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Add Base64 decoder. Not yet used but complements out encoder.
This commit is contained in:
Werner Koch
parent
b11af4cf50
commit
5a788b9e00
@ -1,3 +1,7 @@
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2008-06-09 Werner Koch <wk@g10code.com>
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* b64dec.c: New.
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2008-06-05 Werner Koch <wk@g10code.com>
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* util.h (gnupg_copy_time): Replace strcpy by memcpy.
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@ -50,7 +50,7 @@ common_sources = \
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homedir.c \
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gettime.c \
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yesno.c \
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b64enc.c \
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b64enc.c b64dec.c \
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convert.c \
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miscellaneous.c \
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xasprintf.c \
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217
common/b64dec.c
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217
common/b64dec.c
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@ -0,0 +1,217 @@
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/* b64dec.c - Simple Base64 decoder.
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "i18n.h"
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#include "util.h"
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/* The reverse base-64 list used for base-64 decoding. */
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static unsigned char const asctobin[128] =
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{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
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0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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enum decoder_states
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{
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s_init, s_idle, s_lfseen, s_begin,
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s_b64_0, s_b64_1, s_b64_2, s_b64_3,
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s_waitendtitle, s_waitend
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};
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/* Initialize the context for the base64 decoder. If TITLE is NULL a
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plain base64 decoding is done. If it is the empty string the
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decoder will skip everything until a "-----BEGIN " line has been
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seen, decoding ends at a "----END " line.
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Not yet implemented: If TITLE is either "PGP" or begins with "PGP "
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the PGP armor lines are skipped as well. */
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gpg_error_t
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b64dec_start (struct b64state *state, const char *title)
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{
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memset (state, 0, sizeof *state);
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if (title)
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{
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if (!strncmp (title, "PGP", 3) && (!title[3] || title[3] == ' '))
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return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
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state->title = xtrystrdup (title);
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if (!state->title)
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return gpg_error_from_syserror ();
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state->idx = s_init;
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}
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else
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state->idx = s_b64_0;
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return 0;
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}
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/* Do in-place decoding of base-64 data of LENGTH in BUFFER. Stores the
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new length of the buffer at R_NBYTES. */
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gpg_error_t
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b64dec_proc (struct b64state *state, void *buffer, size_t length,
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size_t *r_nbytes)
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{
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enum decoder_states ds = state->idx;
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unsigned char val = state->radbuf[0];
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int pos = state->quad_count;
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char *d, *s;
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if (state->stop_seen)
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{
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*r_nbytes = 0;
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return gpg_error (GPG_ERR_EOF);
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}
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for (s=d=buffer; length && !state->stop_seen; length--, s++)
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{
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switch (ds)
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{
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case s_idle:
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if (*s == '\n')
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{
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ds = s_lfseen;
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pos = 0;
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}
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break;
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case s_init:
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ds = s_lfseen;
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case s_lfseen:
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if (*s != "-----BEGIN "[pos])
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ds = s_idle;
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else if (pos == 10)
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ds = s_begin;
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else
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pos++;
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break;
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case s_begin:
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if (*s == '\n')
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ds = s_b64_0;
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break;
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case s_b64_0:
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case s_b64_1:
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case s_b64_2:
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case s_b64_3:
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{
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int c;
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if (*s == '-' && state->title)
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{
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/* Not a valid Base64 character: assume end
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header. */
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ds = s_waitend;
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}
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else if (*s == '=')
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{
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/* Pad character: stop */
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if (ds == s_b64_1)
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*d++ = val;
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ds = state->title? s_waitendtitle : s_waitend;
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}
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else if (*s == '\n' || *s == ' ' || *s == '\r' || *s == '\t')
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; /* Skip white spaces. */
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else if ( (*s & 0x80)
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|| (c = asctobin[*(unsigned char *)s]) == 255)
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{
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/* Skip invalid encodings. */
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state->invalid_encoding = 1;
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}
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else if (ds == s_b64_0)
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{
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val = c << 2;
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ds = s_b64_1;
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}
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else if (ds == s_b64_1)
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{
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val |= (c>>4)&3;
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*d++ = val;
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val = (c<<4)&0xf0;
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ds = s_b64_2;
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}
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else if (ds == s_b64_2)
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{
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val |= (c>>2)&15;
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*d++ = val;
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val = (c<<6)&0xc0;
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ds = s_b64_3;
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}
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else
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{
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val |= c&0x3f;
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*d++ = val;
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ds = s_b64_0;
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}
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}
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break;
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case s_waitendtitle:
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if (*s == '-')
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ds = s_waitend;
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break;
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case s_waitend:
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if ( *s == '\n')
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state->stop_seen = 1;
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break;
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default:
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BUG();
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}
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}
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state->idx = ds;
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state->radbuf[0] = val;
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state->quad_count = pos;
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*r_nbytes = (d -(char*) buffer);
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return 0;
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}
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/* This function needs to be called before releasing the decoder
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state. It may return an error code in case an encoding error has
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been found during decoding. */
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gpg_error_t
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b64dec_finish (struct b64state *state)
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{
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xfree (state->title);
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state->title = NULL;
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return state->invalid_encoding? gpg_error(GPG_ERR_BAD_DATA): 0;
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}
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@ -65,13 +65,92 @@ test_b64enc_pgp (const char *string)
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}
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static void
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test_b64enc_file (const char *fname)
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{
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gpg_error_t err;
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struct b64state state;
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FILE *fp;
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char buffer[50];
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size_t nread;
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fp = fname ? fopen (fname, "r") : stdin;
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if (!fp)
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{
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fprintf (stderr, "%s:%d: can't open `%s': %s\n",
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__FILE__, __LINE__, fname? fname:"[stdin]", strerror (errno));
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fail (0);
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}
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err = b64enc_start (&state, stdout, "DATA");
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if (err)
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fail (1);
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while ( (nread = fread (buffer, 1, sizeof buffer, fp)) )
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{
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err = b64enc_write (&state, buffer, nread);
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if (err)
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fail (2);
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}
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err = b64enc_finish (&state);
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if (err)
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fail (3);
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fclose (fp);
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pass ();
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}
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static void
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test_b64dec_file (const char *fname)
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{
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gpg_error_t err;
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struct b64state state;
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FILE *fp;
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char buffer[50];
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size_t nread, nbytes;
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fp = fname ? fopen (fname, "r") : stdin;
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if (!fp)
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{
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fprintf (stderr, "%s:%d: can't open `%s': %s\n",
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__FILE__, __LINE__, fname? fname:"[stdin]", strerror (errno));
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fail (0);
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}
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err = b64dec_start (&state, "");
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if (err)
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fail (1);
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while ( (nread = fread (buffer, 1, sizeof buffer, fp)) )
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{
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err = b64dec_proc (&state, buffer, nread, &nbytes);
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if (err)
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{
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if (gpg_err_code (err) == GPG_ERR_EOF)
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break;
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fail (2);
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}
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else if (nbytes)
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fwrite (buffer, 1, nbytes, stdout);
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}
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err = b64dec_finish (&state);
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if (err)
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fail (3);
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fclose (fp);
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pass ();
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}
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int
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main (int argc, char **argv)
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{
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int do_encode = 0;
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int do_decode = 0;
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if (argc)
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{ argc--; argv++; }
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if (argc && !strcmp (argv[0], "--verbose"))
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@ -80,7 +159,23 @@ main (int argc, char **argv)
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argc--; argv++;
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}
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test_b64enc_pgp (argc? *argv: NULL);
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if (argc && !strcmp (argv[0], "--encode"))
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{
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do_encode = 1;
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argc--; argv++;
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}
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else if (argc && !strcmp (argv[0], "--decode"))
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{
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do_decode = 1;
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argc--; argv++;
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}
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if (do_encode)
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test_b64enc_file (argc? *argv: NULL);
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else if (do_decode)
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test_b64dec_file (argc? *argv: NULL);
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else
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test_b64enc_pgp (argc? *argv: NULL);
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return !!errcount;
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}
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@ -149,7 +149,7 @@ ssize_t read_line (FILE *fp,
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size_t *max_length);
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/*-- b64enc.c --*/
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/*-- b64enc.c and b64dec.c --*/
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struct b64state
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{
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unsigned int flags;
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@ -159,12 +159,23 @@ struct b64state
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char *title;
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unsigned char radbuf[4];
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u32 crc;
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int stop_seen:1;
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int invalid_encoding:1;
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};
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gpg_error_t b64enc_start (struct b64state *state, FILE *fp, const char *title);
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gpg_error_t b64enc_write (struct b64state *state,
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const void *buffer, size_t nbytes);
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gpg_error_t b64enc_finish (struct b64state *state);
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gpg_error_t b64dec_start (struct b64state *state, const char *title);
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gpg_error_t b64dec_proc (struct b64state *state, void *buffer, size_t length,
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size_t *r_nbytes);
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gpg_error_t b64dec_finish (struct b64state *state);
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/*-- sexputil.c */
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gpg_error_t keygrip_from_canon_sexp (const unsigned char *key, size_t keylen,
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unsigned char *grip);
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