/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fuse_provider.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <functional>
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#include <android-base/file.h>
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#include "fuse_sideload.h"
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FuseFileDataProvider::FuseFileDataProvider(const std::string& path, uint32_t block_size) {
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struct stat sb;
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if (stat(path.c_str(), &sb) == -1) {
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fprintf(stderr, "failed to stat %s: %s\n", path.c_str(), strerror(errno));
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return;
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}
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fd_.reset(open(path.c_str(), O_RDONLY));
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if (fd_ == -1) {
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fprintf(stderr, "failed to open %s: %s\n", path.c_str(), strerror(errno));
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return;
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}
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file_size_ = sb.st_size;
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fuse_block_size_ = block_size;
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}
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bool FuseFileDataProvider::ReadBlockAlignedData(uint8_t* buffer, uint32_t fetch_size,
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uint32_t start_block) const {
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uint64_t offset = static_cast<uint64_t>(start_block) * fuse_block_size_;
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if (fetch_size > file_size_ || offset > file_size_ - fetch_size) {
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fprintf(stderr,
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"Out of bound read, start block: %" PRIu32 ", fetch size: %" PRIu32
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", file size %" PRIu64 "\n",
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start_block, fetch_size, file_size_);
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return false;
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}
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if (!android::base::ReadFullyAtOffset(fd_, buffer, fetch_size, offset)) {
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fprintf(stderr, "Failed to read fetch size: %" PRIu32 " bytes data at offset %" PRIu64 ": %s\n",
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fetch_size, offset, strerror(errno));
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return false;
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}
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return true;
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}
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void FuseFileDataProvider::Close() {
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fd_.reset();
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}
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