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✏️ Editing: BitMatrix.php

<?php
namespace Zxing\Common;

final class BitMatrix {
    private $width;
    private $height;
    private $rowSize;
    private $bits;

public function __construct($width, $height=false, $rowSize=false, $bits=false) {
 if(!$height){
 $height = $width;
 }
 if(!$rowSize){
 $rowSize = intval(($width + 31) / 32);
 }
 if(!$bits){
 $bits = fill_array(0,$rowSize*$height,0);array();//new int[rowSize * height];
 }
 $this->width = $width;
 $this->height = $height;
 $this->rowSize = $rowSize;
 $this->bits = $bits;
 }
 public static function parse($stringRepresentation, $setString, $unsetString){
 if (!$stringRepresentation) {
 throw new \InvalidArgumentException();
 }
 $bits = array();
 $bitsPos = 0;
 $rowStartPos = 0;
 $rowLength = -1;
 $nRows = 0;
 $pos = 0;
 while ($pos < strlen($stringRepresentation)) {
 if ($stringRepresentation{$pos} == '\n' ||
 $stringRepresentation->{$pos} == '\r') {
 if ($bitsPos > $rowStartPos) {
 if($rowLength == -1) {
 $rowLength = $bitsPos - $rowStartPos;
 }
 else if ($bitsPos - $rowStartPos != $rowLength) {
 throw new \InvalidArgumentException("row lengths do not match");
 }
 $rowStartPos = $bitsPos;
 $nRows++;
 }
 $pos++;
 }
 else if (substr($stringRepresentation,$pos, strlen($setString))==$setString) {
 $pos += strlen($setString);
 $bits[$bitsPos] = true;
 $bitsPos++;
 }
 else if (substr($stringRepresentation, $pos + strlen($unsetString))==$unsetString) {
 $pos += strlen($unsetString);
 $bits[$bitsPos] = false;
 $bitsPos++;
 } else {
 throw new \InvalidArgumentException(
 "illegal character encountered: " . substr($stringRepresentation,$pos));
 }
 }

// no EOL at end?
        if ($bitsPos > $rowStartPos) {
            if($rowLength == -1) {
                $rowLength = $bitsPos - $rowStartPos;
            } else if ($bitsPos - $rowStartPos != $rowLength) {
                throw new \InvalidArgumentException("row lengths do not match");
            }
            $nRows++;
        }

$matrix = new BitMatrix($rowLength, $nRows);
 for ($i = 0; $i < $bitsPos; $i++) {
 if ($bits[$i]) {
 $matrix->set($i % $rowLength, $i / $rowLength);
 }
 }
 return $matrix;
 }

/**
 * Gets the requested bit, where true means black.
 *
 * @param $x; The horizontal component (i.e. which column)
 * @param $y; The vertical component (i.e. which row)
 * @return value of given bit in matrix
 */
 public function get($x, $y) {

$offset = intval($y * $this->rowSize + ($x / 32));
        if(!isset($this->bits[$offset])){
            $this->bits[$offset] = 0;
        }

// return (($this->bits[$offset] >> ($x & 0x1f)) & 1) != 0;
        return (uRShift($this->bits[$offset],($x & 0x1f)) & 1) != 0;//было >>> вместо >>, не знаю как эмулировать беззнаковый сдвиг
    }

/**
 * Sets the given bit to true.
 *
 * @param $x; The horizontal component (i.e. which column)
 * @param $y; The vertical component (i.e. which row)
 */
 public function set($x, $y) {
 $offset = intval($y * $this->rowSize + ($x / 32));
 if(!isset($this->bits[$offset])){
 $this->bits[$offset] = 0;
 }
 //$this->bits[$offset] = $this->bits[$offset];

// if($this->bits[$offset]>200748364){
 //$this->bits= 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|= intval32bits(1 << ($x & 0x1f));
 $bob = $this->bits[$offset];
 $bob |= 1 << ($x & 0x1f);
 $this->bits[$offset] |= overflow32($bob);
 //$this->bits[$offset] = intval32bits($this->bits[$offset]);

//}
//16777216
    }

public function _unset($x, $y) {//было unset, php не позволяет использовать unset
 $offset = intval($y * $this->rowSize + ($x / 32));
 $this->bits[$offset] &= ~(1 << ($x & 0x1f));
 }

/**1 << (249 & 0x1f)
 * Flips the given bit.
 *
 * @param $x; The horizontal component (i.e. which column)
 * @param $y; The vertical component (i.e. which row)
 */
 public function flip($x, $y) {
 $offset = $y * $this->rowSize + intval($x / 32);

$this->bits[$offset] = overflow32($this->bits[$offset]^(1 << ($x & 0x1f)));
 }

/**
 * Exclusive-or (XOR): Flip the bit in this {@code BitMatrix} if the corresponding
 * mask bit is set.
 *
 * @param $mask; XOR mask
 */
 public function _xor($mask) {//было xor, php не позволяет использовать xor
 if ($this->width != $mask->getWidth() || $this->height != $mask->getHeight()
 || $this->rowSize != $mask->getRowSize()) {
 throw new \InvalidArgumentException("input matrix dimensions do not match");
 }
 $rowArray = new BitArray($this->width / 32 + 1);
 for ($y = 0; $y < $this->height; $y++) {
 $offset = $y * $this->rowSize;
 $row = $mask->getRow($y, $rowArray)->getBitArray();
 for ($x = 0; $x < $this->rowSize; $x++) {
 $this->bits[$offset + $x] ^= $row[$x];
 }
 }
 }

/**
 * Clears all bits (sets to false).
 */
 public function clear() {
 $max = count($this->bits);
 for ($i = 0; $i < $max; $i++) {
 $this->bits[$i] = 0;
 }
 }

/**
 * Sets a square region of the bit matrix to true.
 *
 * @param $left; The horizontal position to begin at (inclusive)
 * @param $top; The vertical position to begin at (inclusive)
 * @param $width; The width of the region
 * @param $height; The height of the region
 */
 public function setRegion($left, $top, $width, $height) {
 if ($top < 0 || $left < 0) {
 throw new \InvalidArgumentException("Left and top must be nonnegative");
 }
 if ($height < 1 || $width < 1) {
 throw new \InvalidArgumentException("Height and width must be at least 1");
 }
 $right = $left + $width;
 $bottom = $top + $height;
 if ($bottom > $this->height || $right > $this->width) { //> this.height || right > this.width
 throw new \InvalidArgumentException("The region must fit inside the matrix");
 }
 for ($y = $top; $y < $bottom; $y++) {
 $offset = $y * $this->rowSize;
 for ($x = $left; $x < $right; $x++) {
 $this->bits[$offset + intval($x / 32)] = overflow32($this->bits[$offset + intval($x / 32)]|= 1 << ($x & 0x1f));
 }
 }
 }

/**
 * A fast method to retrieve one row of data from the matrix as a BitArray.
 *
 * @param $y; The row to retrieve
 * @param $row; An optional caller-allocated BitArray, will be allocated if null or too small
 * @return The resulting BitArray - this reference should always be used even when passing
 * your own row
 */
 public function getRow($y, $row) {
 if ($row == null || $row->getSize() < $this->width) {
 $row = new BitArray($this->width);
 } else {
 $row->clear();
 }
 $offset = $y * $this->rowSize;
 for ($x = 0; $x < $this->rowSize; $x++) {
 $row->setBulk($x * 32, $this->bits[$offset + $x]);
 }
 return $row;
 }

/**
     * @param $y;  row to set
     * @param $row;  {@link BitArray} to copy from
     */
    public function setRow($y, $row) {
        $this->bits = arraycopy($row->getBitArray(), 0, $this->bits, $y * $this->rowSize, $this->rowSize);
    }

/**
 * Modifies this {@code BitMatrix} to represent the same but rotated 180 degrees
 */
 public function rotate180() {
 $width = $this->getWidth();
 $height = $this-getHeight();
 $topRow = new BitArray($width);
 $bottomRow = new BitArray($width);
 for ($i = 0; $i < ($height+1) / 2; $i++) {
 $topRow = $this->getRow($i, $topRow);
 $bottomRow = $this->getRow($height - 1 - $i, $bottomRow);
 $topRow->reverse();
 $bottomRow->reverse();
 $this->setRow($i, $bottomRow);
 $this->setRow($height - 1 - $i, $topRow);
 }
 }

/**
     * This is useful in detecting the enclosing rectangle of a 'pure' barcode.
     *
     * @return {@code left,top,width,height} enclosing rectangle of all 1 bits, or null if it is all white
     */
    public function getEnclosingRectangle() {
        $left = $this->width;
        $top = $this->height;
        $right = -1;
        $bottom = -1;

for ($y = 0; $y < $this->height; $y++) {
 for ($x32 = 0; $x32 < $this->rowSize; $x32++) {
 $theBits = $this->bits[$y * $this->rowSize + $x32];
 if ($theBits != 0) {
 if ($y < $top) {
 $top = $y;
 }
 if ($y > $bottom) {
 $bottom = $y;
 }
 if ($x32 * 32 < $left) {
 $bit = 0;
 while (($theBits << (31 - $bit)) == 0) {
 $bit++;
 }
 if (($x32 * 32 + $bit) < $left) {
 $left = $x32 * 32 + $bit;
 }
 }
 if ($x32 * 32 + 31 > $right) {
 $bit = 31;
 while ((sdvig3($theBits, $bit)) == 0) {//>>>
 $bit--;
 }
 if (($x32 * 32 + $bit) > $right) {
 $right = $x32 * 32 + $bit;
 }
 }
 }
 }
 }

$width = $right - $left;
        $height = $bottom - $top;

if ($width < 0 || $height < 0) {
 return null;
 }

return array($left, $top, $width, $height);
    }

/**
 * This is useful in detecting a corner of a 'pure' barcode.
 *
 * @return {@code x,y} coordinate of top-left-most 1 bit, or null if it is all white
 */
 public function getTopLeftOnBit() {
 $bitsOffset = 0;
 while ($bitsOffset < count($this->bits) && $this->bits[$bitsOffset] == 0) {
 $bitsOffset++;
 }
 if ($bitsOffset == count($this->bits)) {
 return null;
 }
 $y = $bitsOffset / $this->rowSize;
 $x = ($bitsOffset % $this->rowSize) * 32;

$theBits = $this->bits[$bitsOffset];
 $bit = 0;
 while (($theBits << (31-$bit)) == 0) {
 $bit++;
 }
 $x += $bit;
 return array($x, $y);
 }

public function getBottomRightOnBit() {
 $bitsOffset = count($this->bits) - 1;
 while ($bitsOffset >= 0 && $this->bits[$bitsOffset] == 0) {
 $bitsOffset--;
 }
 if ($bitsOffset < 0) {
 return null;
 }

$y = $bitsOffset / $this->rowSize;
        $x = ($bitsOffset % $this->rowSize) * 32;

$theBits = $this->bits[$bitsOffset];
        $bit = 31;
        while ((sdvig3($theBits, $bit)) == 0) {//>>>
            $bit--;
        }
        $x += $bit;

return array($x, $y);
    }

/**
     * @return The width of the matrix
     */
    public function getWidth() {
        return $this->width;
    }

/**
     * @return The height of the matrix
     */
    public function getHeight() {
        return $this->height;
    }

/**
     * @return The row size of the matrix
     */
    public function getRowSize() {
        return $this->rowSize;
    }

//@Override
    public function equals($o) {
        if (!($o instanceof BitMatrix)) {
            return false;
        }
        $other = $o;
        return $this->width == $other->width && $this->height == $other->height && $this->rowSize == $other->rowSize &&
        $this->bits===$other->bits;
    }

//@Override
    public function hashCode() {
        $hash = $this->width;
        $hash = 31 * $hash + $this->width;
        $hash = 31 * $hash + $this->height;
        $hash = 31 * $hash + $this->rowSize;
        $hash = 31 * $hash + hashCode($this->bits);
        return $hash;
    }

//@Override
    public function toString($setString='', $unsetString='',$lineSeparator='') {
        if(!$setString||!$unsetString){
            return (string)"X "."  ";
        }
        if($lineSeparator&&$lineSeparator!=="\n"){
            return $this->toString_($setString, $unsetString, $lineSeparator);
        }
        return (string)($setString. $unsetString. "\n");
    }

/**
 * @deprecated call {@link #toString(String,String)} only, which uses \n line separator always
 */
 // @Deprecated
 public function toString_($setString, $unsetString, $lineSeparator) {
 //$result = new StringBuilder(height * (width + 1));
 $result = '';
 for ($y = 0; $y < $this->height; $y++) {
 for ($x = 0; $x < $this->width; $x++) {
 $result .= ($this->get($x, $y) ? $setString : $unsetString);
 }
 $result .= ($lineSeparator);
 }
 return (string)$result;
 }

//  @Override
    public function _clone() {//clone()
        return new BitMatrix($this->width, $this->height, $this->rowSize, $this->bits);
    }

}

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