2717    png_uint_32 prefix_length;  in png_handle_iTXt()  local
2760    for (prefix_length=0;  in png_handle_iTXt()
2761       prefix_length < length && buffer[prefix_length] != 0;  in png_handle_iTXt()
2762       ++prefix_length)  in png_handle_iTXt()
2766    if (prefix_length > 79 || prefix_length < 1)  in png_handle_iTXt()
2773    else if (prefix_length + 5 > length)  in png_handle_iTXt()
2776    else if (buffer[prefix_length+1] == 0 ||  in png_handle_iTXt()
2777       (buffer[prefix_length+1] == 1 &&  in png_handle_iTXt()
2778       buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE))  in png_handle_iTXt()
2780       int compressed = buffer[prefix_length+1] != 0;  in png_handle_iTXt()
2785       prefix_length += 3;  in png_handle_iTXt()
2786       language_offset = prefix_length;  in png_handle_iTXt()
2788       for (; prefix_length < length && buffer[prefix_length] != 0;  in png_handle_iTXt()
2789          ++prefix_length)  in png_handle_iTXt()
2793       translated_keyword_offset = ++prefix_length;  in png_handle_iTXt()
2795       for (; prefix_length < length && buffer[prefix_length] != 0;  in png_handle_iTXt()
2796          ++prefix_length)  in png_handle_iTXt()
2804       ++prefix_length;  in png_handle_iTXt()
2806       if (compressed == 0 && prefix_length <= length)  in png_handle_iTXt()
2807          uncompressed_length = length - prefix_length;  in png_handle_iTXt()
2809       else if (compressed != 0 && prefix_length < length)  in png_handle_iTXt()
2817          if (png_decompress_chunk(png_ptr, length, prefix_length,  in png_handle_iTXt()
2832          buffer[uncompressed_length+prefix_length] = 0;  in png_handle_iTXt()
2843          text.text = (png_charp)buffer + prefix_length;  in png_handle_iTXt()