/usr/share/tcltk/tcllib1.17/transfer/dsource.tcl is in tcllib 1.17-dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | # -*- tcl -*-
# ### ### ### ######### ######### #########
##
# Class for the handling of stream sources.
# ### ### ### ######### ######### #########
## Requirements
package require transfer::copy ; # Data transmission core
package require snit
# ### ### ### ######### ######### #########
## Implementation
snit::type ::transfer::data::source {
# ### ### ### ######### ######### #########
## API
# Source is ...
option -string -default {} -configuremethod C-str ; # a string.
option -channel -default {} -configuremethod C-chan ; # an open & readable channel.
option -file -default {} -configuremethod C-file ; # a file.
option -variable -default {} -configuremethod C-var ; # a string held by the named variable.
option -size -default -1 ; # number of characters to transfer.
option -progress -default {}
method type {} {}
method data {} {}
method size {} {}
method valid {mv} {}
method transmit {sock blocksize done} {}
# ### ### ### ######### ######### #########
## Implementation
method type {} {
return $myxtype
}
method data {} {
switch -exact -- $myetype {
undefined {
return -code error "Data source is undefined"
}
string - chan {
return $mysrc
}
variable {
upvar \#0 $mysrc thevalue
return $thevalue
}
file {
return [open $mysrc r]
}
}
}
method size {} {
if {$options(-size) < 0} {
switch -exact -- $myetype {
undefined {
return -code error "Data source is undefined"
}
string {
return [string length $mysrc]
}
variable {
upvar \#0 $mysrc thevalue
return [string length $thevalue]
}
chan - file {
# Nothing, -1 passes through
# We do not use [file size] for a file, as a
# user-specified encoding may distort the
# counting.
}
}
}
return $options(-size)
}
method valid {mv} {
upvar 1 $mv message
switch -exact -- $myetype {
undefined {
set message "Data source is undefined"
return 0
}
string - variable {
if {[$self size] > [string length [$self data]]} {
set message "Not enough data to transmit"
return 0
}
}
chan {
# Additional check of option ?
}
file {
# Additional check of option ?
}
}
return 1
}
method transmit {sock blocksize done} {
::transfer::copy::do \
[$self type] [$self data] $sock \
-size [$self size] \
-blocksize $blocksize \
-command $done \
-progress $options(-progress)
return
}
# ### ### ### ######### ######### #########
## Internal helper commands.
method C-str {o newvalue} {
set myetype string
set myxtype string
set mysrc $newvalue
return
}
method C-var {o newvalue} {
set myetype variable
set myxtype string
if {![uplevel \#0 {info exists $newvalue}]} {
return -code error "Bad variable \"$newvalue\", does not exist"
}
set mysrc $newvalue
return
}
method C-chan {o newvalue} {
if {![llength [file channels $newvalue]]} {
return -code error "Bad channel handle \"$newvalue\", does not exist"
}
set myetype chan
set myxtype chan
set mysrc $newvalue
return
}
method C-file {o newvalue} {
if {![file exists $newvalue]} {
return -code error "File \"$newvalue\" does not exist"
}
if {![file readable $newvalue]} {
return -code error "File \"$newvalue\" not readable"
}
if {![file isfile $newvalue]} {
return -code error "File \"$newvalue\" not a file"
}
set myetype file
set myxtype chan
set mysrc $newvalue
return
}
# ### ### ### ######### ######### #########
## Data structures
variable myetype undefined
variable myxtype undefined
variable mysrc
##
# ### ### ### ######### ######### #########
}
# ### ### ### ######### ######### #########
## Ready
package provide transfer::data::source 0.2
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