133         png_error(png_ptr,  in png_create_read_struct_2()
150      case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;  in png_create_read_struct_2()
151      case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;  in png_create_read_struct_2()
152      default: png_error(png_ptr, "Unknown zlib error");  in png_create_read_struct_2()
219        png_error(png_ptr,  in png_read_init_2()
228        png_error(png_ptr,  in png_read_init_2()
304      case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;  in png_read_init_3()
305      case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;  in png_read_init_3()
306      default: png_error(png_ptr, "Unknown zlib error");  in png_read_init_3()
342             png_error(png_ptr, "Not a PNG file");  in png_read_info()
344             png_error(png_ptr, "PNG file corrupted by ASCII conversion");  in png_read_info()
443                png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
446                png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
456             png_error(png_ptr, "Missing IHDR before IDAT");  in png_read_info()
459             png_error(png_ptr, "Missing PLTE before IDAT");  in png_read_info()
696       png_error(png_ptr, "Invalid attempt to read row data");  in png_read_row()
716                png_error(png_ptr, "Not enough image data");  in png_read_row()
731             png_error(png_ptr, "Extra compressed data");  in png_read_row()
737          png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :  in png_read_row()
894       png_error(png_ptr,  in png_read_image()
1008                png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1021             png_error(png_ptr, "Too many IDAT's found");  in png_read_end()
1345       png_error(png_ptr,"Image is too high to process with png_read_png()");  in png_read_png()