From 896d27de36dd26515f30fa3b0748c9c6089600af Mon Sep 17 00:00:00 2001
From: Bart Visscher <bartv@thisnet.nl>
Date: Fri, 27 Jul 2012 19:02:23 +0200
Subject: Chunked upload: Support reusing local chunks

---
 lib/filechunking.php | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

(limited to 'lib/filechunking.php')

diff --git a/lib/filechunking.php b/lib/filechunking.php
index 9aead4c12fb..d03af226d8b 100644
--- a/lib/filechunking.php
+++ b/lib/filechunking.php
@@ -23,9 +23,8 @@ class OC_FileChunking {
 	public function getPrefix() {
 		$name = $this->info['name'];
 		$transferid = $this->info['transferid'];
-		$chunkcount = $this->info['chunkcount'];
 
-		return $name.'-chunking-'.$transferid.'-'.$chunkcount.'-';
+		return $name.'-chunking-'.$transferid.'-';
 	}
 
 	protected function getCache() {
@@ -63,4 +62,33 @@ class OC_FileChunking {
 		}
 		fclose($f);
 	}
+
+	public function signature_split($orgfile, $input) {
+		$info = unpack('n', fread($input, 2));
+		$blocksize = $info[1];
+		$this->info['transferid'] = mt_rand();
+		$count = 0;
+		$needed = array();
+		$cache = $this->getCache();
+		$prefix = $this->getPrefix();
+		while (!feof($orgfile)) {
+			$new_md5 = fread($input, 16);
+			if (feof($input)) {
+				break;
+			}
+			$data = fread($orgfile, $blocksize);
+			$org_md5 = md5($data, true);
+			if ($org_md5 == $new_md5) {
+				$cache->set($prefix.$count, $data);
+			} else {
+				$needed[] = $count;
+			}
+			$count++;
+		}
+		return array(
+			'transferid' => $this->info['transferid'],
+			'needed' => $needed,
+			'count' => $count,
+		);
+	}
 }
-- 
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