xt_utils.h

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#ifndef __XT_UTILS_H__
#define __XT_UTILS_H__

 
/* ==================== [Includes] ========================================== */
 
#include <string.h>
#include <stdint.h>
 
#include "xt_bit.h"
#include "xt_crc.h"
#include "xt_error.h"
#include "xt_list.h"
#include "xt_macro.h"
#include "xt_rb.h"
 
#ifdef __cplusplus
extern "C" {
#endif

 
/* ==================== [Defines] =========================================== */
 
/* ==================== [Typedefs] ========================================== */
 
/* ==================== [Global Prototypes] ================================= */
 
static inline uint32_t xt_log2_u32(uint32_t n)
{
    uint32_t result = 0;
/* *INDENT-OFF* */
    if (n & 0xffff0000) { result += 16; n >>= 16; }
    if (n & 0x0000ff00) { result +=  8; n >>=  8; }
    if (n & 0x000000f0) { result +=  4; n >>=  4; }
    if (n & 0x0000000c) { result +=  2; n >>=  2; }
    if (n & 0x00000002) { result +=  1; /* n >>=  1; */ }
/* *INDENT-ON* */ 
    return result;
}
 
static inline uint16_t xt_bswap16(uint16_t val16)
{
    return ((val16 << 8) & 0xFF00) | ((val16 >> 8) & 0x00FF);
}
 
static inline uint32_t xt_bswap32(uint32_t val32)
{
    return ((val32 & 0x000000FF) << 24) |
           ((val32 & 0x0000FF00) << 8)  |
           ((val32 & 0x00FF0000) >> 8)  |
           ((val32 & 0xFF000000) >> 24);
}
 
static inline uint16_t xt_read16p(const void *ptr16)
{
    return (((const uint8_t *)ptr16)[0]) | (((const uint8_t *)ptr16)[1] << 8);
}
 
static inline uint32_t xt_read32p(const void *ptr32)
{
    const uint8_t *p = (const uint8_t *)ptr32;
    return (uint32_t)p[0]       |
           (uint32_t)p[1] << 8  |
           (uint32_t)p[2] << 16 |
           (uint32_t)p[3] << 24;
}
 
/* ==================== [Macros] ============================================ */
  /* xt_utils */
 
#ifdef __cplusplus
} /* extern "C" */
#endif
  /* xt_std */
 
#endif /* __XT_UTILS_H__ */