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git-svn-id: https://leveldb.googlecode.com/svn/trunk@22 62dab493-f737-651d-591e-8d6aee1b9529

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diff --git a/db/dbformat.h b/db/dbformat.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_DB_FORMAT_H_
-#define STORAGE_LEVELDB_DB_FORMAT_H_
-
-#include <stdio.h>
-#include "leveldb/comparator.h"
-#include "leveldb/db.h"
-#include "leveldb/slice.h"
-#include "leveldb/table_builder.h"
-#include "util/coding.h"
-#include "util/logging.h"
-
-namespace leveldb {
-
-// Grouping of constants.  We may want to make some of these
-// parameters set via options.
-namespace config {
-static const int kNumLevels = 7;
-}
-
-class InternalKey;
-
-// Value types encoded as the last component of internal keys.
-// DO NOT CHANGE THESE ENUM VALUES: they are embedded in the on-disk
-// data structures.
-enum ValueType {
-  kTypeDeletion = 0x0,
-  kTypeValue = 0x1,
-  kTypeLargeValueRef = 0x2,
-};
-// kValueTypeForSeek defines the ValueType that should be passed when
-// constructing a ParsedInternalKey object for seeking to a particular
-// sequence number (since we sort sequence numbers in decreasing order
-// and the value type is embedded as the low 8 bits in the sequence
-// number in internal keys, we need to use the highest-numbered
-// ValueType, not the lowest).
-static const ValueType kValueTypeForSeek = kTypeLargeValueRef;
-
-typedef uint64_t SequenceNumber;
-
-// We leave eight bits empty at the bottom so a type and sequence#
-// can be packed together into 64-bits.
-static const SequenceNumber kMaxSequenceNumber =
-    ((0x1ull << 56) - 1);
-
-struct ParsedInternalKey {
-  Slice user_key;
-  SequenceNumber sequence;
-  ValueType type;
-
-  ParsedInternalKey() { }  // Intentionally left uninitialized (for speed)
-  ParsedInternalKey(const Slice& u, const SequenceNumber& seq, ValueType t)
-      : user_key(u), sequence(seq), type(t) { }
-  std::string DebugString() const;
-};
-
-// Return the length of the encoding of "key".
-inline size_t InternalKeyEncodingLength(const ParsedInternalKey& key) {
-  return key.user_key.size() + 8;
-}
-
-// Append the serialization of "key" to *result.
-extern void AppendInternalKey(std::string* result,
-                              const ParsedInternalKey& key);
-
-// Attempt to parse an internal key from "internal_key".  On success,
-// stores the parsed data in "*result", and returns true.
-//
-// On error, returns false, leaves "*result" in an undefined state.
-extern bool ParseInternalKey(const Slice& internal_key,
-                             ParsedInternalKey* result);
-
-// Returns the user key portion of an internal key.
-inline Slice ExtractUserKey(const Slice& internal_key) {
-  assert(internal_key.size() >= 8);
-  return Slice(internal_key.data(), internal_key.size() - 8);
-}
-
-inline ValueType ExtractValueType(const Slice& internal_key) {
-  assert(internal_key.size() >= 8);
-  const size_t n = internal_key.size();
-  uint64_t num = DecodeFixed64(internal_key.data() + n - 8);
-  unsigned char c = num & 0xff;
-  return static_cast<ValueType>(c);
-}
-
-// A comparator for internal keys that uses a specified comparator for
-// the user key portion and breaks ties by decreasing sequence number.
-class InternalKeyComparator : public Comparator {
- private:
-  const Comparator* user_comparator_;
- public:
-  explicit InternalKeyComparator(const Comparator* c) : user_comparator_(c) { }
-  virtual const char* Name() const;
-  virtual int Compare(const Slice& a, const Slice& b) const;
-  virtual void FindShortestSeparator(
-      std::string* start,
-      const Slice& limit) const;
-  virtual void FindShortSuccessor(std::string* key) const;
-
-  const Comparator* user_comparator() const { return user_comparator_; }
-
-  int Compare(const InternalKey& a, const InternalKey& b) const;
-};
-
-// Modules in this directory should keep internal keys wrapped inside
-// the following class instead of plain strings so that we do not
-// incorrectly use string comparisons instead of an InternalKeyComparator.
-class InternalKey {
- private:
-  std::string rep_;
- public:
-  InternalKey() { }   // Leave rep_ as empty to indicate it is invalid
-  InternalKey(const Slice& user_key, SequenceNumber s, ValueType t) {
-    AppendInternalKey(&rep_, ParsedInternalKey(user_key, s, t));
-  }
-
-  void DecodeFrom(const Slice& s) { rep_.assign(s.data(), s.size()); }
-  Slice Encode() const {
-    assert(!rep_.empty());
-    return rep_;
-  }
-
-  Slice user_key() const { return ExtractUserKey(rep_); }
-
-  void SetFrom(const ParsedInternalKey& p) {
-    rep_.clear();
-    AppendInternalKey(&rep_, p);
-  }
-
-  void Clear() { rep_.clear(); }
-};
-
-inline int InternalKeyComparator::Compare(
-    const InternalKey& a, const InternalKey& b) const {
-  return Compare(a.Encode(), b.Encode());
-}
-
-// LargeValueRef is a 160-bit hash value (20 bytes), plus an 8 byte
-// uncompressed size, and a 1 byte CompressionType code.  An
-// encoded form of it is embedded in the filenames of large value
-// files stored in the database, and the raw binary form is stored as
-// the iter->value() result for values of type kTypeLargeValueRef in
-// the table and log files that make up the database.
-struct LargeValueRef {
-  char data[29];
-
-  // Initialize a large value ref for the given data
-  static LargeValueRef Make(const Slice& data,
-                            CompressionType compression_type);
-
-  // Initialize a large value ref from a serialized, 29-byte reference value
-  static LargeValueRef FromRef(const Slice& ref) {
-    LargeValueRef result;
-    assert(ref.size() == sizeof(result.data));
-    memcpy(result.data, ref.data(), sizeof(result.data));
-    return result;
-  }
-
-  // Return the number of bytes in a LargeValueRef (not the
-  // number of bytes in the value referenced).
-  static size_t ByteSize() { return sizeof(LargeValueRef().data); }
-
-  // Return the number of bytes in the value referenced by "*this".
-  uint64_t ValueSize() const { return DecodeFixed64(&data[20]); }
-
-  CompressionType compression_type() const {
-    return static_cast<CompressionType>(data[28]);
-  }
-
-  bool operator==(const LargeValueRef& b) const {
-    return memcmp(data, b.data, sizeof(data)) == 0;
-  }
-  bool operator<(const LargeValueRef& b) const {
-    return memcmp(data, b.data, sizeof(data)) < 0;
-  }
-};
-
-// Convert the large value ref to a human-readable string suitable
-// for embedding in a large value filename.
-extern std::string LargeValueRefToFilenameString(const LargeValueRef& h);
-
-// Parse the large value filename string in "input" and store it in
-// "*h".  If successful, returns true.  Otherwise returns false.
-extern bool FilenameStringToLargeValueRef(const Slice& in, LargeValueRef* ref);
-
-inline bool ParseInternalKey(const Slice& internal_key,
-                             ParsedInternalKey* result) {
-  const size_t n = internal_key.size();
-  if (n < 8) return false;
-  uint64_t num = DecodeFixed64(internal_key.data() + n - 8);
-  unsigned char c = num & 0xff;
-  result->sequence = num >> 8;
-  result->type = static_cast<ValueType>(c);
-  result->user_key = Slice(internal_key.data(), n - 8);
-  return (c <= static_cast<unsigned char>(kTypeLargeValueRef));
-}
-
-}
-
-#endif  // STORAGE_LEVELDB_DB_FORMAT_H_