Andrew Trick 28a529ceed Fix crashes in Unsafe[Raw]BufferPointer with nil baseAddress. ...

This fix updates various initializers to handle incoming empty buffers
that happen to have a nil base. They should simply create another
buffer with nil base rather than crashing!

It is valid for an Unsafe[Raw]BufferPointer can have a nil base
address. This allows round-tripping with C code that takes a
pointer/length pair and uses `0` as the pointer value.

The original design wrongly assumed that we would use a sentinel value
for empty buffers and was never updated for or tested with the current
design.

Fixes <rdar://problem/47946984> Regression in Foundation.Data's
UnsafeBufferPointer constructor.

2019-02-11 13:38:48 -08:00

17 KiB

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