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-rw-r--r--src/leveldb/table/format.h108
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diff --git a/src/leveldb/table/format.h b/src/leveldb/table/format.h
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-// 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.
-
-#ifndef STORAGE_LEVELDB_TABLE_FORMAT_H_
-#define STORAGE_LEVELDB_TABLE_FORMAT_H_
-
-#include <string>
-#include <stdint.h>
-#include "leveldb/slice.h"
-#include "leveldb/status.h"
-#include "leveldb/table_builder.h"
-
-namespace leveldb {
-
-class Block;
-class RandomAccessFile;
-struct ReadOptions;
-
-// BlockHandle is a pointer to the extent of a file that stores a data
-// block or a meta block.
-class BlockHandle {
- public:
- BlockHandle();
-
- // The offset of the block in the file.
- uint64_t offset() const { return offset_; }
- void set_offset(uint64_t offset) { offset_ = offset; }
-
- // The size of the stored block
- uint64_t size() const { return size_; }
- void set_size(uint64_t size) { size_ = size; }
-
- void EncodeTo(std::string* dst) const;
- Status DecodeFrom(Slice* input);
-
- // Maximum encoding length of a BlockHandle
- enum { kMaxEncodedLength = 10 + 10 };
-
- private:
- uint64_t offset_;
- uint64_t size_;
-};
-
-// Footer encapsulates the fixed information stored at the tail
-// end of every table file.
-class Footer {
- public:
- Footer() { }
-
- // The block handle for the metaindex block of the table
- const BlockHandle& metaindex_handle() const { return metaindex_handle_; }
- void set_metaindex_handle(const BlockHandle& h) { metaindex_handle_ = h; }
-
- // The block handle for the index block of the table
- const BlockHandle& index_handle() const {
- return index_handle_;
- }
- void set_index_handle(const BlockHandle& h) {
- index_handle_ = h;
- }
-
- void EncodeTo(std::string* dst) const;
- Status DecodeFrom(Slice* input);
-
- // Encoded length of a Footer. Note that the serialization of a
- // Footer will always occupy exactly this many bytes. It consists
- // of two block handles and a magic number.
- enum {
- kEncodedLength = 2*BlockHandle::kMaxEncodedLength + 8
- };
-
- private:
- BlockHandle metaindex_handle_;
- BlockHandle index_handle_;
-};
-
-// kTableMagicNumber was picked by running
-// echo http://code.google.com/p/leveldb/ | sha1sum
-// and taking the leading 64 bits.
-static const uint64_t kTableMagicNumber = 0xdb4775248b80fb57ull;
-
-// 1-byte type + 32-bit crc
-static const size_t kBlockTrailerSize = 5;
-
-struct BlockContents {
- Slice data; // Actual contents of data
- bool cachable; // True iff data can be cached
- bool heap_allocated; // True iff caller should delete[] data.data()
-};
-
-// Read the block identified by "handle" from "file". On failure
-// return non-OK. On success fill *result and return OK.
-extern Status ReadBlock(RandomAccessFile* file,
- const ReadOptions& options,
- const BlockHandle& handle,
- BlockContents* result);
-
-// Implementation details follow. Clients should ignore,
-
-inline BlockHandle::BlockHandle()
- : offset_(~static_cast<uint64_t>(0)),
- size_(~static_cast<uint64_t>(0)) {
-}
-
-} // namespace leveldb
-
-#endif // STORAGE_LEVELDB_TABLE_FORMAT_H_