MTBL_FIXED(3)MTBL_FIXED(3)NAME
mtbl_fixed - Fixed-width encoding and decoding of 32 and 64 bit integers
SYNOPSIS
#include <mtbl.h>
size_t mtbl_fixed_encode32(uint8_t *dst, uint32_t value);
size_t mtbl_fixed_encode64(uint8_t *dst, uint64_t value);
uint32_t mtbl_fixed_decode32(const uint8_t *ptr);
uint64_t mtbl_fixed_decode64(const uint8_t *ptr);
DESCRIPTION
mtbl_fixed_encode32() and mtbl_fixed_encode64() write the 32 or 64 bit quantity, respectively, in the argument value to the buffer in the
argument dst. The quantity will be written in little endian order, regardless of host architecture.
mtbl_fixed_decode32() and mtbl_fixed_decode64() read and return the 32 or 64 bit quantity, respectively, in the argument ptr. The quantity
will be read in little endian order, regardless of host architecture.
Bounds checking must be performed by the caller.
RETURN VALUE
mtbl_fixed_encode32() and mtbl_fixed_encode64() return the number of bytes written to the buffer. (4 or 8, respectively.)
mtbl_fixed_decode32() and mtbl_fixed_decode64() return the decoded quantity.
05/29/2012 MTBL_FIXED(3)
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swap_lw_bytes(9r)swap_lw_bytes(9r)NAME
swap_lw_bytes, swap_word_bytes, swap_words - General: Perform byte-swapping operations
SYNOPSIS
unsigned int swap_lw_bytes(
unsigned int buffer ); unsigned int swap_word_bytes(
unsigned int buffer ); unsigned int swap_words(
unsigned int buffer );
ARGUMENTS
Specifies a 32-bit (4 bytes) quantity.
DESCRIPTION
The swap_lw_bytes interface performs a longword byte swap. The swap_word_bytes interface performs a short word byte swap. The swap_words
interface performs a word byte swap. Many computer vendors support devices that use a big endian model of byte ordering. Because Digital
devices support the little endian model of byte ordering, there is a need for these byte-swapping interfaces. In addition, some buses (for
example, the VMEbus) can have specific or implied byte ordering that may require the use of these interfaces.
Given that a longword is equal to 4 bytes; a short word is equal to 2 bytes; and 1 byte is equal to 8 bits, these interfaces swap bytes as
follows: The swap_lw_bytes interface takes the 32-bit quantity specified by the buffer argument and swaps all 4 bytes. The swap_word_bytes
interface takes the 32-bit quantity specified by the buffer argument and swaps the individual bytes that make up each word of the 32-bit
quantity. The swap_words interface takes the 32-bit quantity specified by the buffer argument and swaps the two 16-bit words.
The following illustration compares the byte swapping performed by these interfaces.
31 0
+---+---+---+---+ Starting value: | a | b | c | d |
+---+---+---+---+
Long word byte swap
(swap_lw_bytes)
31 0
+---+---+---+---+ Ending value: | d | c | b | a |
+-------+---+---+
Short word byte swap
(swap_word_bytes)
31 0
+---+---+---+---+ Ending value: | b | a | d | c |
+---+---+---+---+
31 0
+---+---+---+---+ Starting value: | ab | cd |
+---+---+---+---+
Word byte swap
(swap_words)
31 0
+---+---+---+---+ Ending value: | cd | ab |
+---+---+---+---+
RETURN VALUES
Upon successful completion, these interfaces return the swapped bytes.
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