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Crypto hashing can now skip into a file before it starts

This commit is contained in:
nathan 2017-10-20 21:59:49 +02:00
parent 5388dcedd7
commit 031e027ed4
1 changed files with 9 additions and 3 deletions
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12
src/dorkbox/util/crypto/Crypto.java
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@ -118,7 +118,7 @@ class Crypto {
*/
public static
byte[] hashFile(File file, Digest digest, Logger logger) {
return hashFile(file, digest, 0L, logger);
return hashFile(file, digest, 0L, file.length(), logger);
}
/**
@ -128,12 +128,18 @@ class Crypto {
* may be null, if no log output is necessary
*/
public static
byte[] hashFile(File file, Digest digest, long lengthFromEnd, Logger logger) {
byte[] hashFile(File file, Digest digest, long startPosition, long endPosition, Logger logger) {
if (file.isFile() && file.canRead()) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
long size = file.length();
long skip = inputStream.skip(startPosition);
if (skip != startPosition) {
throw new RuntimeException("Unable to skip " + startPosition + " bytes. Only skippped " + skip + " instead");
}
long size = file.length() - startPosition;
long lengthFromEnd = size - endPosition;
if (lengthFromEnd > 0 && lengthFromEnd < size) {
size -= lengthFromEnd;