+ unsigned long long toread = std::min(buffersize, Over);
+ if (filefd->Read(buffer, toread) == false)
+ return filefd->FileFdError("Unable to seek ahead %llu",Over);
+ Over -= toread;
+ }
+ return true;
+ }
+ virtual bool InternalTruncate(unsigned long long const)
+ {
+ return filefd->FileFdError("Truncating compressed files is not implemented (%s)", filefd->FileName.c_str());
+ }
+ virtual unsigned long long InternalTell()
+ {
+ // 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…
+ return seekpos - buffer.size();
+ }
+ virtual unsigned long long InternalSize()
+ {
+ unsigned long long size = 0;
+ unsigned long long const oldSeek = filefd->Tell();
+ unsigned long long constexpr ignoresize = 1024;
+ char ignore[ignoresize];
+ unsigned long long read = 0;
+ do {
+ if (filefd->Read(ignore, ignoresize, &read) == false)
+ {
+ filefd->Seek(oldSeek);
+ return 0;
+ }
+ } while(read != 0);
+ size = filefd->Tell();
+ filefd->Seek(oldSeek);
+ return size;
+ }
+ virtual bool InternalClose(std::string const &FileName) = 0;
+ virtual bool InternalStream() const { return false; }
+ virtual bool InternalAlwaysAutoClose() const { return true; }
+
+ virtual ~FileFdPrivate() {}
+};
+ /*}}}*/
+class APT_HIDDEN BufferedWriteFileFdPrivate : public FileFdPrivate { /*{{{*/
+protected:
+ FileFdPrivate *wrapped;
+ simple_buffer writebuffer;
+
+public:
+
+ explicit BufferedWriteFileFdPrivate(FileFdPrivate *Priv) :
+ FileFdPrivate(Priv->filefd), wrapped(Priv) {};
+
+ virtual APT::Configuration::Compressor get_compressor() const override
+ {
+ return wrapped->get_compressor();
+ }
+ virtual void set_compressor(APT::Configuration::Compressor const &compressor) override
+ {
+ return wrapped->set_compressor(compressor);
+ }
+ virtual unsigned int get_openmode() const override
+ {
+ return wrapped->get_openmode();
+ }
+ virtual void set_openmode(unsigned int openmode) override
+ {
+ return wrapped->set_openmode(openmode);
+ }
+ virtual bool get_is_pipe() const override
+ {
+ return wrapped->get_is_pipe();
+ }
+ virtual void set_is_pipe(bool is_pipe) override
+ {
+ FileFdPrivate::set_is_pipe(is_pipe);
+ wrapped->set_is_pipe(is_pipe);
+ }
+ virtual unsigned long long get_seekpos() const override
+ {
+ return wrapped->get_seekpos();
+ }
+ virtual void set_seekpos(unsigned long long seekpos) override
+ {
+ return wrapped->set_seekpos(seekpos);
+ }
+ virtual bool InternalOpen(int const iFd, unsigned int const Mode) override
+ {
+ if (InternalFlush() == false)
+ return false;
+ return wrapped->InternalOpen(iFd, Mode);
+ }
+ virtual ssize_t InternalUnbufferedRead(void * const To, unsigned long long const Size) override
+ {
+ if (InternalFlush() == false)
+ return -1;
+ return wrapped->InternalUnbufferedRead(To, Size);
+
+ }
+ virtual bool InternalReadError() override
+ {
+ return wrapped->InternalReadError();
+ }
+ virtual char * InternalReadLine(char * To, unsigned long long Size) override
+ {
+ if (InternalFlush() == false)
+ return nullptr;
+ return wrapped->InternalReadLine(To, Size);
+ }
+ virtual bool InternalFlush() override
+ {
+ while (writebuffer.empty() == false) {
+ auto written = wrapped->InternalWrite(writebuffer.get(),
+ writebuffer.size());
+ // Ignore interrupted syscalls
+ if (written < 0 && errno == EINTR)
+ continue;
+ if (written < 0)
+ return false;
+
+ writebuffer.bufferstart += written;
+ }
+
+ writebuffer.reset();
+ return true;
+ }
+ virtual ssize_t InternalWrite(void const * const From, unsigned long long const Size) override
+ {
+ size_t written = 0;
+
+ while (written < Size) {
+ auto buffered = writebuffer.write(static_cast<char const*>(From) + written, Size - written);
+
+ written += buffered;
+
+ if (writebuffer.full() && InternalFlush() == false)
+ return -1;
+ }
+
+ return written;
+ }
+ virtual bool InternalWriteError()
+ {
+ return wrapped->InternalWriteError();
+ }
+ virtual bool InternalSeek(unsigned long long const To)
+ {
+ if (InternalFlush() == false)
+ return false;
+ return wrapped->InternalSeek(To);
+ }
+ virtual bool InternalSkip(unsigned long long Over)
+ {
+ if (InternalFlush() == false)
+ return false;
+ return wrapped->InternalSkip(Over);
+ }
+ virtual bool InternalTruncate(unsigned long long const Size)
+ {
+ if (InternalFlush() == false)
+ return false;
+ return wrapped->InternalTruncate(Size);
+ }
+ virtual unsigned long long InternalTell()
+ {
+ if (InternalFlush() == false)
+ return -1;
+ return wrapped->InternalTell();
+ }
+ virtual unsigned long long InternalSize()
+ {
+ if (InternalFlush() == false)
+ return -1;
+ return wrapped->InternalSize();
+ }
+ virtual bool InternalClose(std::string const &FileName)
+ {
+ return wrapped->InternalClose(FileName);
+ }
+ virtual bool InternalAlwaysAutoClose() const
+ {
+ return wrapped->InternalAlwaysAutoClose();
+ }
+ virtual ~BufferedWriteFileFdPrivate()
+ {
+ delete wrapped;
+ }
+};
+ /*}}}*/
+class APT_HIDDEN GzipFileFdPrivate: public FileFdPrivate { /*{{{*/
+#ifdef HAVE_ZLIB
+public:
+ gzFile gz;
+ virtual bool InternalOpen(int const iFd, unsigned int const Mode) override
+ {
+ if ((Mode & FileFd::ReadWrite) == FileFd::ReadWrite)
+ gz = gzdopen(iFd, "r+");
+ else if ((Mode & FileFd::WriteOnly) == FileFd::WriteOnly)
+ gz = gzdopen(iFd, "w");
+ else
+ gz = gzdopen(iFd, "r");
+ filefd->Flags |= FileFd::Compressed;
+ return gz != nullptr;
+ }
+ virtual ssize_t InternalUnbufferedRead(void * const To, unsigned long long const Size) override
+ {
+ return gzread(gz, To, Size);
+ }
+ virtual bool InternalReadError() override
+ {
+ int err;
+ char const * const errmsg = gzerror(gz, &err);
+ if (err != Z_ERRNO)
+ return filefd->FileFdError("gzread: %s (%d: %s)", _("Read error"), err, errmsg);
+ return FileFdPrivate::InternalReadError();
+ }
+ virtual char * InternalReadLine(char * To, unsigned long long Size) override
+ {
+ return gzgets(gz, To, Size);
+ }
+ virtual ssize_t InternalWrite(void const * const From, unsigned long long const Size) override
+ {
+ return gzwrite(gz,From,Size);
+ }
+ virtual bool InternalWriteError() override
+ {
+ int err;
+ char const * const errmsg = gzerror(gz, &err);
+ if (err != Z_ERRNO)
+ return filefd->FileFdError("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
+ return FileFdPrivate::InternalWriteError();
+ }
+ virtual bool InternalSeek(unsigned long long const To) override
+ {
+ off_t const res = gzseek(gz, To, SEEK_SET);
+ if (res != (off_t)To)
+ return filefd->FileFdError("Unable to seek to %llu", To);
+ seekpos = To;
+ buffer.reset();
+ return true;
+ }
+ virtual bool InternalSkip(unsigned long long Over) override
+ {
+ if (Over >= buffer.size())
+ {
+ Over -= buffer.size();
+ buffer.reset();
projects / apt.git / blobdiff