Question

Linux中的C库中是否存在函数* dec / * enc（例如be64enc）？它们确实存在于FreeBSD中，但在Linux中我只能找到hto * / * toh函数，这些函数恐怕具有完全相同的功能。

提前致谢。

Answer 1

他们没有：

$ uname
Linux
$ man be64enc
No manual entry for be64enc

快速谷歌搜索确认了这一点，没有Linux条目。

我找不到那些功能应该做什么。这是该主题的唯一手册页（BSD），并没有特别的帮助：

BYTEORDER(9)              BSD Kernel Developer's Manual              BYTEORDER(9)

NAME
     bswap16, bswap32, bswap64, be16toh, be32toh, be64toh, htobe16, htobe32, htobe64, htole16,
     htole32, htole64, le16toh, le32toh, le64toh, be16enc, be16dec, be32enc, be32dec, be64enc,
     be64dec, le16enc, le16dec, le32enc, le32dec, le64enc, le64dec -- byte order operations

SYNOPSIS
     #include <sys/endian.h>

     uint16_t
     bswap16(uint16_t int16);

     uint32_t
     bswap32(uint32_t int32);

     uint64_t
     bswap64(uint64_t int64);

     uint16_t
     be16toh(uint16_t big16);

     uint32_t
     be32toh(uint32_t big32);

     uint64_t
     be64toh(uint64_t big64);

     uint16_t
     htobe16(uint16_t host16);

     uint32_t
     htobe32(uint32_t host32);

     uint64_t
     htobe64(uint64_t host64);

     uint16_t
     htole16(uint16_t host16);

     uint32_t
     htole32(uint32_t host32);

     uint64_t
     htole64(uint64_t host64);

     uint16_t
     le16toh(uint16_t little16);

     uint32_t
     le32toh(uint32_t little32);

     uint64_t
     le64toh(uint64_t little64);

     uint16_t
     be16dec(const void *);

     uint32_t
     be32dec(const void *);

     uint64_t
     be64dec(const void *);

     uint16_t
     le16dec(const void *);

     uint32_t
     le32dec(const void *);

     uint64_t
     le64dec(const void *);

     void
     be16enc(void *, uint16_t);

     void
     be32enc(void *, uint32_t);

     void
     be64enc(void *, uint64_t);

     void
     le16enc(void *, uint16_t);

     void
     le32enc(void *, uint32_t);

     void
     le64enc(void *, uint64_t);

DESCRIPTION
     The bswap16(), bswap32(), and bswap64() functions return a byte order swapped integer.  On
     big endian systems, the number is converted to little endian byte order.  On little endian
     systems, the number is converted to big endian byte order.

     The be16toh(), be32toh(), and be64toh() functions return a big endian byte ordered integer
     converted to the system's native byte order.  The return value will be the same as the argu-
     ment on big endian systems.

     The le16toh(), le32toh(), and le64toh() functions return a little endian byte ordered inte-
     ger converted to the system's native byte order.  The return value will be the same as the
     argument on little endian systems.

     The htobe16(), htobe32(), and htobe64() functions return a integer in the system's native
     byte order converted to big endian byte order.  The return value will be the same as the
     argument on big endian systems.

     The htole16(), htole32(), and htole64() functions return a integer in the system's native
     byte order converted to little endian byte order.  The return value will be the same as the
     argument on little endian systems.

     The be16enc(), be16dec(), be32enc(), be32dec(), be64enc(), be64dec(), le16enc(), le16dec(),
     le32enc(), le32dec(), le64enc(), and le64dec() functions encode and decode integers to/from
     byte strings on any alignment in big/little endian format.

SEE ALSO
     byteorder(3)

HISTORY
     The hto*() and toh*() functions first appeared in FreeBSD 5.0, and were originally developed
     by the NetBSD project.

     The encode/decode functions first appeared in FreeBSD 5.1.

BSD                   April 29, 2002                      BSD

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be64enc和Linux中FreeBSD的其他dec / enc等效函数？

1 个答案: