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/* wptFileCBS.cpp - Customized I/O callbacks for GPGME |
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* Copyright (C) 2005, 2006 Timo Schulz |
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* Copyright (C) 2005 g10 Code GmbH |
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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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#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 <stdio.h> |
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#include <errno.h> |
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|
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#include "wptCommonCtl.h" |
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#include "wptGPG.h" |
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#include "wptFileManager.h" |
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#include "wptErrors.h" |
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#include "wptTypes.h" |
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#include "wptW32API.h" |
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#include "wptUTF8.h" |
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|
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void progress_callback (void *opaque, const char *what, int type, |
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int off, int max); |
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|
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|
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/* Predefined read callback. */ |
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static ssize_t |
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read_cb (void *handle, void *buffer, size_t size) |
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{ |
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file_data_t cb = (file_data_t)handle; |
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struct progress_filter_s *pfx = (struct progress_filter_s *)cb->cb_value; |
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DWORD nread = 0; |
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|
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if (cb->error) |
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return -1; |
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|
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if (!ReadFile (cb->handle, buffer, size, &nread, NULL)) { |
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cb->error = (int)GetLastError (); |
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log_debug ("read_cb: ReadFile() error=%d\r\n", cb->error); |
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return -1; |
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} |
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|
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|
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/* UTF8 klude: Remove byte order marker */ |
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if (nread > 3 && cb->off == 0 && !memcmp(buffer, UTF8_BOM, 3)) { |
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BYTE *buf = (BYTE*)buffer; |
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memmove(buf, buf + 3, nread - 3); |
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nread -= 3; |
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} |
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|
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/* XXX: there is a sync problem with the progress dialog. */ |
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if (pfx != NULL) |
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progress_callback (pfx, NULL, 0, cb->off, cb->size); |
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cb->off += nread; |
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return (long)nread; |
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} |
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|
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|
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/* Predefined write callback. */ |
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static ssize_t |
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write_cb (void *handle, const void *buffer, size_t size) |
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{ |
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file_data_t cb = (file_data_t)handle; |
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DWORD nwritten; |
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|
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if (cb->error) |
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return -1; |
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|
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if (!cb->handle) { |
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SECURITY_ATTRIBUTES sec_attr; |
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|
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memset (&sec_attr, 0, sizeof (sec_attr)); |
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sec_attr.bInheritHandle = FALSE; |
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sec_attr.nLength = sizeof (sec_attr); |
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cb->handle = CreateFile (cb->name, GENERIC_WRITE, FILE_SHARE_WRITE, |
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&sec_attr, CREATE_ALWAYS, 0, NULL); |
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if (cb->handle == INVALID_HANDLE_VALUE) { |
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cb->error = (int)GetLastError (); |
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log_debug ("write_cb: CreateFile() error=%d\r\n", cb->error); |
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return -1; |
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} |
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} |
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|
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if (!WriteFile (cb->handle, buffer, size, &nwritten, NULL)) { |
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cb->error = (int)GetLastError (); |
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log_debug ("write_cb: WriteFile() error=%d\r\n", cb->error); |
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return -1; |
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} |
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return (long)nwritten; |
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} |
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|
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|
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/* Create a new data -> file association with a static callback. |
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@fname is the file which is associated to the object. |
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@r_cb is the context which holds all information. |
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@for_read is 1 if the file is opened for read only. |
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Return value: 0 on success. */ |
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gpgme_error_t |
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gpg_file_data_new (const char *fname, int flags, file_data_t *r_cb) |
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|
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{ |
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gpgme_error_t err; |
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file_data_t cb; |
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HANDLE fd = NULL; |
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SECURITY_ATTRIBUTES sec_attr; |
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|
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*r_cb = NULL; /* reset */ |
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memset (&sec_attr, 0, sizeof (sec_attr)); |
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sec_attr.bInheritHandle = FALSE; |
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sec_attr.nLength = sizeof (sec_attr); |
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if (flags & F_DATA_READ) { |
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fd = CreateFile (fname, GENERIC_READ, FILE_SHARE_READ, |
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&sec_attr, OPEN_EXISTING, 0, NULL); |
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if (fd == INVALID_HANDLE_VALUE) { |
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log_debug ("gpg_file_data_new: CreateFile() error=%d\r\n", |
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(int)GetLastError ()); |
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return gpgme_err_code_from_errno (ENOENT); |
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} |
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} |
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cb = new file_data_s; |
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if (!cb) |
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BUG (NULL); |
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memset (cb, 0, sizeof *cb); |
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cb->name = m_strdup (fname); |
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cb->cbs.read = read_cb; |
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cb->cbs.write = write_cb; |
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if (flags & F_DATA_READ) { |
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cb->handle = fd; |
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cb->size = GetFileSize (fd, NULL); |
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cb->off = 0; |
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} |
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|
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err = gpgme_data_new_from_cbs (&cb->dat, &cb->cbs, cb); |
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if (!err) |
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*r_cb = cb; |
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else { |
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CloseHandle (fd); |
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free_if_alloc (cb); |
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} |
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|
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return err; |
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} |
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|
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|
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/* Set the progress callback for the given object @ctx. */ |
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void |
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gpg_file_data_set_cb (file_data_t ctx, struct progress_filter_s *pfx) |
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{ |
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ctx->cb_value = (void*)pfx; |
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} |
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|
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|
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/* Set the file pointer to the begin again. */ |
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void |
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gpg_file_data_rewind (file_data_t ctx) |
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{ |
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SetFilePointer (ctx->handle, 0, NULL, FILE_BEGIN); |
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} |
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|
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|
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/* Release the context in @cb. |
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Close all internal handles if possible. */ |
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void |
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gpg_file_data_release (file_data_t cb) |
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{ |
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if (!cb) |
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return; |
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if (cb->handle) { |
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CloseHandle (cb->handle); |
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cb->handle = NULL; |
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} |
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if (cb->dat) { |
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gpgme_data_release (cb->dat); |
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cb->dat = NULL; |
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} |
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free_if_alloc (cb->name); |
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free_if_alloc (cb); |
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} |
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