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/*
* Copyright (C) 2012 The CyanogenMod Project
*
* 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.cyanogenmod.filemanager.commands.shell;
import com.cyanogenmod.filemanager.commands.AsyncResultListener;
import com.cyanogenmod.filemanager.commands.ChecksumExecutable;
import com.cyanogenmod.filemanager.commands.SIGNAL;
import com.cyanogenmod.filemanager.console.CommandNotFoundException;
import com.cyanogenmod.filemanager.console.ExecutionException;
import com.cyanogenmod.filemanager.console.InsufficientPermissionsException;
import java.io.File;
/**
* A class for calculate MD5 and SHA-1 checksums of a file system object.<br />
* <br />
* Partial results are returned in order (MD5 -> SHA1)
*
* {@link "http://unixhelp.ed.ac.uk/CGI/man-cgi?md5sum"}
* {@link "http://unixhelp.ed.ac.uk/CGI/man-cgi?sha1sum"}
* @see com.cyanogenmod.filemanager.commands.ChecksumExecutable.CHECKSUMS
*/
public class ChecksumCommand extends AsyncResultProgram implements ChecksumExecutable {
private static final String ID = "checksum"; //$NON-NLS-1$
private final String mName;
private final String[] mChecksums;
private int mChecksumsCounter;
private String mPartial;
/**
* Constructor of <code>ChecksumCommand</code>.
*
* @param src The source file
* @param asyncResultListener The partial result listener
* @throws InvalidCommandDefinitionException If the command has an invalid definition
*/
public ChecksumCommand(String src, AsyncResultListener asyncResultListener)
throws InvalidCommandDefinitionException {
super(ID, asyncResultListener, src);
this.mChecksums = new String[]{null, null};
this.mName = new File(src).getName();
}
/**
* {@inheritDoc}
*/
@Override
public void onStartParsePartialResult() {
this.mChecksums[0] = null;
this.mChecksums[1] = null;
this.mChecksumsCounter = 0;
this.mPartial = ""; //$NON-NLS-1$
}
/**
* {@inheritDoc}
*/
@Override
public void onEndParsePartialResult(boolean cancelled) {
// Send the last partial data
if (this.mPartial != null && this.mPartial.length() > 0) {
if (getAsyncResultListener() != null) {
String data = processPartialResult(this.mPartial);
if (data != null) {
getAsyncResultListener().onPartialResult(data);
}
}
}
this.mPartial = ""; //$NON-NLS-1$
}
/**
* {@inheritDoc}
*/
@Override
public void onParsePartialResult(final byte[] in) {
String partialIn = new String(in);
if (partialIn == null || partialIn.length() == 0) return;
boolean endsWithNewLine = partialIn.endsWith("\n"); //$NON-NLS-1$
String[] lines = partialIn.split("\n"); //$NON-NLS-1$
// Append the pending data to the first line
lines[0] = this.mPartial + lines[0];
// Return all the lines, except the last
for (int i = 0; i < lines.length - 1; i++) {
if (getAsyncResultListener() != null) {
String data = processPartialResult(lines[i]);
if (data != null) {
getAsyncResultListener().onPartialResult(data);
}
}
}
// Return the last line?
if (endsWithNewLine) {
if (getAsyncResultListener() != null) {
String data = processPartialResult(lines[lines.length - 1]);
if (data != null) {
getAsyncResultListener().onPartialResult(data);
}
}
this.mPartial = ""; //$NON-NLS-1$
} else {
// Save the partial for next calls
this.mPartial = lines[lines.length - 1];
}
}
/**
* {@inheritDoc}
*/
@Override
public void onParseErrorPartialResult(byte[] partialErr) {/**NON BLOCK**/}
/**
* {@inheritDoc}
*/
@Override
public SIGNAL onRequestEnd() {
try {
if (this.getProgramListener().getOutputStream() != null) {
this.getProgramListener().getOutputStream().flush();
}
} catch (Exception ex) {/**NON BLOCK**/}
try {
Thread.yield();
} catch (Exception ex) {/**NON BLOCK**/}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public String[] getResult() {
return this.mChecksums;
}
/**
* {@inheritDoc}
*/
@Override
public String getChecksum(CHECKSUMS checksum) {
return getResult()[checksum.ordinal()];
}
/**
* Method that processes a line to determine if it's a valid partial result
*
* @param line The line to process
* @return String The processed line
*/
private String processPartialResult(String line) {
// MD5 and SHA-1 return both the digest and the name of the file
// 4c044b884cf2ff3839713da0e81dced19f099b09 boot.zip
int pos = line.indexOf(" "); //$NON-NLS-1$
if (line.endsWith(this.mName) && pos != -1) {
String digest = line.substring(0, pos).trim();
if (this.mChecksumsCounter < this.mChecksums.length) {
this.mChecksums[this.mChecksumsCounter] = digest;
}
this.mChecksumsCounter++;
return digest;
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public void checkExitCode(int exitCode)
throws InsufficientPermissionsException, CommandNotFoundException, ExecutionException {
//Ignore exit code 143 (cancelled)
//Ignore exit code 137 (kill -9)
if (exitCode != 0 && exitCode != 143 && exitCode != 137) {
throw new ExecutionException(
"exitcode != 0 && != 143 && != 137"); //$NON-NLS-1$
}
}
}
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