151          png_error(png_ptr,  in png_create_read_struct_2()
168          case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error");  in png_create_read_struct_2()
170          case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");  in png_create_read_struct_2()
172          default: png_error(png_ptr, "Unknown zlib error");  in png_create_read_struct_2()
243       png_error(png_ptr,  in png_read_init_2()
253       png_error(png_ptr,  in png_read_init_2()
332       case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;  in png_read_init_3()
333       case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");  in png_read_init_3()
335       default: png_error(png_ptr, "Unknown zlib error");  in png_read_init_3()
374             png_error(png_ptr, "Not a PNG file");  in png_read_info()
376             png_error(png_ptr, "PNG file corrupted by ASCII conversion");  in png_read_info()
466                png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
469                png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
479             png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
482             png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
727       png_error(png_ptr, "Invalid attempt to read row data");  in png_read_row()
743                png_error(png_ptr, "Not enough image data");  in png_read_row()
758             png_error(png_ptr, "Extra compressed data");  in png_read_row()
764          png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :  in png_read_row()
925       png_error(png_ptr,  in png_read_image()
1032                png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1045             png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1377       png_error(png_ptr, "Image is too high to process with png_read_png()");  in png_read_png()