1 files changed, 149 insertions, 0 deletions
diff --git a/lang/cpp/src/callbacks.cpp b/lang/cpp/src/callbacks.cpp
new file mode 100644
index 0000000..4b4dd80
--- /dev/null
+++ b/lang/cpp/src/callbacks.cpp
@@ -0,0 +1,149 @@
+/*
+  callbacks.cpp - callback targets for internal use:
+  Copyright (C) 2003,2004 Klarälvdalens Datakonsult AB
+
+  This file is part of GPGME++.
+
+  GPGME++ is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Library General Public
+  License as published by the Free Software Foundation; either
+  version 2 of the License, or (at your option) any later version.
+
+  GPGME++ 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 Library General Public License for more details.
+
+  You should have received a copy of the GNU Library General Public License
+  along with GPGME++; see the file COPYING.LIB.  If not, write to the
+  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+*/
+
+#include "callbacks.h"
+#include "util.h"
+
+#include <interfaces/progressprovider.h>
+#include <interfaces/passphraseprovider.h>
+#include <interfaces/dataprovider.h>
+#include <error.h>
+
+#include <gpgme.h>
+#include <gpg-error.h>
+
+#include <cassert>
+#include <cerrno>
+#include <cstring>
+#include <unistd.h>
+#include <stdlib.h>
+
+static inline gpgme_error_t make_err_from_syserror()
+{
+    return gpgme_error_from_syserror();
+}
+
+using GpgME::ProgressProvider;
+using GpgME::PassphraseProvider;
+using GpgME::DataProvider;
+
+void progress_callback(void *opaque, const char *what,
+                       int type, int current, int total)
+{
+    ProgressProvider *provider = static_cast<ProgressProvider *>(opaque);
+    if (provider) {
+        provider->showProgress(what, type, current, total);
+    }
+}
+
+/* To avoid that a compiler optimizes certain memset calls away, these
+   macros may be used instead. */
+#define wipememory2(_ptr,_set,_len) do { \
+        volatile char *_vptr=(volatile char *)(_ptr); \
+        size_t _vlen=(_len); \
+        while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
+    } while(0)
+#define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
+
+gpgme_error_t passphrase_callback(void *opaque, const char *uid_hint, const char *desc,
+                                  int prev_was_bad, int fd)
+{
+    PassphraseProvider *provider = static_cast<PassphraseProvider *>(opaque);
+    bool canceled = false;
+    gpgme_error_t err = GPG_ERR_NO_ERROR;
+    char *passphrase = provider ? provider->getPassphrase(uid_hint, desc, prev_was_bad, canceled) : 0 ;
+    if (canceled) {
+        err = make_error(GPG_ERR_CANCELED);
+    } else {
+        if (passphrase && *passphrase) {
+            size_t passphrase_length = std::strlen(passphrase);
+            size_t written = 0;
+            do {
+                ssize_t now_written = gpgme_io_write(fd, passphrase + written, passphrase_length - written);
+                if (now_written < 0) {
+                    err = make_err_from_syserror();
+                    break;
+                }
+                written += now_written;
+            } while (written < passphrase_length);
+        }
+    }
+
+    if (passphrase && *passphrase) {
+        wipememory(passphrase, std::strlen(passphrase));
+    }
+    free(passphrase);
+    gpgme_io_write(fd, "\n", 1);
+    return err;
+}
+
+static gpgme_ssize_t
+data_read_callback(void *opaque, void *buf, size_t buflen)
+{
+    DataProvider *provider = static_cast<DataProvider *>(opaque);
+    if (!provider) {
+        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
+        return -1;
+    }
+    return (gpgme_ssize_t)provider->read(buf, buflen);
+}
+
+static gpgme_ssize_t
+data_write_callback(void *opaque, const void *buf, size_t buflen)
+{
+    DataProvider *provider = static_cast<DataProvider *>(opaque);
+    if (!provider) {
+        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
+        return -1;
+    }
+    return (gpgme_ssize_t)provider->write(buf, buflen);
+}
+
+static gpgme_off_t
+data_seek_callback(void *opaque, gpgme_off_t offset, int whence)
+{
+    DataProvider *provider = static_cast<DataProvider *>(opaque);
+    if (!provider) {
+        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
+        return -1;
+    }
+    if (whence != SEEK_SET && whence != SEEK_CUR && whence != SEEK_END) {
+        gpgme_err_set_errno(gpgme_err_code_to_errno(GPG_ERR_EINVAL));
+        return -1;
+    }
+    return provider->seek((off_t)offset, whence);
+}
+
+static void data_release_callback(void *opaque)
+{
+    DataProvider *provider = static_cast<DataProvider *>(opaque);
+    if (provider) {
+        provider->release();
+    }
+}
+
+const gpgme_data_cbs GpgME::data_provider_callbacks = {
+    &data_read_callback,
+    &data_write_callback,
+    &data_seek_callback,
+    &data_release_callback
+};