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c-lib: in endian.c, move union types outside functions

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This commit is contained in:
Hugues Delorme 2013-02-05 12:19:24 +01:00
parent 903d98d565
commit dc832d3f81
1 changed files with 44 additions and 33 deletions
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77
src/c/endian.c
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@ -2,19 +2,43 @@
#include <string.h>
typedef union
{
uint32_t integer;
uint8_t bytes[4];
} _internal_foug_int_bytes_32_convert_t;
typedef union
{
uint32_t as_integer;
foug_real32_t as_float;
} _internal_foug_int_real_32_convert_t;
static foug_real32_t convert_real32(uint32_t val)
{
_internal_foug_int_real_32_convert_t conv;
conv.as_integer = val;
return conv.as_float;
}
static uint32_t convert_uint32(foug_real32_t val)
{
_internal_foug_int_real_32_convert_t conv;
conv.as_float = val;
return conv.as_integer;
}
/*! Endianness (byte order) of the host's CPU architecture */
foug_endianness_t foug_host_endianness()
{
union {
uint32_t integer;
uint8_t bytes[4];
} u;
_internal_foug_int_bytes_32_convert_t conv;
u.integer = 0x01020408;
if (u.bytes[0] == 0x08 && u.bytes[3] == 0x01)
conv.integer = 0x01020408;
if (conv.bytes[0] == 0x08 && conv.bytes[3] == 0x01)
return FOUG_LITTLE_ENDIAN;
else if (u.bytes[0] == 0x01 && u.bytes[3] == 0x08)
else if (conv.bytes[0] == 0x01 && conv.bytes[3] == 0x08)
return FOUG_BIG_ENDIAN;
else if (u.bytes[1] == 0x08 && u.bytes[2] == 0x01)
else if (conv.bytes[1] == 0x08 && conv.bytes[2] == 0x01)
return FOUG_MIDDLE_ENDIAN;
else
return FOUG_OTHER_ENDIAN;
@ -30,6 +54,7 @@ uint16_t foug_uint16_noswap(uint16_t val)
return val;
}
/*! Read a 16bit integer from memory-location \p bytes (little-endian byte order) */
uint16_t foug_decode_uint16_le(const uint8_t* bytes)
{
/* |0 |1 | */
@ -37,6 +62,7 @@ uint16_t foug_decode_uint16_le(const uint8_t* bytes)
return (bytes[1] << 8) | bytes[0];
}
/*! Read a 16bit integer from memory-location \p bytes (big-endian byte order) */
uint16_t foug_decode_uint16_be(const uint8_t* bytes)
{
/* |0 |1 | */
@ -44,6 +70,7 @@ uint16_t foug_decode_uint16_be(const uint8_t* bytes)
return (bytes[0] << 8) | bytes[1];
}
/*! Write 16bit integer \p val to the memory location at \p bytes in little-endian byte order */
void foug_encode_uint16_le(uint16_t val, uint8_t* bytes)
{
bytes[0] = val & 0xFF;
@ -64,24 +91,28 @@ uint32_t foug_uint32_noswap(uint32_t val)
return val;
}
/*! Read a 32bit integer from memory-location \p bytes (little-endian byte order) */
uint32_t foug_decode_uint32_le(const uint8_t* bytes)
{
/* |DD|CC|BB|AA| -> 0xAABBCCDD */
return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
}
/*! Read a 32bit integer from memory-location \p bytes (mixed-endian byte order) */
uint32_t foug_decode_uint32_me(const uint8_t* bytes)
{
/* |DD|CC|BB|AA| -> 0xCCDDAABB */
return (bytes[0] >> 8) | (bytes[2] << 8) | (bytes[3] << 8) | (bytes[8] << 8);
return (bytes[0] >> 8) | (bytes[2] << 8) | (bytes[3] << 8) | (bytes[1] << 8);
}
/*! Read a 32bit integer from memory-location \p bytes (big-endian byte order) */
uint32_t foug_decode_uint32_be(const uint8_t* bytes)
{
/* |DD|CC|BB|AA| -> 0xDDCCBBAA */
return bytes[3] | (bytes[2] << 8) | (bytes[1] << 16) | (bytes[0] << 24);
}
/*! Write 32bit integer \p val to the memory location at \p bytes in little-endian byte order */
void foug_encode_uint32_le(uint32_t val, uint8_t* bytes)
{
bytes[0] = val & 0xFF;
@ -90,45 +121,25 @@ void foug_encode_uint32_le(uint32_t val, uint8_t* bytes)
bytes[3] = (val >> 24) & 0xFF;
}
static foug_real32_t convert_real32(uint32_t val)
{
union
{
uint32_t as_integer;
foug_real32_t as_float;
} u;
u.as_integer = val;
return u.as_float;
}
static uint32_t convert_uint32(foug_real32_t val)
{
union
{
uint32_t as_integer;
foug_real32_t as_float;
} u;
u.as_float = val;
return u.as_integer;
}
/*! Read a 32bit real from memory-location \p bytes (little-endian byte order) */
foug_real32_t foug_decode_real32_le(const uint8_t* bytes)
{
return convert_real32(foug_decode_uint32_le(bytes));
}
/*! Read a 32bit real from memory-location \p bytes (mixed-endian byte order) */
foug_real32_t foug_decode_real32_me(const uint8_t* bytes)
{
return convert_real32(foug_decode_uint32_me(bytes));
}
/*! Read a 32bit real from memory-location \p bytes (big-endian byte order) */
foug_real32_t foug_decode_real32_be(const uint8_t* bytes)
{
return convert_real32(foug_decode_uint32_be(bytes));
}
/*! Write 32bit real \p val to the memory location at \p bytes in little-endian byte order */
void foug_encode_real32_le(foug_real32_t val, uint8_t* bytes)
{
foug_encode_uint32_le(convert_uint32(val), bytes);