radio/src/gui/480x272/rle.cpp

   1 #include "rle.h"
   2 #include "debug.h"
   3
   4 #include <string.h>
   5
   6 int rle_decode_8bit(unsigned char* dest, unsigned int dest_size, const unsigned char* src)
   7 {
   8   //unsigned char count = 0;
   9   unsigned char prev_byte = 0;
  10   bool prev_byte_valid = false;
  11
  12   const unsigned char* dest_end = dest + dest_size;
  13   unsigned char* d = dest;
  14
  15   while(d < dest_end) {
  16
  17     *d++ = *src;
  18     if (prev_byte_valid && (*src == prev_byte)) {
  19
  20       src++;
  21
  22       if (d + *src > dest + dest_size) {
  23         TRACE("rle_decode_8bit: destination overflow!\n");
  24         return -1;
  25       }
  26
  27       memset(d, prev_byte, *src);
  28       d += *src++;
  29       prev_byte_valid = false;
  30     }
  31     else {
  32       prev_byte = *src++;
  33       prev_byte_valid = true;
  34     }
  35   }
  36
  37   return d - dest;
  38 }