trunk/Src/wptGPGMEData.cpp

/* wptGPGMEData.cpp - WinPT specifc data extensions
 *      Copyright (C) 2001-2006 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"
#include "wptTypes.h"

/* Default buffer size */
#define BUFSIZE 128


/* 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[BUFSIZE+1];

    if (!*r_dh)
        return gpg_error (GPG_ERR_INV_ARG);
    gpgme_data_new (&dh);
    while (gpg_data_readline (*r_dh, buf, DIM (buf)-1)) {
        gpgme_data_write (dh, "> ", 2);
        gpgme_data_write (dh, buf, strlen (buf));
    }
    gpgme_data_release (*r_dh);
    *r_dh = dh;
    return 0;
}


static int
is_armor_header (const char *line)
{
    const char *header[] = {
        "Version:",
        "Comment:",
        "Charset:",
        "Hash:",
        "MessageID",
        NULL
    };
    int i;

    for (i=0; header[i] != NULL; i++) {
        if (!strncmp (line, header[i], strlen (header[i])))
            return -1;
    }
    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[BUFSIZE+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, BUFSIZE) > 0) {
        if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) ||
            is_armor_header (line))
            continue;
        if (strlen (line) <= 2)
            break; /* parsed all headers, now we reached the body */
    }

    /* We just support 1 nesting level. */
    while (gpg_data_readline (sig, line, BUFSIZE) > 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	twoaday	200	* Copyright (C) 2001-2006 Timo Schulz
3	twoaday	133	*
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	twoaday	271	#include "wptTypes.h"
33	twoaday	121
34	twoaday	271	/* Default buffer size */
35			#define BUFSIZE 128
36	twoaday	200
37	twoaday	271
38	twoaday	121	/* Implement a word based line break. @inp is the input buffer
39			and @wraplen is the maximal line length.
40			Return value: the wrapped buffer on success. */
41			char*
42			wrap_lines (char inp, size_t inlen, size_t wraplen, size_t r_len)
43			{
44			char *out;
45			char p, inp_ptr;
46			int end_is_le=0, add_le=0;
47			size_t n;
48
49			inp[inlen] = 0;
50			if (inp[inlen-2] == '\r' && inp[inlen-1] == '\n')
51			end_is_le = 1;
52			out = (char )calloc (1, 4inlen/3+2+1);
53			if (!out)
54			return NULL;
55			n = 0;
56			inp_ptr = inp;
57			while ((p = strsep (&inp_ptr, " \n"))) {
58			if (strlen (p) == 0) {
59			strcat (out, " ");
60			n++;
61			continue;
62			}
63			/* if we find an existing \r\n pair, we generate a break
64			at the given position and reset the counter. */
65			if (p[strlen (p)-1] == '\r') {
66			p[strlen (p)-1]=0;
67			add_le=1;
68			}
69			else
70			add_le=0;
71			if (n + strlen (p) > wraplen) {
72			strcat (out, "\r\n");
73			n = 0;
74			}
75			else if (n > 0 \|\| add_le) {
76			strcat (out, " ");
77			n++;
78			}
79
80			n += strlen (p);
81			strcat (out, p);
82			if (add_le) {
83			strcat (out, "\r\n");
84			n = 0;
85			}
86			}
87			if (end_is_le)
88			strcat (out, "\r\n");
89			*r_len = strlen (out);
90			return out;
91			}
92
93
94			/* Wrap the lines of @r_dh with a line length of @wraplen.
95			@r_dh will be released and on success it contains the
96			handle to the wrapped data.
97			Return value: 0 on success. */
98			gpgme_error_t
99			gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen)
100			{
101			gpgme_error_t err;
102			gpgme_data_t mdh;
103			char *raw = NULL;
104			char *p = NULL;
105			size_t nlen;
106
107			err = gpgme_data_new (&mdh);
108			if (err)
109			return err;
110
111			raw = gpgme_data_release_and_get_mem (*r_dh, &nlen);
112			if (!raw) {
113			gpgme_data_release (mdh);
114			return gpg_error (GPG_ERR_INV_ARG);
115			}
116
117			p = wrap_lines (raw, nlen, wraplen, &nlen);
118			if (p) {
119			gpgme_data_write (mdh, p, nlen);
120			gpgme_data_rewind (mdh);
121			free (p);
122			}
123			gpgme_free (raw);
124			*r_dh = mdh;
125			return 0;
126			}
127
128
129			/* Prepend '> ' to each line into @r_dh. On success @r_dh
130			contains a handle to the quoted data.
131			Return value: 0 on success. */
132			gpgme_error_t
133			gpg_data_mail_quote (gpgme_data_t *r_dh)
134			{
135			gpgme_data_t dh;
136	twoaday	271	char buf[BUFSIZE+1];
137	twoaday	121
138			if (!*r_dh)
139			return gpg_error (GPG_ERR_INV_ARG);
140			gpgme_data_new (&dh);
141	twoaday	271	while (gpg_data_readline (*r_dh, buf, DIM (buf)-1)) {
142	twoaday	121	gpgme_data_write (dh, "> ", 2);
143			gpgme_data_write (dh, buf, strlen (buf));
144			}
145			gpgme_data_release (*r_dh);
146			*r_dh = dh;
147			return 0;
148			}
149
150
151	twoaday	200	static int
152			is_armor_header (const char *line)
153			{
154			const char *header[] = {
155			"Version:",
156			"Comment:",
157			"Charset:",
158			"Hash:",
159			"MessageID",
160			NULL
161			};
162			int i;
163
164			for (i=0; header[i] != NULL; i++) {
165			if (!strncmp (line, header[i], strlen (header[i])))
166			return -1;
167			}
168			return 0;
169			}
170
171
172	twoaday	121	/* Extract the plaintext data from the escaped data object @sig.
173			The plaintxt is stored in @r_plain.
174			Return value: 0 on success. */
175			gpgme_error_t
176			gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain)
177			{
178			gpgme_data_t plain;
179			gpgme_error_t err;
180	twoaday	271	char line[BUFSIZE+32];
181	twoaday	121	int pos = 0;
182
183			if (r_plain)
184			*r_plain = NULL;
185			err = gpgme_data_new (&plain);
186			if (err)
187			return err;
188
189	twoaday	271	while (gpg_data_readline (sig, line, BUFSIZE) > 0) {
190	twoaday	121	if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) \|\|
191	twoaday	200	is_armor_header (line))
192	twoaday	121	continue;
193			if (strlen (line) <= 2)
194			break; /* parsed all headers, now we reached the body */
195			}
196	twoaday	200
197			/* We just support 1 nesting level. */
198	twoaday	271	while (gpg_data_readline (sig, line, BUFSIZE) > 0 ) {
199	twoaday	247	if (!strncmp (line, "-----BEGIN PGP SIGNATURE", 24))
200	twoaday	121	break; /* end of plaintext */
201			if (!strncmp (line, "- -", 3))
202			pos = 2;
203			gpgme_data_write (plain, line+pos, strlen (line+pos));
204			pos = 0;
205			}
206			gpgme_data_write (plain, "", 1);
207			if (r_plain)
208			*r_plain = plain;
209			else
210			gpgme_data_release (plain);
211			return err;
212			}
213
214
215			/* Release the data in @dh and store the contents in the file @fname.
216			Return value: 0 on success. */
217			gpgme_error_t
218			gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname)
219			{
220			char *p = NULL;
221			FILE *fp;
222			size_t n;
223
224			fp = fopen (fname, "wb");
225			if (fp == NULL)
226			return gpg_error (GPG_ERR_ENOENT);
227
228			p = gpgme_data_release_and_get_mem (dh, &n);
229			if (p) {
230			fwrite (p, 1, n, fp);
231			fflush (fp);
232			memset (p, 0xFF, n);
233			gpgme_free (p);
234			}
235			fclose (fp);
236			return 0;
237			}
238
239
240			/* Try to read a line, terminated by \n from the given
241			gpgme data object @dh into @line.
242			Return value: numbers of chars read. */
243			size_t
244			gpg_data_readline (gpgme_data_t dh, char *line, size_t nbytes)
245			{
246			char ch = 0;
247			int nread = 0, pos = 0;
248
249			if (!dh)
250			return 0;
251
252			memset (line, 0, nbytes);
253			while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) {
254			if (!nread)
255			break;
256			if (ch == '\n') {
257			line[pos++] = ch;
258			line[pos++] = '\0';
259			break;
260			}
261			line[pos++] = ch;
262			if (pos > (int)nbytes) {
263			line[pos++] = '\0';
264			break;
265			}
266			}
267
268			return pos;
269			}
270	twoaday	144
271
272	twoaday	226
273	twoaday	144	/* Write a single byte to data object @hd. */
274			void
275			gpg_data_putc (gpgme_data_t hd, int c)
276			{
277	twoaday	162	BYTE ch[2];
278	twoaday	144
279			ch[0] = (BYTE)c;
280			ch[1] = '\0';
281			gpgme_data_write (hd, ch, 1);
282			}