/******************************************/
/* integer.c 0.0.0 (1999-Oct-17-Sun)      */
/* Adam M. Costello <amc@cs.berkeley.edu> */
/******************************************/

/* Implementation of the interface defined by integer.c 0.0.*. */

/* This is ANSI C code. */


#include "integer.h"

#include <assert.h>


void encode_uint16(unsigned char *bytes, uint16 n)
{
  #if UINT16_MAX > 0xffff
  assert(n <= 0xffff);
  #endif

  bytes[1] = n & 0xff;
  bytes[0] = n >> 8;
}


void encode_uint32(unsigned char *bytes, uint32 n)
{
  #if UINT32_MAX > 0xffffffff
  assert(n <= 0xffffffff);
  #endif

  bytes[3] = n & 0xff;
  n >>= 8;
  bytes[2] = n & 0xff;
  n >>= 8;
  bytes[1] = n & 0xff;
  bytes[0] = n >> 8;
}


uint16 decode_uint16(const unsigned char *bytes)
{
  #if UCHAR_MAX > 0xff
  assert(bytes[0] <= 0xff);
  assert(bytes[1] <= 0xff);
  #endif

  return (uint16) bytes[0] << 8 | bytes[1];
}


uint32 decode_uint32(const unsigned char *bytes)
{
  #if UCHAR_MAX > 0xff
  assert(bytes[0] <= 0xff);
  assert(bytes[1] <= 0xff);
  assert(bytes[2] <= 0xff);
  assert(bytes[3] <= 0xff);
  #endif

  return (((uint32) bytes[0] << 8 | bytes[1]) << 8 | bytes[2]) << 8 | bytes[3];
}