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# base32hexc.tcl --
#
# Implementation of a base32 (extended hex) de/encoder for Tcl.
#
# Public domain
#
# RCS: @(#) $Id: base32hex_c.tcl,v 1.3 2008/01/28 22:58:18 andreas_kupries Exp $
package require critcl
package require Tcl 8.4
namespace eval ::base32::hex {
# Supporting code for the main command.
catch {
#critcl::cheaders -g
#critcl::debug memory symbols
}
# Main commands, encoder & decoder
critcl::ccommand critcl_encode {dummy interp objc objv} {
/* Syntax -*- c -*-
* critcl_encode string
*/
unsigned char* buf;
int nbuf;
unsigned char* out;
unsigned char* at;
int nout;
/*
* The array used for encoding
*/ /* 123456789 123456789 123456789 12 */
static const char map[] = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
#define USAGEE "bitstring"
if (objc != 2) {
Tcl_WrongNumArgs (interp, 1, objv, USAGEE);
return TCL_ERROR;
}
buf = Tcl_GetByteArrayFromObj (objv[1], &nbuf);
nout = ((nbuf+4)/5)*8;
out = (unsigned char*) Tcl_Alloc (nout*sizeof(char));
for (at = out; nbuf >= 5; nbuf -= 5, buf += 5) {
*(at++) = map [ (buf[0]>>3) ];
*(at++) = map [ 0x1f & ((buf[0]<<2) | (buf[1]>>6)) ];
*(at++) = map [ 0x1f & (buf[1]>>1) ];
*(at++) = map [ 0x1f & ((buf[1]<<4) | (buf[2]>>4)) ];
*(at++) = map [ 0x1f & ((buf[2]<<1) | (buf[3]>>7)) ];
*(at++) = map [ 0x1f & (buf[3]>>2) ];
*(at++) = map [ 0x1f & ((buf[3]<<3) | (buf[4]>>5)) ];
*(at++) = map [ 0x1f & (buf[4]) ];
}
if (nbuf > 0) {
/* Process partials at end. */
switch (nbuf) {
case 1:
/* |01234567| 2, padding 6
* xxxxx
* xxx 00
*/
*(at++) = map [ (buf[0]>>3) ];
*(at++) = map [ 0x1f & (buf[0]<<2) ];
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
break;
case 2: /* x3/=4 */
/* |01234567|01234567| 4, padding 4
* xxxxx
* xxx xx
* xxxxx
* x 0000
*/
*(at++) = map [ (buf[0]>>3) ];
*(at++) = map [ 0x1f & ((buf[0]<<2) | (buf[1]>>6)) ];
*(at++) = map [ 0x1f & (buf[1]>>1) ];
*(at++) = map [ 0x1f & (buf[1]<<4) ];
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
break;
case 3:
/* |01234567|01234567|01234567| 5, padding 3
* xxxxx
* xxx xx
* xxxxx
* x xxxx
* xxxx 0
*/
*(at++) = map [ (buf[0]>>3) ];
*(at++) = map [ 0x1f & ((buf[0]<<2) | (buf[1]>>6)) ];
*(at++) = map [ 0x1f & (buf[1]>>1) ];
*(at++) = map [ 0x1f & ((buf[1]<<4) | (buf[2]>>4)) ];
*(at++) = map [ 0x1f & (buf[2]<<1) ];
*(at++) = '=';
*(at++) = '=';
*(at++) = '=';
break;
case 4:
/* |01234567|01234567|01234567|012334567| 7, padding 1
* xxxxx
* xxx xx
* xxxxx
* x xxxx
* xxxx
* xxxxx
* xxxx 0
*/
*(at++) = map [ (buf[0]>>3) ];
*(at++) = map [ 0x1f & ((buf[0]<<2) | (buf[1]>>6)) ];
*(at++) = map [ 0x1f & (buf[1]>>1) ];
*(at++) = map [ 0x1f & ((buf[1]<<4) | (buf[2]>>4)) ];
*(at++) = map [ 0x1f & ((buf[2]<<1) | (buf[3]>>7)) ];
*(at++) = map [ 0x1f & (buf[3]>>2) ];
*(at++) = map [ 0x1f & (buf[3]<<3) ];
*(at++) = '=';
break;
}
}
Tcl_SetObjResult (interp, Tcl_NewStringObj ((char*)out, nout));
Tcl_Free ((char*) out);
return TCL_OK;
}
critcl::ccommand critcl_decode {dummy interp objc objv} {
/* Syntax -*- c -*-
* critcl_decode estring
*/
unsigned char* buf;
int nbuf;
unsigned char* out;
unsigned char* at;
unsigned char x [8];
int nout;
int i, j, a, pad, nx;
/*
* An array for translating single base-32 characters into a value.
* Disallowed input characters have a value of 64. Upper and lower
* case is the same. Only 128 chars, as everything above char(127)
* is 64.
*/
static const char map [] = {
/* \00 */ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
/* DLE */ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
/* SPC */ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
/* '0' */ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 64, 64, 64, 64, 64, 64,
/* '@' */ 64, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
/* 'P' */ 25, 26, 27, 28, 29, 30, 31, 64, 64, 64, 64, 64, 64, 64, 64, 64,
/* '`' */ 64, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
/* 'p' */ 25, 26, 27, 28, 29, 30, 31, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
#define USAGED "estring"
if (objc != 2) {
Tcl_WrongNumArgs (interp, 1, objv, USAGED);
return TCL_ERROR;
}
buf = (unsigned char*) Tcl_GetStringFromObj (objv[1], &nbuf);
if (nbuf % 8) {
Tcl_SetObjResult (interp, Tcl_NewStringObj ("Length is not a multiple of 8", -1));
return TCL_ERROR;
}
nout = (nbuf/8)*5 *TCL_UTF_MAX;
out = (unsigned char*) Tcl_Alloc (nout*sizeof(char));
#define HIGH(x) (((x) & 0x80) != 0)
#define BADC(x) ((x) == 64)
#define BADCHAR(a,j) (HIGH ((a)) || BADC (x [(j)] = map [(a)]))
for (pad = 0, i=0, at = out; i < nbuf; i += 8, buf += 8){
for (j=0; j < 8; j++){
a = buf [j];
if (a == '=') {
x[j] = 0;
pad++;
continue;
} else if (pad) {
char msg [120];
sprintf (msg,
"Invalid character at index %d: \"=\" (padding found in the middle of the input)",
j-1);
Tcl_Free ((char*) out);
Tcl_SetObjResult (interp, Tcl_NewStringObj (msg, -1));
return TCL_ERROR;
}
if (BADCHAR (a,j)) {
char msg [100];
sprintf (msg,"Invalid character at index %d: \"%c\"",j,a);
Tcl_Free ((char*) out);
Tcl_SetObjResult (interp, Tcl_NewStringObj (msg, -1));
return TCL_ERROR;
}
}
*(at++) = (x[0]<<3) | (x[1]>>2) ;
*(at++) = (x[1]<<6) | (x[2]<<1) | (x[3]>>4);
*(at++) = (x[3]<<4) | (x[4]>>1) ;
*(at++) = (x[4]<<7) | (x[5]<<2) | (x[6]>>3);
*(at++) = (x[6]<<5) | x[7] ;
}
if (pad) {
if (pad == 1) {
at -= 1;
} else if (pad == 3) {
at -= 2;
} else if (pad == 4) {
at -= 3;
} else if (pad == 6) {
at -= 4;
} else {
char msg [100];
sprintf (msg,"Invalid padding of length %d",pad);
Tcl_Free ((char*) out);
Tcl_SetObjResult (interp, Tcl_NewStringObj (msg, -1));
return TCL_ERROR;
}
}
Tcl_SetObjResult (interp, Tcl_NewByteArrayObj (out, at-out));
Tcl_Free ((char*) out);
return TCL_OK;
}
}
# ### ### ### ######### ######### #########
## Ready
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