From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Thu, 8 Jan 2009 17:41:39 +0000 (-0700)
Subject: immutable: ValidatedExtendedURIProxy computes and stores the tail data size as a... 
X-Git-Url: https://git.rkrishnan.org/frontends/specifications/about.html?a=commitdiff_plain;h=7d15928faaa8d29f2b1c1b87a75f19cd036395e8;p=tahoe-lafs%2Ftahoe-lafs.git

immutable: ValidatedExtendedURIProxy computes and stores the tail data size as a convenience to its caller.
The "tail data size" is how many of the bytes of the tail segment are data (as opposed to padding).
---

diff --git a/src/allmydata/immutable/download.py b/src/allmydata/immutable/download.py
index 0f5a0f81..25b3adb6 100644
--- a/src/allmydata/immutable/download.py
+++ b/src/allmydata/immutable/download.py
@@ -204,6 +204,7 @@ class ValidatedExtendedURIProxy:
         self.block_size = None
         self.share_size = None
         self.num_segments = None
+        self.tail_data_size = None
         self.tail_segment_size = None
 
         # optional
@@ -246,11 +247,11 @@ class ValidatedExtendedURIProxy:
         self.block_size = mathutil.div_ceil(self.segment_size, self._verifycap.needed_shares)
         self.num_segments = mathutil.div_ceil(self._verifycap.size, self.segment_size)
 
-        tail_data_size = self._verifycap.size % self.segment_size
-        if not tail_data_size:
-            tail_data_size = self.segment_size
+        self.tail_data_size = self._verifycap.size % self.segment_size
+        if not self.tail_data_size:
+            self.tail_data_size = self.segment_size
         # padding for erasure code
-        self.tail_segment_size = mathutil.next_multiple(tail_data_size, self._verifycap.needed_shares)
+        self.tail_segment_size = mathutil.next_multiple(self.tail_data_size, self._verifycap.needed_shares)
 
         # Ciphertext hash tree root is mandatory, so that there is at most one ciphertext that
         # matches this read-cap or verify-cap.  The integrity check on the shares is not