Description
These macros provide a portable way to determine the host byte order
and to convert values between different byte orders.
The byte order is the order in which bytes are stored to create larger
data types such as the gint and glong values.
The host byte order is the byte order used on the current machine.
Some processors store the most significant bytes (i.e. the bytes that
hold the largest part of the value) first. These are known as big-endian
processors. Other processors (notably the x86 family) store the most
significant byte last. These are known as little-endian processors.
Finally, to complicate matters, some other processors store the bytes in
a rather curious order known as PDP-endian. For a 4-byte word, the 3rd
most significant byte is stored first, then the 4th, then the 1st and
finally the 2nd.
Obviously there is a problem when these different processors communicate
with each other, for example over networks or by using binary file formats.
This is where these macros come in. They are typically used to convert
values into a byte order which has been agreed on for use when
communicating between different processors. The Internet uses what is
known as 'network byte order' as the standard byte order (which is in
fact the big-endian byte order).
Note that the byte order conversion macros may evaluate their arguments
multiple times, thus you should not use them with arguments which have
side-effects.
Functions
g_htonl()
#define g_htonl(val)
Converts a 32-bit integer value from host to network byte order.
Returns
val
converted to network byte order
g_htons()
#define g_htons(val)
Converts a 16-bit integer value from host to network byte order.
Returns
val
converted to network byte order
g_ntohl()
#define g_ntohl(val)
Converts a 32-bit integer value from network to host byte order.
Returns
val
converted to host byte order.
g_ntohs()
#define g_ntohs(val)
Converts a 16-bit integer value from network to host byte order.
Returns
val
converted to host byte order
GINT_FROM_BE()
#define GINT_FROM_BE(val) (GINT_TO_BE (val))
Converts a gint value from big-endian to host byte order.
Returns
val
converted to host byte order
GINT_FROM_LE()
#define GINT_FROM_LE(val) (GINT_TO_LE (val))
Converts a gint value from little-endian to host byte order.
Returns
val
converted to host byte order
GINT_TO_BE()
#define GINT_TO_BE(val) ((gint) GINT32_TO_BE (val))
Converts a gint value from host byte order to big-endian.
Returns
val
converted to big-endian byte order
GINT_TO_LE()
#define GINT_TO_LE(val) ((gint) GINT32_TO_LE (val))
Converts a gint value from host byte order to little-endian.
Returns
val
converted to little-endian byte order
GUINT_FROM_BE()
#define GUINT_FROM_BE(val) (GUINT_TO_BE (val))
Converts a guint value from big-endian to host byte order.
Returns
val
converted to host byte order
GUINT_FROM_LE()
#define GUINT_FROM_LE(val) (GUINT_TO_LE (val))
Converts a guint value from little-endian to host byte order.
Returns
val
converted to host byte order
GUINT_TO_BE()
#define GUINT_TO_BE(val) ((guint) GUINT32_TO_BE (val))
Converts a guint value from host byte order to big-endian.
Returns
val
converted to big-endian byte order
GUINT_TO_LE()
#define GUINT_TO_LE(val) ((guint) GUINT32_TO_LE (val))
Converts a guint value from host byte order to little-endian.
Returns
val
converted to little-endian byte order.
GLONG_FROM_BE()
#define GLONG_FROM_BE(val) (GLONG_TO_BE (val))
Converts a glong value from big-endian to the host byte order.
Returns
val
converted to host byte order
GLONG_FROM_LE()
#define GLONG_FROM_LE(val) (GLONG_TO_LE (val))
Converts a glong value from little-endian to host byte order.
Returns
val
converted to host byte order
GLONG_TO_BE()
#define GLONG_TO_BE(val) ((glong) GINT64_TO_BE (val))
Converts a glong value from host byte order to big-endian.
Returns
val
converted to big-endian byte order
GLONG_TO_LE()
#define GLONG_TO_LE(val) ((glong) GINT64_TO_LE (val))
Converts a glong value from host byte order to little-endian.
Returns
val
converted to little-endian
GULONG_FROM_BE()
#define GULONG_FROM_BE(val) (GULONG_TO_BE (val))
Converts a gulong value from big-endian to host byte order.
Returns
val
converted to host byte order
GULONG_FROM_LE()
#define GULONG_FROM_LE(val) (GULONG_TO_LE (val))
Converts a gulong value from little-endian to host byte order.
Returns
val
converted to host byte order
GULONG_TO_BE()
#define GULONG_TO_BE(val) ((gulong) GUINT64_TO_BE (val))
Converts a gulong value from host byte order to big-endian.
Returns
val
converted to big-endian
GULONG_TO_LE()
#define GULONG_TO_LE(val) ((gulong) GUINT64_TO_LE (val))
Converts a gulong value from host byte order to little-endian.
Returns
val
converted to little-endian
GSIZE_FROM_BE()
#define GSIZE_FROM_BE(val) (GSIZE_TO_BE (val))
Converts a gsize value from big-endian to the host byte order.
Returns
val
converted to host byte order
GSIZE_FROM_LE()
#define GSIZE_FROM_LE(val) (GSIZE_TO_LE (val))
Converts a gsize value from little-endian to host byte order.
Returns
val
converted to host byte order
GSIZE_TO_BE()
#define GSIZE_TO_BE(val) ((gsize) GUINT64_TO_BE (val))
Converts a gsize value from host byte order to big-endian.
Returns
val
converted to big-endian byte order
GSIZE_TO_LE()
#define GSIZE_TO_LE(val) ((gsize) GUINT64_TO_LE (val))
Converts a gsize value from host byte order to little-endian.
Returns
val
converted to little-endian
GSSIZE_FROM_BE()
#define GSSIZE_FROM_BE(val) (GSSIZE_TO_BE (val))
Converts a gssize value from big-endian to host byte order.
Returns
val
converted to host byte order
GSSIZE_FROM_LE()
#define GSSIZE_FROM_LE(val) (GSSIZE_TO_LE (val))
Converts a gssize value from little-endian to host byte order.
Returns
val
converted to host byte order
GSSIZE_TO_BE()
#define GSSIZE_TO_BE(val) ((gssize) GINT64_TO_BE (val))
Converts a gssize value from host byte order to big-endian.
Returns
val
converted to big-endian
GSSIZE_TO_LE()
#define GSSIZE_TO_LE(val) ((gssize) GINT64_TO_LE (val))
Converts a gssize value from host byte order to little-endian.
Returns
val
converted to little-endian
GINT16_FROM_BE()
#define GINT16_FROM_BE(val) (GINT16_TO_BE (val))
Converts a gint16 value from big-endian to host byte order.
Returns
val
converted to host byte order
GINT16_FROM_LE()
#define GINT16_FROM_LE(val) (GINT16_TO_LE (val))
Converts a gint16 value from little-endian to host byte order.
Returns
val
converted to host byte order
GINT16_TO_BE()
#define GINT16_TO_BE(val) ((gint16) GUINT16_SWAP_LE_BE (val))
Converts a gint16 value from host byte order to big-endian.
Returns
val
converted to big-endian
GINT16_TO_LE()
#define GINT16_TO_LE(val) ((gint16) (val))
Converts a gint16 value from host byte order to little-endian.
Returns
val
converted to little-endian
GUINT16_FROM_BE()
#define GUINT16_FROM_BE(val) (GUINT16_TO_BE (val))
Converts a guint16 value from big-endian to host byte order.
Returns
val
converted to host byte order
GUINT16_FROM_LE()
#define GUINT16_FROM_LE(val) (GUINT16_TO_LE (val))
Converts a guint16 value from little-endian to host byte order.
Returns
val
converted to host byte order
GUINT16_TO_BE()
#define GUINT16_TO_BE(val) (GUINT16_SWAP_LE_BE (val))
Converts a guint16 value from host byte order to big-endian.
Returns
val
converted to big-endian
GUINT16_TO_LE()
#define GUINT16_TO_LE(val) ((guint16) (val))
Converts a guint16 value from host byte order to little-endian.
Returns
val
converted to little-endian
GINT32_FROM_BE()
#define GINT32_FROM_BE(val) (GINT32_TO_BE (val))
Converts a gint32 value from big-endian to host byte order.
Returns
val
converted to host byte order
GINT32_FROM_LE()
#define GINT32_FROM_LE(val) (GINT32_TO_LE (val))
Converts a gint32 value from little-endian to host byte order.
Returns
val
converted to host byte order
GINT32_TO_BE()
#define GINT32_TO_BE(val) ((gint32) GUINT32_SWAP_LE_BE (val))
Converts a gint32 value from host byte order to big-endian.
Returns
val
converted to big-endian
GINT32_TO_LE()
#define GINT32_TO_LE(val) ((gint32) (val))
Converts a gint32 value from host byte order to little-endian.
Returns
val
converted to little-endian
GUINT32_FROM_BE()
#define GUINT32_FROM_BE(val) (GUINT32_TO_BE (val))
Converts a guint32 value from big-endian to host byte order.
Returns
val
converted to host byte order
GUINT32_FROM_LE()
#define GUINT32_FROM_LE(val) (GUINT32_TO_LE (val))
Converts a guint32 value from little-endian to host byte order.
Returns
val
converted to host byte order
GUINT32_TO_BE()
#define GUINT32_TO_BE(val) (GUINT32_SWAP_LE_BE (val))
Converts a guint32 value from host byte order to big-endian.
Returns
val
converted to big-endian
GUINT32_TO_LE()
#define GUINT32_TO_LE(val) ((guint32) (val))
Converts a guint32 value from host byte order to little-endian.
Returns
val
converted to little-endian
GINT64_FROM_BE()
#define GINT64_FROM_BE(val) (GINT64_TO_BE (val))
Converts a gint64 value from big-endian to host byte order.
Returns
val
converted to host byte order
GINT64_FROM_LE()
#define GINT64_FROM_LE(val) (GINT64_TO_LE (val))
Converts a gint64 value from little-endian to host byte order.
Returns
val
converted to host byte order
GINT64_TO_BE()
#define GINT64_TO_BE(val) ((gint64) GUINT64_SWAP_LE_BE (val))
Converts a gint64 value from host byte order to big-endian.
Returns
val
converted to big-endian
GINT64_TO_LE()
#define GINT64_TO_LE(val) ((gint64) (val))
Converts a gint64 value from host byte order to little-endian.
Returns
val
converted to little-endian
GUINT64_FROM_BE()
#define GUINT64_FROM_BE(val) (GUINT64_TO_BE (val))
Converts a guint64 value from big-endian to host byte order.
Returns
val
converted to host byte order
GUINT64_FROM_LE()
#define GUINT64_FROM_LE(val) (GUINT64_TO_LE (val))
Converts a guint64 value from little-endian to host byte order.
Returns
val
converted to host byte order
GUINT64_TO_BE()
#define GUINT64_TO_BE(val) (GUINT64_SWAP_LE_BE (val))
Converts a guint64 value from host byte order to big-endian.
Returns
val
converted to big-endian
GUINT64_TO_LE()
#define GUINT64_TO_LE(val) ((guint64) (val))
Converts a guint64 value from host byte order to little-endian.
Returns
val
converted to little-endian
GUINT16_SWAP_BE_PDP()
#define GUINT16_SWAP_BE_PDP(val) (GUINT16_SWAP_LE_BE (val))
Converts a guint16 value between big-endian and pdp-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT16_SWAP_LE_BE()
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA32 (val))
Converts a guint16 value between little-endian and big-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT16_SWAP_LE_PDP()
#define GUINT16_SWAP_LE_PDP(val) ((guint16) (val))
Converts a guint16 value between little-endian and pdp-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT32_SWAP_BE_PDP()
#define GUINT32_SWAP_BE_PDP(val)
Converts a guint32 value between big-endian and pdp-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT32_SWAP_LE_BE()
# define GUINT32_SWAP_LE_BE(val) ((guint32) __builtin_bswap32 ((guint32) (val)))
Converts a guint32 value between little-endian and big-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT32_SWAP_LE_PDP()
#define GUINT32_SWAP_LE_PDP(val)
Converts a guint32 value between little-endian and pdp-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order
GUINT64_SWAP_LE_BE()
# define GUINT64_SWAP_LE_BE(val) ((guint64) __builtin_bswap64 ((guint64) (val)))
Converts a guint64 value between little-endian and big-endian byte order.
The conversion is symmetric so it can be used both ways.
Returns
val
converted to the opposite byte order