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Fixed warning caused by sloppy conversion between signed/unsigned types.

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Also, the comparison between size_t max and the actual file size is done
as an unsigned long long, since that type is guaranteed to be at least
64 bits, even on a 32-bit architecture.
This commit is contained in:
John Senneker
2020-03-02 11:04:57 -05:00
parent d58436c4bd
commit a9f29b74d9
1 changed files with 17 additions and 9 deletions
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26
tinyxml2.cpp
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@@ -2278,15 +2278,23 @@ XMLError XMLDocument::LoadFile( FILE* fp )
}
TIXML_FSEEK( fp, 0, SEEK_END );
const long long filelength = TIXML_FTELL( fp );
TIXML_FSEEK( fp, 0, SEEK_SET );
if ( filelength == -1L ) {
SetError( XML_ERROR_FILE_READ_ERROR, 0, 0 );
return _errorID;
}
TIXMLASSERT( filelength >= 0 );
if ( filelength >= static_cast<size_t>(-1) ) {
unsigned long long filelength;
{
const long long fileLengthSigned = TIXML_FTELL( fp );
TIXML_FSEEK( fp, 0, SEEK_SET );
if ( fileLengthSigned == -1L ) {
SetError( XML_ERROR_FILE_READ_ERROR, 0, 0 );
return _errorID;
}
TIXMLASSERT( fileLengthSigned >= 0 );
filelength = static_cast<unsigned long long>(fileLengthSigned);
}
const size_t maxSizeT = static_cast<size_t>(-1);
// We'll do the comparison as an unsigned long long, because that's guaranteed to be at
// least 8 bytes, even on a 32-bit platform.
if ( filelength >= static_cast<unsigned long long>(maxSizeT) ) {
// Cannot handle files which won't fit in buffer together with null terminator
SetError( XML_ERROR_FILE_READ_ERROR, 0, 0 );
return _errorID;
@@ -2297,7 +2305,7 @@ XMLError XMLDocument::LoadFile( FILE* fp )
return _errorID;
}
const size_t size = filelength;
const size_t size = static_cast<size_t>(filelength);
TIXMLASSERT( _charBuffer == 0 );
_charBuffer = new char[size+1];
const size_t read = fread( _charBuffer, 1, size, fp );