Method and system to recognize encoding type in document process

Details Method and system to recognize encoding type in document process Method and system to recognize encoding type in document process

1993-01-19

1995-08-01

Powell, Mark R.

G06F 312

Patent

active

054386500

ABSTRACT:
A method and system to efficiently and automatically determine whether a document to be processed and printed has been encoded in a binary or clear text representation of a page description language. The document is initially processed as if it were binary encoded and the first three tags of the document are examined to determine if they contain the object identifier having the value "28 CF 44 00 H". If one of the first three tags has this value, an encoding flag is set to indicate the document is a binary SPDL file and the recognition process is terminated. If the document is determined not to be a binary SPDL file it is examined to see if it is clear text SPDL file. The beginning of the document is examined to determine if it contains zero or more S separators which are defined to be spaces, carriage returns, line feeds, and tabs followed by the characters "<!DOCTYPE" regardless of capitalization followed by one or more S separators followed by the characters "SPDL". If these characters exist in order, the document is determined to be a clear text encoded SPDL document. The binary and clear text encoded SPDL documents are then processed for printing. If the document is determined not to be a clear text or binary encoded SPDL document, an indication is given that the file is not an SPDL file.

REFERENCES:
patent: 4994998 (1991-02-01), Anezaki
patent: 5263137 (1993-11-01), Anezaki
patent: 5291583 (1994-03-01), Bapat
patent: 5303336 (1994-04-01), Kageyama et al.
patent: 5323393 (1994-06-01), Barrett et al.
patent: 5353388 (1994-10-01), Motoyama
ISO/IEC DIS 10180, Information Processing-Text Communication-Standard Page Description Language; Draft International Standard 1991-03, 1991.
ISO/IEC 8824, Information technology-Open Systems Interconenction-Specification of Abstract Syntax Notation One (ASN.1), International Standard (1990).
ISO/IEC 8825, Information technology-Open Systems Interconnection-Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1( (1990).

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