X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/245dde96193702f7f51389d3583dee547f8ba366..34b491e735ad47c4805e63f3b83a659b8d10262b:/apt-pkg/contrib/hashes.cc

diff --git a/apt-pkg/contrib/hashes.cc b/apt-pkg/contrib/hashes.cc
index 46cf0ba08..662c2bf8b 100644
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -129,6 +129,24 @@ APT_PURE bool HashString::empty() const					/*{{{*/
    return (Type.empty() || Hash.empty());
 }
 									/*}}}*/
+
+APT_PURE static bool IsConfigured(const char *name, const char *what)
+{
+   std::string option;
+   strprintf(option, "APT::Hashes::%s::%s", name, what);
+   return _config->FindB(option, false);
+}
+
+APT_PURE bool HashString::usable() const				/*{{{*/
+{
+   return (
+      (Type != "Checksum-FileSize") &&
+      (Type != "MD5Sum") &&
+      (Type != "SHA1") &&
+      !IsConfigured(Type.c_str(), "Untrusted")
+   );
+}
+									/*}}}*/
 std::string HashString::toStr() const					/*{{{*/
 {
    return Type + ":" + Hash;
@@ -151,10 +169,10 @@ bool HashStringList::usable() const					/*{{{*/
    std::string const forcedType = _config->Find("Acquire::ForceHash", "");
    if (forcedType.empty() == true)
    {
-      // FileSize alone isn't usable
-      for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
-	 if (hs->HashType() != "Checksum-FileSize")
-	    return true;
+      // See if there is at least one usable hash
+      for (auto const &hs: list)
+         if (hs.usable())
+            return true;
       return false;
    }
    return find(forcedType) != NULL;
@@ -276,12 +294,26 @@ public:
    unsigned long long FileSize;
    unsigned int CalcHashes;
 
-   PrivateHashes(unsigned int const CalcHashes) : FileSize(0), CalcHashes(CalcHashes) {}
+   explicit PrivateHashes(unsigned int const CalcHashes) : FileSize(0), CalcHashes(CalcHashes) {}
+   explicit PrivateHashes(HashStringList const &Hashes) : FileSize(0) {
+      unsigned int calcHashes = Hashes.usable() ? 0 : ~0;
+      if (Hashes.find("MD5Sum") != NULL)
+	 calcHashes |= Hashes::MD5SUM;
+      if (Hashes.find("SHA1") != NULL)
+	 calcHashes |= Hashes::SHA1SUM;
+      if (Hashes.find("SHA256") != NULL)
+	 calcHashes |= Hashes::SHA256SUM;
+      if (Hashes.find("SHA512") != NULL)
+	 calcHashes |= Hashes::SHA512SUM;
+      CalcHashes = calcHashes;
+   }
 };
 									/*}}}*/
 // Hashes::Add* - Add the contents of data or FD			/*{{{*/
 bool Hashes::Add(const unsigned char * const Data, unsigned long long const Size)
 {
+   if (Size == 0)
+      return true;
    bool Res = true;
 APT_IGNORE_DEPRECATED_PUSH
    if ((d->CalcHashes & MD5SUM) == MD5SUM)
@@ -372,19 +404,8 @@ APT_IGNORE_DEPRECATED_POP
    return hashes;
 }
 APT_IGNORE_DEPRECATED_PUSH
-Hashes::Hashes() { d = new PrivateHashes(~0); }
-Hashes::Hashes(unsigned int const Hashes) { d = new PrivateHashes(Hashes); }
-Hashes::Hashes(HashStringList const &Hashes) {
-   unsigned int calcHashes = Hashes.usable() ? 0 : ~0;
-   if (Hashes.find("MD5Sum") != NULL)
-      calcHashes |= MD5SUM;
-   if (Hashes.find("SHA1") != NULL)
-      calcHashes |= SHA1SUM;
-   if (Hashes.find("SHA256") != NULL)
-      calcHashes |= SHA256SUM;
-   if (Hashes.find("SHA512") != NULL)
-      calcHashes |= SHA512SUM;
-   d = new PrivateHashes(calcHashes);
-}
+Hashes::Hashes() : d(new PrivateHashes(~0)) { }
+Hashes::Hashes(unsigned int const Hashes) : d(new PrivateHashes(Hashes)) {}
+Hashes::Hashes(HashStringList const &Hashes) : d(new PrivateHashes(Hashes)) {}
 Hashes::~Hashes() { delete d; }
 APT_IGNORE_DEPRECATED_POP