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authormartin@piware.de <>2010-06-09 14:08:20 +0200
committermartin@piware.de <>2010-06-09 14:08:20 +0200
commita3a03f5d7436c870edac9c0eb92e85e1fcaf6bca (patch)
tree652d78aff1b666164f8a3c1cd0f1f2eb7ab687fb /apt-pkg/contrib/fileutl.cc
parent3000cb123abe00418ccc2e388b6f93b76fe5514d (diff)
* apt-pkg/contrib/fileutl.{h,cc}:
- Add support for transparent reading of gzipped files. - Link against zlib (in apt-pkg/makefile) and add zlib build dependency.
Diffstat (limited to 'apt-pkg/contrib/fileutl.cc')
-rw-r--r--apt-pkg/contrib/fileutl.cc47
1 files changed, 41 insertions, 6 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index da32983f1..11a9e7f7b 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
@@ -603,6 +604,13 @@ bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
{
case ReadOnly:
iFd = open(FileName.c_str(),O_RDONLY);
+ if (iFd > 0 && FileName.compare(FileName.size()-3, 3, ".gz") == 0) {
+ gz = gzdopen (iFd, "r");
+ if (gz == NULL) {
+ close (iFd);
+ iFd = -1;
+ }
+ }
break;
case WriteEmpty:
@@ -658,7 +666,10 @@ 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)
@@ -697,7 +708,10 @@ 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)
@@ -723,7 +737,12 @@ 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);
@@ -737,7 +756,12 @@ 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);
@@ -751,6 +775,11 @@ 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;
@@ -765,7 +794,11 @@ 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;
@@ -776,6 +809,7 @@ 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");
@@ -789,9 +823,10 @@ bool FileFd::Close()
{
bool Res = true;
if ((Flags & AutoClose) == AutoClose)
- if (iFd >= 0 && close(iFd) != 0)
+ if ((gz != NULL && gzclose(gz) != 0) || (gz == NULL && iFd > 0 && close(iFd) != 0))
Res &= _error->Errno("close",_("Problem closing the file"));
iFd = -1;
+ gz = NULL;
if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
FileName.empty() == false)