vb.net barcode scanner webcam Section 3: Basic Encoding Rules in Software

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Section 3: Basic Encoding Rules
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The Basic Encoding Rules (BER) for ASN.1 give one or more ways to represent any ASN.1 value as an octet string. (There are certainly other ways to represent ASN.1 values, but BER is the standard for interchanging such values in OSI.) There are three methods to encode an ASN.1 value under BER, the choice of which depends on the type of value and whether the length of the
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Appendix B
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value is known. The three methods are primitive, definite-length encoding; constructed, definite-length encoding; and constructed, indefinitelength encoding. Simple nonstring types employ the primitive, definite-length method; structured types employ either of the constructed methods; and simple string types employ any of the methods, depending on whether the length of the value is known. Types derived by implicit tagging employ the method of the underlying type, and types derived by explicit tagging employ the constructed methods. In each method, the BER encoding has three or four parts: 1. Identifier octets These identify the class and tag number of the ASN.1 value, and indicate whether the method is primitive or constructed. 2. Length octets For the definite-length methods, these give the number of contents octets. For the constructed, indefinite-length method, these indicate that the length is indefinite. 3. Contents octets For the primitive, definite-length method, these give a concrete representation of the value. For the constructed methods, these give the concatenation of the BER encodings of the components of the value. 4. End-of-contents octets For the constructed, indefinite-length method, these denote the end of the contents. For the other methods, these are absent. The three methods of encoding are described in the following sections.
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Section: 3.1: Primitive, Definite-Length Method
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This method applies to simple types and types derived from simple types by implicit tagging. It requires that the length of the value be known in advance. The parts of the BER encoding are as follows:
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Identifier Octets
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There are two forms: low tag number (for tag numbers between 0 and 30) and high tag number (for tag numbers 31 and greater). One octet. Bits 8 and 7 specify the class (see Table B-2), bit 6 has value 0, indicating that the encoding is primitive, and bits 5 1 give the tag number.
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Low-Tag-Number Form
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A Layman s Guide to a Subset of ASN.1, BER, and DER
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Table B-2 Class Encoding in Identifier Octets
Class universal application context-specific private Bit 8 0 0 1 1 Bit 7 0 1 0 1
High-Tag-Number Form Two or more octets. First octet is as in low-tagnumber form, except that bits 5 1 all have value 1. Second and following octets give the tag number, base 128, most significant digit first, with as few digits as possible, and with the bit 8 of each octet except the last set to 1.
Length Octets
There are two forms: short (for lengths between 0 and 127), and long definite (for lengths between 0 and 21008 1).
Short Form
One octet. Bit 8 has value 0 and bits 7 1 give the length.
Long Form Two to 127 octets. Bit 8 of first octet has value 1 and bits
7 1 give the number of additional length octets. Second and following octets give the length, base 256, most significant digit first.
Contents Octets
These give a concrete representation of the value (or the value of the underlying type, if the type is derived by implicit tagging). Details for particular types are given in Section 5.
Section 3.2: Constructed, Definite-Length Method
This method applies to simple string types, structured types, types derived from simple string types and structured types by implicit tagging, and types derived from anything by explicit tagging. It requires that the length of the value be known in advance. The parts of the BER encoding are as follows.
Appendix B
Identifier Octets
As described in Section 3.1, except that bit 6 has value 1, indicating that the encoding is constructed.
Length Octets
As described in Section 3.1.
Contents Octets
The concatenation of the BER encodings of the components of the value:
For simple string types and types derived from them by implicit tagging, the concatenation of the BER encodings of consecutive substrings of the value (underlying value for implicit tagging) For structured types and types derived from them by implicit tagging, the concatenation of the BER encodings of components of the value (underlying value for implicit tagging) For types derived from anything by explicit tagging, the BER encoding of the underlying value
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