merged from lp:~donkult/apt/sid

4 files changed, 68 insertions, 19 deletions

diff --git a/apt-pkg/contrib/error.cc b/apt-pkg/contrib/error.cc
index 8cee21c9c..fbb6e4636 100644
--- a/apt-pkg/contrib/error.cc
+++ b/apt-pkg/contrib/error.cc
@@ -94,11 +94,10 @@ bool GlobalError::DebugE(const char *Function,const char *Description,...) {
 									/*}}}*/
 // GlobalError::InsertErrno - formats an error message with the errno	/*{{{*/
 bool GlobalError::InsertErrno(MsgType type, const char* Function,
-			      const char* Description, va_list const &args) {
+			      const char* Description, va_list &args) {
 	char S[400];
-	vsnprintf(S,sizeof(S),Description,args);
-	snprintf(S + strlen(S),sizeof(S) - strlen(S),
-	         " - %s (%i: %s)", Function, errno, strerror(errno));
+	snprintf(S, sizeof(S), "%s - %s (%i: %s)", Description,
+		 Function, errno, strerror(errno));
 	return Insert(type, S, args);
 }
 									/*}}}*/
@@ -141,7 +140,7 @@ bool GlobalError::Debug(const char *Description,...)
 									/*}}}*/
 // GlobalError::Insert - Insert a new item at the end			/*{{{*/
 bool GlobalError::Insert(MsgType type, const char* Description,
-			 va_list const &args) {
+			 va_list &args) {
 	char S[400];
 	vsnprintf(S,sizeof(S),Description,args);
 
diff --git a/apt-pkg/contrib/error.h b/apt-pkg/contrib/error.h
index 73735162d..e5517c2da 100644
--- a/apt-pkg/contrib/error.h
+++ b/apt-pkg/contrib/error.h
@@ -278,9 +278,9 @@ private:								/*{{{*/
 	std::list<MsgStack> Stacks;
 
 	bool InsertErrno(MsgType type, const char* Function,
-			 const char* Description, va_list const &args);
+			 const char* Description, va_list &args);
 	bool Insert(MsgType type, const char* Description,
-			 va_list const &args);
+			 va_list &args);
 									/*}}}*/
 };
 									/*}}}*/
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 8f7791a8a..49b2f3828 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -11,6 +11,7 @@
    Most of this source is placed in the Public Domain, do with it what 
    you will
    It was originally written by Jason Gunthorpe <jgg@debian.org>.
+   FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com>
    
    The exception is RunScripts() it is under the GPLv2
 
@@ -656,6 +657,17 @@ bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
       case ReadOnly:
       iFd = open(FileName.c_str(),O_RDONLY);
       break;
+
+      case ReadOnlyGzip:
+      iFd = open(FileName.c_str(),O_RDONLY);
+      if (iFd > 0) {
+	 gz = gzdopen (iFd, "r");
+	 if (gz == NULL) {
+	     close (iFd);
+	     iFd = -1;
+	 }
+      }
+      break;
       
       case WriteEmpty:
       {
@@ -711,7 +723,10 @@ bool FileFd::Read(void *To,unsigned long Size,unsigned long *Actual)
    
    do
    {
-      Res = read(iFd,To,Size);
+      if (gz != NULL)
+         Res = gzread(gz,To,Size);
+      else
+         Res = read(iFd,To,Size);
       if (Res < 0 && errno == EINTR)
 	 continue;
       if (Res < 0)
@@ -750,7 +765,10 @@ bool FileFd::Write(const void *From,unsigned long Size)
    errno = 0;
    do
    {
-      Res = write(iFd,From,Size);
+      if (gz != NULL)
+         Res = gzwrite(gz,From,Size);
+      else
+         Res = write(iFd,From,Size);
       if (Res < 0 && errno == EINTR)
 	 continue;
       if (Res < 0)
@@ -776,7 +794,12 @@ bool FileFd::Write(const void *From,unsigned long Size)
 /* */
 bool FileFd::Seek(unsigned long To)
 {
-   if (lseek(iFd,To,SEEK_SET) != (signed)To)
+   int res;
+   if (gz)
+      res = gzseek(gz,To,SEEK_SET);
+   else
+      res = lseek(iFd,To,SEEK_SET);
+   if (res != (signed)To)
    {
       Flags |= Fail;
       return _error->Error("Unable to seek to %lu",To);
@@ -790,7 +813,12 @@ bool FileFd::Seek(unsigned long To)
 /* */
 bool FileFd::Skip(unsigned long Over)
 {
-   if (lseek(iFd,Over,SEEK_CUR) < 0)
+   int res;
+   if (gz)
+      res = gzseek(gz,Over,SEEK_CUR);
+   else
+      res = lseek(iFd,Over,SEEK_CUR);
+   if (res < 0)
    {
       Flags |= Fail;
       return _error->Error("Unable to seek ahead %lu",Over);
@@ -804,6 +832,11 @@ bool FileFd::Skip(unsigned long Over)
 /* */
 bool FileFd::Truncate(unsigned long To)
 {
+   if (gz)
+   {
+      Flags |= Fail;
+      return _error->Error("Truncating gzipped files is not implemented (%s)", FileName.c_str());
+   }
    if (ftruncate(iFd,To) != 0)
    {
       Flags |= Fail;
@@ -818,7 +851,11 @@ bool FileFd::Truncate(unsigned long To)
 /* */
 unsigned long FileFd::Tell()
 {
-   off_t Res = lseek(iFd,0,SEEK_CUR);
+   off_t Res;
+   if (gz)
+     Res = gztell(gz);
+   else
+     Res = lseek(iFd,0,SEEK_CUR);
    if (Res == (off_t)-1)
       _error->Errno("lseek","Failed to determine the current file position");
    return Res;
@@ -829,6 +866,7 @@ unsigned long FileFd::Tell()
 /* */
 unsigned long FileFd::Size()
 {
+   //TODO: For gz, do we need the actual file size here or the uncompressed length?
    struct stat Buf;
    if (fstat(iFd,&Buf) != 0)
       return _error->Errno("fstat","Unable to determine the file size");
@@ -842,8 +880,16 @@ bool FileFd::Close()
 {
    bool Res = true;
    if ((Flags & AutoClose) == AutoClose)
-      if (iFd >= 0 && close(iFd) != 0)
-	 Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
+   {
+      if (gz != NULL) {
+	 int const e = gzclose(gz);
+	 // gzdopen() on empty files always fails with "buffer error" here, ignore that
+	 if (e != 0 && e != Z_BUF_ERROR)
+	    Res &= _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
+      } else
+	 if (iFd > 0 && close(iFd) != 0)
+	    Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
+   }
 
    if ((Flags & Replace) == Replace && iFd >= 0) {
       if (rename(TemporaryFileName.c_str(), FileName.c_str()) != 0)
@@ -853,6 +899,7 @@ bool FileFd::Close()
    }
 
    iFd = -1;
+   gz = NULL;
 
    if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
        FileName.empty() == false)
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index 528725f89..0f70ab722 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -26,6 +26,8 @@
 #include <string>
 #include <vector>
 
+#include <zlib.h>
+
 using std::string;
 
 class FileFd
@@ -38,9 +40,10 @@ class FileFd
    unsigned long Flags;
    string FileName;
    string TemporaryFileName;
-   
+   gzFile gz;
+
    public:
-   enum OpenMode {ReadOnly,WriteEmpty,WriteExists,WriteAny,WriteTemp};
+   enum OpenMode {ReadOnly,WriteEmpty,WriteExists,WriteAny,WriteTemp,ReadOnlyGzip};
    
    inline bool Read(void *To,unsigned long Size,bool AllowEof)
    {
@@ -71,12 +74,12 @@ class FileFd
    inline string &Name() {return FileName;};
    
    FileFd(string FileName,OpenMode Mode,unsigned long Perms = 0666) : iFd(-1), 
-            Flags(0) 
+            Flags(0), gz(NULL)
    {
       Open(FileName,Mode,Perms);
    };
-   FileFd(int Fd = -1) : iFd(Fd), Flags(AutoClose) {};
-   FileFd(int Fd,bool) : iFd(Fd), Flags(0) {};
+   FileFd(int Fd = -1) : iFd(Fd), Flags(AutoClose), gz(NULL) {};
+   FileFd(int Fd,bool) : iFd(Fd), Flags(0), gz(NULL) {};
    virtual ~FileFd();
 };