trunk/Src/wptFileCBS.cpp

/* wptFileCBS.cpp - Customized I/O callbacks for GPGME
 *      Copyright (C) 2005 Timo Schulz
 *      Copyright (C) 2005 g10 Code GmbH
 *
 * 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 <stdio.h>
#include <errno.h>
#include <malloc.h>

#include "gpgme.h"
#include "wptListView.h"
#include "wptGPG.h"
#include "wptFileManager.h"
#include "wptErrors.h"
#include "wptTypes.h"

void progress_callback (void *opaque, const char *what, int type, 
                        int off, int max);


/* Predefined read callback. */
static long
read_cb (void *handle, void *buffer, size_t size)
{
    file_data_t cb = (file_data_t)handle;
    struct progress_filter_s *pfx = (struct progress_filter_s *)cb->cb_value;
    DWORD nread = 0;

    ReadFile (cb->handle, buffer, size, &nread, NULL);

    /* XXX: there is a sync problem with the progress dialog. */
    if (pfx)
        progress_callback (pfx, NULL, 0, cb->off, cb->size);
    cb->off += nread;
    return (long)nread;
}


/* Predefined write callback. */
static long
write_cb (void *handle, const void *buffer, size_t size)
{
    file_data_t cb = (file_data_t)handle;
    DWORD nwritten;

    /* XXX: check if fd == INVALID_HANDLE_VALUE. */

    if (!cb->handle) {
        SECURITY_ATTRIBUTES sec_attr;

        memset (&sec_attr, 0, sizeof (sec_attr));
        sec_attr.bInheritHandle = FALSE;
        sec_attr.nLength = sizeof (sec_attr);
        cb->handle = CreateFile (cb->name, GENERIC_WRITE, FILE_SHARE_WRITE,
                                 &sec_attr, CREATE_ALWAYS, 0, NULL);
    }

    WriteFile (cb->handle, buffer, size, &nwritten, NULL);
    return (long)nwritten;
}


/* Create a new data -> file association with a static callback.
   @fname is the file which is associated to the object.
   @r_cb is the context which holds all information.
   @for_read is 1 if the file is opened for read only.
   Return value: 0 on success. */
gpgme_error_t
gpg_file_data_new (const char *fname, int flags, file_data_t *r_cb)
                      
{
    gpgme_error_t err;
    file_data_t cb;
    HANDLE fd = NULL;
    SECURITY_ATTRIBUTES sec_attr;

    memset (&sec_attr, 0, sizeof (sec_attr));
    sec_attr.bInheritHandle = FALSE;
    sec_attr.nLength = sizeof (sec_attr);
    if (flags & F_DATA_READ) {
        fd = CreateFile (fname, GENERIC_READ, FILE_SHARE_READ,
                         &sec_attr, OPEN_EXISTING, 0, NULL);
        if (fd == INVALID_HANDLE_VALUE)
            return gpgme_err_code_from_errno (ENOENT);
    }
    cb = (file_data_t)calloc (1, sizeof *cb);
    if (!cb)
        BUG (NULL);
    cb->name = strdup (fname);
    if (!cb->name)
        BUG (NULL);
    cb->cbs.read = read_cb;
    cb->cbs.write = write_cb;
    if (flags & F_DATA_READ) {
        cb->handle = fd;
        cb->size = GetFileSize (fd, NULL);
        cb->off = 0;
    }

    err = gpgme_data_new_from_cbs  (&cb->dat, &cb->cbs, cb);
    if (err) {
        CloseHandle (fd);
        free (cb);
        return err;
    }

    *r_cb = cb;
    return err;
}


/* Activate the progress callback for the given object @ctx. */
void
gpg_file_data_set_cb (file_data_t ctx, struct progress_filter_s *pfx)
{
    ctx->cb_value = (void*)pfx;
}


/* Release the context in @cb. Close all internal handles if possible. */
void
gpg_file_data_release (file_data_t cb)
{
    if (!cb)
        return;
    if (cb->handle) {
        CloseHandle (cb->handle);
        cb->handle = NULL;
    }
    if (cb->dat)
        gpgme_data_release (cb->dat);
    safe_free (cb->name);
    safe_free (cb);
}
1	twoaday	119	/* wptFileCBS.cpp - Customized I/O callbacks for GPGME
2	werner	36	* Copyright (C) 2005 Timo Schulz
3			* Copyright (C) 2005 g10 Code GmbH
4			*
5			* This file is part of WinPT.
6			*
7			* WinPT is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU General Public License
9			* as published by the Free Software Foundation; either version 2
10			* of the License, or (at your option) any later version.
11			*
12			* WinPT is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with WinPT; if not, write to the Free Software Foundation,
19			* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21			#ifdef HAVE_CONFIG_H
22			#include <config.h>
23			#endif
24
25			#include <windows.h>
26			#include <stdio.h>
27	twoaday	119	#include <errno.h>
28	werner	36	#include <malloc.h>
29
30			#include "gpgme.h"
31			#include "wptListView.h"
32			#include "wptGPG.h"
33			#include "wptFileManager.h"
34			#include "wptErrors.h"
35			#include "wptTypes.h"
36
37	twoaday	119	void progress_callback (void opaque, const char what, int type,
38			int off, int max);
39	werner	36
40
41			/* Predefined read callback. */
42			static long
43			read_cb (void handle, void buffer, size_t size)
44			{
45			file_data_t cb = (file_data_t)handle;
46			struct progress_filter_s pfx = (struct progress_filter_s )cb->cb_value;
47	twoaday	119	DWORD nread = 0;
48	werner	36
49	twoaday	119	ReadFile (cb->handle, buffer, size, &nread, NULL);
50
51	werner	36	/* XXX: there is a sync problem with the progress dialog. */
52			if (pfx)
53			progress_callback (pfx, NULL, 0, cb->off, cb->size);
54	twoaday	119	cb->off += nread;
55			return (long)nread;
56	werner	36	}
57
58
59			/* Predefined write callback. */
60			static long
61			write_cb (void handle, const void buffer, size_t size)
62			{
63			file_data_t cb = (file_data_t)handle;
64	twoaday	119	DWORD nwritten;
65	werner	36
66	twoaday	119	/* XXX: check if fd == INVALID_HANDLE_VALUE. */
67
68			if (!cb->handle) {
69			SECURITY_ATTRIBUTES sec_attr;
70
71			memset (&sec_attr, 0, sizeof (sec_attr));
72			sec_attr.bInheritHandle = FALSE;
73			sec_attr.nLength = sizeof (sec_attr);
74			cb->handle = CreateFile (cb->name, GENERIC_WRITE, FILE_SHARE_WRITE,
75			&sec_attr, CREATE_ALWAYS, 0, NULL);
76			}
77
78			WriteFile (cb->handle, buffer, size, &nwritten, NULL);
79			return (long)nwritten;
80	werner	36	}
81
82
83			/* Create a new data -> file association with a static callback.
84			@fname is the file which is associated to the object.
85			@r_cb is the context which holds all information.
86			@for_read is 1 if the file is opened for read only.
87			Return value: 0 on success. */
88			gpgme_error_t
89	twoaday	119	gpg_file_data_new (const char fname, int flags, file_data_t r_cb)
90	werner	36
91			{
92			gpgme_error_t err;
93			file_data_t cb;
94	twoaday	119	HANDLE fd = NULL;
95			SECURITY_ATTRIBUTES sec_attr;
96	werner	36
97	twoaday	119	memset (&sec_attr, 0, sizeof (sec_attr));
98			sec_attr.bInheritHandle = FALSE;
99			sec_attr.nLength = sizeof (sec_attr);
100			if (flags & F_DATA_READ) {
101			fd = CreateFile (fname, GENERIC_READ, FILE_SHARE_READ,
102			&sec_attr, OPEN_EXISTING, 0, NULL);
103			if (fd == INVALID_HANDLE_VALUE)
104			return gpgme_err_code_from_errno (ENOENT);
105			}
106	werner	36	cb = (file_data_t)calloc (1, sizeof *cb);
107			if (!cb)
108	twoaday	119	BUG (NULL);
109			cb->name = strdup (fname);
110			if (!cb->name)
111			BUG (NULL);
112	werner	36	cb->cbs.read = read_cb;
113			cb->cbs.write = write_cb;
114	twoaday	119	if (flags & F_DATA_READ) {
115			cb->handle = fd;
116			cb->size = GetFileSize (fd, NULL);
117	werner	36	cb->off = 0;
118			}
119
120			err = gpgme_data_new_from_cbs (&cb->dat, &cb->cbs, cb);
121			if (err) {
122	twoaday	119	CloseHandle (fd);
123	werner	36	free (cb);
124			return err;
125			}
126
127			*r_cb = cb;
128			return err;
129			}
130
131
132			/* Activate the progress callback for the given object @ctx. */
133			void
134			gpg_file_data_set_cb (file_data_t ctx, struct progress_filter_s *pfx)
135			{
136			ctx->cb_value = (void*)pfx;
137			}
138
139
140			/* Release the context in @cb. Close all internal handles if possible. */
141			void
142			gpg_file_data_release (file_data_t cb)
143			{
144			if (!cb)
145			return;
146			if (cb->handle) {
147	twoaday	119	CloseHandle (cb->handle);
148			cb->handle = NULL;
149	werner	36	}
150			if (cb->dat)
151			gpgme_data_release (cb->dat);
152	twoaday	119	safe_free (cb->name);
153			safe_free (cb);
154	werner	36	}