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