Function readChunk_tEXt

samples/shared/lodepng.cpp:4201–4241

text chunk (tEXt)*/

/*text chunk (tEXt)*/
static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength)
{
  unsigned error = 0;
  char *key = 0, *str = 0;
  unsigned i;

  while(!error) /*not really a while loop, only used to break on error*/
  {
    unsigned length, string2_begin;

    length = 0;
    while(length < chunkLength && data[length] != 0) length++;
    /*even though it's not allowed by the standard, no error is thrown if
    there's no null termination char, if the text is empty*/
    if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/

    key = (char*)lodepng_malloc(length + 1);
    if(!key) CERROR_BREAK(error, 83); /*alloc fail*/

    key[length] = 0;
    for(i = 0; i < length; i++) key[i] = (char)data[i];

    string2_begin = length + 1; /*skip keyword null terminator*/

    length = chunkLength < string2_begin ? 0 : (unsigned int)chunkLength - string2_begin;
    str = (char*)lodepng_malloc(length + 1);
    if(!str) CERROR_BREAK(error, 83); /*alloc fail*/

    str[length] = 0;
    for(i = 0; i < length; i++) str[i] = (char)data[string2_begin + i];

    error = lodepng_add_text(info, key, str);

    break;
  }

  lodepng_free(key);
  lodepng_free(str);

  return error;
}

/*compressed text chunk (zTXt)*/
static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecompressSettings* zlibsettings,