mirror of https://github.com/aria2/aria2
759 lines
18 KiB
C++
759 lines
18 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2012 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "JsonParser.h"
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#include <cassert>
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#include "StructParserStateMachine.h"
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#include "util.h"
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namespace aria2 {
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namespace json {
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namespace {
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enum {
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JSON_FINISH,
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JSON_ERROR,
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JSON_VALUE,
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JSON_OBJECT_KEY,
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JSON_OBJECT_VAL,
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JSON_OBJECT_SEP,
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JSON_ARRAY,
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JSON_ARRAY_SEP,
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JSON_STRING,
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JSON_STRING_ESCAPE,
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JSON_STRING_UNICODE,
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JSON_STRING_LOW_SURROGATE_ESCAPE,
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JSON_STRING_LOW_SURROGATE_U,
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JSON_STRING_LOW_SURROGATE,
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JSON_NUMBER,
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JSON_NUMBER_FRAC,
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JSON_NUMBER_EXP_SIGN,
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JSON_NUMBER_EXP,
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JSON_TRUE,
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JSON_FALSE,
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JSON_NULL
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};
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} // namespace
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namespace {
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const char JSON_TRUE_STR[] = "true";
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const char JSON_FALSE_STR[] = "false";
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const char JSON_NULL_STR[] = "null";
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} // namespace
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JsonParser::JsonParser(StructParserStateMachine* psm)
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: psm_(psm),
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currentState_(JSON_VALUE),
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codepoint_(0),
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codepoint2_(0),
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numberSign_(1),
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number_(0),
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frac_(0),
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expSign_(1),
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exp_(0),
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numConsumed_(0),
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lastError_(0)
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{
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stateStack_.push(JSON_FINISH);
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}
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JsonParser::~JsonParser()
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{}
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namespace {
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bool isSpace(char c)
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{
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return util::isLws(c) || util::isCRLF(c);
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}
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} // namespace
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ssize_t JsonParser::parseUpdate(const char* data, size_t size)
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{
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size_t i;
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if(currentState_ == JSON_FINISH) {
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return 0;
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} else if(currentState_ == JSON_ERROR) {
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return lastError_;
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}
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for(i = 0; i < size && currentState_ != JSON_FINISH; ++i) {
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char c = data[i];
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switch(currentState_) {
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case JSON_ARRAY:
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if(c == ']') {
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onArrayEnd();
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break;
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} else if(isSpace(c)) {
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break;
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} else {
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int rv = pushState(currentState_);
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if(rv < 0) {
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return rv;
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}
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currentState_ = JSON_VALUE;
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runBeginCallback(STRUCT_ARRAY_DATA_T);
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}
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// Fall through
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case JSON_VALUE:
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switch(c) {
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case '{':
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currentState_ = JSON_OBJECT_KEY;
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runBeginCallback(STRUCT_DICT_T);
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break;
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case'[':
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currentState_ = JSON_ARRAY;
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runBeginCallback(STRUCT_ARRAY_T);
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break;
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case '"':
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currentState_ = JSON_STRING;
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runBeginCallback(STRUCT_STRING_T);
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break;
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case '-':
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number_ = 0;
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numberSign_ = -1;
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numConsumed_ = 0;
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currentState_ = JSON_NUMBER;
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runBeginCallback(STRUCT_NUMBER_T);
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break;
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case 't':
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numConsumed_ = 1;
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currentState_ = JSON_TRUE;
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runBeginCallback(STRUCT_BOOL_T);
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break;
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case 'f':
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numConsumed_ = 1;
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currentState_ = JSON_FALSE;
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runBeginCallback(STRUCT_BOOL_T);
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break;
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case 'n':
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numConsumed_ = 1;
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currentState_ = JSON_NULL;
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runBeginCallback(STRUCT_NULL_T);
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break;
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default:
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if(util::isDigit(c)) {
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number_ = c - '0';
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numberSign_ = 1;
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numConsumed_ = 1;
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currentState_ = JSON_NUMBER;
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runBeginCallback(STRUCT_NUMBER_T);
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} else if(!isSpace(c)) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_CHAR_BEFORE_VAL;
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}
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}
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break;
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case JSON_TRUE:
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if(JSON_TRUE_STR[numConsumed_] == c) {
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++numConsumed_;
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if(numConsumed_ == sizeof(JSON_TRUE_STR)-1) {
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runBoolCallback(true);
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onBoolEnd();
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}
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} else {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_LITERAL;
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}
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break;
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case JSON_FALSE:
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if(JSON_FALSE_STR[numConsumed_] == c) {
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++numConsumed_;
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if(numConsumed_ == sizeof(JSON_FALSE_STR)-1) {
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runBoolCallback(false);
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onBoolEnd();
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}
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} else {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_LITERAL;
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}
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break;
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case JSON_NULL:
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if(JSON_NULL_STR[numConsumed_] == c) {
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++numConsumed_;
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if(numConsumed_ == sizeof(JSON_NULL_STR)-1) {
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onNullEnd();
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}
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} else {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_LITERAL;
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}
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break;
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case JSON_OBJECT_KEY:
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switch(c) {
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case '"': {
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int rv = pushState(currentState_);
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if(rv < 0) {
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return rv;
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}
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currentState_ = JSON_STRING;
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runBeginCallback(STRUCT_DICT_KEY_T);
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break;
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}
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case '}':
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onObjectEnd();
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break;
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default:
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if(!isSpace(c)) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_CHAR_BEFORE_OBJ_KEY;
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}
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}
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break;
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case JSON_OBJECT_VAL:
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switch(c) {
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case ':':
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pushState(currentState_);
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currentState_ = JSON_VALUE;
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runBeginCallback(STRUCT_DICT_DATA_T);
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break;
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default:
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if(!isSpace(c)) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_CHAR_BEFORE_OBJ_VAL;
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}
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}
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break;
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case JSON_OBJECT_SEP:
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switch(c) {
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case ',':
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currentState_ = JSON_OBJECT_KEY;
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break;
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case '}':
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onObjectEnd();
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break;
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default:
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if(!isSpace(c)) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_CHAR_BEFORE_OBJ_SEP;
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}
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}
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break;
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case JSON_ARRAY_SEP:
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switch(c) {
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case ',':
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pushState(JSON_ARRAY);
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currentState_ = JSON_VALUE;
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runBeginCallback(STRUCT_ARRAY_DATA_T);
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break;
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case ']':
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onArrayEnd();
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break;
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default:
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if(!isSpace(c)) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_UNEXPECTED_CHAR_BEFORE_ARRAY_SEP;
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}
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}
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break;
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case JSON_STRING:
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switch(c) {
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case '"':
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onStringEnd();
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break;
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case '\\':
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currentState_ = JSON_STRING_ESCAPE;
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break;
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default: {
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size_t j;
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for(j = i; j < size && data[j] != '\\' && data[j] != '"'; ++j);
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if(j - i >= 1) {
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runCharactersCallback(&data[i], j - i);
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}
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i = j - 1;
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break;
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}
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}
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break;
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case JSON_STRING_ESCAPE:
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switch(c) {
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case 'u':
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codepoint_ = 0;
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numConsumed_ = 0;
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currentState_ = JSON_STRING_UNICODE;
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break;
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default:
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switch(c) {
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case 'b':
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runCharactersCallback("\b", 1);
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break;
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case 'f':
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runCharactersCallback("\f", 1);
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break;
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case 'n':
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runCharactersCallback("\n", 1);
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break;
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case 'r':
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runCharactersCallback("\r", 1);
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break;
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case 't':
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runCharactersCallback("\t", 1);
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break;
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default: {
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char temp[1];
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temp[0] = c;
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runCharactersCallback(temp, 1);
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break;
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}
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}
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currentState_ = JSON_STRING;
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}
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break;
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case JSON_STRING_UNICODE: {
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size_t j;
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for(j = i; j < size && currentState_ == JSON_STRING_UNICODE; ++j) {
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if(util::isHexDigit(data[j])) {
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consumeUnicode(data[j]);
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} else {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_UNICODE_POINT;
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}
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}
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i = j - 1;
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break;
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}
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case JSON_STRING_LOW_SURROGATE_ESCAPE:
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switch(c) {
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case '\\':
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currentState_ = JSON_STRING_LOW_SURROGATE_U;
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break;
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default:
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_UNICODE_POINT;
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}
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break;
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case JSON_STRING_LOW_SURROGATE_U:
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switch(c) {
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case 'u':
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codepoint2_ = 0;
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numConsumed_ = 0;
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currentState_ = JSON_STRING_LOW_SURROGATE;
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break;
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default:
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_UNICODE_POINT;
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}
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break;
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case JSON_STRING_LOW_SURROGATE: {
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size_t j;
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for(j = i; j < size && currentState_ == JSON_STRING_LOW_SURROGATE; ++j) {
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if(util::isHexDigit(data[j])) {
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int rv = consumeLowSurrogate(data[j]);
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if(rv != 0) {
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currentState_ = JSON_ERROR;
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lastError_ = rv;
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return rv;
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}
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} else {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_UNICODE_POINT;
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}
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}
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i = j - 1;
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break;
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}
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case JSON_NUMBER: {
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size_t j;
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for(j = i; j < size && in(data[j], '0', '9'); ++j) {
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if((INT64_MAX - (data[j] - '0'))/ 10 < number_) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_NUMBER_OUT_OF_RANGE;
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}
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number_ *= 10;
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number_ += data[j] - '0';
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}
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numConsumed_ += j - i;
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if(j != size) {
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if(numConsumed_ == 0) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_NUMBER;
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}
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switch(data[j]) {
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case '.':
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frac_ = 0;
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numConsumed_ = 0;
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currentState_ = JSON_NUMBER_FRAC;
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i = j;
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break;
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case 'e':
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case 'E':
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expSign_ = 1;
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exp_ = 0;
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numConsumed_ = 0;
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currentState_ = JSON_NUMBER_EXP_SIGN;
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i = j;
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break;
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default:
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onNumberEnd();
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i = j - 1;
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}
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} else {
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i = j - 1;
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}
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break;
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}
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case JSON_NUMBER_FRAC: {
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size_t j;
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for(j = i; j < size && in(data[j], '0', '9'); ++j) {
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// Take into account at most 8 digits
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if(frac_ < 100000000) {
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frac_ *= 10;
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frac_ += data[j] - '0';
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}
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}
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numConsumed_ += j - i;
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if(j != size) {
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if(numConsumed_ == 0) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_NUMBER;
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}
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switch(data[j]) {
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case 'e':
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case 'E':
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exp_ = 0;
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numConsumed_ = 0;
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currentState_ = JSON_NUMBER_EXP_SIGN;
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i = j;
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break;
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default:
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i = j - 1;
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onNumberEnd();
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}
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} else {
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i = j - 1;
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}
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break;
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}
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case JSON_NUMBER_EXP_SIGN:
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switch(c) {
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case '+':
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currentState_ = JSON_NUMBER_EXP;
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break;
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case '-':
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expSign_ = -1;
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currentState_ = JSON_NUMBER_EXP;
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break;
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default:
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break;
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}
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if(currentState_ == JSON_NUMBER_EXP) {
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break;
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} else {
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currentState_ = JSON_NUMBER_EXP;
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// Fall through
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}
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case JSON_NUMBER_EXP: {
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size_t j;
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for(j = i; j < size && in(data[j], '0', '9'); ++j) {
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// Take into account at most 8 digits
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exp_ *= 10;
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exp_ += data[j] - '0';
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if(exp_ > 18) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_NUMBER_OUT_OF_RANGE;
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}
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}
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numConsumed_ += j - i;
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if(j != size) {
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if(numConsumed_ == 0) {
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currentState_ = JSON_ERROR;
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return lastError_ = ERR_INVALID_NUMBER;
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}
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switch(data[j]) {
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default:
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onNumberEnd();
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}
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}
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i = j - 1;
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break;
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}
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}
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}
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return i;
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}
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ssize_t JsonParser::parseFinal(const char* data, size_t len)
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{
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ssize_t rv;
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rv = parseUpdate(data, len);
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if(rv >= 0) {
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if(currentState_ != JSON_FINISH) {
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rv = ERR_PREMATURE_DATA;
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}
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}
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return rv;
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}
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void JsonParser::reset()
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{
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psm_->reset();
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currentState_ = JSON_VALUE;
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lastError_ = 0;
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while(!stateStack_.empty()) {
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stateStack_.pop();
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}
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stateStack_.push(JSON_FINISH);
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}
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void JsonParser::onStringEnd()
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{
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runEndCallback(stateTop() == JSON_OBJECT_KEY ?
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STRUCT_DICT_KEY_T : STRUCT_STRING_T);
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onValueEnd();
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}
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void JsonParser::onNumberEnd()
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{
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runNumberCallback(numberSign_ * number_, frac_, expSign_ * exp_);
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runEndCallback(STRUCT_NUMBER_T);
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onValueEnd();
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}
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void JsonParser::onObjectEnd()
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{
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runEndCallback(STRUCT_DICT_T);
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onValueEnd();
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}
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void JsonParser::onArrayEnd()
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{
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runEndCallback(STRUCT_ARRAY_T);
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onValueEnd();
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}
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void JsonParser::onBoolEnd()
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{
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runEndCallback(STRUCT_BOOL_T);
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onValueEnd();
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}
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void JsonParser::onNullEnd()
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{
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runEndCallback(STRUCT_NULL_T);
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onValueEnd();
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}
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void JsonParser::onValueEnd()
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{
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switch(stateTop()) {
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case JSON_OBJECT_KEY:
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popState();
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currentState_ = JSON_OBJECT_VAL;
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break;
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case JSON_OBJECT_VAL:
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|
runEndCallback(STRUCT_DICT_DATA_T);
|
|
popState();
|
|
currentState_ = JSON_OBJECT_SEP;
|
|
break;
|
|
case JSON_ARRAY:
|
|
runEndCallback(STRUCT_ARRAY_DATA_T);
|
|
popState();
|
|
currentState_ = JSON_ARRAY_SEP;
|
|
break;
|
|
default:
|
|
assert(stateTop() == JSON_FINISH);
|
|
currentState_ = stateTop();
|
|
break;
|
|
}
|
|
}
|
|
|
|
int JsonParser::pushState(int state)
|
|
{
|
|
if(stateStack_.size() >= 50) {
|
|
return ERR_STRUCTURE_TOO_DEEP;
|
|
} else {
|
|
stateStack_.push(state);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int JsonParser::stateTop() const
|
|
{
|
|
return stateStack_.top();
|
|
}
|
|
|
|
int JsonParser::popState()
|
|
{
|
|
int state = stateStack_.top();
|
|
stateStack_.pop();
|
|
return state;
|
|
}
|
|
|
|
void JsonParser::consumeUnicode(char c)
|
|
{
|
|
codepoint_ *= 16;
|
|
codepoint_ += util::hexCharToUInt(c);
|
|
++numConsumed_;
|
|
if(numConsumed_ == 4) {
|
|
if(in(codepoint_, 0xD800u, 0xDBFFu)) {
|
|
// This is high-surrogate codepoint
|
|
currentState_ = JSON_STRING_LOW_SURROGATE_ESCAPE;
|
|
} else {
|
|
char temp[3];
|
|
size_t len;
|
|
if(codepoint_ <= 0x007fu) {
|
|
temp[0] = static_cast<char>(codepoint_);
|
|
len = 1;
|
|
} else if(codepoint_ <= 0x07ffu) {
|
|
temp[0] = 0xC0u | (codepoint_ >> 6);
|
|
temp[1] = 0x80u | (codepoint_ & 0x003fu);
|
|
len = 2;
|
|
} else {
|
|
temp[0] = 0xE0u | (codepoint_ >> 12);
|
|
temp[1] = 0x80u | ((codepoint_ >> 6) & 0x003Fu);
|
|
temp[2] = 0x80u | (codepoint_ & 0x003Fu);
|
|
len = 3;
|
|
}
|
|
runCharactersCallback(temp, len);
|
|
currentState_ = JSON_STRING;
|
|
}
|
|
}
|
|
}
|
|
|
|
int JsonParser::consumeLowSurrogate(char c)
|
|
{
|
|
codepoint2_ *= 16;
|
|
codepoint2_ += util::hexCharToUInt(c);
|
|
++numConsumed_;
|
|
if(numConsumed_ == 4) {
|
|
if(!in(codepoint2_, 0xDC00u, 0xDFFFu)) {
|
|
return ERR_INVALID_UNICODE_POINT;
|
|
}
|
|
uint32_t fullcodepoint = 0x010000u;
|
|
fullcodepoint += (codepoint_ & 0x03FFu) << 10;
|
|
fullcodepoint += (codepoint2_ & 0x03FFu);
|
|
char temp[4];
|
|
temp[0] = 0xf0u | (fullcodepoint >> 18);
|
|
temp[1] = 0x80u | ((fullcodepoint >> 12) & 0x003Fu);
|
|
temp[2] = 0x80u | ((fullcodepoint >> 6) & 0x003Fu);
|
|
temp[3] = 0x80u | (fullcodepoint & 0x003Fu);
|
|
runCharactersCallback(temp, sizeof(temp));
|
|
currentState_ = JSON_STRING;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void JsonParser::runBeginCallback(int elementType)
|
|
{
|
|
// switch(elementType) {
|
|
// case STRUCT_DICT_T:
|
|
// std::cout << "object start" << std::endl;
|
|
// break;
|
|
// case STRUCT_DICT_KEY_T:
|
|
// std::cout << "object key start" << std::endl;
|
|
// break;
|
|
// case STRUCT_DICT_DATA_T:
|
|
// std::cout << "object data start" << std::endl;
|
|
// break;
|
|
// case STRUCT_ARRAY_T:
|
|
// std::cout << "array start" << std::endl;
|
|
// break;
|
|
// case STRUCT_ARRAY_DATA_T:
|
|
// std::cout << "array data start" << std::endl;
|
|
// break;
|
|
// case STRUCT_STRING_T:
|
|
// std::cout << "string start" << std::endl;
|
|
// break;
|
|
// case STRUCT_NUMBER_T:
|
|
// std::cout << "number start" << std::endl;
|
|
// break;
|
|
// case STRUCT_BOOL_T:
|
|
// std::cout << "bool start" << std::endl;
|
|
// break;
|
|
// case STRUCT_NULL_T:
|
|
// std::cout << "null start" << std::endl;
|
|
// break;
|
|
// default:
|
|
// break;
|
|
// };
|
|
psm_->beginElement(elementType);
|
|
}
|
|
|
|
void JsonParser::runEndCallback(int elementType)
|
|
{
|
|
// switch(elementType) {
|
|
// case STRUCT_DICT_T:
|
|
// std::cout << "object end" << std::endl;
|
|
// break;
|
|
// case STRUCT_DICT_KEY_T:
|
|
// std::cout << "object key end" << std::endl;
|
|
// break;
|
|
// case STRUCT_DICT_DATA_T:
|
|
// std::cout << "object data end" << std::endl;
|
|
// break;
|
|
// case STRUCT_ARRAY_T:
|
|
// std::cout << "array end" << std::endl;
|
|
// break;
|
|
// case STRUCT_ARRAY_DATA_T:
|
|
// std::cout << "array data end" << std::endl;
|
|
// break;
|
|
// case STRUCT_STRING_T:
|
|
// std::cout << "string end" << std::endl;
|
|
// break;
|
|
// case STRUCT_NUMBER_T:
|
|
// std::cout << "number end" << std::endl;
|
|
// break;
|
|
// case STRUCT_BOOL_T:
|
|
// std::cout << "bool end" << std::endl;
|
|
// break;
|
|
// case STRUCT_NULL_T:
|
|
// std::cout << "null end" << std::endl;
|
|
// break;
|
|
// default:
|
|
// break;
|
|
// };
|
|
psm_->endElement(elementType);
|
|
}
|
|
|
|
void JsonParser::runCharactersCallback(const char* data, size_t len)
|
|
{
|
|
psm_->charactersCallback(data, len);
|
|
}
|
|
|
|
void JsonParser::runNumberCallback(int64_t number, int frac, int exp)
|
|
{
|
|
psm_->numberCallback(number, frac, exp);
|
|
}
|
|
|
|
void JsonParser::runBoolCallback(bool bval)
|
|
{
|
|
psm_->boolCallback(bval);
|
|
}
|
|
|
|
} // namespace json
|
|
|
|
} // namespace aria2
|