readPod<T>(s));
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return jv;
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}
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template <typename T>
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JsonValue readIntegerJson(std::istream& s) {
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return readPodJson<T, int64_t>(s);
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}
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size_t readVarint(std::istream& s) {
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size_t v = 0;
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uint8_t size_mask = uint8_t(s.peek()) & PORTABLE_RAW_SIZE_MARK_MASK;
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switch (size_mask) {
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case PORTABLE_RAW_SIZE_MARK_BYTE:
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v = readPod<uint8_t>(s);
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break;
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case PORTABLE_RAW_SIZE_MARK_WORD:
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v = readPod<uint16_t>(s);
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break;
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case PORTABLE_RAW_SIZE_MARK_DWORD:
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v = readPod<uint32_t>(s);
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break;
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case PORTABLE_RAW_SIZE_MARK_INT64:
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v = readPod<uint64_t>(s);
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break;
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default:
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throw std::runtime_error("unknown varint size_mask");
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}
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v >>= 2;
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return v;
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}
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std::string readString(std::istream& s) {
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auto size = readVarint(s);
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std::string str;
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str.resize(size);
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if (size) {
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strictRead(s, &str[0], size);
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}
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return str;
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}
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JsonValue readStringJson(std::istream& s) {
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return JsonValue(readString(s));
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}
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void readName(std::istream& s, std::string& name) {
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uint8_t len = readPod<uint8_t>(s);
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if (len) {
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name.resize(len);
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strictRead(s, &name[0], len);
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}
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}
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JsonValue loadValue(std::istream& stream, uint8_t type);
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JsonValue loadSection(std::istream& stream);
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JsonValue loadEntry(std::istream& stream);
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JsonValue loadArray(std::istream& stream, uint8_t itemType);
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JsonValue loadSection(std::istream& stream) {
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JsonValue sec(JsonValue::OBJECT);
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size_t count = readVarint(stream);
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std::string name;
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while (count--) {
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readName(stream, name);
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sec.insert(name, loadEntry(stream));
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}
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return sec;
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}
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JsonValue loadValue(std::istream& stream, uint8_t type) {
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switch (type) {
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case BIN_KV_SERIALIZE_TYPE_INT64: return readIntegerJson<int64_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_INT32: return readIntegerJson<int32_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_INT16: return readIntegerJson<int16_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_INT8: return readIntegerJson<int8_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_UINT64: return readIntegerJson<uint64_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_UINT32: return readIntegerJson<uint32_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_UINT16: return readIntegerJson<uint16_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_UINT8: return readIntegerJson<uint8_t>(stream);
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case BIN_KV_SERIALIZE_TYPE_DOUBLE: return readPodJson<double>(stream);
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case BIN_KV_SERIALIZE_TYPE_BOOL: return JsonValue(stream.get() != 0);
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case BIN_KV_SERIALIZE_TYPE_STRING: return readStringJson(stream);
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case BIN_KV_SERIALIZE_TYPE_OBJECT: return loadSection(stream);
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case BIN_KV_SERIALIZE_TYPE_ARRAY: return loadArray(stream, type);
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default:
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throw std::runtime_error("Unknown data type");
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break;
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}
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}
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JsonValue loadEntry(std::istream& stream) {
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uint8_t type = readPod<uint8_t>(stream);
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if (type & BIN_KV_SERIALIZE_FLAG_ARRAY) {
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type &= ~BIN_KV_SERIALIZE_FLAG_ARRAY;
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return loadArray(stream, type);
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}
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return loadValue(stream, type);
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}
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JsonValue loadArray(std::istream& stream, uint8_t itemType) {
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JsonValue arr(JsonValue::ARRAY);
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size_t count = readVarint(stream);
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while (count--) {
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arr.pushBack(loadValue(stream, itemType));
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}
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return arr;
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}
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JsonValue parseBinary(std::istream& stream) {
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auto hdr = readPod<KVBinaryStorageBlockHeader>(stream);
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if (
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hdr.m_signature_a != PORTABLE_STORAGE_SIGNATUREA ||
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hdr.m_signature_b != PORTABLE_STORAGE_SIGNATUREB) {
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throw std::runtime_error("Invalid binary storage signature");
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}
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if (hdr.m_ver != PORTABLE_STORAGE_FORMAT_VER) {
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throw std::runtime_error("Unknown binary storage format version");
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}
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return loadSection(stream);
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}
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}
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KVBinaryInputStreamSerializer::KVBinaryInputStreamSerializer(std::istream& strm) : value(parseBinary(strm)), JsonInputValueSerializer(value) {
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}
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bool KVBinaryInputStreamSerializer::binary(void* value, std::size_t size, Common::StringView name) {
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std::string str;
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if (!(*this)(str, name)) {
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return false;
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}
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if (str.size() != size) {
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throw std::runtime_error("Binary block size mismatch");
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}
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memcpy(value, str.data(), size);
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return true;
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}
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bool KVBinaryInputStreamSerializer::binary(std::string& value, Common::StringView name) {
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return (*this)(value, name); // load as string
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}
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