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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #include "bencodeparser.h" |
| |
| #include <QList> |
| #include <QMetaType> |
| |
| BencodeParser::BencodeParser() |
| { |
| } |
| |
| bool BencodeParser::parse(const QByteArray &content) |
| { |
| if (content.isEmpty()) { |
| errString = QString("No content"); |
| return false; |
| } |
| |
| this->content = content; |
| index = 0; |
| infoStart = 0; |
| infoLength = 0; |
| return getDictionary(&dictionaryValue); |
| } |
| |
| QString BencodeParser::errorString() const |
| { |
| return errString; |
| } |
| |
| QMap<QByteArray, QVariant> BencodeParser::dictionary() const |
| { |
| return dictionaryValue; |
| } |
| |
| QByteArray BencodeParser::infoSection() const |
| { |
| return content.mid(infoStart, infoLength); |
| } |
| |
| bool BencodeParser::getByteString(QByteArray *byteString) |
| { |
| const int contentSize = content.size(); |
| int size = -1; |
| do { |
| char c = content.at(index); |
| if (c < '0' || c > '9') { |
| if (size == -1) |
| return false; |
| if (c != ':') { |
| errString = QString("Unexpected character at pos %1: %2") |
| .arg(index).arg(c); |
| return false; |
| } |
| ++index; |
| break; |
| } |
| if (size == -1) |
| size = 0; |
| size *= 10; |
| size += c - '0'; |
| } while (++index < contentSize); |
| |
| if (byteString) |
| *byteString = content.mid(index, size); |
| index += size; |
| return true; |
| } |
| |
| bool BencodeParser::getInteger(qint64 *integer) |
| { |
| const int contentSize = content.size(); |
| if (content.at(index) != 'i') |
| return false; |
| |
| ++index; |
| qint64 num = -1; |
| bool negative = false; |
| |
| do { |
| char c = content.at(index); |
| if (c < '0' || c > '9') { |
| if (num == -1) { |
| if (c != '-' || negative) |
| return false; |
| negative = true; |
| continue; |
| } else { |
| if (c != 'e') { |
| errString = QString("Unexpected character at pos %1: %2") |
| .arg(index).arg(c); |
| return false; |
| } |
| ++index; |
| break; |
| } |
| } |
| if (num == -1) |
| num = 0; |
| num *= 10; |
| num += c - '0'; |
| } while (++index < contentSize); |
| |
| if (integer) |
| *integer = negative ? -num : num; |
| return true; |
| } |
| |
| bool BencodeParser::getList(QList<QVariant> *list) |
| { |
| const int contentSize = content.size(); |
| if (content.at(index) != 'l') |
| return false; |
| |
| QList<QVariant> tmp; |
| ++index; |
| |
| do { |
| if (content.at(index) == 'e') { |
| ++index; |
| break; |
| } |
| |
| qint64 number; |
| QByteArray byteString; |
| QList<QVariant> tmpList; |
| QMap<QByteArray, QVariant> dictionary; |
| |
| if (getInteger(&number)) |
| tmp << number; |
| else if (getByteString(&byteString)) |
| tmp << byteString; |
| else if (getList(&tmpList)) |
| tmp << tmpList; |
| else if (getDictionary(&dictionary)) |
| tmp << QVariant::fromValue<QMap<QByteArray, QVariant> >(dictionary); |
| else { |
| errString = QString("error at index %1").arg(index); |
| return false; |
| } |
| } while (index < contentSize); |
| |
| if (list) |
| *list = tmp; |
| return true; |
| } |
| |
| bool BencodeParser::getDictionary(QMap<QByteArray, QVariant> *dictionary) |
| { |
| const int contentSize = content.size(); |
| if (content.at(index) != 'd') |
| return false; |
| |
| QMap<QByteArray, QVariant> tmp; |
| ++index; |
| |
| do { |
| if (content.at(index) == 'e') { |
| ++index; |
| break; |
| } |
| |
| QByteArray key; |
| if (!getByteString(&key)) |
| break; |
| |
| if (key == "info") |
| infoStart = index; |
| |
| qint64 number; |
| QByteArray byteString; |
| QList<QVariant> tmpList; |
| QMap<QByteArray, QVariant> dictionary; |
| |
| if (getInteger(&number)) |
| tmp.insert(key, number); |
| else if (getByteString(&byteString)) |
| tmp.insert(key, byteString); |
| else if (getList(&tmpList)) |
| tmp.insert(key, tmpList); |
| else if (getDictionary(&dictionary)) |
| tmp.insert(key, QVariant::fromValue<QMap<QByteArray, QVariant> >(dictionary)); |
| else { |
| errString = QString("error at index %1").arg(index); |
| return false; |
| } |
| |
| if (key == "info") |
| infoLength = index - infoStart; |
| |
| } while (index < contentSize); |
| |
| if (dictionary) |
| *dictionary = tmp; |
| return true; |
| } |