endian.h

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#pragma once
 
#include <stdint.h>
 
/*
 * The build must be little-endian for the bodies below to be correct. GCC and
 * clang both define __BYTE_ORDER__ and __ORDER_LITTLE_ENDIAN__; if a toolchain
 * ever arrives that does not, the first branch fails loudly rather than letting
 * the second one assume anything.
 */
#if !defined(__BYTE_ORDER__) || !defined(__ORDER_LITTLE_ENDIAN__)
#error "endian.h: toolchain does not report __BYTE_ORDER__; cannot prove byte order"
#endif
 
static_assert(__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__,
              "esp-hosted framing assumes a little-endian host; see this file's @details");
 
/* The four function spellings below are fixed by the BSD / glibc <endian.h>
   contract that the vendored transport drivers are written against, so they
   cannot take this project's ra8_ prefix. clang-tidy's naming rule is
   suppressed across the block, following the ThreadX shim precedent in
   libs/ra8_wdt_supervisor and the sibling esp_log.h. */

static inline uint16_t htole16(uint16_t host_value)
{
  return host_value;
}

static inline uint16_t le16toh(uint16_t wire_value)
{
  return wire_value;
}

static inline uint32_t htole32(uint32_t host_value)
{
  return host_value;
}

static inline uint32_t le32toh(uint32_t wire_value)
{
  return wire_value;
}