Method and system to recognize encoding type in document processing language

An apparatus for determining whether page description commands are encoded in a binary or textual formal, comprising:

• means for parsing said commands under the encoding rules of ISO/IEC 8825;
• binary determining means for determining if any of three beginning tags of said commands contain an object identifier encoded with four octets of hex values "28 CF 44 00";
• means for parsing the document in binary if the binary determining means determines that the first three tags of said commands contain an object identifier encoded with four octets of hex values "28 CF44 00";
• clear text determining means for determining if a beginning of the commands contains bytes representing zero or more spaces, carriage returns, line feeds, or tabs followed by pattern "<!DOCTYPE" without regard to capitalization, followed by bytes representing one or more spaces, carriage returns, line feeds, or tabs, followed by characters including SPDL without regard to capitalization;
• means for parsing the commands in clear text if the clear text determining means determines that the file has been encoded in clear text.

A method for determining whether page description language commands are encoded in a binary or textual format, comprising the steps:

• processing said commands under the encoding of ISO/IEC 8825;
• determining if beginning tags of said commands contain an object identifier indicating that said command are encoded under a binary SPDL format, and if said commands are determined to be encoded under the binary SPDL format, terminating processing of said method;
• returning to a beginning of the commands, processing the commands under a textual encoding format and reading first and subsequent bytes of the commands until said bytes do not contain a byte selected from the group of bytes representing a Space, CR, LF, or Tab;
• determining if subsequent bytes contain a character string indicating that said commands are encoded in a clear text SPDL format;
• and
• if said command are determined not to be encoded in a clear text SPDL format or binary SPDL format, indicating that said commands are from an non-SPDL file.

An apparatus for determining whether page description commands are encoded in a binary or textual SPDL format, comprising:

• binary determining means for determining if any of three beginning tags of said commands contain an object identifier indicating that the commands are in a binary SPDL format;
• means for parsing the document in binary if the binary determining means determines that the first three tags of said commands contain an object identifier indicating that the commands are in a binary SPDL format;
• clear text determining means for determining if a beginning of the file commands bytes representing zero or more spaces, carriage returns, line feeds, or tabs followed by a pattern indicating that the commands are in a clear text SPDL format;
• and
• means for parsing the commands in clear text if the clear text determining means determines that the file has been encoded in a clear text SPDL.