trunk/w32gpgme/data.c

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

#include "w32gpgme.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 = 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;
    int sig_begin = 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;
}
1	#include <windows.h>
2	#include <malloc.h>
3	#include <string.h>
4	#include <stdio.h>
5
6	#include "w32gpgme.h"
7
8
9	/* Implement a word based line break. @inp is the input buffer
10	and @wraplen is the maximal line length.
11	Return value: the wrapped buffer on success. */
12	char*
13	wrap_lines (char inp, size_t inlen, size_t wraplen, size_t r_len)
14	{
15	char *out;
16	char p, inp_ptr;
17	int end_is_le=0, add_le=0;
18	size_t n;
19
20	inp[inlen] = 0;
21	if (inp[inlen-2] == '\r' && inp[inlen-1] == '\n')
22	end_is_le = 1;
23	out = calloc (1, 4*inlen/3+2+1);
24	if (!out)
25	return NULL;
26	n = 0;
27	inp_ptr = inp;
28	while ((p = strsep (&inp_ptr, " \n"))) {
29	if (strlen (p) == 0) {
30	strcat (out, " ");
31	n++;
32	continue;
33	}
34	/* if we find an existing \r\n pair, we generate a break
35	at the given position and reset the counter. */
36	if (p[strlen (p)-1] == '\r') {
37	p[strlen (p)-1]=0;
38	add_le=1;
39	}
40	else
41	add_le=0;
42	if (n + strlen (p) > wraplen) {
43	strcat (out, "\r\n");
44	n = 0;
45	}
46	else if (n > 0 \|\| add_le) {
47	strcat (out, " ");
48	n++;
49	}
50
51	n += strlen (p);
52	strcat (out, p);
53	if (add_le) {
54	strcat (out, "\r\n");
55	n = 0;
56	}
57	}
58	if (end_is_le)
59	strcat (out, "\r\n");
60	*r_len = strlen (out);
61	return out;
62	}
63
64
65	/* Wrap the lines of @r_dh with a line length of @wraplen.
66	@r_dh will be released and on success it contains the
67	handle to the wrapped data.
68	Return value: 0 on success. */
69	gpgme_error_t
70	gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen)
71	{
72	gpgme_error_t err;
73	gpgme_data_t mdh;
74	char *raw = NULL;
75	char *p = NULL;
76	size_t nlen;
77
78	err = gpgme_data_new (&mdh);
79	if (err)
80	return err;
81
82	raw = gpgme_data_release_and_get_mem (*r_dh, &nlen);
83	if (!raw) {
84	gpgme_data_release (mdh);
85	return gpg_error (GPG_ERR_INV_ARG);
86	}
87
88	p = wrap_lines (raw, nlen, wraplen, &nlen);
89	if (p) {
90	gpgme_data_write (mdh, p, nlen);
91	gpgme_data_rewind (mdh);
92	free (p);
93	}
94	gpgme_free (raw);
95	*r_dh = mdh;
96	return 0;
97	}
98
99
100	/* Prepend '> ' to each line into @r_dh. On success @r_dh
101	contains a handle to the quoted data.
102	Return value: 0 on success. */
103	gpgme_error_t
104	gpg_data_mail_quote (gpgme_data_t *r_dh)
105	{
106	gpgme_data_t dh;
107	char buf[128];
108
109	if (!*r_dh)
110	return gpg_error (GPG_ERR_INV_ARG);
111	gpgme_data_new (&dh);
112	while (gpg_data_readline (*r_dh, buf, 127)) {
113	gpgme_data_write (dh, "> ", 2);
114	gpgme_data_write (dh, buf, strlen (buf));
115	}
116	gpgme_data_release (*r_dh);
117	*r_dh = dh;
118	return 0;
119	}
120
121
122	/* Extract the plaintext data from the escaped data object @sig.
123	The plaintxt is stored in @r_plain.
124	Return value: 0 on success. */
125	gpgme_error_t
126	gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain)
127	{
128	gpgme_data_t plain;
129	gpgme_error_t err;
130	char line[128+32];
131	int pos = 0;
132	int sig_begin = 0;
133
134	if (r_plain)
135	*r_plain = NULL;
136	err = gpgme_data_new (&plain);
137	if (err)
138	return err;
139
140	while (gpg_data_readline (sig, line, 128) > 0) {
141	if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) \|\|
142	!strncmp (line, "Version:", 8) \|\|
143	!strncmp (line, "Comment:", 8) \|\|
144	!strncmp (line, "Charset:", 8) \|\|
145	!strncmp (line, "Hash:", 5) \|\|
146	!strncmp (line, "MessageID", 9))
147	continue;
148	if (strlen (line) <= 2)
149	break; /* parsed all headers, now we reached the body */
150	}
151	/* XXX handle multi dash escaped sequences */
152	while (gpg_data_readline (sig, line, 128) > 0 ) {
153	if (!strncmp( line, "-----BEGIN PGP SIGNATURE", 24))
154	break; /* end of plaintext */
155	if (!strncmp (line, "- -", 3))
156	pos = 2;
157	gpgme_data_write (plain, line+pos, strlen (line+pos));
158	pos = 0;
159	}
160	gpgme_data_write (plain, "", 1);
161	if (r_plain)
162	*r_plain = plain;
163	else
164	gpgme_data_release (plain);
165	return err;
166	}
167
168
169	/* Release the data in @dh and store the contents in the file @fname.
170	Return value: 0 on success. */
171	gpgme_error_t
172	gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname)
173	{
174	char *p = NULL;
175	FILE *fp;
176	size_t n;
177
178	fp = fopen (fname, "wb");
179	if (fp == NULL)
180	return gpg_error (GPG_ERR_ENOENT);
181
182	p = gpgme_data_release_and_get_mem (dh, &n);
183	if (p) {
184	fwrite (p, 1, n, fp);
185	fflush (fp);
186	memset (p, 0xFF, n);
187	gpgme_free (p);
188	}
189	fclose (fp);
190	return 0;
191	}
192
193
194	/* Try to read a line, terminated by \n from the given
195	gpgme data object @dh into @line.
196	Return value: numbers of chars read. */
197	size_t
198	gpg_data_readline (gpgme_data_t dh, char *line, size_t nbytes)
199	{
200	char ch = 0;
201	int nread = 0, pos = 0;
202
203	if (!dh)
204	return 0;
205
206	memset (line, 0, nbytes);
207	while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) {
208	if (!nread)
209	break;
210	if (ch == '\n') {
211	line[pos++] = ch;
212	line[pos++] = '\0';
213	break;
214	}
215	line[pos++] = ch;
216	if (pos > (int)nbytes) {
217	line[pos++] = '\0';
218	break;
219	}
220	}
221
222	return pos;
223	}