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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 "misc_writer/misc_writer.h"
#include <string.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <bootloader_message/bootloader_message.h>
namespace android {
namespace hardware {
namespace google {
namespace pixel {
bool MiscWriter::OffsetAndSizeInVendorSpace(size_t offset, size_t size) {
auto total_size = WIPE_PACKAGE_OFFSET_IN_MISC - VENDOR_SPACE_OFFSET_IN_MISC;
return size <= total_size && offset <= total_size - size;
}
bool MiscWriter::WriteMiscPartitionVendorSpace(const void* data, size_t size, size_t offset,
std::string* err) {
if (!OffsetAndSizeInVendorSpace(offset, size)) {
*err = android::base::StringPrintf("Out of bound write (offset %zu size %zu)", offset, size);
return false;
}
auto misc_blk_device = get_misc_blk_device(err);
if (misc_blk_device.empty()) {
return false;
}
return write_misc_partition(data, size, misc_blk_device, VENDOR_SPACE_OFFSET_IN_MISC + offset,
err);
}
bool MiscWriter::PerformAction(std::optional<size_t> override_offset) {
size_t offset = 0;
std::string content;
switch (action_) {
case MiscWriterActions::kSetDarkThemeFlag:
case MiscWriterActions::kClearDarkThemeFlag:
offset = override_offset.value_or(kThemeFlagOffsetInVendorSpace);
content = (action_ == MiscWriterActions::kSetDarkThemeFlag)
? kDarkThemeFlag
: std::string(strlen(kDarkThemeFlag), 0);
break;
case MiscWriterActions::kSetSotaFlag:
case MiscWriterActions::kClearSotaFlag:
offset = override_offset.value_or(kSotaFlagOffsetInVendorSpace);
content = (action_ == MiscWriterActions::kSetSotaFlag) ? kSotaFlag
: std::string(strlen(kSotaFlag), 0);
break;
case MiscWriterActions::kUnset:
LOG(ERROR) << "The misc writer action must be set";
return false;
}
if (std::string err;
!WriteMiscPartitionVendorSpace(content.data(), content.size(), offset, &err)) {
LOG(ERROR) << "Failed to write " << content << " at offset " << offset << " : " << err;
return false;
}
return true;
}
} // namespace pixel
} // namespace google
} // namespace hardware
} // namespace android
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