RTL281_LTE/fonts/unicode.c

#include "unicode.h"
#include "GB2312UnicodeTable.h"
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

/*
  MIN_CODE = $A1A1;
  MAX_CODE = $F7FE;
*/
#define GB2312_CODE_ZONE_MIN  0xA1
#define GB2312_CODE_ZONE_MAX  0xF7
#define GB2312_CODE_POS_MIN   0xA1
#define GB2312_CODE_POS_MAX   0xFE

static uint16_t
GB2312_to_Unicode(uint16_t c)
{
  uint8_t zone, pos;
  uint32_t offset;
  uint16_t retval;

  zone = c >> 8;
  pos = c & 0xFF;

  if ((zone > GB2312_CODE_ZONE_MAX) ||
      (zone < GB2312_CODE_ZONE_MIN) ||
      (pos  > GB2312_CODE_POS_MAX) ||
      (pos  < GB2312_CODE_POS_MIN))
  {
    return c;
  }
  offset = (zone - GB2312_CODE_ZONE_MIN) * (GB2312_CODE_POS_MAX - GB2312_CODE_POS_MIN + 1) +
           (pos - GB2312_CODE_POS_MIN);
	retval=GB2312_UNICODE_MAP[offset];//offset*2
  return retval;
}

uint16_t
Ansi_to_Unicode(uint16_t *dest, uint16_t size, const uint8_t *src, uint16_t length) //GBK_Unicode
{
  uint16_t count = 0;
	uint16_t temp,tmp;

  while((count < size) && length){
    if ((*src > 0x7F) && (length > 1)){
			dest[count] = GB2312_to_Unicode(((uint16_t)src[0] << 8) | src[1]);
      src += 2;
      length -= 2;
    }
    else
    {
      dest[count] = *src;
      src++;
      length--;
    }
    ++count;
  }

  return count;
}