文件列表:

.travis.yml (91, 2020-01-01)
Makefile (4334, 2020-01-01)
schifra_bitio_example01.cpp (2238, 2020-01-01)
schifra_bitio_example02.cpp (2394, 2020-01-01)
schifra_crc.hpp (4728, 2020-01-01)
schifra_ecc_traits.hpp (4656, 2020-01-01)
schifra_erasure_channel.hpp (9637, 2020-01-01)
schifra_erasure_channel_example01.cpp (7617, 2020-01-01)
schifra_erasure_channel_example02.cpp (6660, 2020-01-01)
schifra_error_processes.hpp (23979, 2020-01-01)
schifra_file_interleaving_example01.cpp (1831, 2020-01-01)
schifra_file_interleaving_example02.cpp (1836, 2020-01-01)
schifra_file_interleaving_example03.cpp (2198, 2020-01-01)
schifra_fileio.hpp (7636, 2020-01-01)
schifra_galois_field.hpp (18778, 2020-01-01)
schifra_galois_field_element.hpp (8001, 2020-01-01)
schifra_galois_field_polynomial.hpp (26538, 2020-01-01)
schifra_galois_utilities.hpp (4112, 2020-01-01)
schifra_interleaving_example01.cpp (2563, 2020-01-01)
schifra_interleaving_example02.cpp (2475, 2020-01-01)
schifra_interleaving_example03.cpp (3518, 2020-01-01)
schifra_license.txt (19549, 2020-01-01)
schifra_reed_solomon_bitio.hpp (6690, 2020-01-01)
schifra_reed_solomon_block.hpp (12820, 2020-01-01)
schifra_reed_solomon_codec_validation.cpp (1916, 2020-01-01)
schifra_reed_solomon_codec_validator.hpp (42557, 2020-01-01)
schifra_reed_solomon_decoder.hpp (17196, 2020-01-01)
schifra_reed_solomon_encoder.hpp (6757, 2020-01-01)
schifra_reed_solomon_example01.cpp (5473, 2020-01-01)
schifra_reed_solomon_example02.cpp (5598, 2020-01-01)
schifra_reed_solomon_example03.cpp (5753, 2020-01-01)
schifra_reed_solomon_example04.cpp (6364, 2020-01-01)
schifra_reed_solomon_example05.cpp (6343, 2020-01-01)
schifra_reed_solomon_example06.cpp (6348, 2020-01-01)
schifra_reed_solomon_example07.cpp (6348, 2020-01-01)
schifra_reed_solomon_example08.cpp (5491, 2020-01-01)
schifra_reed_solomon_example09.cpp (5442, 2020-01-01)
schifra_reed_solomon_file_decoder.hpp (6440, 2020-01-01)
... ...

#### Description Schifra is a very robust, highly optimized and extremely configurable Reed-Solomon error correcting code library for software applications implemented in C++. Schifra supports standard, shortened and punctured Reed-Solomon codes. It also has support for stacked product codes and interleaving. Schifra provides a concise, predictable and deterministic interface which lends itself to easy and seamless integration into the development of complex data communication projects requiring Reed- Solomon error correcting code capabilities. ---- #### Download http://www.schifra.com ---- #### Features * Errors and Erasures * Supported Symbol Sizes - 2 to 32 bits * Variable Code Block Length * User defined primitive polynomial and finite field * Accurate and Validated Reed-Solomon Codecs - Complete combinatorial errors and erasures unit testing * Supported Architectures For Optimizations - x86-32, x86-***, PowerPC, m68k, XScale * Supported Reed-Solomon Codes - Intelsat 1-4, DVB(S and T), MPEG-2 TSP, VDL Mode 2-4, MIL-STD-188-165a, ITU-T G.709, CCSDS (Basis transform), CIRC, ETS 300-421, ETS 300-429, xDSL, PostBar, MaxiCode, DataMatrix and many more... * Shortened, Punctured and Concatenated Reed-Solomon Codes - WiMAX IEEE 802.16d standard * Product Codes * Standard and Algebraic Interleavers * Special Optimized Decoder - For cases of 2t = 2, 4, 6, 16 and 32 * DO-178B Level A Certified Reed-Solomon Codec - RTCA DO-224A for VDL mode 2 and 3, RTCA DO-242A (ADS-B), Certified for installation on-board airborne systems * Reed-Solomon Based channel code for Erasure Channels ---- #### Compatible C++ Compilers + GNU Compiler Collection (3.1+) + Intel C++ Compiler (8.x+) + Clang/LLVM (1.1+) + PGI C++ (10.x+) + Microsoft Visual Studio C++ Compiler (7.1+) + IBM XL C/C++ (9.x+) ---- #### C++ Encoder/Decoder Example This example will demonstrate using C++ how to instantiate a Reed- Solomon encoder and decoder, add the full amount of possible errors, correct the errors, and output the various pieces of relevant information. The Reed-Solomon code's properties are as follows: + Symbol size: 8-bits + Codeword length: 255 + Number of data symbols: 223 + Number of FEC symbols: 32 + Finite Field: GF(2⁸) + Finite Field polynomial: 1x⁸ + 1x⁷ + 0x⁶ + 0x⁵ + 0x⁴ + 0x³ + 1x² + 1x¹ + 1x⁰ + Generator polynomial roots: 32 + Generator polynomial field index: 120th element (32 consecutive roots)  ```c++ #include #include #include #include "schifra_galois_field.hpp" #include "schifra_galois_field_polynomial.hpp" #include "schifra_sequential_root_generator_polynomial_creator.hpp" #include "schifra_reed_solomon_encoder.hpp" #include "schifra_reed_solomon_decoder.hpp" #include "schifra_reed_solomon_block.hpp" #include "schifra_error_processes.hpp" int main() { /* Finite Field Parameters */ const std::size_t field_descriptor = 8; const std::size_t generator_polynomial_index = 120; const std::size_t generator_polynomial_root_count = 32; /* Reed Solomon Code Parameters */ const std::size_t code_length = 255; const std::size_t fec_length = 32; const std::size_t data_length = code_length - fec_length; /* Instantiate Finite Field and Generator Polynomials */ const schifra::galois::field field(field_descriptor, schifra::galois::primitive_polynomial_size06, schifra::galois::primitive_polynomial06); schifra::galois::field_polynomial generator_polynomial(field); if ( !schifra::make_sequential_root_generator_polynomial( field, generator_polynomial_index, generator_polynomial_root_count, generator_polynomial) ) { std::cout << "Error - Failed to create sequential root generator!" << std::endl; return 1; } /* Instantiate Encoder and Decoder (Codec) */ typedef schifra::reed_solomon::encoder encoder_t; typedef schifra::reed_solomon::decoder decoder_t; const encoder_t encoder(field,generator_polynomial); const decoder_t decoder(field,generator_polynomial_index); std::string message = "An expert is someone who knows more and more about less and " "less until they know absolutely everything about nothing"; /* Pad message with nulls up until the code-word length */ message.resize(code_length,0x00); /* Instantiate RS Block For Codec */ schifra::reed_solomon::block block; /* Transform message into Reed-Solomon encoded codeword */ if (!encoder.encode(message,block)) { std::cout << "Error - Critical decoding failure! " << "Msg: " << block.error_as_string() << std::endl; return 1; } /* Add errors at every 3rd location starting at position zero */ schifra::corrupt_message_all_errors00(block, 0, 3); if (!decoder.decode(block)) { std::cout << "Error - Critical decoding failure!" << std::endl; return 1; } else if (!schifra::is_block_equivelent(block,message)) { std::cout << "Error - Error correction failed!" << std::endl; return 1; } block.data_to_string(message); return 0; } ``` ---- #### Performance The following table is a listing of results obtained from running the schifra_reed_solomon_speed_evaluation benchmark. The benchmark measures the decoding rate of codewords in two modalities: "All Errors" and "All Erasures". | Reed Solomon Codec | All Errors Decoding Rate (Mbps) | All Erasures Decoding Rate (Mbps) | | :--------------------| :--------------------------------: | :---------------------------------: | | RS(255,253,002) | 1669.275 | 1542.483 | | RS(255,251,004) | 1103.620 | 1019.695 | | RS(255,249,006) | 843.524 | 781.815 | | RS(255,247,008) | 670.612 | 612.418 | | RS(255,245,010) | 552.918 | 513.101 | | RS(255,243,012) | 461.485 | 430.707 | | RS(255,241,014) | 399.025 | 378.728 | | RS(255,239,016) | 355.399 | 338.250 | | RS(255,237,018) | 315.294 | 304.094 | | RS(255,235,020) | 282.269 | 273.023 | | RS(255,223,032) | 173.067 | 162.276 | | RS(255,207,048) | 106.055 | 102.039 | | RS(255,191,0***) | 75.213 | 72.671 | | RS(255,175,080) | 56.374 | 53.210 | | RS(255,159,096) | 41.354 | 41.009 | | RS(255,127,128) | 25.445 | 24.823 | **Note:** The above results were obtained by compiling the benchmark with GCC 7.2 with O3, LTO, PGO and native architecture target compiler settings, and executed upon an Intel Xeon E5-2687W 3GHz CPU, ***GB RAM, Ubuntu 16.10 with kernel 4.13 system. ##### Benchmark Binaries + [Linux](http://www.schifra.com/downloads/schifra_reed_solomon_speed_evaluation_linux.zip) + [Windows](http://www.schifra.com/downloads/schifra_reed_solomon_speed_evaluation_win32.zip)

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