first commit

2020-08-06 14:58:51 +08:00
commit 17096657dc
780 changed files with 92857 additions and 0 deletions
--- a/vendor/khanamiryan/qrcode-detector-decoder/lib/common/BitSource.php
+++ b/vendor/khanamiryan/qrcode-detector-decoder/lib/common/BitSource.php
@@ -0,0 +1,112 @@
+<?php
+/*
+ * Copyright 2007 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.
+ */
+
+namespace Zxing\Common;
+
+/**
+ * <p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
+ * number of bits read is not often a multiple of 8.</p>
+ *
+ * <p>This class is thread-safe but not reentrant -- unless the caller modifies the bytes array
+ * it passed in, in which case all bets are off.</p>
+ *
+ * @author Sean Owen
+ */
+final class BitSource {
+
+  private $bytes;
+  private $byteOffset = 0;
+  private $bitOffset = 0;
+
+  /**
+   * @param bytes bytes from which this will read bits. Bits will be read from the first byte first.
+   * Bits are read within a byte from most-significant to least-significant bit.
+   */
+  public function __construct($bytes) {
+    $this->bytes = $bytes;
+  }
+
+  /**
+   * @return index of next bit in current byte which would be read by the next call to {@link #readBits(int)}.
+   */
+  public function getBitOffset() {
+    return $this->bitOffset;
+  }
+
+  /**
+   * @return index of next byte in input byte array which would be read by the next call to {@link #readBits(int)}.
+   */
+  public function getByteOffset() {
+    return $this->byteOffset;
+  }
+
+  /**
+   * @param numBits number of bits to read
+   * @return int representing the bits read. The bits will appear as the least-significant
+   *         bits of the int
+   * @throws IllegalArgumentException if numBits isn't in [1,32] or more than is available
+   */
+  public function readBits($numBits) {
+    if ($numBits < 1 || $numBits > 32 || $numBits > $this->available()) {
+      throw new \InvalidArgumentException(strval($numBits));
+    }
+
+    $result = 0;
+
+    // First, read remainder from current byte
+    if ($this->bitOffset > 0) {
+      $bitsLeft = 8 - $this->bitOffset;
+      $toRead = $numBits < $bitsLeft ? $numBits : $bitsLeft;
+      $bitsToNotRead = $bitsLeft - $toRead;
+      $mask = (0xFF >> (8 - $toRead)) << $bitsToNotRead;
+      $result = ($this->bytes[$this->byteOffset] & $mask) >> $bitsToNotRead;
+      $numBits -= $toRead;
+      $this->bitOffset += $toRead;
+      if ($this->bitOffset == 8) {
+        $this->bitOffset = 0;
+        $this->byteOffset++;
+      }
+    }
+
+    // Next read whole bytes
+    if ($numBits > 0) {
+      while ($numBits >= 8) {
+        $result = ($result << 8) | ($this->bytes[$this->byteOffset] & 0xFF);
+        $this->byteOffset++;
+        $numBits -= 8;
+      }
+
+      // Finally read a partial byte
+      if ($numBits > 0) {
+        $bitsToNotRead = 8 - $numBits;
+        $mask = (0xFF >> $bitsToNotRead) << $bitsToNotRead;
+        $result = ($result << $numBits) | (($this->bytes[$this->byteOffset] & $mask) >> $bitsToNotRead);
+        $this->bitOffset += $numBits;
+      }
+    }
+
+    return $result;
+  }
+
+  /**
+   * @return number of bits that can be read successfully
+   */
+  public function available() {
+    return 8 * (count($this->bytes) - $this->byteOffset) - $this->bitOffset;
+  }
+
+}