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Added support for mangled POI files

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This commit is contained in:
Martin Tůma 2019-11-01 19:07:21 +01:00
parent 034647b461
commit 9a57ca69a0
2 changed files with 50 additions and 8 deletions
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56
src/data/gpiparser.cpp
View File

@ -2,6 +2,7 @@
#include <QTextCodec>
#include <QtEndian>
#include <QUrl>
#include <QBuffer>
#include "gpiparser.h"
@ -26,6 +27,32 @@ private:
QString _str;
};
#define BLOCK_KEY 0xf870b5
void demangle(quint8 *data, quint32 size, quint32 key)
{
static const unsigned char shuf[] = {
0xb, 0xc, 0xa, 0x0,
0x8, 0xf, 0x2, 0x1,
0x6, 0x4, 0x9, 0x3,
0xd, 0x5, 0x7, 0xe
};
int hiCnt = 0, loCnt;
quint8 sum = shuf[(key >> 0x10) + key + (key >> 0x18) + (key >> 8) & 0xf];
for (quint32 i = 0; i < size; i++) {
quint8 hiAdd = shuf[key >> (hiCnt << 2) & 0xf] + sum;
loCnt = (hiCnt > 6) ? 0 : hiCnt + 1;
quint8 loAdd = shuf[key >> (loCnt << 2) & 0xf] + sum;
quint8 hi = data[i] + hiAdd * 0xf0;
quint8 lo = data[i] - loAdd;
data[i] = (hi & 0xf0) | (lo & 0x0f);
hiCnt = (loCnt > 6) ? 0 : loCnt + 1;
}
}
static inline double toWGS(qint32 v)
{
return (double)(((double)v / (double)(1U<<31)) * (double)180);
@ -306,7 +333,7 @@ static quint32 readFileDataRecord(QDataStream &stream, QTextCodec *codec)
return rs + rh.size;
}
bool GPIParser::readFileHeader(QDataStream &stream)
bool GPIParser::readFileHeader(QDataStream &stream, quint32 &ebs)
{
RecordHeader rh;
quint32 ds, s7;
@ -326,10 +353,7 @@ bool GPIParser::readFileHeader(QDataStream &stream)
if (rh.flags & 8)
ds += readFprsRecord(stream);
if (s8 & 0x4) {
_errorString = "Encrypted GPI files not supported";
return false;
}
ebs = (s8 & 0x4) ? s9 * 8 + 8 : 0;
if (stream.status() != QDataStream::Ok || ds != rh.size) {
_errorString = "Invalid file header";
@ -432,13 +456,31 @@ bool GPIParser::parse(QFile *file, QList<TrackData> &tracks,
Q_UNUSED(polygons);
QDataStream stream(file);
QTextCodec *codec = 0;
quint32 ebs;
bool ret;
stream.setByteOrder(QDataStream::LittleEndian);
if (!readFileHeader(stream) || !readGPIHeader(stream, codec))
if (!readFileHeader(stream, ebs) || !readGPIHeader(stream, codec))
return false;
if (!readData(stream, codec, waypoints)) {
if (ebs) {
QByteArray ba(stream.device()->readAll());
for (int i = 0; i < (ba.size() / (int)ebs); i++)
demangle((quint8*)(ba.data() + i * ebs), ebs, BLOCK_KEY);
demangle((quint8*)(ba.data() + (ba.size() / (int)ebs) * ebs),
ba.size() - ((ba.size() / (int)ebs) * ebs), BLOCK_KEY);
QBuffer buffer(&ba);
buffer.open(QIODevice::ReadOnly);
QDataStream memStream(&buffer);
memStream.setByteOrder(QDataStream::LittleEndian);
ret = readData(memStream, codec, waypoints);
} else
ret = readData(stream, codec, waypoints);
if (!ret) {
_errorString = "Invalid/corrupted GPI data";
return false;
} else

2
src/data/gpiparser.h
View File

@ -15,7 +15,7 @@ public:
int errorLine() const {return 0;}
private:
bool readFileHeader(QDataStream &stream);
bool readFileHeader(QDataStream &stream, quint32 &ebs);
bool readGPIHeader(QDataStream &stream, QTextCodec *codec);
bool readData(QDataStream &stream, QTextCodec *codec,
QVector<Waypoint> &waypoints);