Mass Deface
(?: //
(?:
(
[^@/\#?]+ #
) @
)?
( [^/:\#?]+ ) #
(?: : (\d+) )? #
)?
( / [^\#]*)? # (including query)
(?: \# (.*) )? #
$
}
# Phase one: parse
if {![regexp -- $URLmatcher $url -> proto user host port srvurl]} {
unset $token
return -code error "Unsupported URL: $url"
}
# Phase two: validate
if {$host eq ""} {
# Caller has to provide a host name; we do not have a "default host"
# that would enable us to handle relative URLs.
unset $token
return -code error "Missing host part: $url"
# Note that we don't check the hostname for validity here; if it's
# invalid, we'll simply fail to resolve it later on.
}
if {$port ne "" && $port > 65535} {
unset $token
return -code error "Invalid port number: $port"
}
# The user identification and resource identification parts of the URL can
# have encoded characters in them; take care!
if {$user ne ""} {
# Check for validity according to RFC 3986, Appendix A
set validityRE {(?xi)
^
(?: [-\w.~!$&'()*+,;=:] | %[0-9a-f][0-9a-f] )+
$
}
if {$state(-strict) && ![regexp -- $validityRE $user]} {
unset $token
# Provide a better error message in this error case
if {[regexp {(?i)%(?![0-9a-f][0-9a-f]).?.?} $user bad]} {
return -code error \
"Illegal encoding character usage \"$bad\" in URL user"
}
return -code error "Illegal characters in URL user"
}
}
if {$srvurl ne ""} {
# Check for validity according to RFC 3986, Appendix A
set validityRE {(?xi)
^
# Path part (already must start with / character)
(?: [-\w.~!$&'()*+,;=:@/] | %[0-9a-f][0-9a-f] )*
# Query part (optional, permits ? characters)
(?: \? (?: [-\w.~!$&'()*+,;=:@/?] | %[0-9a-f][0-9a-f] )* )?
$
}
if {$state(-strict) && ![regexp -- $validityRE $srvurl]} {
unset $token
# Provide a better error message in this error case
if {[regexp {(?i)%(?![0-9a-f][0-9a-f])..} $srvurl bad]} {
return -code error \
"Illegal encoding character usage \"$bad\" in URL path"
}
return -code error "Illegal characters in URL path"
}
} else {
set srvurl /
}
if {$proto eq ""} {
set proto http
}
if {![info exists urlTypes($proto)]} {
unset $token
return -code error "Unsupported URL type \"$proto\""
}
set defport [lindex $urlTypes($proto) 0]
set defcmd [lindex $urlTypes($proto) 1]
if {$port eq ""} {
set port $defport
}
if {![catch {$http(-proxyfilter) $host} proxy]} {
set phost [lindex $proxy 0]
set pport [lindex $proxy 1]
}
# OK, now reassemble into a full URL
set url ${proto}://
if {$user ne ""} {
append url $user
append url @
}
append url $host
if {$port != $defport} {
append url : $port
}
append url $srvurl
# Don't append the fragment!
set state(url) $url
# If a timeout is specified we set up the after event and arrange for an
# asynchronous socket connection.
set sockopts [list]
if {$state(-timeout) > 0} {
set state(after) [after $state(-timeout) \
[list http::reset $token timeout]]
lappend sockopts -async
}
# If we are using the proxy, we must pass in the full URL that includes
# the server name.
if {[info exists phost] && ($phost ne "")} {
set srvurl $url
set targetAddr [list $phost $pport]
} else {
set targetAddr [list $host $port]
}
# Proxy connections aren't shared among different hosts.
set state(socketinfo) $host:$port
# See if we are supposed to use a previously opened channel.
if {$state(-keepalive)} {
variable socketmap
if {[info exists socketmap($state(socketinfo))]} {
if {[catch {fconfigure $socketmap($state(socketinfo))}]} {
Log "WARNING: socket for $state(socketinfo) was closed"
unset socketmap($state(socketinfo))
} else {
set sock $socketmap($state(socketinfo))
Log "reusing socket $sock for $state(socketinfo)"
catch {fileevent $sock writable {}}
catch {fileevent $sock readable {}}
}
}
# don't automatically close this connection socket
set state(connection) {}
}
if {![info exists sock]} {
# Pass -myaddr directly to the socket command
if {[info exists state(-myaddr)]} {
lappend sockopts -myaddr $state(-myaddr)
}
if {[catch {eval $defcmd $sockopts $targetAddr} sock]} {
# something went wrong while trying to establish the connection.
# Clean up after events and such, but DON'T call the command
# callback (if available) because we're going to throw an
# exception from here instead.
set state(sock) $sock
Finish $token "" 1
cleanup $token
return -code error $sock
}
}
set state(sock) $sock
Log "Using $sock for $state(socketinfo)" \
[expr {$state(-keepalive)?"keepalive":""}]
if {$state(-keepalive)} {
set socketmap($state(socketinfo)) $sock
}
# Wait for the connection to complete.
if {$state(-timeout) > 0} {
fileevent $sock writable [list http::Connect $token]
http::wait $token
if {![info exists state]} {
# If we timed out then Finish has been called and the users
# command callback may have cleaned up the token. If so we end up
# here with nothing left to do.
return $token
} elseif {$state(status) eq "error"} {
# Something went wrong while trying to establish the connection.
# Clean up after events and such, but DON'T call the command
# callback (if available) because we're going to throw an
# exception from here instead.
set err [lindex $state(error) 0]
cleanup $token
return -code error $err
} elseif {$state(status) ne "connect"} {
# Likely to be connection timeout
return $token
}
set state(status) ""
}
# Send data in cr-lf format, but accept any line terminators
fconfigure $sock -translation {auto crlf} -buffersize $state(-blocksize)
# The following is disallowed in safe interpreters, but the socket is
# already in non-blocking mode in that case.
catch {fconfigure $sock -blocking off}
set how GET
if {$isQuery} {
set state(querylength) [string length $state(-query)]
if {$state(querylength) > 0} {
set how POST
set contDone 0
} else {
# There's no query data.
unset state(-query)
set isQuery 0
}
} elseif {$state(-validate)} {
set how HEAD
} elseif {$isQueryChannel} {
set how POST
# The query channel must be blocking for the async Write to
# work properly.
fconfigure $state(-querychannel) -blocking 1 -translation binary
set contDone 0
}
if {[info exists state(-method)] && $state(-method) ne ""} {
set how $state(-method)
}
if {[catch {
puts $sock "$how $srvurl HTTP/$state(-protocol)"
puts $sock "Accept: $http(-accept)"
array set hdrs $state(-headers)
if {[info exists hdrs(Host)]} {
# Allow Host spoofing. [Bug 928154]
puts $sock "Host: $hdrs(Host)"
} elseif {$port == $defport} {
# Don't add port in this case, to handle broken servers. [Bug
# #504508]
puts $sock "Host: $host"
} else {
puts $sock "Host: $host:$port"
}
unset hdrs
puts $sock "User-Agent: $http(-useragent)"
if {$state(-protocol) == 1.0 && $state(-keepalive)} {
puts $sock "Connection: keep-alive"
}
if {$state(-protocol) > 1.0 && !$state(-keepalive)} {
puts $sock "Connection: close" ;# RFC2616 sec 8.1.2.1
}
if {[info exists phost] && ($phost ne "") && $state(-keepalive)} {
puts $sock "Proxy-Connection: Keep-Alive"
}
set accept_encoding_seen 0
set content_type_seen 0
foreach {key value} $state(-headers) {
if {[string equal -nocase $key "host"]} {
continue
}
if {[string equal -nocase $key "accept-encoding"]} {
set accept_encoding_seen 1
}
if {[string equal -nocase $key "content-type"]} {
set content_type_seen 1
}
set value [string map [list \n "" \r ""] $value]
set key [string trim $key]
if {[string equal -nocase $key "content-length"]} {
set contDone 1
set state(querylength) $value
}
if {[string length $key]} {
puts $sock "$key: $value"
}
}
# Soft zlib dependency check - no package require
if {
!$accept_encoding_seen &&
([package vsatisfies [package provide Tcl] 8.6]
|| [llength [package provide zlib]]) &&
!([info exists state(-channel)] || [info exists state(-handler)])
} then {
puts $sock "Accept-Encoding: gzip, identity, *;q=0.1"
}
if {$isQueryChannel && $state(querylength) == 0} {
# Try to determine size of data in channel. If we cannot seek, the
# surrounding catch will trap us
set start [tell $state(-querychannel)]
seek $state(-querychannel) 0 end
set state(querylength) \
[expr {[tell $state(-querychannel)] - $start}]
seek $state(-querychannel) $start
}
# Flush the request header and set up the fileevent that will either
# push the POST data or read the response.
#
# fileevent note:
#
# It is possible to have both the read and write fileevents active at
# this point. The only scenario it seems to affect is a server that
# closes the connection without reading the POST data. (e.g., early
# versions TclHttpd in various error cases). Depending on the
# platform, the client may or may not be able to get the response from
# the server because of the error it will get trying to write the post
# data. Having both fileevents active changes the timing and the
# behavior, but no two platforms (among Solaris, Linux, and NT) behave
# the same, and none behave all that well in any case. Servers should
# always read their POST data if they expect the client to read their
# response.
if {$isQuery || $isQueryChannel} {
if {!$content_type_seen} {
puts $sock "Content-Type: $state(-type)"
}
if {!$contDone} {
puts $sock "Content-Length: $state(querylength)"
}
puts $sock ""
fconfigure $sock -translation {auto binary}
fileevent $sock writable [list http::Write $token]
} else {
puts $sock ""
flush $sock
fileevent $sock readable [list http::Event $sock $token]
}
if {![info exists state(-command)]} {
# geturl does EVERYTHING asynchronously, so if the user calls it
# synchronously, we just do a wait here.
wait $token
if {$state(status) eq "error"} {
# Something went wrong, so throw the exception, and the
# enclosing catch will do cleanup.
return -code error [lindex $state(error) 0]
}
}
} err]} then {
# The socket probably was never connected, or the connection dropped
# later.
# Clean up after events and such, but DON'T call the command callback
# (if available) because we're going to throw an exception from here
# instead.
# if state(status) is error, it means someone's already called Finish
# to do the above-described clean up.
if {$state(status) ne "error"} {
Finish $token $err 1
}
cleanup $token
return -code error $err
}
return $token
}
# Data access functions:
# Data - the URL data
# Status - the transaction status: ok, reset, eof, timeout
# Code - the HTTP transaction code, e.g., 200
# Size - the size of the URL data
proc http::data {token} {
variable $token
upvar 0 $token state
return $state(body)
}
proc http::status {token} {
if {![info exists $token]} {
return "error"
}
variable $token
upvar 0 $token state
return $state(status)
}
proc http::code {token} {
variable $token
upvar 0 $token state
return $state(http)
}
proc http::ncode {token} {
variable $token
upvar 0 $token state
if {[regexp {[0-9]{3}} $state(http) numeric_code]} {
return $numeric_code
} else {
return $state(http)
}
}
proc http::size {token} {
variable $token
upvar 0 $token state
return $state(currentsize)
}
proc http::meta {token} {
variable $token
upvar 0 $token state
return $state(meta)
}
proc http::error {token} {
variable $token
upvar 0 $token state
if {[info exists state(error)]} {
return $state(error)
}
return ""
}
# http::cleanup
#
# Garbage collect the state associated with a transaction
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# unsets the state array
proc http::cleanup {token} {
variable $token
upvar 0 $token state
if {[info exists state]} {
unset state
}
}
# http::Connect
#
# This callback is made when an asyncronous connection completes.
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# Sets the status of the connection, which unblocks
# the waiting geturl call
proc http::Connect {token} {
variable $token
upvar 0 $token state
set err "due to unexpected EOF"
if {
[eof $state(sock)] ||
[set err [fconfigure $state(sock) -error]] ne ""
} then {
Finish $token "connect failed $err" 1
} else {
set state(status) connect
fileevent $state(sock) writable {}
}
return
}
# http::Write
#
# Write POST query data to the socket
#
# Arguments
# token The token for the connection
#
# Side Effects
# Write the socket and handle callbacks.
proc http::Write {token} {
variable $token
upvar 0 $token state
set sock $state(sock)
# Output a block. Tcl will buffer this if the socket blocks
set done 0
if {[catch {
# Catch I/O errors on dead sockets
if {[info exists state(-query)]} {
# Chop up large query strings so queryprogress callback can give
# smooth feedback.
puts -nonewline $sock \
[string range $state(-query) $state(queryoffset) \
[expr {$state(queryoffset) + $state(-queryblocksize) - 1}]]
incr state(queryoffset) $state(-queryblocksize)
if {$state(queryoffset) >= $state(querylength)} {
set state(queryoffset) $state(querylength)
set done 1
}
} else {
# Copy blocks from the query channel
set outStr [read $state(-querychannel) $state(-queryblocksize)]
puts -nonewline $sock $outStr
incr state(queryoffset) [string length $outStr]
if {[eof $state(-querychannel)]} {
set done 1
}
}
} err]} then {
# Do not call Finish here, but instead let the read half of the socket
# process whatever server reply there is to get.
set state(posterror) $err
set done 1
}
if {$done} {
catch {flush $sock}
fileevent $sock writable {}
fileevent $sock readable [list http::Event $sock $token]
}
# Callback to the client after we've completely handled everything.
if {[string length $state(-queryprogress)]} {
eval $state(-queryprogress) \
[list $token $state(querylength) $state(queryoffset)]
}
}
# http::Event
#
# Handle input on the socket
#
# Arguments
# sock The socket receiving input.
# token The token returned from http::geturl
#
# Side Effects
# Read the socket and handle callbacks.
proc http::Event {sock token} {
variable $token
upvar 0 $token state
if {![info exists state]} {
Log "Event $sock with invalid token '$token' - remote close?"
if {![eof $sock]} {
if {[set d [read $sock]] ne ""} {
Log "WARNING: additional data left on closed socket"
}
}
CloseSocket $sock
return
}
if {$state(state) eq "connecting"} {
if {[catch {gets $sock state(http)} n]} {
return [Finish $token $n]
} elseif {$n >= 0} {
set state(state) "header"
}
} elseif {$state(state) eq "header"} {
if {[catch {gets $sock line} n]} {
return [Finish $token $n]
} elseif {$n == 0} {
# We have now read all headers
# We ignore HTTP/1.1 100 Continue returns. RFC2616 sec 8.2.3
if {$state(http) == "" || [lindex $state(http) 1] == 100} {
return
}
set state(state) body
# If doing a HEAD, then we won't get any body
if {$state(-validate)} {
Eof $token
return
}
# For non-chunked transfer we may have no body - in this case we
# may get no further file event if the connection doesn't close
# and no more data is sent. We can tell and must finish up now -
# not later.
if {
!(([info exists state(connection)]
&& ($state(connection) eq "close"))
|| [info exists state(transfer)])
&& ($state(totalsize) == 0)
} then {
Log "body size is 0 and no events likely - complete."
Eof $token
return
}
# We have to use binary translation to count bytes properly.
fconfigure $sock -translation binary
if {
$state(-binary) || ![string match -nocase text* $state(type)]
} then {
# Turn off conversions for non-text data
set state(binary) 1
}
if {
$state(binary) || [string match *gzip* $state(coding)] ||
[string match *compress* $state(coding)]
} then {
if {[info exists state(-channel)]} {
fconfigure $state(-channel) -translation binary
}
}
if {
[info exists state(-channel)] &&
![info exists state(-handler)]
} then {
# Initiate a sequence of background fcopies
fileevent $sock readable {}
CopyStart $sock $token
return
}
} elseif {$n > 0} {
# Process header lines
if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} {
switch -- [string tolower $key] {
content-type {
set state(type) [string trim [string tolower $value]]
# grab the optional charset information
if {[regexp -nocase \
{charset\s*=\s*\"((?:[^""]|\\\")*)\"} \
$state(type) -> cs]} {
set state(charset) [string map {{\"} \"} $cs]
} else {
regexp -nocase {charset\s*=\s*(\S+?);?} \
$state(type) -> state(charset)
}
}
content-length {
set state(totalsize) [string trim $value]
}
content-encoding {
set state(coding) [string trim $value]
}
transfer-encoding {
set state(transfer) \
[string trim [string tolower $value]]
}
proxy-connection -
connection {
set state(connection) \
[string trim [string tolower $value]]
}
}
lappend state(meta) $key [string trim $value]
}
}
} else {
# Now reading body
if {[catch {
if {[info exists state(-handler)]} {
set n [eval $state(-handler) [list $sock $token]]
} elseif {[info exists state(transfer_final)]} {
set line [getTextLine $sock]
set n [string length $line]
if {$n > 0} {
Log "found $n bytes following final chunk"
append state(transfer_final) $line
} else {
Log "final chunk part"
Eof $token
}
} elseif {
[info exists state(transfer)]
&& $state(transfer) eq "chunked"
} then {
set size 0
set chunk [getTextLine $sock]
set n [string length $chunk]
if {[string trim $chunk] ne ""} {
scan $chunk %x size
if {$size != 0} {
set bl [fconfigure $sock -blocking]
fconfigure $sock -blocking 1
set chunk [read $sock $size]
fconfigure $sock -blocking $bl
set n [string length $chunk]
if {$n >= 0} {
append state(body) $chunk
}
if {$size != [string length $chunk]} {
Log "WARNING: mis-sized chunk:\
was [string length $chunk], should be $size"
}
getTextLine $sock
} else {
set state(transfer_final) {}
}
}
} else {
#Log "read non-chunk $state(currentsize) of $state(totalsize)"
set block [read $sock $state(-blocksize)]
set n [string length $block]
if {$n >= 0} {
append state(body) $block
}
}
if {[info exists state]} {
if {$n >= 0} {
incr state(currentsize) $n
}
# If Content-Length - check for end of data.
if {
($state(totalsize) > 0)
&& ($state(currentsize) >= $state(totalsize))
} then {
Eof $token
}
}
} err]} then {
return [Finish $token $err]
} else {
if {[info exists state(-progress)]} {
eval $state(-progress) \
[list $token $state(totalsize) $state(currentsize)]
}
}
}
# catch as an Eof above may have closed the socket already
if {![catch {eof $sock} eof] && $eof} {
if {[info exists $token]} {
set state(connection) close
Eof $token
} else {
# open connection closed on a token that has been cleaned up.
CloseSocket $sock
}
return
}
}
# http::getTextLine --
#
# Get one line with the stream in blocking crlf mode
#
# Arguments
# sock The socket receiving input.
#
# Results:
# The line of text, without trailing newline
proc http::getTextLine {sock} {
set tr [fconfigure $sock -translation]
set bl [fconfigure $sock -blocking]
fconfigure $sock -translation crlf -blocking 1
set r [gets $sock]
fconfigure $sock -translation $tr -blocking $bl
return $r
}
# http::CopyStart
#
# Error handling wrapper around fcopy
#
# Arguments
# sock The socket to copy from
# token The token returned from http::geturl
#
# Side Effects
# This closes the connection upon error
proc http::CopyStart {sock token} {
variable $token
upvar 0 $token state
if {[catch {
fcopy $sock $state(-channel) -size $state(-blocksize) -command \
[list http::CopyDone $token]
} err]} then {
Finish $token $err
}
}
# http::CopyDone
#
# fcopy completion callback
#
# Arguments
# token The token returned from http::geturl
# count The amount transfered
#
# Side Effects
# Invokes callbacks
proc http::CopyDone {token count {error {}}} {
variable $token
upvar 0 $token state
set sock $state(sock)
incr state(currentsize) $count
if {[info exists state(-progress)]} {
eval $state(-progress) \
[list $token $state(totalsize) $state(currentsize)]
}
# At this point the token may have been reset
if {[string length $error]} {
Finish $token $error
} elseif {[catch {eof $sock} iseof] || $iseof} {
Eof $token
} else {
CopyStart $sock $token
}
}
# http::Eof
#
# Handle eof on the socket
#
# Arguments
# token The token returned from http::geturl
#
# Side Effects
# Clean up the socket
proc http::Eof {token {force 0}} {
variable $token
upvar 0 $token state
if {$state(state) eq "header"} {
# Premature eof
set state(status) eof
} else {
set state(status) ok
}
if {($state(coding) eq "gzip") && [string length $state(body)] > 0} {
if {[catch {
if {[package vsatisfies [package present Tcl] 8.6]} {
# The zlib integration into 8.6 includes proper gzip support
set state(body) [zlib gunzip $state(body)]
} else {
set state(body) [Gunzip $state(body)]
}
} err]} then {
return [Finish $token $err]
}
}
if {!$state(binary)} {
# If we are getting text, set the incoming channel's encoding
# correctly. iso8859-1 is the RFC default, but this could be any IANA
# charset. However, we only know how to convert what we have
# encodings for.
set enc [CharsetToEncoding $state(charset)]
if {$enc ne "binary"} {
set state(body) [encoding convertfrom $enc $state(body)]
}
# Translate text line endings.
set state(body) [string map {\r\n \n \r \n} $state(body)]
}
Finish $token
}
# http::wait --
#
# See documentation for details.
#
# Arguments:
# token Connection token.
#
# Results:
# The status after the wait.
proc http::wait {token} {
variable $token
upvar 0 $token state
if {![info exists state(status)] || $state(status) eq ""} {
# We must wait on the original variable name, not the upvar alias
vwait ${token}(status)
}
return [status $token]
}
# http::formatQuery --
#
# See documentation for details. Call http::formatQuery with an even
# number of arguments, where the first is a name, the second is a value,
# the third is another name, and so on.
#
# Arguments:
# args A list of name-value pairs.
#
# Results:
# TODO
proc http::formatQuery {args} {
set result ""
set sep ""
foreach i $args {
append result $sep [mapReply $i]
if {$sep eq "="} {
set sep &
} else {
set sep =
}
}
return $result
}
# http::mapReply --
#
# Do x-www-urlencoded character mapping
#
# Arguments:
# string The string the needs to be encoded
#
# Results:
# The encoded string
proc http::mapReply {string} {
variable http
variable formMap
# The spec says: "non-alphanumeric characters are replaced by '%HH'". Use
# a pre-computed map and [string map] to do the conversion (much faster
# than [regsub]/[subst]). [Bug 1020491]
if {$http(-urlencoding) ne ""} {
set string [encoding convertto $http(-urlencoding) $string]
return [string map $formMap $string]
}
set converted [string map $formMap $string]
if {[string match "*\[\u0100-\uffff\]*" $converted]} {
regexp {[\u0100-\uffff]} $converted badChar
# Return this error message for maximum compatability... :^/
return -code error \
"can't read \"formMap($badChar)\": no such element in array"
}
return $converted
}
# http::ProxyRequired --
# Default proxy filter.
#
# Arguments:
# host The destination host
#
# Results:
# The current proxy settings
proc http::ProxyRequired {host} {
variable http
if {[info exists http(-proxyhost)] && [string length $http(-proxyhost)]} {
if {
![info exists http(-proxyport)] ||
![string length $http(-proxyport)]
} then {
set http(-proxyport) 8080
}
return [list $http(-proxyhost) $http(-proxyport)]
}
}
# http::CharsetToEncoding --
#
# Tries to map a given IANA charset to a tcl encoding. If no encoding
# can be found, returns binary.
#
proc http::CharsetToEncoding {charset} {
variable encodings
set charset [string tolower $charset]
if {[regexp {iso-?8859-([0-9]+)} $charset -> num]} {
set encoding "iso8859-$num"
} elseif {[regexp {iso-?2022-(jp|kr)} $charset -> ext]} {
set encoding "iso2022-$ext"
} elseif {[regexp {shift[-_]?js} $charset]} {
set encoding "shiftjis"
} elseif {[regexp {(?:windows|cp)-?([0-9]+)} $charset -> num]} {
set encoding "cp$num"
} elseif {$charset eq "us-ascii"} {
set encoding "ascii"
} elseif {[regexp {(?:iso-?)?lat(?:in)?-?([0-9]+)} $charset -> num]} {
switch -- $num {
5 {set encoding "iso8859-9"}
1 - 2 - 3 {
set encoding "iso8859-$num"
}
}
} else {
# other charset, like euc-xx, utf-8,... may directly map to encoding
set encoding $charset
}
set idx [lsearch -exact $encodings $encoding]
if {$idx >= 0} {
return $encoding
} else {
return "binary"
}
}
# http::Gunzip --
#
# Decompress data transmitted using the gzip transfer coding.
#
# FIX ME: redo using zlib sinflate
proc http::Gunzip {data} {
binary scan $data Scb5icc magic method flags time xfl os
set pos 10
if {$magic != 0x1f8b} {
return -code error "invalid data: supplied data is not in gzip format"
}
if {$method != 8} {
return -code error "invalid compression method"
}
# lassign [split $flags ""] f_text f_crc f_extra f_name f_comment
foreach {f_text f_crc f_extra f_name f_comment} [split $flags ""] break
set extra ""
if {$f_extra} {
binary scan $data @${pos}S xlen
incr pos 2
set extra [string range $data $pos $xlen]
set pos [incr xlen]
}
set name ""
if {$f_name} {
set ndx [string first \0 $data $pos]
set name [string range $data $pos $ndx]
set pos [incr ndx]
}
set comment ""
if {$f_comment} {
set ndx [string first \0 $data $pos]
set comment [string range $data $pos $ndx]
set pos [incr ndx]
}
set fcrc ""
if {$f_crc} {
set fcrc [string range $data $pos [incr pos]]
incr pos
}
binary scan [string range $data end-7 end] ii crc size
set inflated [zlib inflate [string range $data $pos end-8]]
set chk [zlib crc32 $inflated]
if {($crc & 0xffffffff) != ($chk & 0xffffffff)} {
return -code error "invalid data: checksum mismatch $crc != $chk"
}
return $inflated
}
# Local variables:
# indent-tabs-mode: t
# End: