Android Open Source - wototoplayer Strict Line Reader






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Back to project page wototoplayer.

License

The source code is released under:

Copyright (c) 2015, Chris Greenhalgh All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met...

If you think the Android project wototoplayer listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 */*w  w  w .ja  va2s .c o m*/
 * 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.squareup.okhttp.internal;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

/**
 * Buffers input from an {@link InputStream} for reading lines.
 *
 * <p>This class is used for buffered reading of lines. For purposes of this class, a line ends with
 * "\n" or "\r\n". End of input is reported by throwing {@code EOFException}. Unterminated line at
 * end of input is invalid and will be ignored, the caller may use {@code hasUnterminatedLine()}
 * to detect it after catching the {@code EOFException}.
 *
 * <p>This class is intended for reading input that strictly consists of lines, such as line-based
 * cache entries or cache journal. Unlike the {@link java.io.BufferedReader} which in conjunction
 * with {@link java.io.InputStreamReader} provides similar functionality, this class uses different
 * end-of-input reporting and a more restrictive definition of a line.
 *
 * <p>This class supports only charsets that encode '\r' and '\n' as a single byte with value 13
 * and 10, respectively, and the representation of no other character contains these values.
 * We currently check in constructor that the charset is one of US-ASCII, UTF-8 and ISO-8859-1.
 * The default charset is US_ASCII.
 */
public class StrictLineReader implements Closeable {
  private static final byte CR = (byte) '\r';
  private static final byte LF = (byte) '\n';

  private final InputStream in;
  private final Charset charset;

  /*
   * Buffered data is stored in {@code buf}. As long as no exception occurs, 0 <= pos <= end
   * and the data in the range [pos, end) is buffered for reading. At end of input, if there is
   * an unterminated line, we set end == -1, otherwise end == pos. If the underlying
   * {@code InputStream} throws an {@code IOException}, end may remain as either pos or -1.
   */
  private byte[] buf;
  private int pos;
  private int end;

  /**
   * Constructs a new {@code LineReader} with the specified charset and the default capacity.
   *
   * @param in the {@code InputStream} to read data from.
   * @param charset the charset used to decode data. Only US-ASCII, UTF-8 and ISO-8859-1 are
   *     supported.
   * @throws NullPointerException if {@code in} or {@code charset} is null.
   * @throws IllegalArgumentException if the specified charset is not supported.
   */
  public StrictLineReader(InputStream in, Charset charset) {
    this(in, 8192, charset);
  }

  /**
   * Constructs a new {@code LineReader} with the specified capacity and charset.
   *
   * @param in the {@code InputStream} to read data from.
   * @param capacity the capacity of the buffer.
   * @param charset the charset used to decode data. Only US-ASCII, UTF-8 and ISO-8859-1 are
   *     supported.
   * @throws NullPointerException if {@code in} or {@code charset} is null.
   * @throws IllegalArgumentException if {@code capacity} is negative or zero
   *     or the specified charset is not supported.
   */
  public StrictLineReader(InputStream in, int capacity, Charset charset) {
    if (in == null || charset == null) {
      throw new NullPointerException();
    }
    if (capacity < 0) {
      throw new IllegalArgumentException("capacity <= 0");
    }
    if (!(charset.equals(Util.US_ASCII))) {
      throw new IllegalArgumentException("Unsupported encoding");
    }

    this.in = in;
    this.charset = charset;
    buf = new byte[capacity];
  }

  /**
   * Closes the reader by closing the underlying {@code InputStream} and
   * marking this reader as closed.
   *
   * @throws IOException for errors when closing the underlying {@code InputStream}.
   */
  public void close() throws IOException {
    synchronized (in) {
      if (buf != null) {
        buf = null;
        in.close();
      }
    }
  }

  /**
   * Reads the next line. A line ends with {@code "\n"} or {@code "\r\n"},
   * this end of line marker is not included in the result.
   *
   * @return the next line from the input.
   * @throws IOException for underlying {@code InputStream} errors.
   * @throws EOFException for the end of source stream.
   */
  public String readLine() throws IOException {
    synchronized (in) {
      if (buf == null) {
        throw new IOException("LineReader is closed");
      }

      // Read more data if we are at the end of the buffered data.
      // Though it's an error to read after an exception, we will let {@code fillBuf()}
      // throw again if that happens; thus we need to handle end == -1 as well as end == pos.
      if (pos >= end) {
        fillBuf();
      }
      // Try to find LF in the buffered data and return the line if successful.
      for (int i = pos; i != end; ++i) {
        if (buf[i] == LF) {
          int lineEnd = (i != pos && buf[i - 1] == CR) ? i - 1 : i;
          String res = new String(buf, pos, lineEnd - pos, charset.name());
          pos = i + 1;
          return res;
        }
      }

      // Let's anticipate up to 80 characters on top of those already read.
      ByteArrayOutputStream out = new ByteArrayOutputStream(end - pos + 80) {
        @Override public String toString() {
          int length = (count > 0 && buf[count - 1] == CR) ? count - 1 : count;
          try {
            return new String(buf, 0, length, charset.name());
          } catch (UnsupportedEncodingException e) {
            throw new AssertionError(e); // Since we control the charset this will never happen.
          }
        }
      };

      while (true) {
        out.write(buf, pos, end - pos);
        // Mark unterminated line in case fillBuf throws EOFException or IOException.
        end = -1;
        fillBuf();
        // Try to find LF in the buffered data and return the line if successful.
        for (int i = pos; i != end; ++i) {
          if (buf[i] == LF) {
            if (i != pos) {
              out.write(buf, pos, i - pos);
            }
            pos = i + 1;
            return out.toString();
          }
        }
      }
    }
  }

  /**
   * Read an {@code int} from a line containing its decimal representation.
   *
   * @return the value of the {@code int} from the next line.
   * @throws IOException for underlying {@code InputStream} errors or conversion error.
   * @throws EOFException for the end of source stream.
   */
  public int readInt() throws IOException {
    String intString = readLine();
    try {
      return Integer.parseInt(intString);
    } catch (NumberFormatException e) {
      throw new IOException("expected an int but was \"" + intString + "\"");
    }
  }

  /**
   * Reads new input data into the buffer. Call only with pos == end or end == -1,
   * depending on the desired outcome if the function throws.
   */
  private void fillBuf() throws IOException {
    int result = in.read(buf, 0, buf.length);
    if (result == -1) {
      throw new EOFException();
    }
    pos = 0;
    end = result;
  }
}




Java Source Code List

com.phonegap.plugins.barcodescanner.BarcodeScanner.java
com.squareup.okhttp.Address.java
com.squareup.okhttp.ConnectionPool.java
com.squareup.okhttp.Connection.java
com.squareup.okhttp.Dispatcher.java
com.squareup.okhttp.Failure.java
com.squareup.okhttp.HttpResponseCache.java
com.squareup.okhttp.Job.java
com.squareup.okhttp.MediaType.java
com.squareup.okhttp.OkAuthenticator.java
com.squareup.okhttp.OkHttpClient.java
com.squareup.okhttp.OkResponseCache.java
com.squareup.okhttp.Request.java
com.squareup.okhttp.ResponseSource.java
com.squareup.okhttp.Response.java
com.squareup.okhttp.RouteDatabase.java
com.squareup.okhttp.Route.java
com.squareup.okhttp.TunnelRequest.java
com.squareup.okhttp.internal.AbstractOutputStream.java
com.squareup.okhttp.internal.Base64.java
com.squareup.okhttp.internal.DiskLruCache.java
com.squareup.okhttp.internal.Dns.java
com.squareup.okhttp.internal.FaultRecoveringOutputStream.java
com.squareup.okhttp.internal.NamedRunnable.java
com.squareup.okhttp.internal.Platform.java
com.squareup.okhttp.internal.StrictLineReader.java
com.squareup.okhttp.internal.Util.java
com.squareup.okhttp.internal.http.AbstractHttpInputStream.java
com.squareup.okhttp.internal.http.HeaderParser.java
com.squareup.okhttp.internal.http.HttpAuthenticator.java
com.squareup.okhttp.internal.http.HttpDate.java
com.squareup.okhttp.internal.http.HttpEngine.java
com.squareup.okhttp.internal.http.HttpTransport.java
com.squareup.okhttp.internal.http.HttpURLConnectionImpl.java
com.squareup.okhttp.internal.http.HttpsEngine.java
com.squareup.okhttp.internal.http.HttpsURLConnectionImpl.java
com.squareup.okhttp.internal.http.OkResponseCacheAdapter.java
com.squareup.okhttp.internal.http.Policy.java
com.squareup.okhttp.internal.http.RawHeaders.java
com.squareup.okhttp.internal.http.RequestHeaders.java
com.squareup.okhttp.internal.http.ResponseHeaders.java
com.squareup.okhttp.internal.http.RetryableOutputStream.java
com.squareup.okhttp.internal.http.RouteSelector.java
com.squareup.okhttp.internal.http.SpdyTransport.java
com.squareup.okhttp.internal.http.Transport.java
com.squareup.okhttp.internal.http.UnknownLengthHttpInputStream.java
com.squareup.okhttp.internal.spdy.ErrorCode.java
com.squareup.okhttp.internal.spdy.FrameReader.java
com.squareup.okhttp.internal.spdy.FrameWriter.java
com.squareup.okhttp.internal.spdy.HeadersMode.java
com.squareup.okhttp.internal.spdy.Hpack.java
com.squareup.okhttp.internal.spdy.Http20Draft06.java
com.squareup.okhttp.internal.spdy.IncomingStreamHandler.java
com.squareup.okhttp.internal.spdy.NameValueBlockReader.java
com.squareup.okhttp.internal.spdy.Ping.java
com.squareup.okhttp.internal.spdy.Settings.java
com.squareup.okhttp.internal.spdy.Spdy3.java
com.squareup.okhttp.internal.spdy.SpdyConnection.java
com.squareup.okhttp.internal.spdy.SpdyStream.java
com.squareup.okhttp.internal.spdy.Variant.java
com.squareup.okhttp.internal.tls.DistinguishedNameParser.java
com.squareup.okhttp.internal.tls.OkHostnameVerifier.java
org.apache.cordova.App.java
org.apache.cordova.AuthenticationToken.java
org.apache.cordova.CallbackContext.java
org.apache.cordova.ConfigXmlParser.java
org.apache.cordova.Config.java
org.apache.cordova.CordovaActivity.java
org.apache.cordova.CordovaArgs.java
org.apache.cordova.CordovaBridge.java
org.apache.cordova.CordovaChromeClient.java
org.apache.cordova.CordovaInterface.java
org.apache.cordova.CordovaPlugin.java
org.apache.cordova.CordovaPreferences.java
org.apache.cordova.CordovaResourceApi.java
org.apache.cordova.CordovaUriHelper.java
org.apache.cordova.CordovaWebViewClient.java
org.apache.cordova.CordovaWebView.java
org.apache.cordova.DirectoryManager.java
org.apache.cordova.DroidGap.java
org.apache.cordova.ExifHelper.java
org.apache.cordova.ExposedJsApi.java
org.apache.cordova.FileHelper.java
org.apache.cordova.IceCreamCordovaWebViewClient.java
org.apache.cordova.JSONUtils.java
org.apache.cordova.LOG.java
org.apache.cordova.LinearLayoutSoftKeyboardDetect.java
org.apache.cordova.NativeToJsMessageQueue.java
org.apache.cordova.PluginEntry.java
org.apache.cordova.PluginManager.java
org.apache.cordova.PluginResult.java
org.apache.cordova.ScrollEvent.java
org.apache.cordova.Whitelist.java
org.opensharingtoolkit.cordova.aestheticodes.Scan.java
org.opensharingtoolkit.cordova.aestheticodes.Scan.java
org.opensharingtoolkit.player.CordovaApp.java