mirror of https://git.tukaani.org/xz.git
tuklib_integer: Rename bswapXX to byteswapXX
The __builtin_bswapXX from GCC and Clang are preferred when they are available. This can allow compilers to emit the x86 MOVBE instruction instead of doing a load + byteswap as two instructions (which would happen if the byteswapping is done in inline asm). bswap16, bswap32, and bswap64 exist in system headers on *BSDs and Darwin. #defining bswap16 on NetBSD results in a warning about macro redefinition. It's safest to avoid this namespace conflict completely. No OS supported by tuklib_integer.h uses byteswapXX names and a web search doesn't immediately find any obvious danger of namespace conflicts. So let's try these still-pretty-short names for the macros. Thanks to Sam James for pointing out the compiler warning on NetBSD 10.0.
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@ -16,7 +16,7 @@
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///
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/// Endianness-converting integer operations (these can be macros!)
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/// (XX = 16, 32, or 64; Y = b or l):
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/// - Byte swapping: bswapXX(num)
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/// - Byte swapping: byteswapXX(num)
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/// - Byte order conversions to/from native (byteswaps if Y isn't
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/// the native endianness): convXXYe(num)
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/// - Unaligned reads: readXXYe(ptr)
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@ -66,38 +66,41 @@
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#if defined(HAVE___BUILTIN_BSWAPXX)
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// GCC >= 4.8 and Clang
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# define bswap16(n) __builtin_bswap16(n)
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# define bswap32(n) __builtin_bswap32(n)
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# define bswap64(n) __builtin_bswap64(n)
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# define byteswap16(num) __builtin_bswap16(num)
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# define byteswap32(num) __builtin_bswap32(num)
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# define byteswap64(num) __builtin_bswap64(num)
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#elif defined(HAVE_BYTESWAP_H)
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// glibc, uClibc, dietlibc
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# include <byteswap.h>
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# ifdef HAVE_BSWAP_16
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# define bswap16(num) bswap_16(num)
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# define byteswap16(num) bswap_16(num)
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# endif
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# ifdef HAVE_BSWAP_32
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# define bswap32(num) bswap_32(num)
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# define byteswap32(num) bswap_32(num)
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# endif
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# ifdef HAVE_BSWAP_64
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# define bswap64(num) bswap_64(num)
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# define byteswap64(num) bswap_64(num)
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# endif
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#elif defined(HAVE_SYS_ENDIAN_H)
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// *BSDs and Darwin
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# include <sys/endian.h>
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# define byteswap16(num) bswap16(num)
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# define byteswap32(num) bswap32(num)
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# define byteswap64(num) bswap64(num)
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#elif defined(HAVE_SYS_BYTEORDER_H)
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// Solaris
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# include <sys/byteorder.h>
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# ifdef BSWAP_16
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# define bswap16(num) BSWAP_16(num)
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# define byteswap16(num) BSWAP_16(num)
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# endif
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# ifdef BSWAP_32
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# define bswap32(num) BSWAP_32(num)
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# define byteswap32(num) BSWAP_32(num)
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# endif
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# ifdef BSWAP_64
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# define bswap64(num) BSWAP_64(num)
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# define byteswap64(num) BSWAP_64(num)
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# endif
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# ifdef BE_16
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# define conv16be(num) BE_16(num)
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@ -119,15 +122,15 @@
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# endif
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#endif
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#ifndef bswap16
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# define bswap16(n) (uint16_t)( \
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#ifndef byteswap16
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# define byteswap16(n) (uint16_t)( \
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(((n) & 0x00FFU) << 8) \
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| (((n) & 0xFF00U) >> 8) \
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)
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#endif
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#ifndef bswap32
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# define bswap32(n) (uint32_t)( \
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#ifndef byteswap32
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# define byteswap32(n) (uint32_t)( \
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(((n) & UINT32_C(0x000000FF)) << 24) \
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| (((n) & UINT32_C(0x0000FF00)) << 8) \
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| (((n) & UINT32_C(0x00FF0000)) >> 8) \
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@ -135,8 +138,8 @@
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)
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#endif
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#ifndef bswap64
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# define bswap64(n) (uint64_t)( \
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#ifndef byteswap64
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# define byteswap64(n) (uint64_t)( \
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(((n) & UINT64_C(0x00000000000000FF)) << 56) \
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| (((n) & UINT64_C(0x000000000000FF00)) << 40) \
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| (((n) & UINT64_C(0x0000000000FF0000)) << 24) \
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@ -160,23 +163,23 @@
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# define conv64be(num) ((uint64_t)(num))
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# endif
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# ifndef conv16le
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# define conv16le(num) bswap16(num)
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# define conv16le(num) byteswap16(num)
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# endif
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# ifndef conv32le
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# define conv32le(num) bswap32(num)
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# define conv32le(num) byteswap32(num)
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# endif
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# ifndef conv64le
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# define conv64le(num) bswap64(num)
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# define conv64le(num) byteswap64(num)
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# endif
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#else
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# ifndef conv16be
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# define conv16be(num) bswap16(num)
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# define conv16be(num) byteswap16(num)
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# endif
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# ifndef conv32be
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# define conv32be(num) bswap32(num)
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# define conv32be(num) byteswap32(num)
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# endif
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# ifndef conv64be
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# define conv64be(num) bswap64(num)
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# define conv64be(num) byteswap64(num)
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# endif
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# ifndef conv16le
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# define conv16le(num) ((uint16_t)(num))
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@ -34,7 +34,7 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
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crc = ~crc;
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#ifdef WORDS_BIGENDIAN
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crc = bswap32(crc);
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crc = byteswap32(crc);
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#endif
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if (size > 8) {
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@ -80,7 +80,7 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
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crc = lzma_crc32_table[0][*buf++ ^ A(crc)] ^ S8(crc);
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#ifdef WORDS_BIGENDIAN
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crc = bswap32(crc);
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crc = byteswap32(crc);
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#endif
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return ~crc;
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@ -43,7 +43,7 @@ init_crc32_table(void)
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#ifdef WORDS_BIGENDIAN
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for (size_t s = 0; s < 8; ++s)
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for (size_t b = 0; b < 256; ++b)
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crc32_table[s][b] = bswap32(crc32_table[s][b]);
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crc32_table[s][b] = byteswap32(crc32_table[s][b]);
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#endif
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return;
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@ -39,7 +39,7 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
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crc = ~crc;
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#ifdef WORDS_BIGENDIAN
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crc = bswap64(crc);
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crc = byteswap64(crc);
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#endif
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if (size > 4) {
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@ -73,7 +73,7 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
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crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
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#ifdef WORDS_BIGENDIAN
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crc = bswap64(crc);
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crc = byteswap64(crc);
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#endif
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return ~crc;
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@ -42,7 +42,7 @@ init_crc64_table(void)
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#ifdef WORDS_BIGENDIAN
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for (size_t s = 0; s < 4; ++s)
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for (size_t b = 0; b < 256; ++b)
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crc64_table[s][b] = bswap64(crc64_table[s][b]);
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crc64_table[s][b] = byteswap64(crc64_table[s][b]);
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#endif
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return;
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