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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 "writer.h"
#include <android-base/file.h>
#include "utility.h"
using android::base::ErrnoError;
using android::base::Result;
namespace android {
namespace fs_mgr {
std::string SerializeVBMetaTable(const VBMetaTable& input) {
std::string table;
table.append(reinterpret_cast<const char*>(&input.header), SUPER_VBMETA_HEADER_SIZE);
for (const auto& desc : input.descriptors) {
table.append(reinterpret_cast<const char*>(&desc), SUPER_VBMETA_DESCRIPTOR_SIZE);
table.append(desc.vbmeta_name);
}
// Ensure the size of vbmeta table is SUPER_VBMETA_TABLE_MAX_SIZE
table.resize(SUPER_VBMETA_TABLE_MAX_SIZE, '\0');
return table;
}
Result<void> WritePrimaryVBMetaTable(int fd, const std::string& table) {
const uint64_t offset = PRIMARY_SUPER_VBMETA_TABLE_OFFSET;
if (lseek(fd, offset, SEEK_SET) < 0) {
return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
}
if (!android::base::WriteFully(fd, table.data(), table.size())) {
return ErrnoError() << "Failed to write primary vbmeta table at offset " << offset;
}
return {};
}
Result<void> WriteBackupVBMetaTable(int fd, const std::string& table) {
const uint64_t offset = BACKUP_SUPER_VBMETA_TABLE_OFFSET;
if (lseek(fd, offset, SEEK_SET) < 0) {
return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
}
if (!android::base::WriteFully(fd, table.data(), table.size())) {
return ErrnoError() << "Failed to write backup vbmeta table at offset " << offset;
}
return {};
}
Result<void> WriteVBMetaImage(int fd, const uint8_t slot_number, const std::string& vbmeta_image) {
const uint64_t offset = IndexOffset(slot_number);
if (lseek(fd, offset, SEEK_SET) < 0) {
return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
}
if (!android::base::WriteFully(fd, vbmeta_image.data(), vbmeta_image.size())) {
return ErrnoError() << "Failed to write vbmeta image at offset " << offset;
}
return {};
}
} // namespace fs_mgr
} // namespace android
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