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.

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.\" ========================================================================
.\"
.IX Title "IO::Uncompress::AnyInflate 3"
.TH IO::Uncompress::AnyInflate 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
IO::Uncompress::AnyInflate \- Uncompress zlib\-based (zip, gzip) file/buffer
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ;
\&
\&    my $status = anyinflate $input => $output [,OPTS]
\&        or die "anyinflate failed: $AnyInflateError\en";
\&
\&    my $z = new IO::Uncompress::AnyInflate $input [OPTS] 
\&        or die "anyinflate failed: $AnyInflateError\en";
\&
\&    $status = $z\->read($buffer)
\&    $status = $z\->read($buffer, $length)
\&    $status = $z\->read($buffer, $length, $offset)
\&    $line = $z\->getline()
\&    $char = $z\->getc()
\&    $char = $z\->ungetc()
\&    $char = $z\->opened()
\&
\&    $status = $z\->inflateSync()
\&
\&    $data = $z\->trailingData()
\&    $status = $z\->nextStream()
\&    $data = $z\->getHeaderInfo()
\&    $z\->tell()
\&    $z\->seek($position, $whence)
\&    $z\->binmode()
\&    $z\->fileno()
\&    $z\->eof()
\&    $z\->close()
\&
\&    $AnyInflateError ;
\&
\&    # IO::File mode
\&
\&    <$z>
\&    read($z, $buffer);
\&    read($z, $buffer, $length);
\&    read($z, $buffer, $length, $offset);
\&    tell($z)
\&    seek($z, $position, $whence)
\&    binmode($z)
\&    fileno($z)
\&    eof($z)
\&    close($z)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides a Perl interface that allows the reading of
files/buffers that have been compressed in a number of formats that use the
zlib compression library.
.PP
The formats supported are
.IP "\s-1RFC\s0 1950" 5
.IX Item "RFC 1950"
.PD 0
.IP "\s-1RFC\s0 1951 (optionally)" 5
.IX Item "RFC 1951 (optionally)"
.IP "gzip (\s-1RFC\s0 1952)" 5
.IX Item "gzip (RFC 1952)"
.IP "zip" 5
.IX Item "zip"
.PD
.PP
The module will auto-detect which, if any, of the supported
compression formats is being used.
.SH "Functional Interface"
.IX Header "Functional Interface"
A top-level function, \f(CW\*(C`anyinflate\*(C'\fR, is provided to carry out
\&\*(L"one-shot\*(R" uncompression between buffers and/or files. For finer
control over the uncompression process, see the \*(L"\s-1OO\s0 Interface\*(R"
section.
.PP
.Vb 1
\&    use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ;
\&
\&    anyinflate $input => $output [,OPTS] 
\&        or die "anyinflate failed: $AnyInflateError\en";
.Ve
.PP
The functional interface needs Perl5.005 or better.
.ie n .Sh "anyinflate $input\fP => \f(CW$output [, \s-1OPTS\s0]"
.el .Sh "anyinflate \f(CW$input\fP => \f(CW$output\fP [, \s-1OPTS\s0]"
.IX Subsection "anyinflate $input => $output [, OPTS]"
\&\f(CW\*(C`anyinflate\*(C'\fR expects at least two parameters, \f(CW$input\fR and \f(CW$output\fR.
.PP
\fIThe \f(CI$input\fI parameter\fR
.IX Subsection "The $input parameter"
.PP
The parameter, \f(CW$input\fR, is used to define the source of
the compressed data.
.PP
It can take one of the following forms:
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$input\fR parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for reading and the input data
will be read from it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$input\fR parameter is a filehandle, the input data will be
read from it.
The string '\-' can be used as an alias for standard input.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$input\fR is a scalar reference, the input data will be read
from \f(CW$$input\fR.
.IP "An array reference" 5
.IX Item "An array reference"
If \f(CW$input\fR is an array reference, each element in the array must be a
filename.
.Sp
The input data will be read from each file in turn.
.Sp
The complete array will be walked to ensure that it only
contains valid filenames before any data is uncompressed.
.IP "An Input FileGlob string" 5
.IX Item "An Input FileGlob string"
If \f(CW$input\fR is a string that is delimited by the characters \*(L"<\*(R" and \*(L">\*(R"
\&\f(CW\*(C`anyinflate\*(C'\fR will assume that it is an \fIinput fileglob string\fR. The
input is the list of files that match the fileglob.
.Sp
If the fileglob does not match any files ...
.Sp
See File::GlobMapper for more details.
.PP
If the \f(CW$input\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.PP
\fIThe \f(CI$output\fI parameter\fR
.IX Subsection "The $output parameter"
.PP
The parameter \f(CW$output\fR is used to control the destination of the
uncompressed data. This parameter can take one of these forms.
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$output\fR parameter is a simple scalar, it is assumed to be a
filename.  This file will be opened for writing and the uncompressed
data will be written to it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$output\fR parameter is a filehandle, the uncompressed data
will be written to it.
The string '\-' can be used as an alias for standard output.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$output\fR is a scalar reference, the uncompressed data will be
stored in \f(CW$$output\fR.
.IP "An Array Reference" 5
.IX Item "An Array Reference"
If \f(CW$output\fR is an array reference, the uncompressed data will be
pushed onto the array.
.IP "An Output FileGlob" 5
.IX Item "An Output FileGlob"
If \f(CW$output\fR is a string that is delimited by the characters \*(L"<\*(R" and \*(L">\*(R"
\&\f(CW\*(C`anyinflate\*(C'\fR will assume that it is an \fIoutput fileglob string\fR. The
output is the list of files that match the fileglob.
.Sp
When \f(CW$output\fR is an fileglob string, \f(CW$input\fR must also be a fileglob
string. Anything else is an error.
.PP
If the \f(CW$output\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.Sh "Notes"
.IX Subsection "Notes"
When \f(CW$input\fR maps to multiple compressed files/buffers and \f(CW$output\fR is
a single file/buffer, after uncompression \f(CW$output\fR will contain a