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()
247       png_error(png_ptr,  in png_read_init_2()
257       png_error(png_ptr,  in png_read_init_2()
336       case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;  in png_read_init_3()
337       case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error");  in png_read_init_3()
339       default: png_error(png_ptr, "Unknown zlib error");  in png_read_init_3()
378             png_error(png_ptr, "Not a PNG file");  in png_read_info()
380             png_error(png_ptr, "PNG file corrupted by ASCII conversion");  in png_read_info()
470                png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
473                png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
483             png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
486             png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
736       png_error(png_ptr, "Invalid attempt to read row data");  in png_read_row()
759                png_error(png_ptr, "Not enough image data");  in png_read_row()
774             png_error(png_ptr, "Extra compressed data");  in png_read_row()
783                png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :  in png_read_row()
788             png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :  in png_read_row()
1087       png_error(png_ptr,  in png_read_image()
1194                png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1207             png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1557       png_error(png_ptr, "Image is too high to process with png_read_png()");  in png_read_png()