trunk/Src/wptGPGMEData.cpp

/* wptGPGMEData.cpp - WinPT specifc data extensions
 *      Copyright (C) 2001-2005 Timo Schulz
 *
 * This file is part of WinPT.
 *
 * WinPT is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation; either version 2 
 * of the License, or (at your option) any later version.
 *  
 * WinPT is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with WinPT; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <windows.h>
#include <malloc.h>
#include <string.h>
#include <stdio.h>
#include <gpgme.h>

#include "wptUtil.h"
#include "wptGPG.h"

/* Implement a word based line break. @inp is the input buffer
   and @wraplen is the maximal line length.
   Return value: the wrapped buffer on success. */
char*
wrap_lines (char *inp, size_t inlen, size_t wraplen, size_t *r_len)
{
    char *out;
    char *p, *inp_ptr;
    int end_is_le=0, add_le=0;
    size_t n;

    inp[inlen] = 0;
    if (inp[inlen-2] == '\r' && inp[inlen-1] == '\n')
        end_is_le = 1;
    out = (char *)calloc (1, 4*inlen/3+2+1);
    if (!out)
        return NULL;
    n = 0;
    inp_ptr = inp;
    while ((p = strsep (&inp_ptr, " \n"))) {
        if (strlen (p) == 0) {
            strcat (out, " ");
            n++;
            continue;
        }
        /* if we find an existing \r\n pair, we generate a break
           at the given position and reset the counter. */
        if (p[strlen (p)-1] == '\r') {
            p[strlen (p)-1]=0;
            add_le=1;
        }
        else
            add_le=0;
        if (n + strlen (p) > wraplen) {
            strcat (out, "\r\n");
            n = 0;
        }
        else if (n > 0 || add_le) {
            strcat (out, " ");
            n++;
        }

        n += strlen (p);
        strcat (out, p);
        if (add_le) {
            strcat (out, "\r\n");
            n = 0;
        }
    }
    if (end_is_le)
        strcat (out, "\r\n");
    *r_len = strlen (out);
    return out;
}


/* Wrap the lines of @r_dh with a line length of @wraplen.
   @r_dh will be released and on success it contains the
   handle to the wrapped data.
   Return value: 0 on success. */
gpgme_error_t
gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen)
{       
    gpgme_error_t err;
    gpgme_data_t mdh;
    char *raw = NULL;
    char *p = NULL;
    size_t nlen;
    
    err = gpgme_data_new (&mdh);
    if (err)
        return err;

    raw = gpgme_data_release_and_get_mem (*r_dh, &nlen);
    if (!raw) {
        gpgme_data_release (mdh);
        return gpg_error (GPG_ERR_INV_ARG);
    }
        
    p = wrap_lines (raw, nlen, wraplen, &nlen);
    if (p) {    
        gpgme_data_write (mdh, p, nlen);    
        gpgme_data_rewind (mdh);    
        free (p);
    }
    gpgme_free (raw);
    *r_dh = mdh;
    return 0;
}


/* Prepend '> ' to each line into @r_dh. On success @r_dh
   contains a handle to the quoted data. 
   Return value: 0 on success. */
gpgme_error_t
gpg_data_mail_quote (gpgme_data_t *r_dh)
{
    gpgme_data_t dh;
    char buf[128];

    if (!*r_dh)
        return gpg_error (GPG_ERR_INV_ARG);
    gpgme_data_new (&dh);
    while (gpg_data_readline (*r_dh, buf, 127)) {
        gpgme_data_write (dh, "> ", 2);
        gpgme_data_write (dh, buf, strlen (buf));
    }
    gpgme_data_release (*r_dh);
    *r_dh = dh;
    return 0;
}


/* Extract the plaintext data from the escaped data object @sig.
   The plaintxt is stored in @r_plain.
   Return value: 0 on success. */
gpgme_error_t
gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain)
{
    gpgme_data_t plain;
    gpgme_error_t err;
    char line[128+32];
    int pos = 0;
    
    if (r_plain)
        *r_plain = NULL;
    err = gpgme_data_new (&plain);
    if (err)
        return err;
    
    while (gpg_data_readline (sig, line, 128) > 0) {
        if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) ||
            !strncmp (line, "Version:", 8) ||
            !strncmp (line, "Comment:", 8) ||
            !strncmp (line, "Charset:", 8) ||
            !strncmp (line, "Hash:", 5) ||
            !strncmp (line, "MessageID", 9))
            continue;
        if (strlen (line) <= 2)
            break; /* parsed all headers, now we reached the body */
    }
    /* XXX handle multi dash escaped sequences */
    while (gpg_data_readline (sig, line, 128) > 0 ) {
        if (!strncmp( line, "-----BEGIN PGP SIGNATURE", 24))
            break; /* end of plaintext */
        if (!strncmp (line, "- -", 3))
            pos = 2;
        gpgme_data_write (plain, line+pos, strlen (line+pos));
        pos = 0;
    }
    gpgme_data_write (plain, "", 1);
    if (r_plain)
        *r_plain = plain;
    else
        gpgme_data_release (plain);
    return err;
}


/* Release the data in @dh and store the contents in the file @fname.
   Return value: 0 on success. */
gpgme_error_t
gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname)
{
    char *p = NULL;
    FILE *fp;
    size_t n;
    
    fp = fopen (fname, "wb");
    if (fp == NULL)
        return gpg_error (GPG_ERR_ENOENT);
    
    p = gpgme_data_release_and_get_mem (dh, &n);
    if (p) {
        fwrite (p, 1, n, fp);
        fflush (fp);
        memset (p, 0xFF, n);
        gpgme_free (p);
    }
    fclose (fp);
    return 0;
}


/* Try to read a line, terminated by \n from the given
   gpgme data object @dh into @line. 
   Return value: numbers of chars read. */
size_t
gpg_data_readline (gpgme_data_t dh, char *line, size_t nbytes)
{
    char ch = 0;
    int nread = 0, pos = 0;

    if (!dh)
        return 0;
    
    memset (line, 0, nbytes);
    while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) {
        if (!nread)
            break;
        if (ch == '\n') {
            line[pos++] = ch;
            line[pos++] = '\0';
            break;
        }
        line[pos++] = ch;
        if (pos > (int)nbytes) {
            line[pos++] = '\0';
            break;
        }
    }
    
    return pos;
}


/* Write a single byte to data object @hd. */
void
gpg_data_putc (gpgme_data_t hd, int c)
{
    BYTE ch[2];

    ch[0] = (BYTE)c;
    ch[1] = '\0';
    gpgme_data_write (hd, ch, 1);
}
1	twoaday	133	/* wptGPGMEData.cpp - WinPT specifc data extensions
2			* Copyright (C) 2001-2005 Timo Schulz
3			*
4			* This file is part of WinPT.
5			*
6			* WinPT is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* WinPT is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with WinPT; if not, write to the Free Software Foundation,
18			* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20			#ifdef HAVE_CONFIG_H
21			#include <config.h>
22			#endif
23
24	twoaday	121	#include <windows.h>
25			#include <malloc.h>
26			#include <string.h>
27			#include <stdio.h>
28			#include <gpgme.h>
29
30			#include "wptUtil.h"
31			#include "wptGPG.h"
32
33			/* Implement a word based line break. @inp is the input buffer
34			and @wraplen is the maximal line length.
35			Return value: the wrapped buffer on success. */
36			char*
37			wrap_lines (char inp, size_t inlen, size_t wraplen, size_t r_len)
38			{
39			char *out;
40			char p, inp_ptr;
41			int end_is_le=0, add_le=0;
42			size_t n;
43
44			inp[inlen] = 0;
45			if (inp[inlen-2] == '\r' && inp[inlen-1] == '\n')
46			end_is_le = 1;
47			out = (char )calloc (1, 4inlen/3+2+1);
48			if (!out)
49			return NULL;
50			n = 0;
51			inp_ptr = inp;
52			while ((p = strsep (&inp_ptr, " \n"))) {
53			if (strlen (p) == 0) {
54			strcat (out, " ");
55			n++;
56			continue;
57			}
58			/* if we find an existing \r\n pair, we generate a break
59			at the given position and reset the counter. */
60			if (p[strlen (p)-1] == '\r') {
61			p[strlen (p)-1]=0;
62			add_le=1;
63			}
64			else
65			add_le=0;
66			if (n + strlen (p) > wraplen) {
67			strcat (out, "\r\n");
68			n = 0;
69			}
70			else if (n > 0 \|\| add_le) {
71			strcat (out, " ");
72			n++;
73			}
74
75			n += strlen (p);
76			strcat (out, p);
77			if (add_le) {
78			strcat (out, "\r\n");
79			n = 0;
80			}
81			}
82			if (end_is_le)
83			strcat (out, "\r\n");
84			*r_len = strlen (out);
85			return out;
86			}
87
88
89			/* Wrap the lines of @r_dh with a line length of @wraplen.
90			@r_dh will be released and on success it contains the
91			handle to the wrapped data.
92			Return value: 0 on success. */
93			gpgme_error_t
94			gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen)
95			{
96			gpgme_error_t err;
97			gpgme_data_t mdh;
98			char *raw = NULL;
99			char *p = NULL;
100			size_t nlen;
101
102			err = gpgme_data_new (&mdh);
103			if (err)
104			return err;
105
106			raw = gpgme_data_release_and_get_mem (*r_dh, &nlen);
107			if (!raw) {
108			gpgme_data_release (mdh);
109			return gpg_error (GPG_ERR_INV_ARG);
110			}
111
112			p = wrap_lines (raw, nlen, wraplen, &nlen);
113			if (p) {
114			gpgme_data_write (mdh, p, nlen);
115			gpgme_data_rewind (mdh);
116			free (p);
117			}
118			gpgme_free (raw);
119			*r_dh = mdh;
120			return 0;
121			}
122
123
124			/* Prepend '> ' to each line into @r_dh. On success @r_dh
125			contains a handle to the quoted data.
126			Return value: 0 on success. */
127			gpgme_error_t
128			gpg_data_mail_quote (gpgme_data_t *r_dh)
129			{
130			gpgme_data_t dh;
131			char buf[128];
132
133			if (!*r_dh)
134			return gpg_error (GPG_ERR_INV_ARG);
135			gpgme_data_new (&dh);
136			while (gpg_data_readline (*r_dh, buf, 127)) {
137			gpgme_data_write (dh, "> ", 2);
138			gpgme_data_write (dh, buf, strlen (buf));
139			}
140			gpgme_data_release (*r_dh);
141			*r_dh = dh;
142			return 0;
143			}
144
145
146			/* Extract the plaintext data from the escaped data object @sig.
147			The plaintxt is stored in @r_plain.
148			Return value: 0 on success. */
149			gpgme_error_t
150			gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain)
151			{
152			gpgme_data_t plain;
153			gpgme_error_t err;
154			char line[128+32];
155			int pos = 0;
156
157			if (r_plain)
158			*r_plain = NULL;
159			err = gpgme_data_new (&plain);
160			if (err)
161			return err;
162
163			while (gpg_data_readline (sig, line, 128) > 0) {
164			if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) \|\|
165			!strncmp (line, "Version:", 8) \|\|
166			!strncmp (line, "Comment:", 8) \|\|
167			!strncmp (line, "Charset:", 8) \|\|
168			!strncmp (line, "Hash:", 5) \|\|
169			!strncmp (line, "MessageID", 9))
170			continue;
171			if (strlen (line) <= 2)
172			break; /* parsed all headers, now we reached the body */
173			}
174			/* XXX handle multi dash escaped sequences */
175			while (gpg_data_readline (sig, line, 128) > 0 ) {
176			if (!strncmp( line, "-----BEGIN PGP SIGNATURE", 24))
177			break; /* end of plaintext */
178			if (!strncmp (line, "- -", 3))
179			pos = 2;
180			gpgme_data_write (plain, line+pos, strlen (line+pos));
181			pos = 0;
182			}
183			gpgme_data_write (plain, "", 1);
184			if (r_plain)
185			*r_plain = plain;
186			else
187			gpgme_data_release (plain);
188			return err;
189			}
190
191
192			/* Release the data in @dh and store the contents in the file @fname.
193			Return value: 0 on success. */
194			gpgme_error_t
195			gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname)
196			{
197			char *p = NULL;
198			FILE *fp;
199			size_t n;
200
201			fp = fopen (fname, "wb");
202			if (fp == NULL)
203			return gpg_error (GPG_ERR_ENOENT);
204
205			p = gpgme_data_release_and_get_mem (dh, &n);
206			if (p) {
207			fwrite (p, 1, n, fp);
208			fflush (fp);
209			memset (p, 0xFF, n);
210			gpgme_free (p);
211			}
212			fclose (fp);
213			return 0;
214			}
215
216
217			/* Try to read a line, terminated by \n from the given
218			gpgme data object @dh into @line.
219			Return value: numbers of chars read. */
220			size_t
221			gpg_data_readline (gpgme_data_t dh, char *line, size_t nbytes)
222			{
223			char ch = 0;
224			int nread = 0, pos = 0;
225
226			if (!dh)
227			return 0;
228
229			memset (line, 0, nbytes);
230			while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) {
231			if (!nread)
232			break;
233			if (ch == '\n') {
234			line[pos++] = ch;
235			line[pos++] = '\0';
236			break;
237			}
238			line[pos++] = ch;
239			if (pos > (int)nbytes) {
240			line[pos++] = '\0';
241			break;
242			}
243			}
244
245			return pos;
246			}
247	twoaday	144
248
249			/* Write a single byte to data object @hd. */
250			void
251			gpg_data_putc (gpgme_data_t hd, int c)
252			{
253	twoaday	162	BYTE ch[2];
254	twoaday	144
255			ch[0] = (BYTE)c;
256			ch[1] = '\0';
257			gpgme_data_write (hd, ch, 1);
258			}