itextpdf.jar is a component in iText 5 Java library to provide core functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided at iText GitHub site.

You can compile it to generate your JAR file, using pom.xml as the build configuration file.

The source code of itextpdf-5.5.14.jar is provided below:

⏎ com/itextpdf/text/pdf/qrcode/BitVector.java

/*
 * 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.itextpdf.text.pdf.qrcode;

/**
 * JAVAPORT: This should be combined with BitArray in the future, although that class is not yet
 * dynamically resizeable. This implementation is reasonable but there is a lot of function calling
 * in loops I'd like to get rid of.
 *
 * @author satorux@google.com (Satoru Takabayashi) - creator
 * @author dswitkin@google.com (Daniel Switkin) - ported from C++
 * @since 5.0.2
 */
public final class BitVector {

  private int sizeInBits;
  private byte[] array;

  // For efficiency, start out with some room to work.
  private static final int DEFAULT_SIZE_IN_BYTES = 32;

  public BitVector() {
    sizeInBits = 0;
    array = new byte[DEFAULT_SIZE_IN_BYTES];
  }

  // Return the bit value at "index".
  public int at(int index) {
    if (index < 0 || index >= sizeInBits) {
      throw new IllegalArgumentException("Bad index: " + index);
    }
    int value = array[index >> 3] & 0xff;
    return (value >> (7 - (index & 0x7))) & 1;
  }

  // Return the number of bits in the bit vector.
  public int size() {
    return sizeInBits;
  }

  // Return the number of bytes in the bit vector.
  public int sizeInBytes() {
    return (sizeInBits + 7) >> 3;
  }

  // Append one bit to the bit vector.
  public void appendBit(int bit) {
    if (!(bit == 0 || bit == 1)) {
      throw new IllegalArgumentException("Bad bit");
    }
    int numBitsInLastByte = sizeInBits & 0x7;
    // We'll expand array if we don't have bits in the last byte.
    if (numBitsInLastByte == 0) {
      appendByte(0);
      sizeInBits -= 8;
    }
    // Modify the last byte.
    array[sizeInBits >> 3] |= (bit << (7 - numBitsInLastByte));
    ++sizeInBits;
  }

  // Append "numBits" bits in "value" to the bit vector.
  // REQUIRES: 0<= numBits <= 32.
  //
  // Examples:
  // - appendBits(0x00, 1) adds 0.
  // - appendBits(0x00, 4) adds 0000.
  // - appendBits(0xff, 8) adds 11111111.
  public void appendBits(int value, int numBits) {
    if (numBits < 0 || numBits > 32) {
      throw new IllegalArgumentException("Num bits must be between 0 and 32");
    }
    int numBitsLeft = numBits;
    while (numBitsLeft > 0) {
      // Optimization for byte-oriented appending.
      if ((sizeInBits & 0x7) == 0 && numBitsLeft >= 8) {
        int newByte = (value >> (numBitsLeft - 8)) & 0xff;
        appendByte(newByte);
        numBitsLeft -= 8;
      } else {
        int bit = (value >> (numBitsLeft - 1)) & 1;
        appendBit(bit);
        --numBitsLeft;
      }
    }
  }

  // Append "bits".
  public void appendBitVector(BitVector bits) {
    int size = bits.size();
    for (int i = 0; i < size; ++i) {
      appendBit(bits.at(i));
    }
  }

  // Modify the bit vector by XOR'ing with "other"
  public void xor(BitVector other) {
    if (sizeInBits != other.size()) {
      throw new IllegalArgumentException("BitVector sizes don't match");
    }
    int sizeInBytes = (sizeInBits + 7) >> 3;
    for (int i = 0; i < sizeInBytes; ++i) {
      // The last byte could be incomplete (i.e. not have 8 bits in
      // it) but there is no problem since 0 XOR 0 == 0.
      array[i] ^= other.array[i];
    }
  }

  // Return String like "01110111" for debugging.
  public String toString() {
    StringBuffer result = new StringBuffer(sizeInBits);
    for (int i = 0; i < sizeInBits; ++i) {
      if (at(i) == 0) {
        result.append('0');
      } else if (at(i) == 1) {
        result.append('1');
      } else {
        throw new IllegalArgumentException("Byte isn't 0 or 1");
      }
    }
    return result.toString();
  }

  // Callers should not assume that array.length is the exact number of bytes needed to hold
  // sizeInBits - it will typically be larger for efficiency.
  public byte[] getArray() {
    return array;
  }

  // Add a new byte to the end, possibly reallocating and doubling the size of the array if we've
  // run out of room.
  private void appendByte(int value) {
    if ((sizeInBits >> 3) == array.length) {
      byte[] newArray = new byte[(array.length << 1)];
      System.arraycopy(array, 0, newArray, 0, array.length);
      array = newArray;
    }
    array[sizeInBits >> 3] = (byte) value;
    sizeInBits += 8;
  }

}

⏎ com/itextpdf/text/pdf/qrcode/BitVector.java

Or download all of them as a single archive file:

File name: itextpdf-5.5.14-fyi.zip
File size: 2163839 bytes
Release date: 2009-10-09
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