From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Sun, 27 Sep 2009 13:22:15 +0000 (+0000)
Subject: Add new module kfile_mem: kfile access over a plain memory buffer.
X-Git-Tag: 2.3.0~104
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=e4b96c973d54ffbd7950253295c6686a9db08b0a;p=bertos.git

Add new module kfile_mem: kfile access over a plain memory buffer.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@2976 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/bertos/struct/kfile_mem.c b/bertos/struct/kfile_mem.c
new file mode 100644
index 00000000..5560fdc6
--- /dev/null
+++ b/bertos/struct/kfile_mem.c
@@ -0,0 +1,83 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief KFile interface over a memory buffer.
+ *
+ * \version $Id: cfg_adc.h 2348 2009-02-16 13:43:44Z duplo $
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#include "kfile_mem.h"
+
+#include <kern/kfile.h>
+
+#include <string.h>
+
+static size_t kfilemem_read(struct KFile *_fd, void *buf, size_t size)
+{
+	KFileMem *fd = KFILEMEM_CAST(_fd);
+
+	size = MIN((kfile_off_t)size, fd->fd.size - fd->fd.seek_pos);
+	uint8_t *mem = (uint8_t *)fd->mem;
+	memcpy(buf, mem + fd->fd.seek_pos, size);
+	fd->fd.seek_pos += size;
+
+	return size;
+}
+
+static size_t kfilemem_write(struct KFile *_fd, const void *buf, size_t size)
+{
+	KFileMem *fd = KFILEMEM_CAST(_fd);
+
+	size = MIN((kfile_off_t)size, fd->fd.size - fd->fd.seek_pos);
+	uint8_t *mem = (uint8_t *)fd->mem;
+	memcpy(mem + fd->fd.seek_pos, buf, size);
+	fd->fd.seek_pos += size;
+
+	return size;
+}
+
+void kfilemem_init(KFileMem *km, void *mem, size_t len)
+{
+	ASSERT(km);
+	ASSERT(mem);
+	ASSERT(len);
+
+	memset(km, 0, sizeof(*km));
+
+	km->mem = mem;
+	kfile_init(&km->fd);
+	km->fd.read = kfilemem_read;
+	km->fd.write = kfilemem_write;
+	km->fd.size = len;
+	DB(km->fd._type = KFT_KFILEMEM);
+}
diff --git a/bertos/struct/kfile_mem.h b/bertos/struct/kfile_mem.h
new file mode 100644
index 00000000..695e6648
--- /dev/null
+++ b/bertos/struct/kfile_mem.h
@@ -0,0 +1,79 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief KFile interface over a memory buffer.
+ *
+ * Convenient way to access a memory region using the KFile interface.
+ *
+ *
+ * \version $Id: cfg_adc.h 2348 2009-02-16 13:43:44Z duplo $
+ * \author Francesco Sacchi <batt@develer.com>
+ *
+ * $WIZ$ module_name = "kfilemem"
+ * $WIZ$ module_depends = "kfile"
+ */
+
+#ifndef STRUCT_KFILE_MEM
+#define STRUCT_KFILE_MEM
+
+#include <kern/kfile.h>
+
+typedef struct KFileMem
+{
+		KFile fd;
+		void *mem;
+} KFileMem;
+
+/**
+ * ID for KFile Mem.
+ */
+#define KFT_KFILEMEM MAKE_ID('M', 'E', 'M', '0')
+
+/**
+ * Convert + ASSERT from generic KFile to KFileMem.
+ */
+INLINE KFileMem * KFILEMEM_CAST(KFile *fd)
+{
+	ASSERT(fd->_type == KFT_KFILEMEM);
+	return (KFileMem *)fd;
+}
+
+/**
+ * Initialize KFileMem struct.
+ *
+ * \param kf Interface to initialize.
+ * \param mem Pointer to the memory buffer to operate on.
+ * \param len Size of the buffer
+ */
+void kfilemem_init(KFileMem *kf, void *mem, size_t len);
+
+#endif /* STRUCT_KFILE_MEM */