Function readChunk_tEXt

dependency/densecrf/examples/lodepng.cpp:4302–4342

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 : 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,