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Diffstat (limited to 'compat/endian_enc.h')
| -rw-r--r-- | compat/endian_enc.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/compat/endian_enc.h b/compat/endian_enc.h new file mode 100644 index 000000000000..9e671b766607 --- /dev/null +++ b/compat/endian_enc.h @@ -0,0 +1,150 @@ +/*- + * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org> + * Copyright (c) 2005 Robert N. M. Watson + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * Derived from FreeBSD src/sys/sys/endian.h:1.6. + * $P4: //depot/projects/trustedbsd/openbsm/compat/endian_enc.h#1 $ + */ + +#ifndef _COMPAT_ENDIAN_ENC_H_ +#define _COMPAT_ENDIAN_ENC_H_ + +/* + * Some systems will have the uint/int types defined here already, others + * will need stdint.h. + */ +#ifdef HAVE_STDINT_H +#include <stdint.h> +#endif + +/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ + +static __inline uint16_t +be16dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return ((p[0] << 8) | p[1]); +} + +static __inline uint32_t +be32dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); +} + +static __inline uint64_t +be64dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); +} + +static __inline uint16_t +le16dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return ((p[1] << 8) | p[0]); +} + +static __inline uint32_t +le32dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); +} + +static __inline uint64_t +le64dec(const void *pp) +{ + unsigned char const *p = (unsigned char const *)pp; + + return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); +} + +static __inline void +be16enc(void *pp, uint16_t u) +{ + unsigned char *p = (unsigned char *)pp; + + p[0] = (u >> 8) & 0xff; + p[1] = u & 0xff; +} + +static __inline void +be32enc(void *pp, uint32_t u) +{ + unsigned char *p = (unsigned char *)pp; + + p[0] = (u >> 24) & 0xff; + p[1] = (u >> 16) & 0xff; + p[2] = (u >> 8) & 0xff; + p[3] = u & 0xff; +} + +static __inline void +be64enc(void *pp, uint64_t u) +{ + unsigned char *p = (unsigned char *)pp; + + be32enc(p, u >> 32); + be32enc(p + 4, u & 0xffffffff); +} + +static __inline void +le16enc(void *pp, uint16_t u) +{ + unsigned char *p = (unsigned char *)pp; + + p[0] = u & 0xff; + p[1] = (u >> 8) & 0xff; +} + +static __inline void +le32enc(void *pp, uint32_t u) +{ + unsigned char *p = (unsigned char *)pp; + + p[0] = u & 0xff; + p[1] = (u >> 8) & 0xff; + p[2] = (u >> 16) & 0xff; + p[3] = (u >> 24) & 0xff; +} + +static __inline void +le64enc(void *pp, uint64_t u) +{ + unsigned char *p = (unsigned char *)pp; + + le32enc(p, u & 0xffffffff); + le32enc(p + 4, u >> 32); +} + +#endif /* _COMPAT_ENDIAN_ENC_H_ */ |