Lines Matching refs:signature
115 /* Read and check the PNG file signature */
121 /* Exit if the user application does not expect a signature. */
132 /* The signature must be serialized in a single I/O call. */
133 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
136 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
139 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
