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"


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