TorrentDecoder/bencodeparser.cpp at master · Qualit/TorrentDecoder · GitHub

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#include"bencodeparser.h"

 #include<QList>
 #include<QMetaType>

BencodeParser::BencodeParser()
 {
 }

boolBencodeParser::parse(const QByteArray &content)
 {
if (content.isEmpty()) {
 errString = QString("No content");
returnfalse;
 }

this->content = content;
 index = 0;
 infoStart = 0;
 infoLength = 0;
returngetDictionary(&dictionaryValue);
 }

 QString BencodeParser::errorString() const
 {
return errString;
 }

 QMap<QByteArray, QVariant> BencodeParser::dictionary() const
 {
return dictionaryValue;
 }

 QByteArray BencodeParser::infoSection() const
 {
return content.mid(infoStart, infoLength);
 }

boolBencodeParser::getByteString(QByteArray *byteString)
 {
constint contentSize = content.size();
int size = -1;
do {
char c = content.at(index);
if (c < '0' || c > '9') {
if (size == -1)
returnfalse;
if (c != ':') {
 errString = QString("Unexpected character at pos %1: %2")
 .arg(index).arg(c);
returnfalse;
 }
 ++index;
break;
 }
if (size == -1)
 size = 0;
 size *= 10;
 size += c - '0';
 } while (++index < contentSize);

if (byteString)
 *byteString = content.mid(index, size);
 index += size;
returntrue;
 }

boolBencodeParser::getInteger(qint64 *integer)
 {
constint contentSize = content.size();
if (content.at(index) != 'i')
returnfalse;

 ++index;
 qint64 num = -1;
bool negative = false;

do {
char c = content.at(index);
if (c < '0' || c > '9') {
if (num == -1) {
if (c != '-' || negative)
returnfalse;
 negative = true;
continue;
 } else {
if (c != 'e') {
 errString = QString("Unexpected character at pos %1: %2")
 .arg(index).arg(c);
returnfalse;
 }
 ++index;
break;
 }
 }
if (num == -1)
 num = 0;
 num *= 10;
 num += c - '0';
 } while (++index < contentSize);

if (integer)
 *integer = negative ? -num : num;
returntrue;
 }

boolBencodeParser::getList(QList<QVariant> *list)
 {
constint contentSize = content.size();
if (content.at(index) != 'l')
returnfalse;

 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;
elseif (getByteString(&byteString))
 tmp << byteString;
elseif (getList(&tmpList))
 tmp << tmpList;
elseif (getDictionary(&dictionary))
 tmp << QVariant::fromValue<QMap<QByteArray, QVariant> >(dictionary);
else {
 errString = QString("error at index %1").arg(index);
returnfalse;
 }
 } while (index < contentSize);

if (list)
 *list = tmp;
returntrue;
 }

boolBencodeParser::getDictionary(QMap<QByteArray, QVariant> *dictionary)
 {
constint contentSize = content.size();
if (content.at(index) != 'd')
returnfalse;

 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);
elseif (getByteString(&byteString))
 tmp.insert(key, byteString);
elseif (getList(&tmpList))
 tmp.insert(key, tmpList);
elseif (getDictionary(&dictionary))
 tmp.insert(key, QVariant::fromValue<QMap<QByteArray, QVariant> >(dictionary));
else {
 errString = QString("error at index %1").arg(index);
returnfalse;
 }

if (key == "info")
 infoLength = index - infoStart;

 } while (index < contentSize);

if (dictionary)
 *dictionary = tmp;
returntrue;
 }