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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2012-06-27 20:24:17 -0500 |
|---|---|---|
| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2012-06-27 20:24:17 -0500 |
| commit | 5ab7fce9b284448b91ae2ae78aeb46a7c688adcf (patch) | |
| tree | 323acf28cbdd808d3cc2d6b4a6f9627327d9e278 /src/tools/qdatastream.cpp | |
| parent | e20b43430837963d47b87d290be7a0996182c8a9 (diff) | |
| download | qt3-5ab7fce9b284448b91ae2ae78aeb46a7c688adcf.tar.gz qt3-5ab7fce9b284448b91ae2ae78aeb46a7c688adcf.zip | |
Make basic integer QDataStream reads resistant to corruption from underlying IO device failure
Diffstat (limited to 'src/tools/qdatastream.cpp')
| -rw-r--r-- | src/tools/qdatastream.cpp | 80 |
1 files changed, 45 insertions, 35 deletions
diff --git a/src/tools/qdatastream.cpp b/src/tools/qdatastream.cpp index dfdc20e..2cdd5f7 100644 --- a/src/tools/qdatastream.cpp +++ b/src/tools/qdatastream.cpp @@ -544,7 +544,10 @@ QDataStream &QDataStream::operator>>( Q_INT8 &i ) i = (buf[2] & 0x07)+((buf[1] & 0x07) << 3)+((buf[0] & 0x07) << 6); } } else { // data or text - i = (Q_INT8)dev->getch(); + int ret = dev->getch(); + if (ret >= 0) { + i = (Q_INT8)ret; + } } return *this; } @@ -574,9 +577,10 @@ QDataStream &QDataStream::operator>>( Q_INT16 &i ) } else { // swap bytes register uchar *p = (uchar *)(&i); char b[2]; - dev->readBlock( b, 2 ); - *p++ = b[1]; - *p = b[0]; + if (dev->readBlock( b, 2 ) >= 2) { + *p++ = b[1]; + *p = b[0]; + } } return *this; } @@ -606,11 +610,12 @@ QDataStream &QDataStream::operator>>( Q_INT32 &i ) } else { // swap bytes uchar *p = (uchar *)(&i); char b[4]; - dev->readBlock( b, 4 ); - *p++ = b[3]; - *p++ = b[2]; - *p++ = b[1]; - *p = b[0]; + if (dev->readBlock( b, 4 ) >= 4) { + *p++ = b[3]; + *p++ = b[2]; + *p++ = b[1]; + *p = b[0]; + } } return *this; } @@ -643,15 +648,16 @@ QDataStream &QDataStream::operator>>( Q_INT64 &i ) } else { // swap bytes uchar *p = (uchar *)(&i); char b[8]; - dev->readBlock( b, 8 ); - *p++ = b[7]; - *p++ = b[6]; - *p++ = b[5]; - *p++ = b[4]; - *p++ = b[3]; - *p++ = b[2]; - *p++ = b[1]; - *p = b[0]; + if (dev->readBlock( b, 8 ) >= 8) { + *p++ = b[7]; + *p++ = b[6]; + *p++ = b[5]; + *p++ = b[4]; + *p++ = b[3]; + *p++ = b[2]; + *p++ = b[1]; + *p = b[0]; + } } return *this; } @@ -683,9 +689,11 @@ QDataStream &QDataStream::operator>>( Q_LONG &i ) } else { // swap bytes register uchar *p = (uchar *)(&i); char b[sizeof(Q_LONG)]; - dev->readBlock( b, sizeof(Q_LONG) ); - for ( int j = sizeof(Q_LONG); j; ) - *p++ = b[--j]; + if (dev->readBlock( b, sizeof(Q_LONG) ) >= (int)sizeof(Q_LONG)) { + for ( int j = sizeof(Q_LONG); j; ) { + *p++ = b[--j]; + } + } } return *this; } @@ -724,11 +732,12 @@ QDataStream &QDataStream::operator>>( float &f ) } else { // swap bytes uchar *p = (uchar *)(&f); char b[4]; - dev->readBlock( b, 4 ); - *p++ = b[3]; - *p++ = b[2]; - *p++ = b[1]; - *p = b[0]; + if (dev->readBlock( b, 4 ) >= 4) { + *p++ = b[3]; + *p++ = b[2]; + *p++ = b[1]; + *p = b[0]; + } } return *this; } @@ -752,15 +761,16 @@ QDataStream &QDataStream::operator>>( double &f ) } else { // swap bytes register uchar *p = (uchar *)(&f); char b[8]; - dev->readBlock( b, 8 ); - *p++ = b[7]; - *p++ = b[6]; - *p++ = b[5]; - *p++ = b[4]; - *p++ = b[3]; - *p++ = b[2]; - *p++ = b[1]; - *p = b[0]; + if (dev->readBlock( b, 8 ) >= 8) { + *p++ = b[7]; + *p++ = b[6]; + *p++ = b[5]; + *p++ = b[4]; + *p++ = b[3]; + *p++ = b[2]; + *p++ = b[1]; + *p = b[0]; + } } return *this; } |