Improve WKBReader error checking

[dr-jts]

This improves the error checking in the WKBReader to detect field values which are out of range. The fields checked are numElems, numRings and numCoords. They are checked to ensure they are > 0 and less than MAX_INT, and that they are less than the maximum size of the WKB data (if known). This should prevent NegativeArraySizeException and OutOfMemoryError errors being caused by malformed or malicious WKB values.

Fixes #67.

Signed-off-by: Martin Davis [email protected]