From d6039f9e73d440f1e49ac880f5017cb6aaf4546e Mon Sep 17 00:00:00 2001
From: Michael Vogt <michael.vogt@ubuntu.com>
Date: Fri, 5 Oct 2007 07:48:13 +0200
Subject: methods/https.cc: - delete zero size I-M-S hits - fix of-by-one error
 in I-M-S code

---
 debian/changelog |  3 ++-
 methods/https.cc | 26 +++++++++++++-------------
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 7687fce5a..d43fb9861 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -7,9 +7,10 @@ apt (0.7.7) UNRELEASED; urgency=low
   * apt-pkg/acquire-item.cc:
     - remove zero size files on I-M-S hit
   * methods/https.cc:
-    - only send LastModified if we actually have one
+    - only send LastModified if we actually have a file
     - send range request with if-range 
     - delete failed downloads
+    - delete zero size I-M-S hits
   * apt-pkg/deb/dpkgpm.{cc,h}:
     - merged dpkg-log branch, this lets you specify a 
       Dir::Log::Terminal file to log dpkg output to
diff --git a/methods/https.cc b/methods/https.cc
index 3b2b0bb19..b2bbbddb1 100644
--- a/methods/https.cc
+++ b/methods/https.cc
@@ -161,13 +161,6 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    }
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 
-   // set time values
-   if(Itm->LastModified > 0)
-   {
-      curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
-      curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
-   }
-
    // speed limit
    int dlLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024;
    if (dlLimit > 0)
@@ -183,7 +176,7 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    // error handling
    curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 
-   // In this case we send an if-range query with a range header
+   // if we have the file send an if-range query with a range header
    if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
    {
       char Buf[1000];
@@ -191,11 +184,17 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
 	      (long)SBuf.st_size - 1,
 	      TimeRFC1123(SBuf.st_mtime).c_str());
       headers = curl_slist_append(headers, Buf);
+   } 
+   else if(Itm->LastModified > 0)
+   {
+      curl_easy_setopt(curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
+      curl_easy_setopt(curl, CURLOPT_TIMEVALUE, Itm->LastModified);
    }
 
    // go for it - if the file exists, append on it
    File = new FileFd(Itm->DestFile, FileFd::WriteAny);
-   File->Seek(File->Size());
+   if (File->Size() > 0)
+      File->Seek(File->Size() - 1);
    
    // keep apt updated
    Res.Filename = Itm->DestFile;
@@ -217,9 +216,6 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    }
    File->Close();
 
-   if (Res.Size == 0)
-      Res.Size = File->Size();
-
    // Timestamp
    struct utimbuf UBuf;
    if (curl_servdate != -1) {
@@ -232,15 +228,19 @@ bool HttpsMethod::Fetch(FetchItem *Itm)
    struct stat Buf;
    if (stat(File->Name().c_str(),&Buf) == 0)
    {
-      Res.Size = Buf.st_size;
       Res.Filename = File->Name();
       Res.LastModified = Buf.st_mtime;
       Res.IMSHit = false;
       if (curl_responsecode == 304)
       {
+	 unlink(File->Name().c_str());
 	 Res.IMSHit = true;
 	 Res.LastModified = Itm->LastModified;
+	 Res.Size = 0;
+	 URIDone(Res);
+	 return true;
       }
+      Res.Size = Buf.st_size;
    }
 
    // take hashes
-- 
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