69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
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/* Warning : this header has no multi-inclusion guard. It must be included only once in the
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* translation unit of use. The reason is that all functions defined here are meant to
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* be inlined for performance purpose
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*/
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#include "../global.h"
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/*! Read a 16bit integer from memory-location \p bytes (little-endian byte order) */
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FOUG_INLINE static uint16_t foug_decode_uint16_le(const uint8_t* bytes)
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{
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/* |0 |1 | */
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/* |BB|AA| -> 0xAABB */
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return (bytes[1] << 8) | bytes[0];
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}
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/*! Read a 16bit integer from memory-location \p bytes (big-endian byte order) */
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FOUG_INLINE static uint16_t foug_decode_uint16_be(const uint8_t* bytes)
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{
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/* |0 |1 | */
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/* |AA|BB| -> 0xAABB */
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return (bytes[0] << 8) | bytes[1];
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}
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/*! Write 16bit integer \p val to the memory location at \p bytes in little-endian byte order */
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FOUG_INLINE static void foug_encode_uint16_le(uint16_t val, uint8_t* bytes)
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{
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bytes[0] = val & 0xFF;
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bytes[1] = (val >> 8) & 0xFF;
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}
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/*! Read a 32bit integer from memory-location \p bytes (little-endian byte order) */
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FOUG_INLINE static uint32_t foug_decode_uint32_le(const uint8_t* bytes)
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{
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/* |DD|CC|BB|AA| -> 0xAABBCCDD */
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return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
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}
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/*! Read a 32bit integer from memory-location \p bytes (mixed-endian byte order) */
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FOUG_INLINE static uint32_t foug_decode_uint32_me(const uint8_t* bytes)
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{
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/* |DD|CC|BB|AA| -> 0xCCDDAABB */
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return (bytes[0] >> 8) | (bytes[2] << 8) | (bytes[3] << 8) | (bytes[1] << 8);
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}
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/*! Read a 32bit integer from memory-location \p bytes (big-endian byte order) */
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FOUG_INLINE static uint32_t foug_decode_uint32_be(const uint8_t* bytes)
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{
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/* |DD|CC|BB|AA| -> 0xDDCCBBAA */
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return bytes[3] | (bytes[2] << 8) | (bytes[1] << 16) | (bytes[0] << 24);
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}
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/*! Write 32bit integer \p val to the memory location at \p bytes in little-endian byte order */
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FOUG_INLINE static void foug_encode_uint32_le(uint32_t val, uint8_t* bytes)
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{
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bytes[0] = val & 0xFF;
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bytes[1] = (val >> 8) & 0xFF;
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bytes[2] = (val >> 16) & 0xFF;
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bytes[3] = (val >> 24) & 0xFF;
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}
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/*! Write 32bit integer \p val to the memory location at \p bytes in big-endian byte order */
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FOUG_INLINE static void foug_encode_uint32_be(uint32_t val, uint8_t* bytes)
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{
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bytes[0] = (val >> 24) & 0xFF;
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bytes[1] = (val >> 16) & 0xFF;
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bytes[2] = (val >> 8) & 0xFF;
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bytes[3] = val & 0xFF;
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}
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