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-rw-r--r--include/leveldb/slice.h104
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diff --git a/include/leveldb/slice.h b/include/leveldb/slice.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.
-//
-// Slice is a simple structure containing a pointer into some external
-// storage and a size. The user of a Slice must ensure that the slice
-// is not used after the corresponding external storage has been
-// deallocated.
-
-#ifndef STORAGE_LEVELDB_INCLUDE_SLICE_H_
-#define STORAGE_LEVELDB_INCLUDE_SLICE_H_
-
-#include <assert.h>
-#include <stddef.h>
-#include <string.h>
-#include <string>
-
-namespace leveldb {
-
-class Slice {
- public:
- // Create an empty slice.
- Slice() : data_(""), size_(0) { }
-
- // Create a slice that refers to data[0,n-1].
- Slice(const char* data, size_t n) : data_(data), size_(n) { }
-
- // Create a slice that refers to the contents of "s"
- Slice(const std::string& s) : data_(s.data()), size_(s.size()) { }
-
- // Create a slice that refers to s[0,strlen(s)-1]
- Slice(const char* s) : data_(s), size_(strlen(s)) { }
-
- // Return a pointer to the beginning of the referenced data
- const char* data() const { return data_; }
-
- // Return the length (in bytes) of the referenced data
- size_t size() const { return size_; }
-
- // Return true iff the length of the referenced data is zero
- bool empty() const { return size_ == 0; }
-
- // Return the ith byte in the referenced data.
- // REQUIRES: n < size()
- char operator[](size_t n) const {
- assert(n < size());
- return data_[n];
- }
-
- // Change this slice to refer to an empty array
- void clear() { data_ = ""; size_ = 0; }
-
- // Drop the first "n" bytes from this slice.
- void remove_prefix(size_t n) {
- assert(n <= size());
- data_ += n;
- size_ -= n;
- }
-
- // Return a string that contains the copy of the referenced data.
- std::string ToString() const { return std::string(data_, size_); }
-
- // Three-way comparison. Returns value:
- // < 0 iff "*this" < "b",
- // == 0 iff "*this" == "b",
- // > 0 iff "*this" > "b"
- int compare(const Slice& b) const;
-
- // Return true iff "x" is a prefix of "*this"
- bool starts_with(const Slice& x) const {
- return ((size_ >= x.size_) &&
- (memcmp(data_, x.data_, x.size_) == 0));
- }
-
- private:
- const char* data_;
- size_t size_;
-
- // Intentionally copyable
-};
-
-inline bool operator==(const Slice& x, const Slice& y) {
- return ((x.size() == y.size()) &&
- (memcmp(x.data(), y.data(), x.size()) == 0));
-}
-
-inline bool operator!=(const Slice& x, const Slice& y) {
- return !(x == y);
-}
-
-inline int Slice::compare(const Slice& b) const {
- const int min_len = (size_ < b.size_) ? size_ : b.size_;
- int r = memcmp(data_, b.data_, min_len);
- if (r == 0) {
- if (size_ < b.size_) r = -1;
- else if (size_ > b.size_) r = +1;
- }
- return r;
-}
-
-}
-
-
-#endif // STORAGE_LEVELDB_INCLUDE_SLICE_H_