1 files changed, 222 insertions, 0 deletions
diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
new file mode 100644
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+++ b/apt-pkg/contrib/hashes.h
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+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Hashes - Simple wrapper around the hash functions
+   
+   This is just used to make building the methods simpler, this is the
+   only interface required..
+   
+   ##################################################################### */
+									/*}}}*/
+#ifndef APTPKG_HASHES_H
+#define APTPKG_HASHES_H
+
+#include <apt-pkg/macros.h>
+
+#ifdef APT_COMPILING_APT
+#include <apt-pkg/string_view.h>
+#include <apt-pkg/tagfile-keys.h>
+#endif
+
+#include <cstring>
+#include <string>
+#include <vector>
+
+
+
+class FileFd;
+
+// helper class that contains hash function name
+// and hash
+class APT_PUBLIC HashString
+{
+ protected:
+   std::string Type;
+   std::string Hash;
+   static const char * _SupportedHashes[10];
+
+   // internal helper
+   std::string GetHashForFile(std::string filename) const;
+
+ public:
+   HashString(std::string Type, std::string Hash);
+   explicit HashString(std::string StringedHashString);  // init from str as "type:hash"
+   HashString();
+
+   // get hash type used
+   std::string HashType() const { return Type; };
+   std::string HashValue() const { return Hash; };
+
+   // verify the given filename against the currently loaded hash
+   bool VerifyFile(std::string filename) const;
+
+   // generate a hash string from the given filename
+   bool FromFile(std::string filename);
+
+
+   // helper
+   std::string toStr() const;                    // convert to str as "type:hash"
+   bool empty() const;
+   bool usable() const;
+   bool operator==(HashString const &other) const;
+   bool operator!=(HashString const &other) const;
+
+   // return the list of hashes we support
+   static APT_PURE const char** SupportedHashes();
+#ifdef APT_COMPILING_APT
+   struct APT_HIDDEN HashSupportInfo {
+      APT::StringView name;
+      pkgTagSection::Key namekey;
+      APT::StringView chksumsname;
+      pkgTagSection::Key chksumskey;
+   };
+   APT_HIDDEN static std::vector<HashSupportInfo> SupportedHashesInfo();
+#endif
+};
+
+class APT_PUBLIC HashStringList
+{
+   public:
+   /** find best hash if no specific one is requested
+    *
+    * @param type of the checksum to return, can be \b NULL
+    * @return If type is \b NULL (or the empty string) it will
+    *  return the 'best' hash; otherwise the hash which was
+    *  specifically requested. If no hash is found \b NULL will be returned.
+    */
+   HashString const * find(char const * const type) const;
+   HashString const * find(std::string const &type) const { return find(type.c_str()); }
+
+   /** finds the filesize hash and returns it as number
+    *
+    * @return beware: if the size isn't known we return \b 0 here,
+    * just like we would do for an empty file. If that is a problem
+    * for you have to get the size manually out of the list.
+    */
+   unsigned long long FileSize() const;
+
+   /** sets the filesize hash
+    *
+    * @param Size of the file
+    * @return @see #push_back
+    */
+   bool FileSize(unsigned long long const Size);
+
+   /** check if the given hash type is supported
+    *
+    * @param type to check
+    * @return true if supported, otherwise false
+    */
+   static APT_PURE bool supported(char const * const type);
+   /** add the given #HashString to the list
+    *
+    * @param hashString to add
+    * @return true if the hash is added because it is supported and
+    *  not already a different hash of the same type included, otherwise false
+    */
+   bool push_back(const HashString &hashString);
+   /** @return size of the list of HashStrings */
+   size_t size() const { return list.size(); }
+
+   /** verify file against all hashes in the list
+    *
+    * @param filename to verify
+    * @return true if the file matches the hashsum, otherwise false
+    */
+   bool VerifyFile(std::string filename) const;
+
+   /** is the list empty ?
+    *
+    * @return \b true if the list is empty, otherwise \b false
+    */
+   bool empty() const { return list.empty(); }
+
+   /** has the list at least one good entry
+    *
+    * similar to #empty, but handles forced hashes.
+    *
+    * @return if no hash is forced, same result as #empty,
+    * if one is forced \b true if this has is available, \b false otherwise
+    */
+   bool usable() const;
+
+   typedef std::vector<HashString>::const_iterator const_iterator;
+
+   /** iterator to the first element */
+   const_iterator begin() const { return list.begin(); }
+
+   /** iterator to the end element */
+   const_iterator end() const { return list.end(); }
+
+   /** start fresh with a clear list */
+   void clear() { list.clear(); }
+
+   /** compare two HashStringList for similarity.
+    *
+    * Two lists are similar if at least one hashtype is in both lists
+    * and the hashsum matches. All hashes are checked by default,
+    * if one doesn't match false is returned regardless of how many
+    * matched before. If a hash is forced, only this hash is compared,
+    * all others are ignored.
+    */
+   bool operator==(HashStringList const &other) const;
+   bool operator!=(HashStringList const &other) const;
+
+   HashStringList() {}
+
+   // simplifying API-compatibility constructors
+   explicit HashStringList(std::string const &hash) {
+      if (hash.empty() == false)
+	 list.push_back(HashString(hash));
+   }
+   explicit HashStringList(char const * const hash) {
+      if (hash != NULL && hash[0] != '\0')
+	 list.push_back(HashString(hash));
+   }
+
+   private:
+   std::vector<HashString> list;
+};
+
+class PrivateHashes;
+class APT_PUBLIC Hashes
+{
+   PrivateHashes * const d;
+   public:
+   static const int UntilEOF = 0;
+
+   bool Add(const unsigned char * const Data, unsigned long long const Size) APT_NONNULL(2);
+   inline bool Add(const char * const Data) APT_NONNULL(2)
+   {return Add(reinterpret_cast<unsigned char const *>(Data),strlen(Data));};
+   inline bool Add(const char *const Data, unsigned long long const Size) APT_NONNULL(2)
+   {
+      return Add(reinterpret_cast<unsigned char const *>(Data), Size);
+   };
+   inline bool Add(const unsigned char * const Beg,const unsigned char * const End) APT_NONNULL(2,3)
+   {return Add(Beg,End-Beg);};
+
+   enum SupportedHashes { MD5SUM = (1 << 0), SHA1SUM = (1 << 1), SHA256SUM = (1 << 2),
+      SHA512SUM = (1 << 3) };
+   bool AddFD(int const Fd,unsigned long long Size = 0);
+   bool AddFD(FileFd &Fd,unsigned long long Size = 0);
+
+   HashStringList GetHashStringList();
+
+   /** Get a specific hash. It is an error to use a hash that was not hashes */
+   HashString GetHashString(SupportedHashes hash);
+
+   /** create a Hashes object to calculate all supported hashes
+    *
+    * If ALL is too much, you can limit which Hashes are calculated
+    * with the following other constructors which mention explicitly
+    * which hashes to generate. */
+   Hashes();
+   /** @param Hashes bitflag composed of #SupportedHashes */
+   explicit Hashes(unsigned int const Hashes);
+   /** @param Hashes is a list of hashes */
+   explicit Hashes(HashStringList const &Hashes);
+   virtual ~Hashes();
+};
+
+#endif