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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 "fuse_provider.h"
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <functional>
#include <android-base/file.h>
#include "fuse_sideload.h"
FuseFileDataProvider::FuseFileDataProvider(const std::string& path, uint32_t block_size) {
struct stat sb;
if (stat(path.c_str(), &sb) == -1) {
fprintf(stderr, "failed to stat %s: %s\n", path.c_str(), strerror(errno));
return;
}
fd_.reset(open(path.c_str(), O_RDONLY));
if (fd_ == -1) {
fprintf(stderr, "failed to open %s: %s\n", path.c_str(), strerror(errno));
return;
}
file_size_ = sb.st_size;
fuse_block_size_ = block_size;
}
bool FuseFileDataProvider::ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size,
uint32_t start_block) const {
uint64_t offset = static_cast<uint64_t>(start_block) * fuse_block_size_;
if (fetch_size > file_size_ || offset > file_size_ - fetch_size) {
fprintf(stderr,
"Out of bound read, start block: %" PRIu32 ", fetch size: %" PRIu32
", file size %" PRIu64 "\n",
start_block, fetch_size, file_size_);
return false;
}
if (!android::base::ReadFullyAtOffset(fd_, buffer, fetch_size, offset)) {
fprintf(stderr, "Failed to read fetch size: %" PRIu32 " bytes data at offset %" PRIu64 ": %s\n",
fetch_size, offset, strerror(errno));
return false;
}
return true;
}
void FuseFileDataProvider::Close() {
fd_.reset();
}
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