mirror of https://github.com/ArduPilot/ardupilot
74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "AP_Filesystem.h"
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/*
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load a full file. Use delete to free the data
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*/
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FileData *AP_Filesystem_Backend::load_file(const char *filename)
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{
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struct stat st;
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if (stat(filename, &st) != 0) {
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return nullptr;
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}
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FileData *fd = new FileData(this);
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if (fd == nullptr) {
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return nullptr;
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}
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void *data = malloc(st.st_size);
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if (data == nullptr) {
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delete fd;
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return nullptr;
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}
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int d = open(filename, O_RDONLY);
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if (d == -1) {
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free(data);
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delete fd;
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return nullptr;
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}
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if (read(d, data, st.st_size) != st.st_size) {
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close(d);
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free(data);
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delete fd;
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return nullptr;
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}
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close(d);
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fd->length = st.st_size;
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fd->data = (const uint8_t *)data;
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return fd;
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}
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/*
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unload a FileData object
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*/
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void AP_Filesystem_Backend::unload_file(FileData *fd)
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{
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if (fd->data != nullptr) {
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free(const_cast<uint8_t *>(fd->data));
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fd->data = nullptr;
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}
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}
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/*
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destructor for FileData
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*/
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FileData::~FileData()
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{
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if (backend != nullptr) {
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((AP_Filesystem_Backend *)backend)->unload_file(this);
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}
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}
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