/usr/share/tcltk/tcllib1.19/base64/uuencode.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 | # uuencode - Copyright (C) 2002 Pat Thoyts <patthoyts@users.sourceforge.net>
#
# Provide a Tcl only implementation of uuencode and uudecode.
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
package require Tcl 8.2; # tcl minimum version
# Try and get some compiled helper package.
if {[catch {package require tcllibc}]} {
catch {package require Trf}
}
namespace eval ::uuencode {
namespace export encode decode uuencode uudecode
}
proc ::uuencode::Enc {c} {
return [format %c [expr {($c != 0) ? (($c & 0x3f) + 0x20) : 0x60}]]
}
proc ::uuencode::Encode {s} {
set r {}
binary scan $s c* d
foreach {c1 c2 c3} $d {
if {$c1 == {}} {set c1 0}
if {$c2 == {}} {set c2 0}
if {$c3 == {}} {set c3 0}
append r [Enc [expr {$c1 >> 2}]]
append r [Enc [expr {(($c1 << 4) & 060) | (($c2 >> 4) & 017)}]]
append r [Enc [expr {(($c2 << 2) & 074) | (($c3 >> 6) & 003)}]]
append r [Enc [expr {($c3 & 077)}]]
}
return $r
}
proc ::uuencode::Decode {s} {
if {[string length $s] == 0} {return ""}
set r {}
binary scan [pad $s] c* d
foreach {c0 c1 c2 c3} $d {
append r [format %c [expr {((($c0-0x20)&0x3F) << 2) & 0xFF
| ((($c1-0x20)&0x3F) >> 4) & 0xFF}]]
append r [format %c [expr {((($c1-0x20)&0x3F) << 4) & 0xFF
| ((($c2-0x20)&0x3F) >> 2) & 0xFF}]]
append r [format %c [expr {((($c2-0x20)&0x3F) << 6) & 0xFF
| (($c3-0x20)&0x3F) & 0xFF}]]
}
return $r
}
# -------------------------------------------------------------------------
# C coded version of the Encode/Decode functions for base64c package.
# -------------------------------------------------------------------------
if {[package provide critcl] != {}} {
namespace eval ::uuencode {
critcl::ccode {
#include <string.h>
static unsigned char Enc(unsigned char c) {
return (c != 0) ? ((c & 0x3f) + 0x20) : 0x60;
}
}
critcl::ccommand CEncode {dummy interp objc objv} {
Tcl_Obj *inputPtr, *resultPtr;
int len, rlen, xtra;
unsigned char *input, *p, *r;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "data");
return TCL_ERROR;
}
inputPtr = objv[1];
input = Tcl_GetByteArrayFromObj(inputPtr, &len);
if ((xtra = (3 - (len % 3))) != 3) {
if (Tcl_IsShared(inputPtr))
inputPtr = Tcl_DuplicateObj(inputPtr);
input = Tcl_SetByteArrayLength(inputPtr, len + xtra);
memset(input + len, 0, xtra);
len += xtra;
}
rlen = (len / 3) * 4;
resultPtr = Tcl_NewObj();
r = Tcl_SetByteArrayLength(resultPtr, rlen);
memset(r, 0, rlen);
for (p = input; p < input + len; p += 3) {
char a, b, c;
a = *p; b = *(p+1), c = *(p+2);
*r++ = Enc(a >> 2);
*r++ = Enc(((a << 4) & 060) | ((b >> 4) & 017));
*r++ = Enc(((b << 2) & 074) | ((c >> 6) & 003));
*r++ = Enc(c & 077);
}
Tcl_SetObjResult(interp, resultPtr);
return TCL_OK;
}
critcl::ccommand CDecode {dummy interp objc objv} {
Tcl_Obj *inputPtr, *resultPtr;
int len, rlen, xtra;
unsigned char *input, *p, *r;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "data");
return TCL_ERROR;
}
/* if input is not mod 4, extend it with nuls */
inputPtr = objv[1];
input = Tcl_GetByteArrayFromObj(inputPtr, &len);
if ((xtra = (4 - (len % 4))) != 4) {
if (Tcl_IsShared(inputPtr))
inputPtr = Tcl_DuplicateObj(inputPtr);
input = Tcl_SetByteArrayLength(inputPtr, len + xtra);
memset(input + len, 0, xtra);
len += xtra;
}
/* output will be 1/3 smaller than input and a multiple of 3 */
rlen = (len / 4) * 3;
resultPtr = Tcl_NewObj();
r = Tcl_SetByteArrayLength(resultPtr, rlen);
memset(r, 0, rlen);
for (p = input; p < input + len; p += 4) {
char a, b, c, d;
a = *p; b = *(p+1), c = *(p+2), d = *(p+3);
*r++ = (((a - 0x20) & 0x3f) << 2) | (((b - 0x20) & 0x3f) >> 4);
*r++ = (((b - 0x20) & 0x3f) << 4) | (((c - 0x20) & 0x3f) >> 2);
*r++ = (((c - 0x20) & 0x3f) << 6) | (((d - 0x20) & 0x3f) );
}
Tcl_SetObjResult(interp, resultPtr);
return TCL_OK;
}
}
}
# -------------------------------------------------------------------------
# Description:
# Permit more tolerant decoding of invalid input strings by padding to
# a multiple of 4 bytes with nulls.
# Result:
# Returns the input string - possibly padded with uuencoded null chars.
#
proc ::uuencode::pad {s} {
if {[set mod [expr {[string length $s] % 4}]] != 0} {
append s [string repeat "`" [expr {4 - $mod}]]
}
return $s
}
# -------------------------------------------------------------------------
# If the Trf package is available then we shall use this by default but the
# Tcllib implementations are always visible if needed (ie: for testing)
if {[info commands ::uuencode::CDecode] != {}} {
# tcllib critcl package
interp alias {} ::uuencode::encode {} ::uuencode::CEncode
interp alias {} ::uuencode::decode {} ::uuencode::CDecode
} elseif {[package provide Trf] != {}} {
proc ::uuencode::encode {s} {
return [::uuencode -mode encode -- $s]
}
proc ::uuencode::decode {s} {
return [::uuencode -mode decode -- [pad $s]]
}
} else {
# pure-tcl then
interp alias {} ::uuencode::encode {} ::uuencode::Encode
interp alias {} ::uuencode::decode {} ::uuencode::Decode
}
# -------------------------------------------------------------------------
proc ::uuencode::uuencode {args} {
array set opts {mode 0644 filename {} name {}}
set wrongargs "wrong \# args: should be\
\"uuencode ?-name string? ?-mode octal?\
(-file filename | ?--? string)\""
while {[string match -* [lindex $args 0]]} {
switch -glob -- [lindex $args 0] {
-f* {
if {[llength $args] < 2} {
return -code error $wrongargs
}
set opts(filename) [lindex $args 1]
set args [lreplace $args 0 0]
}
-m* {
if {[llength $args] < 2} {
return -code error $wrongargs
}
set opts(mode) [lindex $args 1]
set args [lreplace $args 0 0]
}
-n* {
if {[llength $args] < 2} {
return -code error $wrongargs
}
set opts(name) [lindex $args 1]
set args [lreplace $args 0 0]
}
-- {
set args [lreplace $args 0 0]
break
}
default {
return -code error "bad option [lindex $args 0]:\
must be -file, -mode, or -name"
}
}
set args [lreplace $args 0 0]
}
if {$opts(name) == {}} {
set opts(name) $opts(filename)
}
if {$opts(name) == {}} {
set opts(name) "data.dat"
}
if {$opts(filename) != {}} {
set f [open $opts(filename) r]
fconfigure $f -translation binary
set data [read $f]
close $f
} else {
if {[llength $args] != 1} {
return -code error $wrongargs
}
set data [lindex $args 0]
}
set r {}
append r [format "begin %o %s" $opts(mode) $opts(name)] "\n"
for {set n 0} {$n < [string length $data]} {incr n 45} {
set s [string range $data $n [expr {$n + 44}]]
append r [Enc [string length $s]]
append r [encode $s] "\n"
}
append r "`\nend"
return $r
}
# -------------------------------------------------------------------------
# Description:
# Perform uudecoding of a file or data. A file may contain more than one
# encoded data section so the result is a list where each element is a
# three element list of the provided filename, the suggested mode and the
# data itself.
#
proc ::uuencode::uudecode {args} {
array set opts {mode 0644 filename {}}
set wrongargs "wrong \# args: should be \"uudecode (-file filename | ?--? string)\""
while {[string match -* [lindex $args 0]]} {
switch -glob -- [lindex $args 0] {
-f* {
if {[llength $args] < 2} {
return -code error $wrongargs
}
set opts(filename) [lindex $args 1]
set args [lreplace $args 0 0]
}
-- {
set args [lreplace $args 0 0]
break
}
default {
return -code error "bad option [lindex $args 0]:\
must be -file"
}
}
set args [lreplace $args 0 0]
}
if {$opts(filename) != {}} {
set f [open $opts(filename) r]
set data [read $f]
close $f
} else {
if {[llength $args] != 1} {
return -code error $wrongargs
}
set data [lindex $args 0]
}
set state false
set result {}
foreach {line} [split $data "\n"] {
switch -exact -- $state {
false {
if {[regexp {^begin ([0-7]+) ([^\s]*)} $line \
-> opts(mode) opts(name)]} {
set state true
set r {}
}
}
true {
if {[string match "end" $line]} {
set state false
lappend result [list $opts(name) $opts(mode) $r]
} else {
scan $line %c c
set n [expr {($c - 0x21)}]
append r [string range \
[decode [string range $line 1 end]] 0 $n]
}
}
}
}
return $result
}
# -------------------------------------------------------------------------
package provide uuencode 1.1.5
# -------------------------------------------------------------------------
#
# Local variables:
# mode: tcl
# indent-tabs-mode: nil
# End:
|