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 52b9bfbe6c78e18ce24d02119a56a610d93b21a2..1fce0d75fdd8878d91e251805a94e594e8c7348d 100644 (file)
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -11,39 +11,45 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
+#include <config.h>
+
 #include <apt-pkg/hashes.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/configuration.h>
-    
-#include <unistd.h>    
-#include <system.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[] = 
 {
-   "SHA256", "SHA1", "MD5Sum", NULL
+   "SHA512", "SHA256", "SHA1", "MD5Sum", NULL
 };
 
 HashString::HashString()
 {
 }
 
-HashString::HashString(string Type, string Hash) : Type(Type), Hash(Hash)
+HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash)
 {
 }
 
-HashString::HashString(string StringedHash)                            /*{{{*/
+HashString::HashString(std::string StringedHash)                       /*{{{*/
 {
    // legacy: md5sum without "MD5Sum:" prefix
-   if (StringedHash.find(":") == string::npos && StringedHash.size() == 32)
+   if (StringedHash.find(":") == std::string::npos && StringedHash.size() == 32)
    {
       Type = "MD5Sum";
       Hash = StringedHash;
       return;
    }
-   string::size_type pos = StringedHash.find(":");
+   std::string::size_type pos = StringedHash.find(":");
    Type = StringedHash.substr(0,pos);
    Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
 
@@ -51,36 +57,58 @@ HashString::HashString(string StringedHash)                         /*{{{*/
       std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
 }
                                                                        /*}}}*/
-bool HashString::VerifyFile(string filename) const                     /*{{{*/
+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      /*{{{*/
 {
-   FileFd fd;
-   MD5Summation MD5;
-   SHA1Summation SHA1;
-   SHA256Summation SHA256;
-   string fileHash;
+   std::string fileHash;
 
    FileFd Fd(filename, FileFd::ReadOnly);
-   if(Type == "MD5Sum") 
+   if(Type == "MD5Sum")
    {
-      MD5.AddFD(Fd.Fd(), Fd.Size());
-      fileHash = (string)MD5.Result();
-   } 
+      MD5Summation MD5;
+      MD5.AddFD(Fd);
+      fileHash = (std::string)MD5.Result();
+   }
    else if (Type == "SHA1")
    {
-      SHA1.AddFD(Fd.Fd(), Fd.Size());
-      fileHash = (string)SHA1.Result();
-   } 
-   else if (Type == "SHA256") 
+      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")
    {
-      SHA256.AddFD(Fd.Fd(), Fd.Size());
-      fileHash = (string)SHA256.Result();
+      SHA512Summation SHA512;
+      SHA512.AddFD(Fd);
+      fileHash = (std::string)SHA512.Result();
    }
    Fd.Close();
 
-   if(_config->FindB("Debug::Hashes",false) == true)
-      std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
-
-   return (fileHash == Hash);
+   return fileHash;
 }
                                                                        /*}}}*/
 const char** HashString::SupportedHashes()
@@ -88,34 +116,74 @@ const char** HashString::SupportedHashes()
    return _SupportedHashes;
 }
 
-bool HashString::empty() const
+APT_PURE bool HashString::empty() const
 {
    return (Type.empty() || Hash.empty());
 }
 
-string HashString::toStr() const
+std::string HashString::toStr() const
 {
-   return Type+string(":")+Hash;
+   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;
 }
                                                                        /*}}}*/
-