mirror of https://github.com/facebook/rocksdb.git
65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "table/block_based/reader_common.h"
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#include "monitoring/perf_context_imp.h"
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#include "rocksdb/table.h"
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#include "table/format.h"
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#include "util/coding.h"
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#include "util/crc32c.h"
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#include "util/string_util.h"
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namespace ROCKSDB_NAMESPACE {
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void ForceReleaseCachedEntry(void* arg, void* h) {
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Cache* cache = static_cast<Cache*>(arg);
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Cache::Handle* handle = static_cast<Cache::Handle*>(h);
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cache->Release(handle, true /* erase_if_last_ref */);
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}
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// WART: this is specific to block-based table
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Status VerifyBlockChecksum(const Footer& footer, const char* data,
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size_t block_size, const std::string& file_name,
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uint64_t offset) {
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PERF_TIMER_GUARD(block_checksum_time);
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assert(footer.GetBlockTrailerSize() == 5);
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ChecksumType type = footer.checksum_type();
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// After block_size bytes is compression type (1 byte), which is part of
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// the checksummed section.
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size_t len = block_size + 1;
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// And then the stored checksum value (4 bytes).
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uint32_t stored = DecodeFixed32(data + len);
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uint32_t computed = ComputeBuiltinChecksum(type, data, len);
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// Unapply context to 'stored' rather than apply to 'computed, for people
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// who might look for reference crc value in error message
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uint32_t modifier =
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ChecksumModifierForContext(footer.base_context_checksum(), offset);
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stored -= modifier;
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if (stored == computed) {
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return Status::OK();
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} else {
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// Unmask for people who might look for reference crc value
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if (type == kCRC32c) {
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stored = crc32c::Unmask(stored);
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computed = crc32c::Unmask(computed);
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}
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return Status::Corruption(
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"block checksum mismatch: stored" +
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std::string(modifier ? "(context removed)" : "") + " = " +
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std::to_string(stored) + ", computed = " + std::to_string(computed) +
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", type = " + std::to_string(type) + " in " + file_name + " offset " +
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std::to_string(offset) + " size " + std::to_string(block_size));
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}
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}
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} // namespace ROCKSDB_NAMESPACE
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