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port data_block

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Henry Schimke
2022-11-08 16:38:32 -06:00
parent 783584a75b
commit 492fa0f09d
3 changed files with 154 additions and 119 deletions
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118
src/datamatrix/decoder/DataBlock.java
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@@ -1,118 +0,0 @@
/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.datamatrix.decoder;
/**
* <p>Encapsulates a block of data within a Data Matrix Code. Data Matrix Codes may split their data into
* multiple blocks, each of which is a unit of data and error-correction codewords. Each
* is represented by an instance of this class.</p>
*
* @author bbrown@google.com (Brian Brown)
*/
final class DataBlock {
private final int numDataCodewords;
private final byte[] codewords;
private DataBlock(int numDataCodewords, byte[] codewords) {
this.numDataCodewords = numDataCodewords;
this.codewords = codewords;
}
/**
* <p>When Data Matrix Codes use multiple data blocks, they actually interleave the bytes of each of them.
* That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
* method will separate the data into original blocks.</p>
*
* @param rawCodewords bytes as read directly from the Data Matrix Code
* @param version version of the Data Matrix Code
* @return DataBlocks containing original bytes, "de-interleaved" from representation in the
* Data Matrix Code
*/
static DataBlock[] getDataBlocks(byte[] rawCodewords,
Version version) {
// Figure out the number and size of data blocks used by this version
Version.ECBlocks ecBlocks = version.getECBlocks();
// First count the total number of data blocks
int totalBlocks = 0;
Version.ECB[] ecBlockArray = ecBlocks.getECBlocks();
for (Version.ECB ecBlock : ecBlockArray) {
totalBlocks += ecBlock.getCount();
}
// Now establish DataBlocks of the appropriate size and number of data codewords
DataBlock[] result = new DataBlock[totalBlocks];
int numRXingResultBlocks = 0;
for (Version.ECB ecBlock : ecBlockArray) {
for (int i = 0; i < ecBlock.getCount(); i++) {
int numDataCodewords = ecBlock.getDataCodewords();
int numBlockCodewords = ecBlocks.getECCodewords() + numDataCodewords;
result[numRXingResultBlocks++] = new DataBlock(numDataCodewords, new byte[numBlockCodewords]);
}
}
// All blocks have the same amount of data, except that the last n
// (where n may be 0) have 1 less byte. Figure out where these start.
// TODO(bbrown): There is only one case where there is a difference for Data Matrix for size 144
int longerBlocksTotalCodewords = result[0].codewords.length;
//int shorterBlocksTotalCodewords = longerBlocksTotalCodewords - 1;
int longerBlocksNumDataCodewords = longerBlocksTotalCodewords - ecBlocks.getECCodewords();
int shorterBlocksNumDataCodewords = longerBlocksNumDataCodewords - 1;
// The last elements of result may be 1 element shorter for 144 matrix
// first fill out as many elements as all of them have minus 1
int rawCodewordsOffset = 0;
for (int i = 0; i < shorterBlocksNumDataCodewords; i++) {
for (int j = 0; j < numRXingResultBlocks; j++) {
result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
}
}
// Fill out the last data block in the longer ones
boolean specialVersion = version.getVersionNumber() == 24;
int numLongerBlocks = specialVersion ? 8 : numRXingResultBlocks;
for (int j = 0; j < numLongerBlocks; j++) {
result[j].codewords[longerBlocksNumDataCodewords - 1] = rawCodewords[rawCodewordsOffset++];
}
// Now add in error correction blocks
int max = result[0].codewords.length;
for (int i = longerBlocksNumDataCodewords; i < max; i++) {
for (int j = 0; j < numRXingResultBlocks; j++) {
int jOffset = specialVersion ? (j + 8) % numRXingResultBlocks : j;
int iOffset = specialVersion && jOffset > 7 ? i - 1 : i;
result[jOffset].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
}
}
if (rawCodewordsOffset != rawCodewords.length) {
throw new IllegalArgumentException();
}
return result;
}
int getNumDataCodewords() {
return numDataCodewords;
}
byte[] getCodewords() {
return codewords;
}
}

151
src/datamatrix/decoder/data_block.rs Normal file
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@@ -0,0 +1,151 @@
/*
* Copyright 2008 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use crate::Exceptions;
use super::Version;
/**
* <p>Encapsulates a block of data within a Data Matrix Code. Data Matrix Codes may split their data into
* multiple blocks, each of which is a unit of data and error-correction codewords. Each
* is represented by an instance of this class.</p>
*
* @author bbrown@google.com (Brian Brown)
*/
pub struct DataBlock {
numDataCodewords: u32,
codewords: Vec<u8>,
}
impl DataBlock {
pub fn new(numDataCodewords: u32, codewords: Vec<u8>) -> Self {
Self {
numDataCodewords,
codewords,
}
}
/**
* <p>When Data Matrix Codes use multiple data blocks, they actually interleave the bytes of each of them.
* That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
* method will separate the data into original blocks.</p>
*
* @param rawCodewords bytes as read directly from the Data Matrix Code
* @param version version of the Data Matrix Code
* @return DataBlocks containing original bytes, "de-interleaved" from representation in the
* Data Matrix Code
*/
pub fn getDataBlocks(
rawCodewords: &[u8],
version: &Version,
) -> Result<Vec<DataBlock>, Exceptions> {
// Figure out the number and size of data blocks used by this version
let ecBlocks = version.getECBlocks();
// First count the total number of data blocks
let mut totalBlocks = 0_usize;
let ecBlockArray = ecBlocks.getECBlocks();
for ecBlock in ecBlockArray {
totalBlocks += ecBlock.getCount() as usize;
}
// Now establish DataBlocks of the appropriate size and number of data codewords
let mut result = Vec::with_capacity(totalBlocks);
let numRXingResultBlocks = 0;
for ecBlock in ecBlockArray {
for _i in 0..ecBlock.getCount() {
// for (int i = 0; i < ecBlock.getCount(); i++) {
let numDataCodewords = ecBlock.getDataCodewords() as usize;
let numBlockCodewords = ecBlocks.getECCodewords() as usize + numDataCodewords;
// result[numRXingResultBlocks++] = new DataBlock(numDataCodewords, new byte[numBlockCodewords]);
result.push(DataBlock::new(
numDataCodewords as u32,
vec![0; numBlockCodewords],
));
}
}
// All blocks have the same amount of data, except that the last n
// (where n may be 0) have 1 less byte. Figure out where these start.
// TODO(bbrown): There is only one case where there is a difference for Data Matrix for size 144
let longerBlocksTotalCodewords = result[0].codewords.len();
//int shorterBlocksTotalCodewords = longerBlocksTotalCodewords - 1;
let longerBlocksNumDataCodewords =
longerBlocksTotalCodewords - ecBlocks.getECCodewords() as usize;
let shorterBlocksNumDataCodewords = longerBlocksNumDataCodewords - 1;
// The last elements of result may be 1 element shorter for 144 matrix
// first fill out as many elements as all of them have minus 1
let mut rawCodewordsOffset = 0;
for i in 0..shorterBlocksNumDataCodewords {
// for (int i = 0; i < shorterBlocksNumDataCodewords; i++) {
for j in 0..numRXingResultBlocks {
// for (int j = 0; j < numRXingResultBlocks; j++) {
result[j].codewords[i] = rawCodewords[rawCodewordsOffset];
rawCodewordsOffset += 1;
}
}
// Fill out the last data block in the longer ones
let specialVersion = version.getVersionNumber() == 24;
let numLongerBlocks = if specialVersion {
8
} else {
numRXingResultBlocks
};
for j in 0..numLongerBlocks {
// for (int j = 0; j < numLongerBlocks; j++) {
result[j].codewords[longerBlocksNumDataCodewords - 1] =
rawCodewords[rawCodewordsOffset];
rawCodewordsOffset += 1;
}
// Now add in error correction blocks
let max = result[0].codewords.len();
for i in longerBlocksNumDataCodewords..max {
// for (int i = longerBlocksNumDataCodewords; i < max; i++) {
for j in 0..numRXingResultBlocks {
// for (int j = 0; j < numRXingResultBlocks; j++) {
let jOffset = if specialVersion {
(j + 8) % numRXingResultBlocks
} else {
j
};
let iOffset = if specialVersion && jOffset > 7 {
i - 1
} else {
i
};
result[jOffset].codewords[iOffset] = rawCodewords[rawCodewordsOffset];
rawCodewordsOffset += 1;
}
}
if rawCodewordsOffset != rawCodewords.len() {
return Err(Exceptions::IllegalArgumentException("".to_owned()));
}
Ok(result)
}
pub fn getNumDataCodewords(&self) -> u32 {
self.numDataCodewords
}
pub fn getCodewords(&self) -> &[u8] {
&self.codewords
}
}

4
src/datamatrix/decoder/mod.rs
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@@ -1,4 +1,6 @@
mod version;
mod data_block;
pub use version::*;
pub use version::*;
pub use data_block::*;