support hashes for compressed pdiff files

[apt.git] / apt-pkg / acquire-item.h

diff --git a/apt-pkg/acquire-item.h b/apt-pkg/acquire-item.h
index e6a22ce7b7ec92ec6113aefab23e8dec868ee348..910e4131bd21ee069625460c8db3f4556baec9c8 100644 (file)
--- a/apt-pkg/acquire-item.h
+++ b/apt-pkg/acquire-item.h
@@ -6,15 +6,15 @@
    Acquire Item - Item to acquire
 
    When an item is instantiated it will add it self to the local list in
    Acquire Item - Item to acquire
 
    When an item is instantiated it will add it self to the local list in

-   the Owner Acquire class. Derived classes will then call QueueURI to 
-   register all the URI's they wish to fetch at the initial moment.   
-   
+   the Owner Acquire class. Derived classes will then call QueueURI to
+   register all the URI's they wish to fetch at the initial moment.
+

    Three item classes are provided to provide functionality for
    downloading of Index, Translation and Packages files.
    Three item classes are provided to provide functionality for
    downloading of Index, Translation and Packages files.

-   
+

    A Archive class is provided for downloading .deb files. It does Hash
    checking and source location as well as a retry algorithm.
    A Archive class is provided for downloading .deb files. It does Hash
    checking and source location as well as a retry algorithm.

-   
+

    ##################################################################### */
                                                                        /*}}}*/
 #ifndef PKGLIB_ACQUIRE_ITEM_H
    ##################################################################### */
                                                                        /*}}}*/
 #ifndef PKGLIB_ACQUIRE_ITEM_H


@@ -49,7 +49,48 @@ class pkgSourceList;
 class IndexTarget;
 class pkgAcqMetaBase;
 
 class IndexTarget;
 class pkgAcqMetaBase;
 

-/** \brief Represents the process by which a pkgAcquire object should  {{{
+class APT_HIDDEN IndexTarget                                           /*{{{*/
+/** \brief Information about an index file. */
+{
+   public:
+   /** \brief A URI from which the index file can be downloaded. */
+   std::string const URI;
+
+   /** \brief A description of the index file. */
+   std::string const Description;
+
+   /** \brief A shorter description of the index file. */
+   std::string const ShortDesc;
+
+   /** \brief The key by which this index file should be
+    *  looked up within the meta signature file.
+    */
+   std::string const MetaKey;
+
+   virtual bool IsOptional() const {
+      return false;
+   }
+
+   IndexTarget(std::string const &MetaKey, std::string const &ShortDesc,
+        std::string const &LongDesc, std::string const &URI) :
+      URI(URI), Description(LongDesc), ShortDesc(ShortDesc), MetaKey(MetaKey) {}
+};
+                                                                       /*}}}*/
+class APT_HIDDEN OptionalIndexTarget : public IndexTarget              /*{{{*/
+/** \brief Information about an optional index file. */
+{
+   public:
+   virtual bool IsOptional() const {
+      return true;
+   }
+
+   OptionalIndexTarget(std::string const &MetaKey, std::string const &ShortDesc,
+        std::string const &LongDesc, std::string const &URI) :
+      IndexTarget(MetaKey, ShortDesc, LongDesc, URI) {}
+};
+                                                                       /*}}}*/
+class pkgAcquire::Item : public WeakPointable                          /*{{{*/
+/** \brief Represents the process by which a pkgAcquire object should

  *  retrieve a file or a collection of files.
  *
  *  By convention, Item subclasses should insert themselves into the
  *  retrieve a file or a collection of files.
  *
  *  By convention, Item subclasses should insert themselves into the


@@ -61,37 +102,7 @@ class pkgAcqMetaBase;
  *
  *  \see pkgAcquire
  */
  *
  *  \see pkgAcquire
  */

-class pkgAcquire::Item : public WeakPointable
-{  
-   void *d;
-
-   protected:
-   
-   /** \brief The acquire object with which this item is associated. */
-   pkgAcquire *Owner;
-
-   /** \brief Insert this item into its owner's queue.
-    *
-    *  \param Item Metadata about this item (its URI and
-    *  description).
-    */
-   inline void QueueURI(ItemDesc &Item)
-                 {Owner->Enqueue(Item);};
-
-   /** \brief Remove this item from its owner's queue. */
-   inline void Dequeue() {Owner->Dequeue(this);};
-   
-   /** \brief Rename a file without modifying its timestamp.
-    *
-    *  Many item methods call this as their final action.
-    *
-    *  \param From The file to be renamed.
-    *
-    *  \param To The new name of \a From.  If \a To exists it will be
-    *  overwritten.
-    */
-   bool Rename(std::string From,std::string To);
-
+{

    public:
 
    /** \brief The current status of this item. */
    public:
 
    /** \brief The current status of this item. */


@@ -116,7 +127,7 @@ class pkgAcquire::Item : public WeakPointable
        */
        StatAuthError,
 
        */
        StatAuthError,
 

-       /** \brief The item was could not be downloaded because of 
+       /** \brief The item was could not be downloaded because of

        *  a transient network error (e.g. network down)
        */
        StatTransientNetworkError,
        *  a transient network error (e.g. network down)
        */
        StatTransientNetworkError,


@@ -144,11 +155,11 @@ class pkgAcquire::Item : public WeakPointable
    std::string ActiveSubprocess;
 
    /** \brief A client-supplied unique identifier.
    std::string ActiveSubprocess;
 
    /** \brief A client-supplied unique identifier.

-    * 
+    *

     *  This field is initalized to 0; it is meant to be filled in by
     *  clients that wish to use it to uniquely identify items.
     *
     *  This field is initalized to 0; it is meant to be filled in by
     *  clients that wish to use it to uniquely identify items.
     *

-    *  \todo it's unused in apt itself
+    *  APT progress reporting will store an ID there as shown in "Get:42 …"

     */
    unsigned long ID;
 
     */
    unsigned long ID;
 


@@ -164,6 +175,7 @@ class pkgAcquire::Item : public WeakPointable
     *  download progress indicator's overall statistics.
     */
    bool Local;
     *  download progress indicator's overall statistics.
     */
    bool Local;

+

    std::string UsedMirror;
 
    /** \brief The number of fetch queues into which this item has been
    std::string UsedMirror;
 
    /** \brief The number of fetch queues into which this item has been


@@ -176,9 +188,6 @@ class pkgAcquire::Item : public WeakPointable
     */
    unsigned int QueueCounter;
 
     */
    unsigned int QueueCounter;
 

-   /** \brief TransactionManager */
-   pkgAcqMetaBase *TransactionManager;
-

    /** \brief The number of additional fetch items that are expected
     *  once this item is done.
     *
    /** \brief The number of additional fetch items that are expected
     *  once this item is done.
     *


@@ -188,15 +197,12 @@ class pkgAcquire::Item : public WeakPointable
     *  progress.
     */
    unsigned int ExpectedAdditionalItems;
     *  progress.
     */
    unsigned int ExpectedAdditionalItems;

-   
+

    /** \brief The name of the file into which the retrieved object
     *  will be written.
     */
    std::string DestFile;
 
    /** \brief The name of the file into which the retrieved object
     *  will be written.
     */
    std::string DestFile;
 

-   /** \brief storge name until a transaction is finished */
-   std::string PartialFile;
-

    /** \brief Invoked by the acquire worker when the object couldn't
     *  be fetched.
     *
    /** \brief Invoked by the acquire worker when the object couldn't
     *  be fetched.
     *


@@ -210,7 +216,7 @@ class pkgAcquire::Item : public WeakPointable
     *
     *  \sa pkgAcqMethod
     */
     *
     *  \sa pkgAcqMethod
     */

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);

 
    /** \brief Invoked by the acquire worker when the object was
     *  fetched successfully.
 
    /** \brief Invoked by the acquire worker when the object was
     *  fetched successfully.


@@ -225,25 +231,24 @@ class pkgAcquire::Item : public WeakPointable
     *
     *  \param Message Data from the acquire method.  Use LookupTag()
     *  to parse it.
     *
     *  \param Message Data from the acquire method.  Use LookupTag()
     *  to parse it.

-    *  \param Size The size of the object that was fetched.

     *  \param Hashes The HashSums of the object that was fetched.
     *  \param Cnf The method via which the object was fetched.
     *
     *  \sa pkgAcqMethod
     */
     *  \param Hashes The HashSums of the object that was fetched.
     *  \param Cnf The method via which the object was fetched.
     *
     *  \sa pkgAcqMethod
     */

-   virtual void Done(std::string Message, unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);

 
    /** \brief Invoked when the worker starts to fetch this object.
     *
     *  \param Message RFC822-formatted data from the worker process.
     *  Use LookupTag() to parse it.
     *
 
    /** \brief Invoked when the worker starts to fetch this object.
     *
     *  \param Message RFC822-formatted data from the worker process.
     *  Use LookupTag() to parse it.
     *

-    *  \param Size The size of the object being fetched.
+    *  \param Hashes The expected hashes of the object being fetched.

     *
     *  \sa pkgAcqMethod
     */
     *
     *  \sa pkgAcqMethod
     */

-   virtual void Start(std::string Message,unsigned long long Size);
+   virtual void Start(std::string const &Message, unsigned long long const Size);

 
    /** \brief Custom headers to be sent to the fetch process.
     *
 
    /** \brief Custom headers to be sent to the fetch process.
     *


@@ -253,46 +258,55 @@ class pkgAcquire::Item : public WeakPointable
     *  line, so they should (if nonempty) have a leading newline and
     *  no trailing newline.
     */
     *  line, so they should (if nonempty) have a leading newline and
     *  no trailing newline.
     */

-   virtual std::string Custom600Headers() const {return std::string();};
+   virtual std::string Custom600Headers() const;

 
    /** \brief A "descriptive" URI-like string.
     *
     *  \return a URI that should be used to describe what is being fetched.
     */
 
    /** \brief A "descriptive" URI-like string.
     *
     *  \return a URI that should be used to describe what is being fetched.
     */

-   virtual std::string DescURI() = 0;
+   virtual std::string DescURI() const = 0;

    /** \brief Short item description.
     *
     *  \return a brief description of the object being fetched.
     */
    /** \brief Short item description.
     *
     *  \return a brief description of the object being fetched.
     */

-   virtual std::string ShortDesc() {return DescURI();}
+   virtual std::string ShortDesc() const;

 
    /** \brief Invoked by the worker when the download is completely done. */
 
    /** \brief Invoked by the worker when the download is completely done. */

-   virtual void Finished() {};
-   
-   /** \brief HashSums
+   virtual void Finished();
+
+   /** \return HashSums the DestFile is supposed to have in this stage */
+   virtual HashStringList GetExpectedHashes() const = 0;
+   /** \return the 'best' hash for display proposes like --print-uris */
+   std::string HashSum() const;
+
+   /** \return if having no hashes is a hard failure or not

     *
     *

-    *  \return the HashSums of this object, if applicable; otherwise, an
-    *  empty list.
+    * Idealy this is always \b true for every subclass, but thanks to
+    * historical grow we don't have hashes for all files in all cases
+    * in all steps, so it is slightly more complicated than it should be.

     */
     */

-   HashStringList HashSums() const {return ExpectedHashes;};
-   std::string HashSum() const {HashStringList const hashes = HashSums(); HashString const * const hs = hashes.find(NULL); return hs != NULL ? hs->toStr() : ""; };
+   virtual bool HashesRequired() const { return true; }

 
    /** \return the acquire process with which this item is associated. */
 
    /** \return the acquire process with which this item is associated. */

-   pkgAcquire *GetOwner() const {return Owner;};
+   pkgAcquire *GetOwner() const;

 
    /** \return \b true if this object is being fetched from a trusted source. */
 
    /** \return \b true if this object is being fetched from a trusted source. */

-   virtual bool IsTrusted() const {return false;};
-   
-   // report mirror problems
+   virtual bool IsTrusted() const;
+

    /** \brief Report mirror problem
    /** \brief Report mirror problem

-    * 
+    *

     *  This allows reporting mirror failures back to a centralized
     *  server. The apt-report-mirror-failure script is called for this
     *  This allows reporting mirror failures back to a centralized
     *  server. The apt-report-mirror-failure script is called for this

-    * 
+    *

     *  \param FailCode A short failure string that is send
     */
     *  \param FailCode A short failure string that is send
     */

-   void ReportMirrorFailure(std::string FailCode);
+   void ReportMirrorFailure(std::string const &FailCode);

 
 

+   /** \brief Set the name of the current active subprocess
+    *
+    *  See also #ActiveSubprocess
+    */
+   void SetActiveSubprocess(std::string const &subprocess);

 
    /** \brief Initialize an item.
     *
 
    /** \brief Initialize an item.
     *


@@ -301,11 +315,8 @@ class pkgAcquire::Item : public WeakPointable
     *  manually invoke QueueURI() to do so).
     *
     *  \param Owner The new owner of this item.
     *  manually invoke QueueURI() to do so).
     *
     *  \param Owner The new owner of this item.

-    *  \param ExpectedHashes of the file represented by this item

     */
     */

-   Item(pkgAcquire *Owner,
-        HashStringList const &ExpectedHashes=HashStringList(),
-        pkgAcqMetaBase *TransactionManager=NULL);
+   Item(pkgAcquire * const Owner);

 
    /** \brief Remove this item from its owner's queue by invoking
     *  pkgAcquire::Remove.
 
    /** \brief Remove this item from its owner's queue by invoking
     *  pkgAcquire::Remove.


@@ -313,6 +324,11 @@ class pkgAcquire::Item : public WeakPointable
    virtual ~Item();
 
    protected:
    virtual ~Item();
 
    protected:

+   /** \brief The acquire object with which this item is associated. */
+   pkgAcquire * const Owner;
+
+   /** \brief The item that is currently being downloaded. */
+   pkgAcquire::ItemDesc Desc;

 
    enum RenameOnErrorState {
       HashSumMismatch,
 
    enum RenameOnErrorState {
       HashSumMismatch,


@@ -320,6 +336,8 @@ class pkgAcquire::Item : public WeakPointable
       InvalidFormat,
       SignatureError,
       NotClearsigned,
       InvalidFormat,
       SignatureError,
       NotClearsigned,

+      MaximumSizeExceeded,
+      PDiffError,

    };
 
    /** \brief Rename failed file and set error
    };
 
    /** \brief Rename failed file and set error


@@ -328,159 +346,108 @@ class pkgAcquire::Item : public WeakPointable
     */
    bool RenameOnError(RenameOnErrorState const state);
 
     */
    bool RenameOnError(RenameOnErrorState const state);
 

-   /** \brief The HashSums of the item is supposed to have than done */
-   HashStringList ExpectedHashes;
+   /** \brief Insert this item into its owner's queue.
+    *
+    *  The method is designed to check if the request would end
+    *  in an IMSHit and if it determines that it would, it isn't
+    *  queueing the Item and instead sets it to completion instantly.
+    *
+    *  \param Item Metadata about this item (its URI and
+    *  description).
+    *  \return true if the item was inserted, false if IMSHit was detected
+    */
+   virtual bool QueueURI(ItemDesc &Item);

 
 

-   /** \brief The item that is currently being downloaded. */
-   pkgAcquire::ItemDesc Desc;
-};
-                                                                       /*}}}*/
-/** \brief Information about an index patch (aka diff). */             /*{{{*/
-struct DiffInfo {
-   /** The filename of the diff. */
-   std::string file;
+   /** \brief Remove this item from its owner's queue. */
+   void Dequeue();

 
 

-   /** The sha1 hash of the diff. */
-   std::string sha1;
+   /** \brief Rename a file without modifying its timestamp.
+    *
+    *  Many item methods call this as their final action.
+    *
+    *  \param From The file to be renamed.
+    *
+    *  \param To The new name of \a From.  If \a To exists it will be
+    *  overwritten. If \a From and \a To are equal nothing happens.
+    */
+   bool Rename(std::string const &From, std::string const &To);

 
 

-   /** The size of the diff. */
-   unsigned long size;
-};
-                                                                       /*}}}*/
-                                                                       /*}}}*/
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;

 
 

-class pkgAcqMetaBase  : public pkgAcquire::Item
-{
+   private:

    void *d;
 
    void *d;
 

- protected:
-   std::vector<Item*> Transaction;
-
- public:
-   // transaction code
-   void Add(Item *I);
-   void AbortTransaction();
-   bool TransactionHasError() APT_PURE;
-   void CommitTransaction();
-
-   // helper for the signature warning
-   bool GenerateAuthWarning(const std::string &RealURI,
-                            const std::string &Message);
-
-
-   pkgAcqMetaBase(pkgAcquire *Owner,
-                  HashStringList const &ExpectedHashes=HashStringList(),
-                  pkgAcqMetaBase *TransactionManager=NULL)
-      : Item(Owner, ExpectedHashes, TransactionManager) {};
+   friend class pkgAcqMetaBase;

 };
 };

-
-/** \brief An acquire item that downloads the detached signature       {{{
- *  of a meta-index (Release) file, then queues up the release
- *  file itself.
- *
- *  \todo Why protected members?
- *
- *  \sa pkgAcqMetaIndex
- */
-class pkgAcqMetaSig : public pkgAcqMetaBase
+                                                                       /*}}}*/
+class APT_HIDDEN pkgAcqTransactionItem: public pkgAcquire::Item                /*{{{*/
+/** \brief baseclass for the indexes files to manage them all together */

 {
 {

-   void *d;
-

    protected:
    protected:

+   IndexTarget const * const Target;
+   HashStringList GetExpectedHashesFor(std::string const MetaKey) const;

 
 

-   /** \brief The URI of the signature file.  Unlike Desc.URI, this is
-    *  never modified; it is used to determine the file that is being
-    *  downloaded.
-    */
-   std::string RealURI;
-
-   std::string URIDesc;
-   std::string ShortDesc;
+   bool QueueURI(pkgAcquire::ItemDesc &Item);

 
 

-   /** \brief A package-system-specific parser for the meta-index file. */
-   indexRecords* MetaIndexParser;
+   public:
+   /** \brief storge name until a transaction is finished */
+   std::string PartialFile;

 
 

-   /** \brief The file we need to verify */
-   std::string MetaIndexFile;
+   /** \brief TransactionManager */
+   pkgAcqMetaBase * const TransactionManager;

 
 

-   /** \brief The index files which should be looked up in the meta-index
-    *  and then downloaded.
-    *
-    *  \todo Why a list of pointers instead of a list of structs?
-    */
-   const std::vector<IndexTarget*>* IndexTargets;
+   enum TransactionStates {
+      TransactionCommit,
+      TransactionAbort,
+   };
+   virtual bool TransactionState(TransactionStates const state);

 
 

-   /** \brief If we are in fetching or download state */
-   bool AuthPass;
+   virtual std::string DescURI() const { return Target->URI; }
+   virtual HashStringList GetExpectedHashes() const;
+   virtual std::string GetMetaKey() const;
+   virtual bool HashesRequired() const;

 
 

-   /** \brief Was this file already on disk */
-   bool IMSHit;

 
 

-   public:
-   
-   // Specialized action members
-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string Custom600Headers() const;
-   virtual std::string DescURI() {return RealURI; };
+   pkgAcqTransactionItem(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager, IndexTarget const * const Target);
+   virtual ~pkgAcqTransactionItem();

 
 

-   /** \brief Create a new pkgAcqMetaSig. */
-   pkgAcqMetaSig(pkgAcquire *Owner,
-                 pkgAcqMetaBase *TransactionManager,
-                 std::string URI,std::string URIDesc, std::string ShortDesc,
-                 std::string MetaIndexFile,
-                const std::vector<IndexTarget*>* IndexTargets,
-                indexRecords* MetaIndexParser);
-   virtual ~pkgAcqMetaSig();
+   friend class pkgAcqMetaBase;

 };
                                                                        /*}}}*/
 };
                                                                        /*}}}*/

-
-/** \brief An item that is responsible for downloading the meta-index  {{{
- *  file (i.e., Release) itself and verifying its signature.
- *
- *  Once the download and verification are complete, the downloads of
- *  the individual index files are queued up using pkgAcqDiffIndex.
- *  If the meta-index file had a valid signature, the expected hashsums
- *  of the index files will be the md5sums listed in the meta-index;
- *  otherwise, the expected hashsums will be "" (causing the
- *  authentication of the index files to be bypassed).
- */
-class pkgAcqMetaIndex : public pkgAcqMetaBase
+class APT_HIDDEN pkgAcqMetaBase : public pkgAcqTransactionItem         /*{{{*/
+/** \brief the manager of a transaction */

 {
    void *d;
 
 {
    void *d;
 

-   protected:
-   /** \brief The URI that is actually being downloaded; never
-    *  modified by pkgAcqMetaIndex.
-    */
-   std::string RealURI;
-
-   /** \brief The file in which the signature for this index was stored.
-    *
-    *  If empty, the signature and the md5sums of the individual
-    *  indices will not be checked.
-    */
-   std::string SigFile;
+ protected:
+   std::vector<pkgAcqTransactionItem*> Transaction;

 
 

-   /** \brief The index files to download. */
-   const std::vector<IndexTarget*>* IndexTargets;
+   IndexTarget const DataTarget;
+ public:
+   /** \brief A package-system-specific parser for the meta-index file. */
+   indexRecords *MetaIndexParser;
+   indexRecords *LastMetaIndexParser;
+ protected:

 
 

-   /** \brief The parser for the meta-index file. */
-   indexRecords* MetaIndexParser;
+   /** \brief The index files which should be looked up in the meta-index
+    *  and then downloaded.
+    */
+   const std::vector<IndexTarget*>* const IndexTargets;

 
    /** \brief If \b true, the index's signature is currently being verified.
     */
    bool AuthPass;
 
    /** \brief If \b true, the index's signature is currently being verified.
     */
    bool AuthPass;

-   // required to deal gracefully with problems caused by incorrect ims hits
-   bool IMSHit; 

 
 

-   /** \brief Check that the release file is a release file for the
-    *  correct distribution.
+   /** \brief Starts downloading the individual index files.

     *
     *

-    *  \return \b true if no fatal errors were encountered.
+    *  \param verify If \b true, only indices whose expected hashsum
+    *  can be determined from the meta-index will be downloaded, and
+    *  the hashsums of indices will be checked (reporting
+    *  #StatAuthError if there is a mismatch).  If verify is \b false,
+    *  no hashsum checking will be performed.

     */
     */

-   bool VerifyVendor(std::string Message);
+   void QueueIndexes(bool const verify);

 
    /** \brief Called when a file is finished being retrieved.
     *
 
    /** \brief Called when a file is finished being retrieved.
     *


@@ -491,7 +458,12 @@ class pkgAcqMetaIndex : public pkgAcqMetaBase
     *  \param Message The message block received from the fetch
     *  subprocess.
     */
     *  \param Message The message block received from the fetch
     *  subprocess.
     */

-   void RetrievalDone(std::string Message);
+   bool CheckDownloadDone(pkgAcqTransactionItem * const I, const std::string &Message, HashStringList const &Hashes) const;
+
+   /** \brief Queue the downloaded Signature for verification */
+   void QueueForSignatureVerify(pkgAcqTransactionItem * const I, std::string const &File, std::string const &Signature);
+
+   virtual std::string Custom600Headers() const;

 
    /** \brief Called when authentication succeeded.
     *
 
    /** \brief Called when authentication succeeded.
     *


@@ -502,115 +474,161 @@ class pkgAcqMetaIndex : public pkgAcqMetaBase
     *  \param Message The message block received from the fetch
     *  subprocess.
     */
     *  \param Message The message block received from the fetch
     *  subprocess.
     */

-   void AuthDone(std::string Message);
+   bool CheckAuthDone(std::string const &Message);

 
 

-   std::string URIDesc;
-   std::string ShortDesc;
+   /** Check if the current item should fail at this point */
+   bool CheckStopAuthentication(pkgAcquire::Item * const I, const std::string &Message);

 
 

-   /** \brief The URI of the meta-index file for the detached signature */
-   std::string MetaIndexSigURI;
+   /** \brief Check that the release file is a release file for the
+    *  correct distribution.
+    *
+    *  \return \b true if no fatal errors were encountered.
+    */
+   bool VerifyVendor(std::string const &Message);

 
 

-   /** \brief A "URI-style" description of the meta-index file */
-   std::string MetaIndexSigURIDesc;
+   virtual bool TransactionState(TransactionStates const state);

 
 

-   /** \brief A brief description of the meta-index file */
-   std::string MetaIndexSigShortDesc;
+ public:
+   // This refers more to the Transaction-Manager than the actual file
+   bool IMSHit;

 
 

-   /** \brief delayed constructor */
-   void Init(std::string URIDesc, std::string ShortDesc);
-   
-   public:
+   virtual bool QueueURI(pkgAcquire::ItemDesc &Item);
+   virtual HashStringList GetExpectedHashes() const;
+   virtual bool HashesRequired() const;

 
 

-   /** \brief Starts downloading the individual index files.
-    *
-    *  \param verify If \b true, only indices whose expected hashsum
-    *  can be determined from the meta-index will be downloaded, and
-    *  the hashsums of indices will be checked (reporting
-    *  #StatAuthError if there is a mismatch).  If verify is \b false,
-    *  no hashsum checking will be performed.
+   // transaction code
+   void Add(pkgAcqTransactionItem * const I);
+   void AbortTransaction();
+   bool TransactionHasError() const;
+   void CommitTransaction();
+
+   /** \brief Stage (queue) a copy action when the transaction is committed
+    */
+   void TransactionStageCopy(pkgAcqTransactionItem * const I,
+                             const std::string &From,
+                             const std::string &To);
+   /** \brief Stage (queue) a removal action when the transaction is committed

     */
     */

-   void QueueIndexes(bool verify);
+   void TransactionStageRemoval(pkgAcqTransactionItem * const I, const std::string &FinalFile);
+
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+
+   pkgAcqMetaBase(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                 std::vector<IndexTarget*> const * const IndexTargets,
+                 IndexTarget const &DataTarget,
+                 indexRecords* const MetaIndexParser);
+};
+                                                                       /*}}}*/
+/** \brief An item that is responsible for downloading the meta-index  {{{
+ *  file (i.e., Release) itself and verifying its signature.
+ *
+ *  Once the download and verification are complete, the downloads of
+ *  the individual index files are queued up using pkgAcqDiffIndex.
+ *  If the meta-index file had a valid signature, the expected hashsums
+ *  of the index files will be the md5sums listed in the meta-index;
+ *  otherwise, the expected hashsums will be "" (causing the
+ *  authentication of the index files to be bypassed).
+ */
+class APT_HIDDEN pkgAcqMetaIndex : public pkgAcqMetaBase
+{
+   void *d;
+
+   protected:
+   IndexTarget const DetachedSigTarget;
+
+   /** \brief delayed constructor */
+   void Init(std::string const &URIDesc, std::string const &ShortDesc);
+
+   public:
+   virtual std::string DescURI() const;

 
    // Specialized action members
 
    // Specialized action members

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string Custom600Headers() const;
-   virtual std::string DescURI() {return RealURI; };
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);

    virtual void Finished();
 
    /** \brief Create a new pkgAcqMetaIndex. */
    virtual void Finished();
 
    /** \brief Create a new pkgAcqMetaIndex. */

-   pkgAcqMetaIndex(pkgAcquire *Owner,
-                   pkgAcqMetaBase *TransactionManager,
-                  std::string URI,std::string URIDesc, std::string ShortDesc,
-                   std::string MetaIndexSigURI, std::string MetaIndexSigURIDesc, std::string MetaIndexSigShortDesc,
-                  const std::vector<IndexTarget*>* IndexTargets,
-                  indexRecords* MetaIndexParser);
+   pkgAcqMetaIndex(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                  IndexTarget const &DataTarget, IndexTarget const &DetachedSigTarget,
+                  const std::vector<IndexTarget*>* const IndexTargets, indexRecords * const MetaIndexParser);
+
+   friend class pkgAcqMetaSig;

 };
                                                                        /*}}}*/
 };
                                                                        /*}}}*/

-/** \brief An item repsonsible for downloading clearsigned metaindexes {{{*/
-class pkgAcqMetaClearSig : public pkgAcqMetaIndex
+/** \brief An acquire item that downloads the detached signature       {{{
+ *  of a meta-index (Release) file, then queues up the release
+ *  file itself.
+ *
+ *  \todo Why protected members?
+ *
+ *  \sa pkgAcqMetaIndex
+ */
+class APT_HIDDEN pkgAcqMetaSig : public pkgAcqTransactionItem

 {
    void *d;
 
 {
    void *d;
 

-   /** \brief The URI of the meta-index file for the detached signature */
-   std::string MetaIndexURI;
+   pkgAcqMetaIndex * const MetaIndex;

 
 

-   /** \brief A "URI-style" description of the meta-index file */
-   std::string MetaIndexURIDesc;
+   /** \brief The file we use to verify the MetaIndexFile with (not always set!) */
+   std::string MetaIndexFileSignature;

 
 

-   /** \brief A brief description of the meta-index file */
-   std::string MetaIndexShortDesc;
+   protected:
+
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+
+   public:
+   virtual bool HashesRequired() const { return false; }

 
 

-   /** \brief The URI of the detached meta-signature file if the clearsigned one failed. */
-   std::string MetaSigURI;
+   // Specialized action members
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);

 
 

-   /** \brief A "URI-style" description of the meta-signature file */
-   std::string MetaSigURIDesc;
+   /** \brief Create a new pkgAcqMetaSig. */
+   pkgAcqMetaSig(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager, IndexTarget const * const Target,
+        pkgAcqMetaIndex * const MetaIndex);
+   virtual ~pkgAcqMetaSig();
+};
+                                                                       /*}}}*/
+/** \brief An item repsonsible for downloading clearsigned metaindexes {{{*/
+class APT_HIDDEN pkgAcqMetaClearSig : public pkgAcqMetaIndex
+{
+   void *d;

 
 

-   /** \brief A brief description of the meta-signature file */
-   std::string MetaSigShortDesc;
+   IndexTarget const ClearsignedTarget;
+   IndexTarget const DetachedDataTarget;
+   IndexTarget const DetachedSigTarget;

 
 public:
 
 public:

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);

    virtual std::string Custom600Headers() const;
    virtual std::string Custom600Headers() const;

-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);

 
    /** \brief Create a new pkgAcqMetaClearSig. */
 
    /** \brief Create a new pkgAcqMetaClearSig. */

-   pkgAcqMetaClearSig(pkgAcquire *Owner,
-               std::string const &URI, std::string const &URIDesc, std::string const &ShortDesc,
-               std::string const &MetaIndexURI, std::string const &MetaIndexURIDesc, std::string const &MetaIndexShortDesc,
-               std::string const &MetaSigURI, std::string const &MetaSigURIDesc, std::string const &MetaSigShortDesc,
-               const std::vector<IndexTarget*>* IndexTargets,
-               indexRecords* MetaIndexParser);
+   pkgAcqMetaClearSig(pkgAcquire * const Owner,
+               IndexTarget const &ClearsignedTarget,
+               IndexTarget const &DetachedDataTarget,
+               IndexTarget const &DetachedSigTarget,
+               std::vector<IndexTarget*> const * const IndexTargets,
+               indexRecords * const MetaIndexParser);

    virtual ~pkgAcqMetaClearSig();
 };
                                                                        /*}}}*/
    virtual ~pkgAcqMetaClearSig();
 };
                                                                        /*}}}*/

-
-
-/** \brief Common base class for all classes that deal with fetching   {{{
-           indexes
- */
-class pkgAcqBaseIndex : public pkgAcquire::Item
+/** \brief Common base class for all classes that deal with fetching indexes   {{{*/
+class APT_HIDDEN pkgAcqBaseIndex : public pkgAcqTransactionItem

 {
    void *d;
 
 {
    void *d;
 

- protected:
-   /** \brief Pointer to the IndexTarget data
-    */
-   const struct IndexTarget * Target;
-   indexRecords *MetaIndexParser;
-   /** \brief The MetaIndex Key */
-   std::string MetaKey;
-
-   pkgAcqBaseIndex(pkgAcquire *Owner,
-                   pkgAcqMetaBase *TransactionManager,
-                   struct IndexTarget const * const Target,
-                   HashStringList const &ExpectedHashes,
-                   indexRecords *MetaIndexParser)
-      : Item(Owner, ExpectedHashes, TransactionManager), Target(Target), 
-        MetaIndexParser(MetaIndexParser) {};
+ public:
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+
+   pkgAcqBaseIndex(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                   IndexTarget const * const Target);

 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching an index file of   {{{
 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching an index file of   {{{


@@ -622,7 +640,7 @@ class pkgAcqBaseIndex : public pkgAcquire::Item
  *
  *  \sa pkgAcqIndexDiffs, pkgAcqIndex
  */
  *
  *  \sa pkgAcqIndexDiffs, pkgAcqIndex
  */

-class pkgAcqDiffIndex : public pkgAcqBaseIndex
+class APT_HIDDEN pkgAcqDiffIndex : public pkgAcqBaseIndex

 {
    void *d;
 
 {
    void *d;
 


@@ -630,11 +648,6 @@ class pkgAcqDiffIndex : public pkgAcqBaseIndex
    /** \brief If \b true, debugging information will be written to std::clog. */
    bool Debug;
 
    /** \brief If \b true, debugging information will be written to std::clog. */
    bool Debug;
 

-   /** \brief The URI of the index file to recreate at our end (either
-    *  by downloading it or by applying partial patches).
-    */
-   std::string RealURI;
-

    /** \brief The index file which will be patched to generate the new
     *  file.
     */
    /** \brief The index file which will be patched to generate the new
     *  file.
     */


@@ -645,17 +658,20 @@ class pkgAcqDiffIndex : public pkgAcqBaseIndex
     */
    std::string Description;
 
     */
    std::string Description;
 

-   /** \brief If the copy step of the packages file is done
-    */
-   bool PackagesFileReadyInPartial;
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+
+   virtual bool QueueURI(pkgAcquire::ItemDesc &Item);

 
 

+   virtual bool TransactionState(TransactionStates const state);

  public:
    // Specialized action members
  public:
    // Specialized action members

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string DescURI() {return RealURI + "Index";};
+   virtual void Failed(std::string const &Message, pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);
+   virtual std::string DescURI() const {return Target->URI + "Index";};

    virtual std::string Custom600Headers() const;
    virtual std::string Custom600Headers() const;

+   virtual std::string GetMetaKey() const;

 
    /** \brief Parse the Index file for a set of Packages diffs.
     *
 
    /** \brief Parse the Index file for a set of Packages diffs.
     *


@@ -667,8 +683,7 @@ class pkgAcqDiffIndex : public pkgAcqBaseIndex
     *  \return \b true if the Index file was successfully parsed, \b
     *  false otherwise.
     */
     *  \return \b true if the Index file was successfully parsed, \b
     *  false otherwise.
     */

-   bool ParseDiffIndex(std::string IndexDiffFile);
-   
+   bool ParseDiffIndex(std::string const &IndexDiffFile);

 
    /** \brief Create a new pkgAcqDiffIndex.
     *
 
    /** \brief Create a new pkgAcqDiffIndex.
     *


@@ -679,14 +694,25 @@ class pkgAcqDiffIndex : public pkgAcqBaseIndex
     *  \param URIDesc A long description of the list file to download.
     *
     *  \param ShortDesc A short description of the list file to download.
     *  \param URIDesc A long description of the list file to download.
     *
     *  \param ShortDesc A short description of the list file to download.

-    *
-    *  \param ExpectedHashes The list file's hashsums which are expected.

     */
     */

-   pkgAcqDiffIndex(pkgAcquire *Owner,
-                   pkgAcqMetaBase *TransactionManager,
-                   struct IndexTarget const * const Target,
-                   HashStringList const &ExpectedHashes,
-                   indexRecords *MetaIndexParser);
+   pkgAcqDiffIndex(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                   IndexTarget const * const Target);
+ private:
+   APT_HIDDEN void QueueOnIMSHit() const;
+};
+                                                                       /*}}}*/
+struct APT_HIDDEN DiffInfo {                                           /*{{{*/
+   /** The filename of the diff. */
+   std::string file;
+
+   /** The hashes of the file after the diff is applied */
+   HashStringList result_hashes;
+
+   /** The hashes of the diff */
+   HashStringList patch_hashes;
+
+   /** The hashes of the compressed diff */
+   HashStringList download_hashes;

 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching client-merge patches {{{
 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching client-merge patches {{{


@@ -700,7 +726,7 @@ class pkgAcqDiffIndex : public pkgAcqBaseIndex
  *
  *  \sa pkgAcqDiffIndex, pkgAcqIndex
  */
  *
  *  \sa pkgAcqDiffIndex, pkgAcqIndex
  */

-class pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex
+class APT_HIDDEN pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex

 {
    void *d;
 
 {
    void *d;
 


@@ -711,11 +737,6 @@ class pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex
     */
    bool Debug;
 
     */
    bool Debug;
 

-   /** \brief URI of the package index file that is being
-    *  reconstructed.
-    */
-   std::string RealURI;
-

    /** \brief description of the file being downloaded. */
    std::string Description;
 
    /** \brief description of the file being downloaded. */
    std::string Description;
 


@@ -747,10 +768,13 @@ class pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex
     *  This method will fall back to downloading the whole index file
     *  outright; its arguments are ignored.
     */
     *  This method will fall back to downloading the whole index file
     *  outright; its arguments are ignored.
     */

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-        pkgAcquire::MethodConfig *Cnf);
-   virtual std::string DescURI() {return RealURI + "Index";};
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+        pkgAcquire::MethodConfig const * const Cnf);
+   virtual std::string Custom600Headers() const;
+   virtual std::string DescURI() const {return Target->URI + "Index";};
+   virtual HashStringList GetExpectedHashes() const;
+   virtual bool HashesRequired() const;

 
    /** \brief Create an index merge-diff item.
     *
 
    /** \brief Create an index merge-diff item.
     *


@@ -763,22 +787,15 @@ class pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex
     *
     *  \param ShortDesc A brief description of this item.
     *
     *
     *  \param ShortDesc A brief description of this item.
     *

-    *  \param ExpectedHashes The expected md5sum of the completely
-    *  reconstructed package index file; the index file will be tested
-    *  against this value when it is entirely reconstructed.
-    *

     *  \param patch contains infos about the patch this item is supposed
     *  to download which were read from the index
     *
     *  \param allPatches contains all related items so that each item can
     *  check if it was the last one to complete the download step
     */
     *  \param patch contains infos about the patch this item is supposed
     *  to download which were read from the index
     *
     *  \param allPatches contains all related items so that each item can
     *  check if it was the last one to complete the download step
     */

-   pkgAcqIndexMergeDiffs(pkgAcquire *Owner,
-                         pkgAcqMetaBase *TransactionManager,
-                         struct IndexTarget const * const Target,
-                         HashStringList const &ExpectedHash,
-                         indexRecords *MetaIndexParser,
-                         DiffInfo const &patch, 
+   pkgAcqIndexMergeDiffs(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                         IndexTarget const * const Target,
+                         DiffInfo const &patch,

                          std::vector<pkgAcqIndexMergeDiffs*> const * const allPatches);
 };
                                                                        /*}}}*/
                          std::vector<pkgAcqIndexMergeDiffs*> const * const allPatches);
 };
                                                                        /*}}}*/


@@ -793,7 +810,7 @@ class pkgAcqIndexMergeDiffs : public pkgAcqBaseIndex
  *
  *  \sa pkgAcqDiffIndex, pkgAcqIndex
  */
  *
  *  \sa pkgAcqDiffIndex, pkgAcqIndex
  */

-class pkgAcqIndexDiffs : public pkgAcqBaseIndex
+class APT_HIDDEN pkgAcqIndexDiffs : public pkgAcqBaseIndex

 {
    void *d;
 
 {
    void *d;
 


@@ -808,7 +825,7 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
     *  \return \b true if an applicable diff was found, \b false
     *  otherwise.
     */
     *  \return \b true if an applicable diff was found, \b false
     *  otherwise.
     */

-   bool QueueNextDiff();
+   APT_HIDDEN bool QueueNextDiff();

 
    /** \brief Handle tasks that must be performed after the item
     *  finishes downloading.
 
    /** \brief Handle tasks that must be performed after the item
     *  finishes downloading.


@@ -821,7 +838,7 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
     *  \param allDone If \b true, the file was entirely reconstructed,
     *  and its md5sum is verified. 
     */
     *  \param allDone If \b true, the file was entirely reconstructed,
     *  and its md5sum is verified. 
     */

-   void Finish(bool allDone=false);
+   APT_HIDDEN void Finish(bool const allDone=false);

 
    protected:
 
 
    protected:
 


@@ -830,11 +847,6 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
     */
    bool Debug;
 
     */
    bool Debug;
 

-   /** \brief The URI of the package index file that is being
-    *  reconstructed.
-    */
-   std::string RealURI;
-

    /** A description of the file being downloaded. */
    std::string Description;
 
    /** A description of the file being downloaded. */
    std::string Description;
 


@@ -848,9 +860,6 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
     */
    std::vector<DiffInfo> available_patches;
 
     */
    std::vector<DiffInfo> available_patches;
 

-   /** Stop applying patches when reaching that sha1 */
-   std::string ServerSha1;
-

    /** The current status of this patch. */
    enum DiffState
      {
    /** The current status of this patch. */
    enum DiffState
      {


@@ -859,26 +868,26 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
 
         /** \brief The diff is currently being fetched. */
         StateFetchDiff,
 
         /** \brief The diff is currently being fetched. */
         StateFetchDiff,

-        
-        /** \brief The diff is currently being uncompressed. */
-        StateUnzipDiff, // FIXME: No longer used

 
         /** \brief The diff is currently being applied. */
         StateApplyDiff
    } State;
 
    public:
 
         /** \brief The diff is currently being applied. */
         StateApplyDiff
    } State;
 
    public:

-   
+

    /** \brief Called when the patch file failed to be downloaded.
     *
     *  This method will fall back to downloading the whole index file
     *  outright; its arguments are ignored.
     */
    /** \brief Called when the patch file failed to be downloaded.
     *
     *  This method will fall back to downloading the whole index file
     *  outright; its arguments are ignored.
     */

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);

 
 

-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string DescURI() {return RealURI + "IndexDiffs";};
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);
+   virtual std::string Custom600Headers() const;
+   virtual std::string DescURI() const {return Target->URI + "IndexDiffs";};
+   virtual HashStringList GetExpectedHashes() const;
+   virtual bool HashesRequired() const;

 
    /** \brief Create an index diff item.
     *
 
    /** \brief Create an index diff item.
     *


@@ -894,23 +903,13 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
     *
     *  \param ShortDesc A brief description of this item.
     *
     *
     *  \param ShortDesc A brief description of this item.
     *

-    *  \param ExpectedHashes The expected md5sum of the completely
-    *  reconstructed package index file; the index file will be tested
-    *  against this value when it is entirely reconstructed.
-    *
-    *  \param ServerSha1 is the sha1sum of the current file on the server
-    *

     *  \param diffs The remaining diffs from the index of diffs.  They
     *  should be ordered so that each diff appears before any diff
     *  that depends on it.
     */
     *  \param diffs The remaining diffs from the index of diffs.  They
     *  should be ordered so that each diff appears before any diff
     *  that depends on it.
     */

-   pkgAcqIndexDiffs(pkgAcquire *Owner,
-                    pkgAcqMetaBase *TransactionManager,
-                    struct IndexTarget const * const Target,
-                    HashStringList const &ExpectedHash,
-                    indexRecords *MetaIndexParser,
-                   std::string ServerSha1,
-                   std::vector<DiffInfo> diffs=std::vector<DiffInfo>());
+   pkgAcqIndexDiffs(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+                    IndexTarget const * const Target,
+                   std::vector<DiffInfo> const &diffs=std::vector<DiffInfo>());

 };
                                                                        /*}}}*/
 /** \brief An acquire item that is responsible for fetching an index   {{{
 };
                                                                        /*}}}*/
 /** \brief An acquire item that is responsible for fetching an index   {{{


@@ -920,153 +919,79 @@ class pkgAcqIndexDiffs : public pkgAcqBaseIndex
  *
  *  \todo Why does pkgAcqIndex have protected members?
  */
  *
  *  \todo Why does pkgAcqIndex have protected members?
  */

-class pkgAcqIndex : public pkgAcqBaseIndex
+class APT_HIDDEN pkgAcqIndex : public pkgAcqBaseIndex

 {
    void *d;
 
    protected:
 
 {
    void *d;
 
    protected:
 

-   /** \brief If \b true, the index file has been decompressed. */
-   bool Decompression;
+   /** \brief The stages the method goes through
+    *
+    *  The method first downloads the indexfile, then its decompressed (or
+    *  copied) and verified
+    */
+   enum AllStages {
+      STAGE_DOWNLOAD,
+      STAGE_DECOMPRESS_AND_VERIFY,
+   };
+   AllStages Stage;

 
 

-   /** \brief If \b true, the partially downloaded file will be
-    *  removed when the download completes.
+   /** \brief Handle what needs to be done when the download is done */
+   void StageDownloadDone(std::string const &Message,
+                          HashStringList const &Hashes,
+                          pkgAcquire::MethodConfig const * const Cfg);
+
+   /** \brief Handle what needs to be done when the decompression/copy is
+    *         done 

     */
     */

-   bool Erase;
+   void StageDecompressDone(std::string const &Message,
+                            HashStringList const &Hashes,
+                            pkgAcquire::MethodConfig const * const Cfg);

 
 

-   /** \brief The object that is actually being fetched (minus any
-    *  compression-related extensions).
+   /** \brief If \b set, this partially downloaded file will be
+    *  removed when the download completes.

     */
     */

-   std::string RealURI;
+   std::string EraseFileName;

 
    /** \brief The compression-related file extensions that are being
     *  added to the downloaded file one by one if first fails (e.g., "gz bz2").
     */
 
    /** \brief The compression-related file extensions that are being
     *  added to the downloaded file one by one if first fails (e.g., "gz bz2").
     */

-   std::string CompressionExtension;
+   std::string CompressionExtensions;

 
 

+   /** \brief The actual compression extension currently used */
+   std::string CurrentCompressionExtension;

 
    /** \brief Do the changes needed to fetch via AptByHash (if needed) */
 
    /** \brief Do the changes needed to fetch via AptByHash (if needed) */

-   void InitByHashIfNeeded(const std::string MetaKey);
+   void InitByHashIfNeeded();

 
    /** \brief Auto select the right compression to use */
    void AutoSelectCompression();
 
 
    /** \brief Auto select the right compression to use */
    void AutoSelectCompression();
 

-   /** \brief Get the full pathname of the final file for the current URI
-    */
-   std::string GetFinalFilename() const;
-

    /** \brief Schedule file for verification after a IMS hit */
    void ReverifyAfterIMS();
 
    /** \brief Schedule file for verification after a IMS hit */
    void ReverifyAfterIMS();
 

-   public:
-   
-   // Specialized action members
-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string Custom600Headers() const;
-   virtual std::string DescURI() {return Desc.URI;};
+   /** \brief Validate the downloaded index file */
+   bool ValidateFile(std::string const &FileName);

 
 

-   /** \brief Create a pkgAcqIndex.
-    *
-    *  \param Owner The pkgAcquire object with which this item is
-    *  associated.
-    *
-    *  \param URI The URI of the index file that is to be downloaded.
-    *
-    *  \param URIDesc A "URI-style" description of this index file.
-    *
-    *  \param ShortDesc A brief description of this index file.
-    *
-    *  \param ExpectedHashes The expected hashsum of this index file.
-    *
-    *  \param compressExt The compression-related extension with which
-    *  this index file should be downloaded, or "" to autodetect
-    *  Compression types can be set with config Acquire::CompressionTypes,
-    *  default is ".lzma" or ".bz2" (if the needed binaries are present)
-    *  fallback is ".gz" or none.
-    */
-   pkgAcqIndex(pkgAcquire *Owner,std::string URI,std::string URIDesc,
-              std::string ShortDesc, HashStringList const &ExpectedHashes);
-   pkgAcqIndex(pkgAcquire *Owner, pkgAcqMetaBase *TransactionManager,
-               IndexTarget const * const Target,
-               HashStringList const &ExpectedHash,
-               indexRecords *MetaIndexParser);
-               
-   void Init(std::string const &URI, std::string const &URIDesc,
-             std::string const &ShortDesc);
-};
-                                                                       /*}}}*/
-/** \brief An acquire item that is responsible for fetching a          {{{
- *  translated index file.
- *
- *  The only difference from pkgAcqIndex is that transient failures
- *  are suppressed: no error occurs if the translated index file is
- *  missing.
- */
-class pkgAcqIndexTrans : public pkgAcqIndex
-{
-   void *d;
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+
+   virtual bool TransactionState(TransactionStates const state);

 
    public:
 
    public:

-  
-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
+   // Specialized action members
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);

    virtual std::string Custom600Headers() const;
    virtual std::string Custom600Headers() const;

+   virtual std::string DescURI() const {return Desc.URI;};
+   virtual std::string GetMetaKey() const;

 
 

-   /** \brief Create a pkgAcqIndexTrans.
-    *
-    *  \param Owner The pkgAcquire object with which this item is
-    *  associated.
-    *
-    *  \param URI The URI of the index file that is to be downloaded.
-    *
-    *  \param URIDesc A "URI-style" description of this index file.
-    *
-    *  \param ShortDesc A brief description of this index file.
-    */
-   pkgAcqIndexTrans(pkgAcquire *Owner,
-                    std::string URI,std::string URIDesc,
-                   std::string ShortDesc);
-   pkgAcqIndexTrans(pkgAcquire *Owner,
-                    pkgAcqMetaBase *TransactionManager,
-                    IndexTarget const * const Target,
-                    HashStringList const &ExpectedHashes,
-                    indexRecords *MetaIndexParser);
-};
-                                                                       /*}}}*/
-/** \brief Information about an index file. */                         /*{{{*/
-class IndexTarget
-{
-   void *d;
-
- public:
-   /** \brief A URI from which the index file can be downloaded. */
-   std::string URI;
-
-   /** \brief A description of the index file. */
-   std::string Description;
-
-   /** \brief A shorter description of the index file. */
-   std::string ShortDesc;
-
-   /** \brief The key by which this index file should be
-    *  looked up within the meta signature file.
-    */
-   std::string MetaKey;
-
-   virtual bool IsOptional() const {
-      return false;
-   }
-};
-                                                                       /*}}}*/
-/** \brief Information about an optional index file. */                        /*{{{*/
-class OptionalIndexTarget : public IndexTarget
-{
-   void *d;
+   pkgAcqIndex(pkgAcquire * const Owner, pkgAcqMetaBase * const TransactionManager,
+               IndexTarget const * const Target);

 
 

-   virtual bool IsOptional() const {
-      return true;
-   }
+   void Init(std::string const &URI, std::string const &URIDesc,
+             std::string const &ShortDesc);

 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching a package file.    {{{
 };
                                                                        /*}}}*/
 /** \brief An item that is responsible for fetching a package file.    {{{


@@ -1078,6 +1003,9 @@ class pkgAcqArchive : public pkgAcquire::Item
 {
    void *d;
 
 {
    void *d;
 

+   bool LocalSource;
+   HashStringList ExpectedHashes;
+

    protected:
    /** \brief The package version being fetched. */
    pkgCache::VerIterator Version;
    protected:
    /** \brief The package version being fetched. */
    pkgCache::VerIterator Version;


@@ -1110,21 +1038,26 @@ class pkgAcqArchive : public pkgAcquire::Item
    /** \brief \b true if this version file is being downloaded from a
     *  trusted source.
     */
    /** \brief \b true if this version file is being downloaded from a
     *  trusted source.
     */

-   bool Trusted; 
+   bool Trusted;

 
    /** \brief Queue up the next available file for this version. */
    bool QueueNext();
 
    /** \brief Queue up the next available file for this version. */
    bool QueueNext();

-   
+
+   /** \brief Get the full pathname of the final file for the current URI */
+   virtual std::string GetFinalFilename() const;
+

    public:
    public:

-   
-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &Hashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string DescURI() {return Desc.URI;};
-   virtual std::string ShortDesc() {return Desc.ShortDesc;};
+
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &Hashes,
+                    pkgAcquire::MethodConfig const * const Cnf);
+   virtual std::string DescURI() const;
+   virtual std::string ShortDesc() const;

    virtual void Finished();
    virtual bool IsTrusted() const;
    virtual void Finished();
    virtual bool IsTrusted() const;

-   
+   virtual HashStringList GetExpectedHashes() const;
+   virtual bool HashesRequired() const;
+

    /** \brief Create a new pkgAcqArchive.
     *
     *  \param Owner The pkgAcquire object with which this item is
    /** \brief Create a new pkgAcqArchive.
     *
     *  \param Owner The pkgAcquire object with which this item is


@@ -1143,8 +1076,8 @@ class pkgAcqArchive : public pkgAcquire::Item
     *  basename in the constructor, and filled in with a fully
     *  qualified filename once the download finishes.
     */
     *  basename in the constructor, and filled in with a fully
     *  qualified filename once the download finishes.
     */

-   pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
-                pkgRecords *Recs,pkgCache::VerIterator const &Version,
+   pkgAcqArchive(pkgAcquire * const Owner,pkgSourceList * const Sources,
+                pkgRecords * const Recs,pkgCache::VerIterator const &Version,

                 std::string &StoreFilename);
 };
                                                                        /*}}}*/
                 std::string &StoreFilename);
 };
                                                                        /*}}}*/


@@ -1162,17 +1095,20 @@ class pkgAcqFile : public pkgAcquire::Item
     *  Acquire::Retries.
     */
    unsigned int Retries;
     *  Acquire::Retries.
     */
    unsigned int Retries;

-   
+

    /** \brief Should this file be considered a index file */
    bool IsIndexFile;
 
    /** \brief Should this file be considered a index file */
    bool IsIndexFile;
 

+   HashStringList const ExpectedHashes;

    public:
    public:

-   
+   virtual HashStringList GetExpectedHashes() const;
+   virtual bool HashesRequired() const;
+

    // Specialized action members
    // Specialized action members

-   virtual void Failed(std::string Message,pkgAcquire::MethodConfig *Cnf);
-   virtual void Done(std::string Message,unsigned long long Size, HashStringList const &CalcHashes,
-                    pkgAcquire::MethodConfig *Cnf);
-   virtual std::string DescURI() {return Desc.URI;};
+   virtual void Failed(std::string const &Message,pkgAcquire::MethodConfig const * const Cnf);
+   virtual void Done(std::string const &Message, HashStringList const &CalcHashes,
+                    pkgAcquire::MethodConfig const * const Cnf);
+   virtual std::string DescURI() const {return Desc.URI;};

    virtual std::string Custom600Headers() const;
 
    /** \brief Create a new pkgAcqFile object.
    virtual std::string Custom600Headers() const;
 
    /** \brief Create a new pkgAcqFile object.


@@ -1206,10 +1142,10 @@ class pkgAcqFile : public pkgAcquire::Item
     * is the absolute name to which the file should be downloaded.
     */
 
     * is the absolute name to which the file should be downloaded.
     */
 

-   pkgAcqFile(pkgAcquire *Owner, std::string URI, HashStringList const &Hashes, unsigned long long Size,
-             std::string Desc, std::string ShortDesc,
-             const std::string &DestDir="", const std::string &DestFilename="",
-             bool IsIndexFile=false);
+   pkgAcqFile(pkgAcquire * const Owner, std::string const &URI, HashStringList const &Hashes, unsigned long long const Size,
+             std::string const &Desc, std::string const &ShortDesc,
+             std::string const &DestDir="", std::string const &DestFilename="",
+             bool const IsIndexFile=false);

 };
                                                                        /*}}}*/
 /** @} */
 };
                                                                        /*}}}*/
 /** @} */