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receiving entity reorder the bytes, as needed Either option would require the sender or receiver to learn the other's format for integer representation A third option is to have a machine-, OS-, language-independent method for describing integers and other data types (ie, a data description language) and rules that state the manner in which each of the data types are to be transmitted over the network When data of a given type is received, it is received in an known format and can then be stored in whatever machine-specific format is required Both the SMI that we studied in section 83 and ASN1 adopt this third option In ISO parlance, these two standards describe a presentation service - the service of transmitting and translating information from one machine-specific format to another Figures 84-2 illustrates a real-world presentation problem; neither receiver understands the essential idea being communicated - that the speaker likes something As shown in Figure 84-3, a presentation service can solve this problem by translating the idea into a commonly understood (by the presentation service), person-independent language, sending that information to the receiver, and then translating into a language understood by the receiver
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Figure 84-2: The presentation problem
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Figure 84-3: The presentation problem solved
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Table 84-1 shows a few of the ASN1 defined data types Recall that we encountered the INTEGER, OCTET STRING and OBJECT IDENTIFIER data types in our earlier study of the SMI Since our goal here is (mercifully) not to provide a complete introduction to ASN1, we refer the reader to the standards or to the printed and on-line book [Larmouth 1996] for a description of ASN1 types and constructors such as SEQUENCE and SET that allow for the definition of more structures
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Tag Type 1 2 3 4 5 6 9 BOOLEAN INTEGER BITSTRING OCTET STRING NULL REAL
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Description value is "true" or "false" can be arbitrarily large list of one or more bits list of one or more bytes no value floating point Table 84-1: selected ASN1 Data Types
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OBJECT IDENTIFIER name, in the ASN1 standard naming tree, see section 822
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In addition to providing a data description language, ASN1 also provides Basic Encoding Rules (BER) that specify how instances of objects that have been defined using the ASN1 data description language are to be sent over the network The BER adopts a so-called TLV (Type, Length, Value) approach to encoding data for transmission For each data item to be sent, the data type, the length of the data item, and then the actual value of the data item are sent, in that order With this simple convention, the received data is essentially self identifying Figure 844 shows how the two data items in our simple C-language example above would be sent In this example, the sender wants to send the letter 'a' followed by the value 259 decimal (which equals 00000001 00000011 in binary, or a byte value of 1 followed by a byte value of 3) assuming big-endian order The first byte in the transmitted stream has the value 4, indicating that the type of the following data item is an OCTET STRING; this is the 'T' in the TLV encoding The second byte in the stream contains the length of the OCTET STRING, in this case 1 The third byte in the transmitted stream begins (and ends) the OCTET STRING of length one; it contains the ASCII representation of the letter 'a' The T, L, and V values of the next data item are 2 (the INTEGER type tag value), 2 (ie, an Integer of length 2 bytes), and the two-byte big-endian representation of the value 259 decimal)
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Figure 84-4: BER encoding example
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In our discussion above, we have only touched on a small and simple subset of ASN1 Resources for learning more about ASN1 include the ASN1 standards document [ISO 1987, ISOX680], Philipp Hoschka's ASN1 homepage [Hoschka 1997], and [Larmouth 1996]
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