merged from lp:~donkult/apt/experimental

5 files changed, 121 insertions, 22 deletions

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index a98c2cb85..b350973af 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -75,7 +75,9 @@ class FileFdPrivate {
 	bool pipe;
 	APT::Configuration::Compressor compressor;
 	unsigned int openmode;
-	FileFdPrivate() : gz(NULL), compressed_fd(-1), compressor_pid(-1), pipe(false) {};
+	unsigned long long seekpos;
+	FileFdPrivate() : gz(NULL), compressed_fd(-1), compressor_pid(-1), pipe(false),
+			  openmode(0), seekpos(0) {};
 };
 
 // RunScripts - Run a set of scripts from a configuration subtree	/*{{{*/
@@ -1065,6 +1067,7 @@ bool FileFd::Read(void *To,unsigned long long Size,unsigned long long *Actual)
       
       To = (char *)To + Res;
       Size -= Res;
+      d->seekpos += Res;
       if (Actual != 0)
 	 *Actual += Res;
    }
@@ -1097,15 +1100,19 @@ char* FileFd::ReadLine(char *To, unsigned long long const Size)
 #endif
 
    unsigned long long read = 0;
-   if (Read(To, Size, &read) == false)
+   while ((Size - 1) != read)
+   {
+      unsigned long long done = 0;
+      if (Read(To + read, 1, &done) == false)
+	 return NULL;
+      if (done == 0)
+	 break;
+      if (To[read++] == '\n')
+	 break;
+   }
+   if (read == 0)
       return NULL;
-   char* c = To;
-   for (; *c != '\n' && *c != '\0' && read != 0; --read, ++c)
-      ; // find the end of the line
-   if (*c != '\0')
-      *c = '\0';
-   if (read != 0)
-      Seek(Tell() - read);
+   To[read] = '\0';
    return To;
 }
 									/*}}}*/
@@ -1134,6 +1141,7 @@ bool FileFd::Write(const void *From,unsigned long long Size)
       
       From = (char *)From + Res;
       Size -= Res;
+      d->seekpos += Res;
    }
    while (Res > 0 && Size > 0);
    
@@ -1151,6 +1159,13 @@ bool FileFd::Seek(unsigned long long To)
 {
    if (d->pipe == true)
    {
+      // Our poor man seeking in pipes is costly, so try to avoid it
+      unsigned long long seekpos = Tell();
+      if (seekpos == To)
+	 return true;
+      else if (seekpos < To)
+	 return Skip(To - seekpos);
+
       if ((d->openmode & ReadOnly) != ReadOnly)
 	 return _error->Error("Reopen is only implemented for read-only files!");
       close(iFd);
@@ -1173,6 +1188,8 @@ bool FileFd::Seek(unsigned long long To)
 
       if (To != 0)
 	 return Skip(To);
+
+      d->seekpos = To;
       return true;
    }
    int res;
@@ -1187,7 +1204,8 @@ bool FileFd::Seek(unsigned long long To)
       Flags |= Fail;
       return _error->Error("Unable to seek to %llu", To);
    }
-   
+
+   d->seekpos = To;
    return true;
 }
 									/*}}}*/
@@ -1196,6 +1214,20 @@ bool FileFd::Seek(unsigned long long To)
 /* */
 bool FileFd::Skip(unsigned long long Over)
 {
+   if (d->pipe == true)
+   {
+      d->seekpos += Over;
+      char buffer[1024];
+      while (Over != 0)
+      {
+	 unsigned long long toread = std::min((unsigned long long) sizeof(buffer), Over);
+	 if (Read(buffer, toread) == false)
+	    return _error->Error("Unable to seek ahead %llu",Over);
+	 Over -= toread;
+      }
+      return true;
+   }
+
    int res;
 #if APT_USE_ZLIB
    if (d->gz != NULL)
@@ -1208,7 +1240,8 @@ bool FileFd::Skip(unsigned long long Over)
       Flags |= Fail;
       return _error->Error("Unable to seek ahead %llu",Over);
    }
-   
+   d->seekpos = res;
+
    return true;
 }
 									/*}}}*/
@@ -1236,6 +1269,13 @@ bool FileFd::Truncate(unsigned long long To)
 /* */
 unsigned long long FileFd::Tell()
 {
+   // In theory, we could just return seekpos here always instead of
+   // seeking around, but not all users of FileFd use always Seek() and co
+   // so d->seekpos isn't always true and we can just use it as a hint if
+   // we have nothing else, but not always as an authority…
+   if (d->pipe == true)
+      return d->seekpos;
+
    off_t Res;
 #if APT_USE_ZLIB
    if (d->gz != NULL)
@@ -1245,6 +1285,7 @@ unsigned long long FileFd::Tell()
      Res = lseek(iFd,0,SEEK_CUR);
    if (Res == (off_t)-1)
       _error->Errno("lseek","Failed to determine the current file position");
+   d->seekpos = Res;
    return Res;
 }
 									/*}}}*/
@@ -1281,15 +1322,14 @@ unsigned long long FileFd::Size()
    // so we 'read' the content and 'seek' back - see there
    if (d->pipe == true)
    {
-      // FIXME: If we have read first and then FileSize() the report is wrong
-      size = 0;
+      unsigned long long const oldSeek = Tell();
       char ignore[1000];
       unsigned long long read = 0;
       do {
 	 Read(ignore, sizeof(ignore), &read);
-	 size += read;
       } while(read != 0);
-      Seek(0);
+      size = Tell();
+      Seek(oldSeek);
    }
 #if APT_USE_ZLIB
    // only check gzsize if we are actually a gzip file, just checking for
@@ -1301,7 +1341,6 @@ unsigned long long FileFd::Size()
 	* this ourselves; the original (uncompressed) file size is the last 32
 	* bits of the file */
        // FIXME: Size for gz-files is limited by 32bit… no largefile support
-       off_t orig_pos = lseek(iFd, 0, SEEK_CUR);
        if (lseek(iFd, -4, SEEK_END) < 0)
 	   return _error->Errno("lseek","Unable to seek to end of gzipped file");
        size = 0L;
@@ -1315,7 +1354,7 @@ unsigned long long FileFd::Size()
        size = tmp_size;
 #endif
 
-       if (lseek(iFd, orig_pos, SEEK_SET) < 0)
+       if (lseek(iFd, d->seekpos, SEEK_SET) < 0)
 	   return _error->Errno("lseek","Unable to seek in gzipped file");
        return size;
    }
diff --git a/apt-pkg/contrib/hashes.cc b/apt-pkg/contrib/hashes.cc
index 05001f042..e1a431823 100644
--- a/apt-pkg/contrib/hashes.cc
+++ b/apt-pkg/contrib/hashes.cc
@@ -61,25 +61,25 @@ bool HashString::VerifyFile(std::string filename) const			/*{{{*/
    if(Type == "MD5Sum")
    {
       MD5Summation MD5;
-      MD5.AddFD(Fd.Fd(), Fd.Size());
+      MD5.AddFD(Fd);
       fileHash = (std::string)MD5.Result();
    }
    else if (Type == "SHA1")
    {
       SHA1Summation SHA1;
-      SHA1.AddFD(Fd.Fd(), Fd.Size());
+      SHA1.AddFD(Fd);
       fileHash = (std::string)SHA1.Result();
    }
    else if (Type == "SHA256")
    {
       SHA256Summation SHA256;
-      SHA256.AddFD(Fd.Fd(), Fd.Size());
+      SHA256.AddFD(Fd);
       fileHash = (std::string)SHA256.Result();
    }
    else if (Type == "SHA512")
    {
       SHA512Summation SHA512;
-      SHA512.AddFD(Fd.Fd(), Fd.Size());
+      SHA512.AddFD(Fd);
       fileHash = (std::string)SHA512.Result();
    }
    Fd.Close();
@@ -135,5 +135,35 @@ bool Hashes::AddFD(int const Fd,unsigned long long Size, bool const addMD5,
    }
    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;
+}
 									/*}}}*/
-
diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
index b206eccb8..0c0b6c6a7 100644
--- a/apt-pkg/contrib/hashes.h
+++ b/apt-pkg/contrib/hashes.h
@@ -17,6 +17,7 @@
 #include <apt-pkg/md5.h>
 #include <apt-pkg/sha1.h>
 #include <apt-pkg/sha2.h>
+#include <apt-pkg/fileutl.h>
 
 #include <algorithm>
 #include <vector>
@@ -74,6 +75,10 @@ class Hashes
    { return AddFD(Fd, Size, true, true, true, true); };
    bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
 	      bool const addSHA1, bool const addSHA256, bool const addSHA512);
+   inline bool AddFD(FileFd &Fd,unsigned long long Size = 0)
+   { return AddFD(Fd, Size, true, true, true, true); };
+   bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
+	      bool const addSHA1, bool const addSHA256, bool const addSHA512);
    inline bool Add(const unsigned char *Beg,const unsigned char *End) 
                   {return Add(Beg,End-Beg);};
 };
diff --git a/apt-pkg/contrib/hashsum.cc b/apt-pkg/contrib/hashsum.cc
index ff3b112bb..289e43aa4 100644
--- a/apt-pkg/contrib/hashsum.cc
+++ b/apt-pkg/contrib/hashsum.cc
@@ -25,4 +25,26 @@ bool SummationImplementation::AddFD(int const Fd, unsigned long long Size) {
    }
    return true;
 }
+bool SummationImplementation::AddFD(FileFd &Fd, unsigned long long Size) {
+   unsigned char Buf[64 * 64];
+   bool 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;
+      Add(Buf, a);
+   }
+   return true;
+}
 									/*}}}*/
diff --git a/apt-pkg/contrib/hashsum_template.h b/apt-pkg/contrib/hashsum_template.h
index 6301ac9d0..51e3b0862 100644
--- a/apt-pkg/contrib/hashsum_template.h
+++ b/apt-pkg/contrib/hashsum_template.h
@@ -10,6 +10,8 @@
 #ifndef APTPKG_HASHSUM_TEMPLATE_H
 #define APTPKG_HASHSUM_TEMPLATE_H
 
+#include <apt-pkg/fileutl.h>
+
 #include <string>
 #include <cstring>
 #include <algorithm>
@@ -108,6 +110,7 @@ class SummationImplementation
    { return Add((const unsigned char *)Beg, End - Beg); };
 
    bool AddFD(int Fd, unsigned long long Size = 0);
+   bool AddFD(FileFd &Fd, unsigned long long Size = 0);
 };
 
 #endif