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| author | Lasse Collin <lasse.collin@tukaani.org> | 2008-06-18 18:02:10 +0300 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2008-06-18 18:02:10 +0300 |
| commit | 7d17818cec8597f847b0a2537fde991bbc3d9e96 (patch) | |
| tree | 9c41502e3eb96f103fe98e13456b382fbba7a292 /src/common/bswap.h | |
| parent | Update the file format specification draft. The new one is (diff) | |
| download | xz-7d17818cec8597f847b0a2537fde991bbc3d9e96.tar.xz | |
Update the code to mostly match the new simpler file format
specification. Simplify things by removing most of the
support for known uncompressed size in most places.
There are some miscellaneous changes here and there too.
The API of liblzma has got many changes and still some
more will be done soon. While most of the code has been
updated, some things are not fixed (the command line tool
will choke with invalid filter chain, if nothing else).
Subblock filter is somewhat broken for now. It will be
updated once the encoded format of the Subblock filter
has been decided.
Diffstat (limited to 'src/common/bswap.h')
| -rw-r--r-- | src/common/bswap.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/common/bswap.h b/src/common/bswap.h new file mode 100644 index 00000000..8f82a8f4 --- /dev/null +++ b/src/common/bswap.h @@ -0,0 +1,44 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file bswap.h +/// \brief Byte swapping +// +// This code has been put into the public domain. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef LZMA_BSWAP_H +#define LZMA_BSWAP_H + +// NOTE: We assume that config.h is already #included. + +// byteswap.h is a GNU extension. It contains inline assembly versions +// for byteswapping. When byteswap.h is not available, we use generic code. +#ifdef HAVE_BYTESWAP_H +# include <byteswap.h> +#else +# define bswap_16(num) \ + (((num) << 8) | ((num) >> 8)) + +# define bswap_32(num) \ + ( (((num) << 24) ) \ + | (((num) << 8) & UINT32_C(0x00FF0000)) \ + | (((num) >> 8) & UINT32_C(0x0000FF00)) \ + | (((num) >> 24) ) ) + +# define bswap_64(num) \ + ( (((num) << 56) ) \ + | (((num) << 40) & UINT64_C(0x00FF000000000000)) \ + | (((num) << 24) & UINT64_C(0x0000FF0000000000)) \ + | (((num) << 8) & UINT64_C(0x000000FF00000000)) \ + | (((num) >> 8) & UINT64_C(0x00000000FF000000)) \ + | (((num) >> 24) & UINT64_C(0x0000000000FF0000)) \ + | (((num) >> 40) & UINT64_C(0x000000000000FF00)) \ + | (((num) >> 56) ) ) +#endif + +#endif |