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Diffstat (limited to 'src/lib/byteorder.h')
| -rw-r--r-- | src/lib/byteorder.h | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/src/lib/byteorder.h b/src/lib/byteorder.h new file mode 100644 index 0000000..e7912bd --- /dev/null +++ b/src/lib/byteorder.h @@ -0,0 +1,268 @@ +/* + * Copyright (c) 2016-2017 Josef 'Jeff' Sipek <jeffpc@josefsipek.net> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#ifndef BYTEORDER_H +#define BYTEORDER_H + +/* + * These prototypes exist to catch bugs in the code generating macros below. + */ +/* return byte swapped input */ +static inline uint64_t i_bswap_64(uint64_t in); +static inline uint32_t i_bswap_32(uint32_t in); +static inline uint16_t i_bswap_16(uint16_t in); +static inline uint8_t i_bswap_8(uint8_t in); + +/* load an unaligned cpu native endian number from memory */ +static inline uint64_t cpu64_to_cpu_unaligned(const void *in); +static inline uint32_t cpu32_to_cpu_unaligned(const void *in); +static inline uint16_t cpu16_to_cpu_unaligned(const void *in); +static inline uint8_t cpu8_to_cpu_unaligned(const void *in); + +/* load an unaligned big endian number from memory */ +static inline uint64_t be64_to_cpu_unaligned(const void *in); +static inline uint32_t be32_to_cpu_unaligned(const void *in); +static inline uint16_t be16_to_cpu_unaligned(const void *in); +static inline uint8_t be8_to_cpu_unaligned(const void *in); + +/* load an unaligned little endian number from memory */ +static inline uint64_t le64_to_cpu_unaligned(const void *in); +static inline uint32_t le32_to_cpu_unaligned(const void *in); +static inline uint16_t le16_to_cpu_unaligned(const void *in); +static inline uint8_t le8_to_cpu_unaligned(const void *in); + +/* store into memory a cpu native endian number as a big endian number */ +static inline void cpu64_to_be_unaligned(uint64_t in, void *out); +static inline void cpu32_to_be_unaligned(uint32_t in, void *out); +static inline void cpu16_to_be_unaligned(uint16_t in, void *out); +static inline void cpu8_to_be_unaligned(uint8_t in, void *out); + +/* store into memory a cpu native endian number as a little endian number */ +static inline void cpu64_to_le_unaligned(uint64_t in, void *out); +static inline void cpu32_to_le_unaligned(uint32_t in, void *out); +static inline void cpu16_to_le_unaligned(uint16_t in, void *out); +static inline void cpu8_to_le_unaligned(uint8_t in, void *out); + +/* convert a big endian input into cpu native endian */ +static inline uint64_t be64_to_cpu(uint64_t in); +static inline uint32_t be32_to_cpu(uint32_t in); +static inline uint16_t be16_to_cpu(uint16_t in); +static inline uint8_t be8_to_cpu(uint8_t in); + +/* convert a cpu native endian input into big endian */ +static inline uint64_t cpu64_to_be(uint64_t in); +static inline uint32_t cpu32_to_be(uint32_t in); +static inline uint16_t cpu16_to_be(uint16_t in); +static inline uint8_t cpu8_to_be(uint8_t in); + +/* convert a little endian input into cpu native endian */ +static inline uint64_t le64_to_cpu(uint64_t in); +static inline uint32_t le32_to_cpu(uint32_t in); +static inline uint16_t le16_to_cpu(uint16_t in); +static inline uint8_t le8_to_cpu(uint8_t in); + +/* convert a cpu native endian input into little endian */ +static inline uint64_t cpu64_to_le(uint64_t in); +static inline uint32_t cpu32_to_le(uint32_t in); +static inline uint16_t cpu16_to_le(uint16_t in); +static inline uint8_t cpu8_to_le(uint8_t in); + +/* + * byte swapping + */ +static inline uint64_t i_bswap_64(uint64_t in) +{ + return ((in & 0xff00000000000000ULL) >> 56) | + ((in & 0x00ff000000000000ULL) >> 40) | + ((in & 0x0000ff0000000000ULL) >> 24) | + ((in & 0x000000ff00000000ULL) >> 8) | + ((in & 0x00000000ff000000ULL) << 8) | + ((in & 0x0000000000ff0000ULL) << 24) | + ((in & 0x000000000000ff00ULL) << 40) | + ((in & 0x00000000000000ffULL) << 56); +} + +static inline uint32_t i_bswap_32(uint32_t in) +{ + return ((in & 0xff000000) >> 24) | + ((in & 0x00ff0000) >> 8) | + ((in & 0x0000ff00) << 8) | + ((in & 0x000000ff) << 24); +} + +static inline uint16_t i_bswap_16(uint16_t in) +{ + return ((in & 0xff00) >> 8) | + ((in & 0x00ff) << 8); +} + +static inline uint8_t i_bswap_8(uint8_t in) +{ + return (in & 0xff); +} + +/* + * unaligned big-endian integer + */ +static inline uint64_t be64_to_cpu_unaligned(const void *in) +{ + const uint8_t *p = (const uint8_t *) in; + + return (((uint64_t) p[0] << 56) | + ((uint64_t) p[1] << 48) | + ((uint64_t) p[2] << 40) | + ((uint64_t) p[3] << 32) | + ((uint64_t) p[4] << 24) | + ((uint64_t) p[5] << 16) | + ((uint64_t) p[6] << 8) | + ((uint64_t) p[7])); +} + +static inline void cpu64_to_be_unaligned(uint64_t in, void *out) +{ + uint8_t *p = (uint8_t *) out; + + p[0] = (in >> 56) & 0xff; + p[1] = (in >> 48) & 0xff; + p[2] = (in >> 40) & 0xff; + p[3] = (in >> 32) & 0xff; + p[4] = (in >> 24) & 0xff; + p[5] = (in >> 16) & 0xff; + p[6] = (in >> 8) & 0xff; + p[7] = in & 0xff; +} + +static inline uint32_t be32_to_cpu_unaligned(const void *in) +{ + const uint8_t *p = (const uint8_t *) in; + + return (((uint32_t) p[0] << 24) | + ((uint32_t) p[1] << 16) | + ((uint32_t) p[2] << 8) | + ((uint32_t) p[3])); +} + +static inline void cpu32_to_be_unaligned(uint32_t in, void *out) +{ + uint8_t *p = (uint8_t *) out; + + p[0] = (in >> 24) & 0xff; + p[1] = (in >> 16) & 0xff; + p[2] = (in >> 8) & 0xff; + p[3] = in & 0xff; +} + +static inline uint16_t be16_to_cpu_unaligned(const void *in) +{ + const uint8_t *p = (const uint8_t *) in; + + return (((uint16_t) p[0] << 8) | + ((uint16_t) p[1])); +} + +static inline void cpu16_to_be_unaligned(uint16_t in, void *out) +{ + uint8_t *p = (uint8_t *) out; + + p[0] = (in >> 8) & 0xff; + p[1] = in & 0xff; +} + +static inline uint8_t be8_to_cpu_unaligned(const void *in) +{ + return *((const uint8_t *) in); +} + +static inline void cpu8_to_be_unaligned(uint8_t in, void *out) +{ + uint8_t *p = (uint8_t *) out; + + *p = in; +} + +/* + * unaligned little-endian & cpu-endian integers + */ +#define __GEN(size, bswap) \ +static inline uint##size##_t le##size##_to_cpu_unaligned(const void *in)\ +{ \ + uint##size##_t x = be##size##_to_cpu_unaligned(in); \ + /* we read a LE int as BE, so we always have to byte swap */ \ + return i_bswap_##size(x); \ +} \ +static inline void cpu##size##_to_le_unaligned(uint##size##_t in, \ + void *out) \ +{ \ + /* we'll be writing in BE, so we always have to byte swap */ \ + cpu##size##_to_be_unaligned(i_bswap_##size(in), out); \ +} \ +static inline uint##size##_t cpu##size##_to_cpu_unaligned(const void *in)\ +{ \ + uint##size##_t x = be##size##_to_cpu_unaligned(in); \ + return bswap; \ +} + +#ifdef WORDS_BIGENDIAN +#define GEN(size) __GEN(size, x) +#else +#define GEN(size) __GEN(size, i_bswap_##size(x)) +#endif + +GEN(64) +GEN(32) +GEN(16) +GEN(8) + +#undef __GEN +#undef GEN + +/* + * byte ordering + */ +#define ___GEN(from, size, to, bswap) \ +static inline uint##size##_t from##size##_to_##to(uint##size##_t x) \ +{ \ + return bswap; \ +} + +#ifdef WORDS_BIGENDIAN +#define __GEN(from, size, to, be, le) ___GEN(from, size, to, be) +#else +#define __GEN(from, size, to, be, le) ___GEN(from, size, to, le) +#endif + +#define GEN(size) \ + __GEN(be, size, cpu, x, i_bswap_##size(x)) \ + __GEN(cpu, size, be, x, i_bswap_##size(x)) \ + __GEN(le, size, cpu, i_bswap_##size(x), x) \ + __GEN(cpu, size, le, i_bswap_##size(x), x) + +GEN(64) +GEN(32) +GEN(16) +GEN(8) + +#undef ___GEN +#undef __GEN +#undef GEN + +#endif |