implemented BufWriter #10451
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implemented BufWriter #10451
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Interesting, and cool! A few things:
Thanks again! |
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@alexcrichton |
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Let's put it on either the struct definition or the constructor for now. |
Filled in the implementations of Writer and Seek for BufWriter. It raises the io_error condition if a write cannot fit in the buffer. The Seek implementation for MemWriter, which was incorrectly using unsigned arithmatic to add signed offsets, has also been replaced.
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@alexcrichton |
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I implemented BufWriter. I realize the use of conditions are on their way out for IO, but it does raise a condition if a write will not fit in the buffer for now. I also replaced the seek code for MemWriter. It was adding the offset as a uint, which is unsound for negative offsets. It only happened to work because unsigned addition performs the same operation with two's complement, and sizeof(uint) <= sizeof(i64) so there was no (lack of) sign extension. I replaced this with computing an offset as an i64 and clamping to zero. I don't expect anyone will have use BufWriter with a byte buffer greater than 2^63 bytes any time soon. @alexcrichton Closes #10433
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I implemented BufWriter. I realize the use of conditions are on their way out for IO, but it does raise a condition if a write will not fit in the buffer for now.
I also replaced the seek code for MemWriter. It was adding the offset as a uint, which is unsound for negative offsets. It only happened to work because unsigned addition performs the same operation with two's complement, and sizeof(uint) <= sizeof(i64) so there was no (lack of) sign extension. I replaced this with computing an offset as an i64 and clamping to zero. I don't expect anyone will have use BufWriter with a byte buffer greater than 2^63 bytes any time soon.
@alexcrichton
Closes #10433