On May 26, 2014, at 4:20 PM, Graham Cox <[email protected]> wrote:
> That's just as wrong - you are using the first few bytes of the data as the
> length, which it certainly isn't (except for possibly a very few special
> cases that just so happen to have the length as the first field of the data).
No, it’s extremely common to have a data format where a variable-length field
is prefixed with its length. That looks like what this code is trying to read.
The right way to do this would be something like:
uint32_t length = *(uint32_t*)bytes;
length = CFSwapInt32BigToHost(length);
You need to be explicit about the size of integer in use (“int” has different
sizes on different platforms) and you need to convert from the byte-order used
in the file format (which is almost always big-endian.)
—Jens
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