/usr/share/tcltk/tcllib1.19/fileutil/decode.tcl is in tcllib 1.19-dfsg-2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | # -*- tcl -*-
# ### ### ### ######### ######### #########
## Copyright (c) 2008-2009 ActiveState Software Inc., Andreas Kupries
## 2016 Andreas Kupries
## BSD License
##
# Package to help the writing of file decoders. Provides generic
# low-level support commands.
package require Tcl 8.4
namespace eval ::fileutil::decode {
namespace export mark go rewind at
namespace export byte short-le long-le nbytes skip
namespace export unsigned match recode getval
namespace export clear get put putloc setbuf
}
# ### ### ### ######### ######### #########
##
proc ::fileutil::decode::open {fname} {
variable chan
set chan [::open $fname r]
fconfigure $chan \
-translation binary \
-encoding binary \
-eofchar {}
return
}
proc ::fileutil::decode::close {} {
variable chan
::close $chan
}
# ### ### ### ######### ######### #########
##
proc ::fileutil::decode::mark {} {
variable chan
variable mark
set mark [tell $chan]
return
}
proc ::fileutil::decode::go {to} {
variable chan
seek $chan $to start
return
}
proc ::fileutil::decode::rewind {} {
variable chan
variable mark
if {$mark == {}} {
return -code error \
-errorcode {FILE DECODE NO MARK} \
"No mark to rewind to"
}
seek $chan $mark start
set mark {}
return
}
proc ::fileutil::decode::at {} {
variable chan
return [tell $chan]
}
# ### ### ### ######### ######### #########
##
proc ::fileutil::decode::byte {} {
variable chan
variable mask 0xff
variable val [read $chan 1]
binary scan $val c val
return
}
proc ::fileutil::decode::short-le {} {
variable chan
variable mask 0xffff
variable val [read $chan 2]
binary scan $val s val
return
}
proc ::fileutil::decode::long-le {} {
variable chan
variable mask 0xffffffff
variable val [read $chan 4]
binary scan $val i val
return
}
proc ::fileutil::decode::nbytes {n} {
variable chan
variable mask {}
variable val [read $chan $n]
return
}
proc ::fileutil::decode::skip {n} {
variable chan
#read $chan $n
seek $chan $n current
return
}
# ### ### ### ######### ######### #########
##
proc ::fileutil::decode::unsigned {} {
variable val
if {$val >= 0} return
variable mask
if {$mask eq {}} {
return -code error \
-errorcode {FILE DECODE ILLEGAL UNSIGNED} \
"Unsigned not possible here"
}
set val [format %u [expr {$val & $mask}]]
return
}
proc ::fileutil::decode::match {eval} {
variable val
#puts "Match: Expected $eval, Got: [format 0x%08x $val]"
if {$val == $eval} {return 1}
rewind
return 0
}
proc ::fileutil::decode::recode {cmdpfx} {
variable val
lappend cmdpfx $val
set val [uplevel 1 $cmdpfx]
return
}
proc ::fileutil::decode::getval {} {
variable val
return $val
}
# ### ### ### ######### ######### #########
##
proc ::fileutil::decode::clear {} {
variable buf {}
return
}
proc ::fileutil::decode::get {} {
variable buf
return $buf
}
proc ::fileutil::decode::setbuf {list} {
variable buf $list
return
}
proc ::fileutil::decode::put {name} {
variable buf
variable val
lappend buf $name $val
return
}
proc ::fileutil::decode::putloc {name} {
variable buf
variable chan
lappend buf $name [tell $chan]
return
}
# ### ### ### ######### ######### #########
##
namespace eval ::fileutil::decode {
# Stream to read from
variable chan {}
# Last value read from the stream, or modified through decoder
# operations.
variable val {}
# Remembered location in the stream
variable mark {}
# Buffer for accumulating structured results
variable buf {}
# Mask for trimming a value to unsigned.
# Size-dependent
variable mask {}
}
# ### ### ### ######### ######### #########
## Ready
package provide fileutil::decode 0.2.1
return
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