| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 <fs/fs.h> |
| #include <mgmt/mgmt.h> |
| #include <fs_mgmt/fs_mgmt_impl.h> |
| |
| int |
| fs_mgmt_impl_filelen(const char *path, size_t *out_len) |
| { |
| struct fs_dirent dirent; |
| int rc; |
| |
| rc = fs_stat(path, &dirent); |
| if (rc != 0) { |
| return MGMT_ERR_EUNKNOWN; |
| } |
| |
| if (dirent.type != FS_DIR_ENTRY_FILE) { |
| return MGMT_ERR_EUNKNOWN; |
| } |
| |
| *out_len = dirent.size; |
| |
| return 0; |
| } |
| |
| int |
| fs_mgmt_impl_read(const char *path, size_t offset, size_t len, |
| void *out_data, size_t *out_len) |
| { |
| struct fs_file_t file; |
| ssize_t bytes_read; |
| int rc; |
| |
| rc = fs_open(&file, path, FS_O_READ); |
| if (rc != 0) { |
| return MGMT_ERR_ENOENT; |
| } |
| |
| rc = fs_seek(&file, offset, FS_SEEK_SET); |
| if (rc != 0) { |
| goto done; |
| } |
| |
| bytes_read = fs_read(&file, out_data, len); |
| if (bytes_read < 0) { |
| goto done; |
| } |
| |
| *out_len = bytes_read; |
| |
| done: |
| fs_close(&file); |
| |
| if (rc != 0) { |
| return MGMT_ERR_EUNKNOWN; |
| } else { |
| return 0; |
| } |
| } |
| |
| static int |
| zephyr_fs_mgmt_truncate(const char *path) |
| { |
| size_t len; |
| int rc; |
| |
| /* Attempt to get the length of the file at the specified path. This is a |
| * quick way to determine if there is already a file there. |
| */ |
| rc = fs_mgmt_impl_filelen(path, &len); |
| if (rc == 0) { |
| /* There is already a file with the specified path. Unlink it to |
| * simulate a truncate operation. |
| * |
| * XXX: This isn't perfect - if the file is currently open, the unlink |
| * operation won't actually delete the file. Consequently, the file |
| * will get partially overwritten rather than truncated. The NFFS port |
| * doesn't support the truncate operation, so this is an imperfect |
| * workaround. |
| */ |
| rc = fs_unlink(path); |
| if (rc != 0) { |
| return MGMT_ERR_EUNKNOWN; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int |
| fs_mgmt_impl_write(const char *path, size_t offset, const void *data, |
| size_t len) |
| { |
| struct fs_file_t file; |
| int rc; |
| |
| /* Truncate the file before writing the first chunk. This is done to |
| * properly handle an overwrite of an existing file. |
| * |
| */ |
| if (offset == 0) { |
| rc = zephyr_fs_mgmt_truncate(path); |
| if (rc != 0) { |
| return rc; |
| } |
| } |
| |
| rc = fs_open(&file, path, FS_O_CREATE | FS_O_WRITE); |
| if (rc != 0) { |
| return MGMT_ERR_EUNKNOWN; |
| } |
| |
| rc = fs_seek(&file, offset, FS_SEEK_SET); |
| if (rc != 0) { |
| goto done; |
| } |
| |
| rc = fs_write(&file, data, len); |
| if (rc < 0) { |
| goto done; |
| } |
| |
| rc = 0; |
| |
| done: |
| fs_close(&file); |
| |
| if (rc != 0) { |
| return MGMT_ERR_EUNKNOWN; |
| } else { |
| return 0; |
| } |
| } |