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Added reader/writer align.

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This commit is contained in:
Branimir Karadžić
2016-11-03 19:17:31 -07:00
parent 87816ad3be
commit 64523d3785
1 changed files with 35 additions and 0 deletions
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35
include/bx/readerwriter.h
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@@ -223,6 +223,41 @@ namespace bx
{
};
/// Align reader stream.
inline int32_t align(ReaderSeekerI* _reader, uint32_t _alignment, Error* _err = NULL)
{
BX_ERROR_SCOPE(_err);
const int64_t current = bx::seek(_reader);
const int64_t aligned = ( (current + _alignment-1)/_alignment) * _alignment;
const int32_t size = int32_t(aligned - current);
if (0 != size)
{
const int64_t offset = bx::seek(_reader, size);
if (offset != aligned)
{
BX_ERROR_SET(_err, BX_ERROR_READERWRITER_WRITE, "Align: read truncated.");
}
return int32_t(offset - current);
}
return 0;
}
/// Align writer stream (pads stream with zeros).
inline int32_t align(WriterSeekerI* _writer, uint32_t _alignment, Error* _err = NULL)
{
BX_ERROR_SCOPE(_err);
const int64_t current = bx::seek(_writer);
const int64_t aligned = ( (current + _alignment-1)/_alignment) * _alignment;
const int32_t size = int32_t(aligned - current);
if (0 != size)
{
return writeRep(_writer, 0, size, _err);
}
return 0;
}
struct BX_NO_VTABLE ReaderOpenI
{
virtual ~ReaderOpenI() = 0;