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Some more error checking improvements/fixes

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This commit is contained in:
Martin Tůma 2021-10-02 12:57:16 +02:00
parent 288aa195c0
commit b14dd23224
3 changed files with 14 additions and 12 deletions
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11
src/map/IMG/deltastream.cpp
View File

@ -1,6 +1,5 @@
#include "deltastream.h" #include "deltastream.h"
using namespace IMG; using namespace IMG;
static int bitSize(quint8 baseSize, bool variableSign, bool extraBit) static int bitSize(quint8 baseSize, bool variableSign, bool extraBit)
@ -19,21 +18,21 @@ static int bitSize(quint8 baseSize, bool variableSign, bool extraBit)
return bits; return bits;
} }
DeltaStream::DeltaStream(const SubFile &file, SubFile::Handle &hdl, bool DeltaStream::init(quint8 info, bool extraBit, bool extended)
quint32 length, quint8 info, bool extraBit, bool extended)
: BitStream1(file, hdl, length), _readBits(0xFFFFFFFF)
{ {
_extraBit = extraBit ? 1 : 0; _extraBit = extraBit ? 1 : 0;
if (!(sign(_lonSign) && sign(_latSign))) if (!(sign(_lonSign) && sign(_latSign)))
return; return false;
if (extended) { if (extended) {
quint32 b; quint32 b;
if (!read(1, b)) if (!read(1, b))
return; return false;
} }
_lonBits = bitSize(info & 0x0F, !_lonSign, extraBit); _lonBits = bitSize(info & 0x0F, !_lonSign, extraBit);
_latBits = bitSize(info >> 4, !_latSign, false); _latBits = bitSize(info >> 4, !_latSign, false);
_readBits = _lonBits + _latBits; _readBits = _lonBits + _latBits;
return true;
} }
bool DeltaStream::readDelta(int bits, int sign, int extraBit, bool DeltaStream::readDelta(int bits, int sign, int extraBit,

5
src/map/IMG/deltastream.h
View File

@ -7,9 +7,10 @@ namespace IMG {
class DeltaStream : public BitStream1 { class DeltaStream : public BitStream1 {
public: public:
DeltaStream(const SubFile &file, SubFile::Handle &hdl, quint32 length, DeltaStream(const SubFile &file, SubFile::Handle &hdl, quint32 length)
quint8 info, bool extraBit, bool extended); : BitStream1(file, hdl, length), _readBits(0xFFFFFFFF) {}
bool init(quint8 info, bool extraBit, bool extended);
bool readNext(qint32 &lonDelta, qint32 &latDelta) bool readNext(qint32 &lonDelta, qint32 &latDelta)
{ {
return hasNext() return hasNext()

10
src/map/IMG/rgnfile.cpp
View File

@ -218,8 +218,9 @@ bool RGNFile::polyObjects(Handle &hdl, const SubDiv *subdiv,
poly.points.append(QPointF(c.lon(), c.lat())); poly.points.append(QPointF(c.lon(), c.lat()));
qint32 lonDelta, latDelta; qint32 lonDelta, latDelta;
DeltaStream stream(*this, hdl, len, bitstreamInfo, labelPtr & 0x400000, DeltaStream stream(*this, hdl, len);
false); if (!stream.init(bitstreamInfo, labelPtr & 0x400000, false))
return false;
while (stream.readNext(lonDelta, latDelta)) { while (stream.readNext(lonDelta, latDelta)) {
pos.rx() += LS(lonDelta, (24-subdiv->bits())); pos.rx() += LS(lonDelta, (24-subdiv->bits()));
if (pos.rx() >= 0x800000 && subdiv->lon() >= 0) if (pos.rx() >= 0x800000 && subdiv->lon() >= 0)
@ -325,8 +326,9 @@ bool RGNFile::extPolyObjects(Handle &hdl, const SubDiv *subdiv, quint32 shift,
return false; return false;
qint32 lonDelta, latDelta; qint32 lonDelta, latDelta;
DeltaStream stream(*this, hdl, len - 1, bitstreamInfo, false, true); DeltaStream stream(*this, hdl, len - 1);
if (!stream.init(bitstreamInfo, false, true))
return false;
while (stream.readNext(lonDelta, latDelta)) { while (stream.readNext(lonDelta, latDelta)) {
pos.rx() += LS(lonDelta, 24-subdiv->bits()); pos.rx() += LS(lonDelta, 24-subdiv->bits());
if (pos.rx() >= 0x800000 && subdiv->lon() >= 0) if (pos.rx() >= 0x800000 && subdiv->lon() >= 0)