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/* wptGPGMEData.cpp - WinPT specifc data extensions |
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* Copyright (C) 2001-2006 Timo Schulz |
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* |
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* This file is part of WinPT. |
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* |
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* WinPT is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* WinPT is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with WinPT; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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|
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#include <windows.h> |
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#include <malloc.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <gpgme.h> |
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|
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#include "wptUtil.h" |
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#include "wptGPG.h" |
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#include "wptTypes.h" |
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|
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/* Default buffer size */ |
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#define BUFSIZE 128 |
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|
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|
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/* Implement a word based line break. @inp is the input buffer |
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and @wraplen is the maximal line length. |
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Return value: the wrapped buffer on success. */ |
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char* |
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wrap_lines (char *inp, size_t inlen, size_t wraplen, size_t *r_len) |
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{ |
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char *out; |
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char *p, *inp_ptr; |
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int end_is_le=0, add_le=0; |
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size_t n; |
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|
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inp[inlen] = 0; |
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if (inlen > 2 && inp[inlen-2] == '\r' && inp[inlen-1] == '\n') |
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end_is_le = 1; |
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out = (char *)calloc (1, 4*inlen/3+2+1); |
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if (!out) |
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return NULL; |
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n = 0; |
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inp_ptr = inp; |
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while ((p = strsep (&inp_ptr, " \n"))) { |
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if (strlen (p) == 0) { |
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strcat (out, " "); |
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n++; |
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continue; |
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} |
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/* if we find an existing \r\n pair, we generate a break |
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at the given position and reset the counter. */ |
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if (p[strlen (p)-1] == '\r') { |
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p[strlen (p)-1]=0; |
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add_le=1; |
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} |
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else |
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add_le=0; |
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if (n + strlen (p) > wraplen) { |
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strcat (out, "\r\n"); |
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n = 0; |
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} |
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else if (n > 0 || add_le) { |
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strcat (out, " "); |
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n++; |
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} |
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|
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n += strlen (p); |
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strcat (out, p); |
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if (add_le) { |
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strcat (out, "\r\n"); |
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n = 0; |
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} |
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} |
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if (end_is_le) |
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strcat (out, "\r\n"); |
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*r_len = strlen (out); |
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return out; |
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} |
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|
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|
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/* Wrap the lines of @r_dh with a line length of @wraplen. |
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@r_dh will be released and on success it contains the |
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handle to the wrapped data. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_data_wrap_lines (gpgme_data_t *r_dh, size_t wraplen) |
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{ |
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gpgme_error_t err; |
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gpgme_data_t mdh; |
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char *raw = NULL; |
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char *p = NULL; |
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size_t nlen; |
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|
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err = gpgme_data_new (&mdh); |
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if (err) |
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return err; |
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|
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raw = gpgme_data_release_and_get_mem (*r_dh, &nlen); |
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if (!raw) { |
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gpgme_data_release (mdh); |
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return gpg_error (GPG_ERR_INV_ARG); |
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} |
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|
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p = wrap_lines (raw, nlen, wraplen, &nlen); |
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if (p) { |
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gpgme_data_write (mdh, p, nlen); |
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gpgme_data_rewind (mdh); |
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free (p); |
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} |
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gpgme_free (raw); |
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*r_dh = mdh; |
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return 0; |
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} |
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|
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|
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/* Prepend '> ' to each line into @r_dh. On success @r_dh |
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contains a handle to the quoted data. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_data_mail_quote (gpgme_data_t *r_dh) |
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{ |
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gpgme_data_t dh; |
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char buf[BUFSIZE+1]; |
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|
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if (!*r_dh) |
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return gpg_error (GPG_ERR_INV_ARG); |
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gpgme_data_new (&dh); |
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while (gpg_data_readline (*r_dh, buf, DIM (buf)-1)) { |
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gpgme_data_write (dh, "> ", 2); |
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gpgme_data_write (dh, buf, strlen (buf)); |
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} |
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gpgme_data_release (*r_dh); |
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*r_dh = dh; |
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return 0; |
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} |
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|
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|
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static int |
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is_armor_header (const char *line) |
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{ |
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const char *header[] = { |
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"Version:", |
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"Comment:", |
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"Charset:", |
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"Hash:", |
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"MessageID:", |
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NULL |
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}; |
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|
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for (size_t i=0; header[i] != NULL; i++) { |
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if (!strncmp (line, header[i], strlen (header[i]))) |
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return -1; |
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} |
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return 0; |
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} |
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|
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|
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/* Extract the plaintext data from the escaped data object @sig. |
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The plaintxt is stored in @r_plain. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_data_extract_plaintext (gpgme_data_t sig, gpgme_data_t *r_plain) |
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{ |
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gpgme_data_t plain; |
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gpgme_error_t err; |
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char line[BUFSIZE+32]; |
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int pos = 0; |
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|
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if (r_plain) |
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*r_plain = NULL; |
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err = gpgme_data_new (&plain); |
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if (err) |
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return err; |
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|
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while (gpg_data_readline (sig, line, BUFSIZE) > 0) { |
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if (!strncmp (line, "-----BEGIN PGP SIGNED MESSAGE", 29) || |
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is_armor_header (line)) |
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continue; |
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if (strlen (line) <= 2) |
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break; /* parsed all headers, now we reached the body */ |
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} |
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|
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/* We just support 1 nesting level. */ |
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while (gpg_data_readline (sig, line, BUFSIZE) > 0 ) { |
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if (!strncmp (line, "-----BEGIN PGP SIGNATURE", 24)) |
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break; /* end of plaintext */ |
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if (!strncmp (line, "- -", 3)) |
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pos = 2; |
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gpgme_data_write (plain, line+pos, strlen (line+pos)); |
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pos = 0; |
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} |
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gpgme_data_write (plain, "", 1); |
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if (r_plain) |
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*r_plain = plain; |
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else |
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gpgme_data_release (plain); |
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return err; |
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} |
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|
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|
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/* Release the data in @dh and store the contents in the file @fname. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_data_release_and_set_file (gpgme_data_t dh, const char *fname) |
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{ |
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FILE *fp = fopen (fname, "wb"); |
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if (fp == NULL) |
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return gpg_error (GPG_ERR_ENOENT); |
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|
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size_t n; |
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char *p = gpgme_data_release_and_get_mem (dh, &n); |
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if (p != NULL) { |
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fwrite (p, 1, n, fp); |
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fflush (fp); |
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wipememory (p, n); |
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gpgme_free (p); |
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} |
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fclose (fp); |
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return 0; |
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} |
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|
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|
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/* Try to read a line, terminated by \n from the given |
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gpgme data object @dh into @line. |
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Return value: numbers of chars read. */ |
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size_t |
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gpg_data_readline (gpgme_data_t dh, char *line, size_t maxbytes) |
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{ |
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char ch = 0; |
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int nread = 0, pos = 0; |
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|
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if (!dh) |
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return 0; |
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|
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memset (line, 0, maxbytes); |
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while ((nread=gpgme_data_read (dh, &ch, 1)) > 0) { |
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if (!nread) |
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break; |
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if (ch == '\n') { |
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line[pos++] = ch; |
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line[pos++] = '\0'; |
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break; |
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} |
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line[pos++] = ch; |
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if (pos > (int)maxbytes-1) { |
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line[pos] = '\0'; |
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break; |
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} |
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} |
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|
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return pos; |
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} |
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|
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|
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|
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/* Write a single byte to data object @hd. */ |
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void |
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gpg_data_putc (gpgme_data_t hd, int c) |
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{ |
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BYTE ch[2]; |
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|
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ch[0] = (BYTE)c; |
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ch[1] = '\0'; |
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gpgme_data_write (hd, ch, 1); |
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} |
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