trunk/Src/wptGPGMEData.cpp

#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;
    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	twoaday	121	#include <windows.h>
2			#include <malloc.h>
3			#include <string.h>
4			#include <stdio.h>
5			#include <gpgme.h>
6
7			#include "wptUtil.h"
8			#include "wptGPG.h"
9
10			/* Implement a word based line break. @inp is the input buffer
11			and @wraplen is the maximal line length.
12			Return value: the wrapped buffer on success. */
13			char*
14			wrap_lines (char inp, size_t inlen, size_t wraplen, size_t r_len)
15			{
16			char *out;
17			char p, inp_ptr;
18			int end_is_le=0, add_le=0;
19			size_t n;
20
21			inp[inlen] = 0;
22			if (inp[inlen-2] == '\r' && inp[inlen-1] == '\n')
23			end_is_le = 1;
24			out = (char )calloc (1, 4inlen/3+2+1);
25			if (!out)
26			return NULL;
27			n = 0;
28			inp_ptr = inp;
29			while ((p = strsep (&inp_ptr, " \n"))) {
30			if (strlen (p) == 0) {
31			strcat (out, " ");
32			n++;
33			continue;
34			}
35			/* if we find an existing \r\n pair, we generate a break
36			at the given position and reset the counter. */
37			if (p[strlen (p)-1] == '\r') {
38			p[strlen (p)-1]=0;
39			add_le=1;
40			}
41			else
42			add_le=0;
43			if (n + strlen (p) > wraplen) {
44			strcat (out, "\r\n");
45			n = 0;
46			}
47			else if (n > 0 \|\| add_le) {
48			strcat (out, " ");
49			n++;
50			}
51
52			n += strlen (p);
53			strcat (out, p);
54			if (add_le) {
55			strcat (out, "\r\n");
56			n = 0;
57			}
58			}
59			if (end_is_le)
60			strcat (out, "\r\n");
61			*r_len = strlen (out);
62			return out;
63			}
64
65
66			/* Wrap the lines of @r_dh with a line length of @wraplen.
67			@r_dh will be released and on success it contains the
68			handle to the wrapped data.
69			Return value: 0 on success. */
70			gpgme_error_t
71			gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen)
72			{
73			gpgme_error_t err;
74			gpgme_data_t mdh;
75			char *raw = NULL;
76			char *p = NULL;
77			size_t nlen;
78
79			err = gpgme_data_new (&mdh);
80			if (err)
81			return err;
82
83			raw = gpgme_data_release_and_get_mem (*r_dh, &nlen);
84			if (!raw) {
85			gpgme_data_release (mdh);
86			return gpg_error (GPG_ERR_INV_ARG);
87			}
88
89			p = wrap_lines (raw, nlen, wraplen, &nlen);
90			if (p) {
91			gpgme_data_write (mdh, p, nlen);
92			gpgme_data_rewind (mdh);
93			free (p);
94			}
95			gpgme_free (raw);
96			*r_dh = mdh;
97			return 0;
98			}
99
100
101			/* Prepend '> ' to each line into @r_dh. On success @r_dh
102			contains a handle to the quoted data.
103			Return value: 0 on success. */
104			gpgme_error_t
105			gpg_data_mail_quote (gpgme_data_t *r_dh)
106			{
107			gpgme_data_t dh;
108			char buf[128];
109
110			if (!*r_dh)
111			return gpg_error (GPG_ERR_INV_ARG);
112			gpgme_data_new (&dh);
113			while (gpg_data_readline (*r_dh, buf, 127)) {
114			gpgme_data_write (dh, "> ", 2);
115			gpgme_data_write (dh, buf, strlen (buf));
116			}
117			gpgme_data_release (*r_dh);
118			*r_dh = dh;
119			return 0;
120			}
121
122
123			/* Extract the plaintext data from the escaped data object @sig.
124			The plaintxt is stored in @r_plain.
125			Return value: 0 on success. */
126			gpgme_error_t
127			gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain)
128			{
129			gpgme_data_t plain;
130			gpgme_error_t err;
131			char line[128+32];
132			int pos = 0;
133			int sig_begin = 0;
134
135			if (r_plain)
136			*r_plain = NULL;
137			err = gpgme_data_new (&plain);
138			if (err)
139			return err;
140
141			while (gpg_data_readline (sig, line, 128) > 0) {
142			if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) \|\|
143			!strncmp (line, "Version:", 8) \|\|
144			!strncmp (line, "Comment:", 8) \|\|
145			!strncmp (line, "Charset:", 8) \|\|
146			!strncmp (line, "Hash:", 5) \|\|
147			!strncmp (line, "MessageID", 9))
148			continue;
149			if (strlen (line) <= 2)
150			break; /* parsed all headers, now we reached the body */
151			}
152			/* XXX handle multi dash escaped sequences */
153			while (gpg_data_readline (sig, line, 128) > 0 ) {
154			if (!strncmp( line, "-----BEGIN PGP SIGNATURE", 24))
155			break; /* end of plaintext */
156			if (!strncmp (line, "- -", 3))
157			pos = 2;
158			gpgme_data_write (plain, line+pos, strlen (line+pos));
159			pos = 0;
160			}
161			gpgme_data_write (plain, "", 1);
162			if (r_plain)
163			*r_plain = plain;
164			else
165			gpgme_data_release (plain);
166			return err;
167			}
168
169
170			/* Release the data in @dh and store the contents in the file @fname.
171			Return value: 0 on success. */
172			gpgme_error_t
173			gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname)
174			{
175			char *p = NULL;
176			FILE *fp;
177			size_t n;
178
179			fp = fopen (fname, "wb");
180			if (fp == NULL)
181			return gpg_error (GPG_ERR_ENOENT);
182
183			p = gpgme_data_release_and_get_mem (dh, &n);
184			if (p) {
185			fwrite (p, 1, n, fp);
186			fflush (fp);
187			memset (p, 0xFF, n);
188			gpgme_free (p);
189			}
190			fclose (fp);
191			return 0;
192			}
193
194
195			/* Try to read a line, terminated by \n from the given
196			gpgme data object @dh into @line.
197			Return value: numbers of chars read. */
198			size_t
199			gpg_data_readline (gpgme_data_t dh, char *line, size_t nbytes)
200			{
201			char ch = 0;
202			int nread = 0, pos = 0;
203
204			if (!dh)
205			return 0;
206
207			memset (line, 0, nbytes);
208			while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) {
209			if (!nread)
210			break;
211			if (ch == '\n') {
212			line[pos++] = ch;
213			line[pos++] = '\0';
214			break;
215			}
216			line[pos++] = ch;
217			if (pos > (int)nbytes) {
218			line[pos++] = '\0';
219			break;
220			}
221			}
222
223			return pos;
224			}