Diff: mbed-os/features/filesystem/bd/SlicingBlockDevice.cpp

Revision:

0:9fca2b23d0ba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/features/filesystem/bd/SlicingBlockDevice.cpp	Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,103 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "SlicingBlockDevice.h"
+
+
+SlicingBlockDevice::SlicingBlockDevice(BlockDevice *bd, bd_addr_t start, bd_addr_t stop)
+    : _bd(bd)
+    , _start_from_end(false), _start(start)
+    , _stop_from_end(false), _stop(stop)
+{
+    if ((int64_t)_start < 0) {
+        _start_from_end = true;
+        _start = -_start;
+    }
+
+    if ((int64_t)_stop <= 0) {
+        _stop_from_end = true;
+        _stop = -_stop;
+    }
+}
+
+int SlicingBlockDevice::init()
+{
+    int err = _bd->init();
+    if (err) {
+        return err;
+    }
+
+    bd_size_t size = _bd->size();
+
+    // Calculate from_end values
+    if (_start_from_end) {
+        _start_from_end = false;
+        _start = size - _start;
+    }
+
+    if (_stop_from_end) {
+        _stop_from_end = false;
+        _stop = size - _stop;
+    }
+
+    // Check that block addresses are valid
+    MBED_ASSERT(_bd->is_valid_erase(_start, _stop - _start));
+
+    return 0;
+}
+
+int SlicingBlockDevice::deinit()
+{
+    return _bd->deinit();
+}
+
+int SlicingBlockDevice::read(void *b, bd_addr_t addr, bd_size_t size)
+{
+    MBED_ASSERT(is_valid_read(addr, size));
+    return _bd->read(b, addr + _start, size);
+}
+
+int SlicingBlockDevice::program(const void *b, bd_addr_t addr, bd_size_t size)
+{
+    MBED_ASSERT(is_valid_program(addr, size));
+    return _bd->program(b, addr + _start, size);
+}
+
+int SlicingBlockDevice::erase(bd_addr_t addr, bd_size_t size)
+{
+    MBED_ASSERT(is_valid_erase(addr, size));
+    return _bd->erase(addr + _start, size);
+}
+
+bd_size_t SlicingBlockDevice::get_read_size() const
+{
+    return _bd->get_read_size();
+}
+
+bd_size_t SlicingBlockDevice::get_program_size() const
+{
+    return _bd->get_program_size();
+}
+
+bd_size_t SlicingBlockDevice::get_erase_size() const
+{
+    return _bd->get_erase_size();
+}
+
+bd_size_t SlicingBlockDevice::size() const
+{
+    return _stop - _start;
+}