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datamatrix error correction passes
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Henry Schimke
281
src/datamatrix/encoder/error_correction.rs
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281
src/datamatrix/encoder/error_correction.rs
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/*
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* Copyright 2006 Jeremias Maerki.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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use crate::Exceptions;
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use super::SymbolInfo;
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use lazy_static::lazy_static;
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/**
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* Error Correction Code for ECC200.
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*/
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/**
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* Lookup table which factors to use for which number of error correction codewords.
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* See FACTORS.
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*/
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const FACTOR_SETS: [u32; 16] = [5, 7, 10, 11, 12, 14, 18, 20, 24, 28, 36, 42, 48, 56, 62, 68];
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lazy_static! {
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/**
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* Precomputed polynomial factors for ECC 200.
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*/
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static ref FACTORS: [Vec<u32>; 16] = [
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Vec::from([228, 48, 15, 111, 62]),
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Vec::from([23, 68, 144, 134, 240, 92, 254]),
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Vec::from([28, 24, 185, 166, 223, 248, 116, 255, 110, 61]),
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Vec::from([175, 138, 205, 12, 194, 168, 39, 245, 60, 97, 120]),
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Vec::from([41, 153, 158, 91, 61, 42, 142, 213, 97, 178, 100, 242]),
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Vec::from([
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156, 97, 192, 252, 95, 9, 157, 119, 138, 45, 18, 186, 83, 185,
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]),
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Vec::from([
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83, 195, 100, 39, 188, 75, 66, 61, 241, 213, 109, 129, 94, 254, 225, 48, 90, 188,
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]),
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Vec::from([
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15, 195, 244, 9, 233, 71, 168, 2, 188, 160, 153, 145, 253, 79, 108, 82, 27, 174, 186, 172,
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]),
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Vec::from([
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52, 190, 88, 205, 109, 39, 176, 21, 155, 197, 251, 223, 155, 21, 5, 172, 254, 124, 12, 181,
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184, 96, 50, 193,
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]),
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Vec::from([
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211, 231, 43, 97, 71, 96, 103, 174, 37, 151, 170, 53, 75, 34, 249, 121, 17, 138, 110, 213,
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141, 136, 120, 151, 233, 168, 93, 255,
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]),
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Vec::from([
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245, 127, 242, 218, 130, 250, 162, 181, 102, 120, 84, 179, 220, 251, 80, 182, 229, 18, 2,
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4, 68, 33, 101, 137, 95, 119, 115, 44, 175, 184, 59, 25, 225, 98, 81, 112,
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]),
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Vec::from([
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77, 193, 137, 31, 19, 38, 22, 153, 247, 105, 122, 2, 245, 133, 242, 8, 175, 95, 100, 9,
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167, 105, 214, 111, 57, 121, 21, 1, 253, 57, 54, 101, 248, 202, 69, 50, 150, 177, 226, 5,
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9, 5,
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]),
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Vec::from([
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245, 132, 172, 223, 96, 32, 117, 22, 238, 133, 238, 231, 205, 188, 237, 87, 191, 106, 16,
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147, 118, 23, 37, 90, 170, 205, 131, 88, 120, 100, 66, 138, 186, 240, 82, 44, 176, 87, 187,
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147, 160, 175, 69, 213, 92, 253, 225, 19,
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]),
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Vec::from([
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175, 9, 223, 238, 12, 17, 220, 208, 100, 29, 175, 170, 230, 192, 215, 235, 150, 159, 36,
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223, 38, 200, 132, 54, 228, 146, 218, 234, 117, 203, 29, 232, 144, 238, 22, 150, 201, 117,
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62, 207, 164, 13, 137, 245, 127, 67, 247, 28, 155, 43, 203, 107, 233, 53, 143, 46,
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]),
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Vec::from([
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242, 93, 169, 50, 144, 210, 39, 118, 202, 188, 201, 189, 143, 108, 196, 37, 185, 112, 134,
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230, 245, 63, 197, 190, 250, 106, 185, 221, 175, 64, 114, 71, 161, 44, 147, 6, 27, 218, 51,
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63, 87, 10, 40, 130, 188, 17, 163, 31, 176, 170, 4, 107, 232, 7, 94, 166, 224, 124, 86, 47,
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11, 204,
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]),
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Vec::from([
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220, 228, 173, 89, 251, 149, 159, 56, 89, 33, 147, 244, 154, 36, 73, 127, 213, 136, 248,
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180, 234, 197, 158, 177, 68, 122, 93, 213, 15, 160, 227, 236, 66, 139, 153, 185, 202, 167,
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179, 25, 220, 232, 96, 210, 231, 136, 223, 239, 181, 241, 59, 52, 172, 25, 49, 232, 211,
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189, 64, 54, 108, 153, 132, 63, 96, 103, 82, 186,
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]),
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];
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}
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const MODULO_VALUE: usize = 0x12D;
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const LOG: [u32; 256] = {
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let mut log_array = [0u32; 256];
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let mut p = 1;
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let mut i = 0;
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while i < 255 {
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log_array[p] = i;
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p *= 2;
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if p >= 256 {
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p ^= MODULO_VALUE;
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}
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i += 1;
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}
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log_array
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};
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const ALOG: [u32; 255] = {
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let mut alog_array = [0u32; 255];
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let mut p = 1_usize;
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let mut i = 0;
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while i < 255 {
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// for (int i = 0; i < 255; i++) {
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alog_array[i] = p as u32;
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p *= 2;
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if p >= 256 {
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p ^= MODULO_VALUE;
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}
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i += 1;
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}
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alog_array
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};
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// static {
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// //Create log and antilog table
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// LOG = new int[256];
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// ALOG = new int[255];
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// int p = 1;
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// for (int i = 0; i < 255; i++) {
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// ALOG[i] = p;
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// LOG[p] = i;
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// p *= 2;
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// if (p >= 256) {
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// p ^= MODULO_VALUE;
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// }
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// }
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// }
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/**
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* Creates the ECC200 error correction for an encoded message.
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*
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* @param codewords the codewords
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* @param symbolInfo information about the symbol to be encoded
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* @return the codewords with interleaved error correction.
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*/
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pub fn encodeECC200(codewords: &str, symbolInfo: &SymbolInfo) -> Result<String, Exceptions> {
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if codewords.chars().count() != symbolInfo.getDataCapacity() as usize {
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return Err(Exceptions::IllegalArgumentException(
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"The number of codewords does not match the selected symbol".to_owned(),
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));
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}
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let mut sb = String::with_capacity(
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(symbolInfo.getDataCapacity() + symbolInfo.getErrorCodewords()) as usize,
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);
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sb.push_str(codewords);
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let blockCount = symbolInfo.getInterleavedBlockCount() as usize;
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if blockCount == 1 {
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let ecc = createECCBlock(codewords, symbolInfo.getErrorCodewords() as usize)?;
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sb.push_str(&ecc);
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} else {
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//sb.setLength(sb.capacity());
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let mut dataSizes = vec![0u32; blockCount];
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let mut errorSizes = vec![0u32; blockCount];
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for i in 0..blockCount {
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// for (int i = 0; i < blockCount; i++) {
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dataSizes[i] = symbolInfo.getDataLengthForInterleavedBlock(i as u32 + 1) as u32;
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errorSizes[i] = symbolInfo.getErrorLengthForInterleavedBlock(i as u32 + 1) as u32;
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}
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for block in 0..blockCount {
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// for (int block = 0; block < blockCount; block++) {
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let mut temp = String::with_capacity(dataSizes[block] as usize);
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let mut d = block;
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while d < symbolInfo.getDataCapacity() as usize {
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// for (int d = block; d < symbolInfo.getDataCapacity(); d += blockCount) {
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temp.push(codewords.chars().nth(d).unwrap());
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d += blockCount;
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}
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let ecc = createECCBlock(&temp, errorSizes[block] as usize)?;
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let mut pos = 0;
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let mut e = block;
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while e < errorSizes[block] as usize * blockCount as usize {
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// for (int e = block; e < errorSizes[block] * blockCount; e += blockCount) {
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let (char_index, replace_char) = sb
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.char_indices()
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.nth(symbolInfo.getDataCapacity() as usize + e)
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.unwrap();
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sb.replace_range(
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char_index..(replace_char.len_utf8()),
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&ecc.chars().nth(pos).unwrap().to_string(),
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);
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// sb.setCharAt(symbolInfo.getDataCapacity() + e, ecc.charAt(pos));
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pos += 1;
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e += blockCount;
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}
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}
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}
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Ok(sb)
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}
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fn createECCBlock(codewords: &str, numECWords: usize) -> Result<String, Exceptions> {
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let mut table = -1_isize;
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for i in 0..FACTOR_SETS.len() {
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// for (int i = 0; i < FACTOR_SETS.length; i++) {
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if FACTOR_SETS[i] as usize == numECWords {
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table = i as isize;
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break;
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}
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}
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if table < 0 {
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return Err(Exceptions::IllegalArgumentException(format!(
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"Illegal number of error correction codewords specified: {}",
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numECWords
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)));
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}
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let poly = &FACTORS[table as usize];
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let mut ecc = vec![0 as char; numECWords];
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// for i in 0..numECWords {
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// // for (int i = 0; i < numECWords; i++) {
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// ecc[i] = 0;
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// }
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for i in 0..codewords.chars().count() {
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// for (int i = 0; i < codewords.length(); i++) {
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let m = ecc[numECWords - 1] as usize ^ codewords.chars().nth(i).unwrap() as usize;
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for k in (1..numECWords).rev() {
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// for (int k = numECWords - 1; k > 0; k--) {
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if m != 0 && poly[k] != 0 {
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ecc[k] = char::from_u32(
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ecc[k - 1] as u32 ^ ALOG[(LOG[m] + LOG[poly[k] as usize]) as usize % 255],
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)
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.unwrap();
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} else {
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ecc[k] = ecc[k - 1];
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}
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}
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if m != 0 && poly[0] != 0 {
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ecc[0] = char::from_u32(ALOG[(LOG[m] + LOG[poly[0] as usize]) as usize % 255]).unwrap();
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} else {
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ecc[0] = 0 as char;
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}
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}
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// let eccReversed = new char[numECWords];
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// for (int i = 0; i < numECWords; i++) {
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// eccReversed[i] = ecc[numECWords - i - 1];
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// }
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// return String.valueOf(eccReversed);
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Ok(ecc.into_iter().rev().collect())
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}
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#[cfg(test)]
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mod test_case {
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use crate::datamatrix::encoder::{high_level_encode_test_case::visualize, SymbolInfoLookup};
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use super::encodeECC200;
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#[test]
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fn testRS() {
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//Sample from Annexe R in ISO/IEC 16022:2000(E)
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let cw: [char; 3] = [142 as char, 164 as char, 186 as char];
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let symbolInfo = SymbolInfoLookup::new()
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.lookup(3)
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.expect("find lookup")
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.unwrap(); //SymbolInfo.lookup(3);
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let s = encodeECC200(&String::from_iter(cw), symbolInfo).expect("encode");
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assert_eq!("142 164 186 114 25 5 88 102", visualize(&s));
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//"A" encoded (ASCII encoding + 2 padding characters)
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let cw: [char; 3] = [66 as char, 129 as char, 70 as char];
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let s = encodeECC200(&String::from_iter(cw), symbolInfo).expect("encode");
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assert_eq!("66 129 70 138 234 82 82 95", visualize(&s));
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}
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}
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