- Generated by
1.9.8
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BDE 4.39.x Production Release
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Basic Application Library BER (balber)
Provide encoding/decoding of data per the (binary) BER rules.
Basic Application Library BER (balber)
The balber ("Basic Application BER") package defines classes that can encode and decode data per the X.690 BER (Basic Encoding Rules) specification. These classes can be used only for types supported by the bdlat framework. Typical usage is illustrated in balber_berdecoder and balber_berencoder .
There are 2 sets of the encoding/decoding member functions:
encode & decode, andencodeAny & decodeAny (referred as "any-functions" below).The first set uses templates and compile-time metaprogramming to generate the encoding/decoding C++ code. The second set uses the runtime dispatch approach - base classes and virtual functions - to provide the same functionality. The result does not depend on the functions you use - their functionality is absolutely identical. The difference is not in what they do, but in how they do it.
As usual, the compile-time approach can be faster, but generates a lot of code. And since this code is in the headers, this causes big load on the compiler and linker - the generated code is in each translation unit and in the object file generated from it. As a result, slow compilation, huge memory and CPU consumption during the compilation and linking, and a larger resulting executable file size.
All the above mentioned shortcomings (except the final runtime performance) can be mitigated by using the "any-functions", at the cost of a small runtime slowdown. All the encoding/decoding code is pre-compiled and located in one place - the BDE library (archive) files. But how big is the execution slowdown? Our benchmarks show that the slowdown is less than 10%.
The 'balber' package currently has 8 components having 4 levels of physical dependency. The list below shows the hierarchical ordering of the components. The order of components within each level is not architecturally significant, just alphabetical.
balber_berconstants : Provide namespace for BER-related constants.
balber_berdecoder : Provide a BER decoder class.
balber_berdecoderoptions : Provide an attribute class for specifying BER decoding options.
balber_berencoder : Provide a BER encoder class.
balber_berencoderoptions : Provide value-semantic attribute classes
balber_berencoderoptionsutil : Provide a utility for configuring balber::BerEncoderOptions.
balber_beruniversaltagnumber : Enumerate the set of BER universal tag numbers.
balber_berutil : Provide functions to encode and decode simple types in BER format.
Modules | |
| balber_berconstants | |
| balber_berdecoder | |
| balber_berdecoderoptions | |
| balber_berencoder | |
| balber_berencoderoptions | |
| balber_berencoderoptionsutil | |
| balber_beruniversaltagnumber | |
| balber_berutil | |
1.9.8