io::uncompress::anyinflate.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

\&\s-1TODO\s0
.SH "Methods"
.IX Header "Methods"
.Sh "read"
.IX Subsection "read"
Usage is
.PP
.Vb 1
\&    $status = $z\->read($buffer)
.Ve
.PP
Reads a block of compressed data (the size the the compressed block is
determined by the \f(CW\*(C`Buffer\*(C'\fR option in the constructor), uncompresses it and
writes any uncompressed data into \f(CW$buffer\fR. If the \f(CW\*(C`Append\*(C'\fR parameter is
set in the constructor, the uncompressed data will be appended to the
\&\f(CW$buffer\fR parameter. Otherwise \f(CW$buffer\fR will be overwritten.
.PP
Returns the number of uncompressed bytes written to \f(CW$buffer\fR, zero if eof
or a negative number on error.
.Sh "read"
.IX Subsection "read"
Usage is
.PP
.Vb 2
\&    $status = $z\->read($buffer, $length)
\&    $status = $z\->read($buffer, $length, $offset)
\&
\&    $status = read($z, $buffer, $length)
\&    $status = read($z, $buffer, $length, $offset)
.Ve
.PP
Attempt to read \f(CW$length\fR bytes of uncompressed data into \f(CW$buffer\fR.
.PP
The main difference between this form of the \f(CW\*(C`read\*(C'\fR method and the
previous one, is that this one will attempt to return \fIexactly\fR \f(CW$length\fR
bytes. The only circumstances that this function will not is if end-of-file
or an \s-1IO\s0 error is encountered.
.PP
Returns the number of uncompressed bytes written to \f(CW$buffer\fR, zero if eof
or a negative number on error.
.Sh "getline"
.IX Subsection "getline"
Usage is
.PP
.Vb 2
\&    $line = $z\->getline()
\&    $line = <$z>
.Ve
.PP
Reads a single line.
.PP
This method fully supports the use of of the variable \f(CW$/\fR (or
\&\f(CW$INPUT_RECORD_SEPARATOR\fR or \f(CW$RS\fR when \f(CW\*(C`English\*(C'\fR is in use) to
determine what constitutes an end of line. Paragraph mode, record mode and
file slurp mode are all supported.
.Sh "getc"
.IX Subsection "getc"
Usage is
.PP
.Vb 1
\&    $char = $z\->getc()
.Ve
.PP
Read a single character.
.Sh "ungetc"
.IX Subsection "ungetc"
Usage is
.PP
.Vb 1
\&    $char = $z\->ungetc($string)
.Ve
.Sh "inflateSync"
.IX Subsection "inflateSync"
Usage is
.PP
.Vb 1
\&    $status = $z\->inflateSync()
.Ve
.PP
\&\s-1TODO\s0
.Sh "getHeaderInfo"
.IX Subsection "getHeaderInfo"
Usage is
.PP
.Vb 2
\&    $hdr  = $z\->getHeaderInfo();
\&    @hdrs = $z\->getHeaderInfo();
.Ve
.PP
This method returns either a hash reference (in scalar context) or a list
or hash references (in array context) that contains information about each
of the header fields in the compressed data stream(s).
.Sh "tell"
.IX Subsection "tell"
Usage is
.PP
.Vb 2
\&    $z\->tell()
\&    tell $z
.Ve
.PP
Returns the uncompressed file offset.
.Sh "eof"
.IX Subsection "eof"
Usage is
.PP
.Vb 2
\&    $z\->eof();
\&    eof($z);
.Ve
.PP
Returns true if the end of the compressed input stream has been reached.
.Sh "seek"
.IX Subsection "seek"
.Vb 2
\&    $z\->seek($position, $whence);
\&    seek($z, $position, $whence);
.Ve
.PP
Provides a sub-set of the \f(CW\*(C`seek\*(C'\fR functionality, with the restriction
that it is only legal to seek forward in the input file/buffer.
It is a fatal error to attempt to seek backward.
.PP
The \f(CW$whence\fR parameter takes one the usual values, namely \s-1SEEK_SET\s0,
\&\s-1SEEK_CUR\s0 or \s-1SEEK_END\s0.
.PP
Returns 1 on success, 0 on failure.
.Sh "binmode"
.IX Subsection "binmode"
Usage is
.PP
.Vb 2
\&    $z\->binmode
\&    binmode $z ;
.Ve
.PP
This is a noop provided for completeness.
.Sh "opened"
.IX Subsection "opened"
.Vb 1
\&    $z\->opened()
.Ve
.PP
Returns true if the object currently refers to a opened file/buffer.
.Sh "autoflush"
.IX Subsection "autoflush"
.Vb 2
\&    my $prev = $z\->autoflush()
\&    my $prev = $z\->autoflush(EXPR)
.Ve
.PP
If the \f(CW$z\fR object is associated with a file or a filehandle, this method
returns the current autoflush setting for the underlying filehandle. If
\&\f(CW\*(C`EXPR\*(C'\fR is present, and is non-zero, it will enable flushing after every
write/print operation.
.PP
If \f(CW$z\fR is associated with a buffer, this method has no effect and always
returns \f(CW\*(C`undef\*(C'\fR.
.PP
\&\fBNote\fR that the special variable \f(CW$|\fR \fBcannot\fR be used to set or
retrieve the autoflush setting.
.Sh "input_line_number"
.IX Subsection "input_line_number"
.Vb 2
\&    $z\->input_line_number()
\&    $z\->input_line_number(EXPR)
.Ve
.PP
Returns the current uncompressed line number. If \f(CW\*(C`EXPR\*(C'\fR is present it has
the effect of setting the line number. Note that setting the line number
does not change the current position within the file/buffer being read.
.PP
The contents of \f(CW$/\fR are used to to determine what constitutes a line
terminator.
.Sh "fileno"
.IX Subsection "fileno"
.Vb 2
\&    $z\->fileno()
\&    fileno($z)
.Ve
.PP
If the \f(CW$z\fR object is associated with a file or a filehandle, this method
will return the underlying file descriptor.
.PP
If the \f(CW$z\fR object is is associated with a buffer, this method will
return undef.
.Sh "close"
.IX Subsection "close"
.Vb 2
\&    $z\->close() ;
\&    close $z ;
.Ve
.PP
Closes the output file/buffer.
.PP
For most versions of Perl this method will be automatically invoked if
the IO::Uncompress::AnyInflate object is destroyed (either explicitly or by the
variable with the reference to the object going out of scope). The
exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
these cases, the \f(CW\*(C`close\*(C'\fR method will be called automatically, but
not until global destruction of all live objects when the program is
terminating.
.PP
Therefore, if you want your scripts to be able to run on all versions
of Perl, you should call \f(CW\*(C`close\*(C'\fR explicitly and not rely on automatic
closing.
.PP
Returns true on success, otherwise 0.
.PP
If the \f(CW\*(C`AutoClose\*(C'\fR option has been enabled when the IO::Uncompress::AnyInflate
object was created, and the object is associated with a file, the
underlying file will also be closed.
.Sh "nextStream"
.IX Subsection "nextStream"
Usage is
.PP
.Vb 1
\&    my $status = $z\->nextStream();
.Ve
.PP
Skips to the next compressed data stream in the input file/buffer. If a new
compressed data stream is found, the eof marker will be cleared and \f(CW$.\fR
will be reset to 0.
.PP
Returns 1 if a new stream was found, 0 if none was found, and \-1 if an
error was encountered.
.Sh "trailingData"
.IX Subsection "trailingData"
Usage is
.PP
.Vb 1
\&    my $data = $z\->trailingData();
.Ve
.PP
Returns the data, if any, that is present immediately after the compressed
data stream once uncompression is complete. It only makes sense to call
this method once the end of the compressed data stream has been
encountered.
.PP
This option can be used when there is useful information immediately
following the compressed data stream, and you don't know the length of the
compressed data stream.
.PP
If the input is a buffer, \f(CW\*(C`trailingData\*(C'\fR will return everything from the
end of the compressed data stream to the end of the buffer.
.PP
If the input is a filehandle, \f(CW\*(C`trailingData\*(C'\fR will return the data that is
left in the filehandle input buffer once the end of the compressed data
stream has been reached. You can then use the filehandle to read the rest
of the input file.
.PP
Don't bother using \f(CW\*(C`trailingData\*(C'\fR if the input is a filename.
.PP
If you know the length of the compressed data stream before you start
uncompressing, you can avoid having to use \f(CW\*(C`trailingData\*(C'\fR by setting the
\&\f(CW\*(C`InputLength\*(C'\fR option in the constructor.
.SH "Importing"
.IX Header "Importing"
No symbolic constants are required by this IO::Uncompress::AnyInflate at present.
.IP ":all" 5
.IX Item ":all"
Imports \f(CW\*(C`anyinflate\*(C'\fR and \f(CW$AnyInflateError\fR.
Same as doing this
.Sp
.Vb 1
\&    use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ;
.Ve
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Compress::Zlib, IO::Compress::Gzip, IO::Uncompress::Gunzip, IO::Compress::Deflate, IO::Uncompress::Inflate, IO::Compress::RawDeflate, IO::Uncompress::RawInflate, IO::Compress::Bzip2, IO::Uncompress::Bunzip2, IO::Compress::Lzop, IO::Uncompress::UnLzop, IO::Compress::Lzf, IO::Uncompress::UnLzf, IO::Uncompress::AnyUncompress
.PP
Compress::Zlib::FAQ
.PP
File::GlobMapper, Archive::Zip,
Archive::Tar,
IO::Zlib
.PP
For \s-1RFC\s0 1950, 1951 and 1952 see 
\&\fIhttp://www.faqs.org/rfcs/rfc1950.html\fR,
\&\fIhttp://www.faqs.org/rfcs/rfc1951.html\fR and
\&\fIhttp://www.faqs.org/rfcs/rfc1952.html\fR
.PP
The \fIzlib\fR compression library was written by Jean-loup Gailly
\&\[e-mail]\fR and Mark Adler \[e-mail]\fR.
.PP
The primary site for the \fIzlib\fR compression library is
\&\fIhttp://www.zlib.org\fR.
.PP
The primary site for gzip is \fIhttp://www.gzip.org\fR.
.SH "AUTHOR"
.IX Header "AUTHOR"
This module was written by Paul Marquess, \[e-mail]\fR.
.SH "MODIFICATION HISTORY"
.IX Header "MODIFICATION HISTORY"
See the Changes file.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2005\-2007 Paul Marquess. All rights reserved.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.