Android Utililty Methods File Checksum

List of utility methods to do File Checksum

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Description

The list of methods to do File Checksum are organized into topic(s).

Method

voidchecksumFile(final Checksum chk, final String fname)
Computes the checksum of a given file and adds it to the provided Checksum object. 
BufferedInputStream bis = null;
FileInputStream fis = null;
try {
    fis = new FileInputStream(fname);
    bis = new BufferedInputStream(fis);
    int len = 0;
    byte[] bytes = new byte[8192];
    while ((len = bis.read(bytes)) >= 0) {
...
longcomputeChecksum(String path)
Returns the checksum of a given directory tree. 
String dir = getDir(path);
Checksum checksum = new CRC32();
checksumDir(checksum, dir);
return checksum.getValue();
StringgetChecksum(String filePath)
get Checksum 
FileInputStream file = new FileInputStream(filePath);
CheckedInputStream check = new CheckedInputStream(file, new CRC32());
BufferedInputStream in = new BufferedInputStream(check);
String checkSum = "";
while (in.read() != -1) {
if (in != null) {
    in.close();
...
booleanverifyChecksum(String path)
Computes the checksum of a given directory tree and verifies that it matches the checksum stored in a file at the root the that directory 
long checksum_long = computeChecksum(path);
byte[] checksum1 = String.valueOf(checksum_long).getBytes();
byte[] checksum2 = new byte[checksum1.length];
File f = new File(getDir(path), CHECKSUM_FILENAME);
if (!f.exists()) {
    throw new FileNotFoundException(
            "FileUtil.verifyChecksum: Missing checksum file in "
                    + path);
...
intcheckSum(File f)
check Sum 
long checksum = 0;
try {
    FileInputStream fileImg = new FileInputStream(f);
    do {
        byte[] block = new byte[2];
        int size = fileImg.read(block);
        if (size != 2) {
            break;
...