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Diffstat (limited to 'src/leveldb/db/dbformat.cc')
-rw-r--r-- | src/leveldb/db/dbformat.cc | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/src/leveldb/db/dbformat.cc b/src/leveldb/db/dbformat.cc deleted file mode 100644 index 28e11b398d..0000000000 --- a/src/leveldb/db/dbformat.cc +++ /dev/null @@ -1,140 +0,0 @@ -// 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 <stdio.h> -#include "db/dbformat.h" -#include "port/port.h" -#include "util/coding.h" - -namespace leveldb { - -static uint64_t PackSequenceAndType(uint64_t seq, ValueType t) { - assert(seq <= kMaxSequenceNumber); - assert(t <= kValueTypeForSeek); - return (seq << 8) | t; -} - -void AppendInternalKey(std::string* result, const ParsedInternalKey& key) { - result->append(key.user_key.data(), key.user_key.size()); - PutFixed64(result, PackSequenceAndType(key.sequence, key.type)); -} - -std::string ParsedInternalKey::DebugString() const { - char buf[50]; - snprintf(buf, sizeof(buf), "' @ %llu : %d", - (unsigned long long) sequence, - int(type)); - std::string result = "'"; - result += user_key.ToString(); - result += buf; - return result; -} - -std::string InternalKey::DebugString() const { - std::string result; - ParsedInternalKey parsed; - if (ParseInternalKey(rep_, &parsed)) { - result = parsed.DebugString(); - } else { - result = "(bad)"; - result.append(EscapeString(rep_)); - } - return result; -} - -const char* InternalKeyComparator::Name() const { - return "leveldb.InternalKeyComparator"; -} - -int InternalKeyComparator::Compare(const Slice& akey, const Slice& bkey) const { - // Order by: - // increasing user key (according to user-supplied comparator) - // decreasing sequence number - // decreasing type (though sequence# should be enough to disambiguate) - int r = user_comparator_->Compare(ExtractUserKey(akey), ExtractUserKey(bkey)); - if (r == 0) { - const uint64_t anum = DecodeFixed64(akey.data() + akey.size() - 8); - const uint64_t bnum = DecodeFixed64(bkey.data() + bkey.size() - 8); - if (anum > bnum) { - r = -1; - } else if (anum < bnum) { - r = +1; - } - } - return r; -} - -void InternalKeyComparator::FindShortestSeparator( - std::string* start, - const Slice& limit) const { - // Attempt to shorten the user portion of the key - Slice user_start = ExtractUserKey(*start); - Slice user_limit = ExtractUserKey(limit); - std::string tmp(user_start.data(), user_start.size()); - user_comparator_->FindShortestSeparator(&tmp, user_limit); - if (tmp.size() < user_start.size() && - user_comparator_->Compare(user_start, tmp) < 0) { - // User key has become shorter physically, but larger logically. - // Tack on the earliest possible number to the shortened user key. - PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,kValueTypeForSeek)); - assert(this->Compare(*start, tmp) < 0); - assert(this->Compare(tmp, limit) < 0); - start->swap(tmp); - } -} - -void InternalKeyComparator::FindShortSuccessor(std::string* key) const { - Slice user_key = ExtractUserKey(*key); - std::string tmp(user_key.data(), user_key.size()); - user_comparator_->FindShortSuccessor(&tmp); - if (tmp.size() < user_key.size() && - user_comparator_->Compare(user_key, tmp) < 0) { - // User key has become shorter physically, but larger logically. - // Tack on the earliest possible number to the shortened user key. - PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,kValueTypeForSeek)); - assert(this->Compare(*key, tmp) < 0); - key->swap(tmp); - } -} - -const char* InternalFilterPolicy::Name() const { - return user_policy_->Name(); -} - -void InternalFilterPolicy::CreateFilter(const Slice* keys, int n, - std::string* dst) const { - // We rely on the fact that the code in table.cc does not mind us - // adjusting keys[]. - Slice* mkey = const_cast<Slice*>(keys); - for (int i = 0; i < n; i++) { - mkey[i] = ExtractUserKey(keys[i]); - // TODO(sanjay): Suppress dups? - } - user_policy_->CreateFilter(keys, n, dst); -} - -bool InternalFilterPolicy::KeyMayMatch(const Slice& key, const Slice& f) const { - return user_policy_->KeyMayMatch(ExtractUserKey(key), f); -} - -LookupKey::LookupKey(const Slice& user_key, SequenceNumber s) { - size_t usize = user_key.size(); - size_t needed = usize + 13; // A conservative estimate - char* dst; - if (needed <= sizeof(space_)) { - dst = space_; - } else { - dst = new char[needed]; - } - start_ = dst; - dst = EncodeVarint32(dst, usize + 8); - kstart_ = dst; - memcpy(dst, user_key.data(), usize); - dst += usize; - EncodeFixed64(dst, PackSequenceAndType(s, kValueTypeForSeek)); - dst += 8; - end_ = dst; -} - -} // namespace leveldb |