leveldb::Footer Class Reference

#include <format.h>

Collaboration diagram for leveldb::Footer:

Public Types
enum	{ kEncodedLength = 2*BlockHandle::kMaxEncodedLength + 8 }

Public Member Functions
	Footer ()
const BlockHandle &	metaindex_handle () const
void	set_metaindex_handle (const BlockHandle &h)
const BlockHandle &	index_handle () const
void	set_index_handle (const BlockHandle &h)
void	EncodeTo (std::string *dst) const
Status	DecodeFrom (Slice *input)

Private Attributes
BlockHandle	metaindex_handle_
BlockHandle	index_handle_

Detailed Description

Definition at line 47 of file format.h.

Member Enumeration Documentation

anonymous enum

anonymous enum

Enumerator
kEncodedLength

Definition at line 69 of file format.h.

       {
    kEncodedLength = 2*BlockHandle::kMaxEncodedLength + 8
  };

Constructor & Destructor Documentation

Footer()

leveldb::Footer::Footer ( )

inline

Definition at line 49 of file format.h.

{ }

Member Function Documentation

DecodeFrom()

Status leveldb::Footer::DecodeFrom

(

Slice *

input

)

Definition at line 43 of file format.cc.

                                      {
  const char* magic_ptr = input->data() + kEncodedLength - 8;
  const uint32_t magic_lo = DecodeFixed32(magic_ptr);
  const uint32_t magic_hi = DecodeFixed32(magic_ptr + 4);
  const uint64_t magic = ((static_cast<uint64_t>(magic_hi) << 32) |
                          (static_cast<uint64_t>(magic_lo)));
  if (magic != kTableMagicNumber) {
    return Status::Corruption("not an sstable (bad magic number)");
  }

  Status result = metaindex_handle_.DecodeFrom(input);
  if (result.ok()) {
    result = index_handle_.DecodeFrom(input);
  }
  if (result.ok()) {
    // We skip over any leftover data (just padding for now) in "input"
    const char* end = magic_ptr + 8;
    *input = Slice(end, input->data() + input->size() - end);
  }
  return result;
}

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EncodeTo()

void leveldb::Footer::EncodeTo

(

std::string *

dst

)

const

Definition at line 32 of file format.cc.

                                          {
  const size_t original_size = dst->size();
  metaindex_handle_.EncodeTo(dst);
  index_handle_.EncodeTo(dst);
  dst->resize(2 * BlockHandle::kMaxEncodedLength);  // Padding
  PutFixed32(dst, static_cast<uint32_t>(kTableMagicNumber & 0xffffffffu));
  PutFixed32(dst, static_cast<uint32_t>(kTableMagicNumber >> 32));
  assert(dst->size() == original_size + kEncodedLength);
  (void)original_size;  // Disable unused variable warning.
}

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index_handle()

const BlockHandle& leveldb::Footer::index_handle ( ) const

inline

Definition at line 56 of file format.h.

                                          {
    return index_handle_;
  }

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metaindex_handle()

const BlockHandle& leveldb::Footer::metaindex_handle ( ) const

inline

Definition at line 52 of file format.h.

{ return metaindex_handle_; }

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set_index_handle()

void leveldb::Footer::set_index_handle ( const BlockHandle &  h )

inline

Definition at line 59 of file format.h.

                                              {
    index_handle_ = h;
  }

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set_metaindex_handle()

void leveldb::Footer::set_metaindex_handle ( const BlockHandle &  h )

inline

Definition at line 53 of file format.h.

{ metaindex_handle_ = h; }

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Member Data Documentation

index_handle_

BlockHandle leveldb::Footer::index_handle_

private

Definition at line 75 of file format.h.

metaindex_handle_

BlockHandle leveldb::Footer::metaindex_handle_

private

Definition at line 74 of file format.h.

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The documentation for this class was generated from the following files:

• table/format.h
• table/format.cc