improve umask/fchmod code readability

[apt.git] / apt-pkg / contrib / hashes.cc

diff --git a/apt-pkg/contrib/hashes.cc b/apt-pkg/contrib/hashes.cc
index b725e94187faa00f352eab71676fb2753e60522d..1fce0d75fdd8878d91e251805a94e594e8c7348d 100644 (file)
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -11,30 +11,179 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
+#include <config.h>
+
 #include <apt-pkg/hashes.h>
-    
-#include <unistd.h>    
-#include <system.h>    
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/md5.h>
+#include <apt-pkg/sha1.h>
+#include <apt-pkg/sha2.h>
+
+#include <stddef.h>
+#include <algorithm>
+#include <unistd.h>
+#include <string>
+#include <iostream>
+                                                                       /*}}}*/
+
+const char* HashString::_SupportedHashes[] = 
+{
+   "SHA512", "SHA256", "SHA1", "MD5Sum", NULL
+};
+
+HashString::HashString()
+{
+}
+
+HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash)
+{
+}
+
+HashString::HashString(std::string StringedHash)                       /*{{{*/
+{
+   // legacy: md5sum without "MD5Sum:" prefix
+   if (StringedHash.find(":") == std::string::npos && StringedHash.size() == 32)
+   {
+      Type = "MD5Sum";
+      Hash = StringedHash;
+      return;
+   }
+   std::string::size_type pos = StringedHash.find(":");
+   Type = StringedHash.substr(0,pos);
+   Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
+
+   if(_config->FindB("Debug::Hashes",false) == true)
+      std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
+}
+                                                                       /*}}}*/
+bool HashString::VerifyFile(std::string filename) const                        /*{{{*/
+{
+   std::string fileHash = GetHashForFile(filename);
+
+   if(_config->FindB("Debug::Hashes",false) == true)
+      std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
+
+   return (fileHash == Hash);
+}
+                                                                       /*}}}*/
+bool HashString::FromFile(std::string filename)                        /*{{{*/
+{
+   // pick the strongest hash
+   if (Type == "")
+      Type = _SupportedHashes[0];
+
+   Hash = GetHashForFile(filename);
+   return true;
+}
+                                                                       /*}}}*/
+std::string HashString::GetHashForFile(std::string filename) const      /*{{{*/
+{
+   std::string fileHash;
+
+   FileFd Fd(filename, FileFd::ReadOnly);
+   if(Type == "MD5Sum")
+   {
+      MD5Summation MD5;
+      MD5.AddFD(Fd);
+      fileHash = (std::string)MD5.Result();
+   }
+   else if (Type == "SHA1")
+   {
+      SHA1Summation SHA1;
+      SHA1.AddFD(Fd);
+      fileHash = (std::string)SHA1.Result();
+   }
+   else if (Type == "SHA256")
+   {
+      SHA256Summation SHA256;
+      SHA256.AddFD(Fd);
+      fileHash = (std::string)SHA256.Result();
+   }
+   else if (Type == "SHA512")
+   {
+      SHA512Summation SHA512;
+      SHA512.AddFD(Fd);
+      fileHash = (std::string)SHA512.Result();
+   }
+   Fd.Close();
+
+   return fileHash;
+}
                                                                        /*}}}*/
+const char** HashString::SupportedHashes()
+{
+   return _SupportedHashes;
+}
+
+APT_PURE bool HashString::empty() const
+{
+   return (Type.empty() || Hash.empty());
+}
+
+std::string HashString::toStr() const
+{
+   return Type + std::string(":") + Hash;
+}
 
 // Hashes::AddFD - Add the contents of the FD                          /*{{{*/
 // ---------------------------------------------------------------------
 /* */
-bool Hashes::AddFD(int Fd,unsigned long Size)
+bool Hashes::AddFD(int const Fd,unsigned long long Size, bool const addMD5,
+                  bool const addSHA1, bool const addSHA256, bool const addSHA512)
 {
    unsigned char Buf[64*64];
-   int Res = 0;
-   while (Size != 0)
+   bool const ToEOF = (Size == 0);
+   while (Size != 0 || ToEOF)
    {
-      Res = read(Fd,Buf,min(Size,(unsigned long)sizeof(Buf)));
-      if (Res < 0 || (unsigned)Res != min(Size,(unsigned long)sizeof(Buf)))
+      unsigned long long n = sizeof(Buf);
+      if (!ToEOF) n = std::min(Size, n);
+      ssize_t const Res = read(Fd,Buf,n);
+      if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read
         return false;
+      if (ToEOF && Res == 0) // EOF
+        break;
       Size -= Res;
-      MD5.Add(Buf,Res);
-      SHA1.Add(Buf,Res);
-      SHA256.Add(Buf,Res);
+      if (addMD5 == true)
+        MD5.Add(Buf,Res);
+      if (addSHA1 == true)
+        SHA1.Add(Buf,Res);
+      if (addSHA256 == true)
+        SHA256.Add(Buf,Res);
+      if (addSHA512 == true)
+        SHA512.Add(Buf,Res);
+   }
+   return true;
+}
+bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, bool const addMD5,
+                  bool const addSHA1, bool const addSHA256, bool const addSHA512)
+{
+   unsigned char Buf[64*64];
+   bool const ToEOF = (Size == 0);
+   while (Size != 0 || ToEOF)
+   {
+      unsigned long long n = sizeof(Buf);
+      if (!ToEOF) n = std::min(Size, n);
+      unsigned long long a = 0;
+      if (Fd.Read(Buf, n, &a) == false) // error
+        return false;
+      if (ToEOF == false)
+      {
+        if (a != n) // short read
+           return false;
+      }
+      else if (a == 0) // EOF
+        break;
+      Size -= a;
+      if (addMD5 == true)
+        MD5.Add(Buf, a);
+      if (addSHA1 == true)
+        SHA1.Add(Buf, a);
+      if (addSHA256 == true)
+        SHA256.Add(Buf, a);
+      if (addSHA512 == true)
+        SHA512.Add(Buf, a);
    }
    return true;
 }
                                                                        /*}}}*/
-