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authorChris Wilson <chris+github@qwirx.com>2011-04-26 18:44:26 +0000
committerChris Wilson <chris+github@qwirx.com>2011-04-26 18:44:26 +0000
commit1fe4e9308b8f50dbe70cc69bd500eb829a11b460 (patch)
tree738a016038b1bfbca588f688938d0d34fc55c06a /lib/backupstore/BackupStoreFileEncodeStream.h
parent848ec8ab81adfa1c8d10e87c047c9db3ec6654b4 (diff)
Major refactoring to make lib/backupclient depend on lib/backupstore rather
than the other way around. This is needed to allow clients to have all the code that they'd need to implement local backups (using the Local protocol) in subsequent commits.
Diffstat (limited to 'lib/backupstore/BackupStoreFileEncodeStream.h')
-rw-r--r--lib/backupstore/BackupStoreFileEncodeStream.h137
1 files changed, 137 insertions, 0 deletions
diff --git a/lib/backupstore/BackupStoreFileEncodeStream.h b/lib/backupstore/BackupStoreFileEncodeStream.h
new file mode 100644
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+++ b/lib/backupstore/BackupStoreFileEncodeStream.h
@@ -0,0 +1,137 @@
+// --------------------------------------------------------------------------
+//
+// File
+// Name: BackupStoreFileEncodeStream.h
+// Purpose: Implement stream-based file encoding for the backup store
+// Created: 12/1/04
+//
+// --------------------------------------------------------------------------
+
+#ifndef BACKUPSTOREFILEENCODESTREAM__H
+#define BACKUPSTOREFILEENCODESTREAM__H
+
+#include <vector>
+
+#include "IOStream.h"
+#include "BackupStoreFilename.h"
+#include "CollectInBufferStream.h"
+#include "MD5Digest.h"
+#include "BackupStoreFile.h"
+#include "ReadLoggingStream.h"
+#include "RunStatusProvider.h"
+
+namespace BackupStoreFileCreation
+{
+ // Diffing and creation of files share some implementation details.
+ typedef struct _BlocksAvailableEntry
+ {
+ struct _BlocksAvailableEntry *mpNextInHashList;
+ int32_t mSize; // size in clear
+ uint32_t mWeakChecksum; // weak, rolling checksum
+ uint8_t mStrongChecksum[MD5Digest::DigestLength]; // strong digest based checksum
+ } BlocksAvailableEntry;
+
+}
+
+
+// --------------------------------------------------------------------------
+//
+// Class
+// Name: BackupStoreFileEncodeStream
+// Purpose: Encode a file into a stream
+// Created: 8/12/03
+//
+// --------------------------------------------------------------------------
+class BackupStoreFileEncodeStream : public IOStream
+{
+public:
+ BackupStoreFileEncodeStream();
+ ~BackupStoreFileEncodeStream();
+
+ typedef struct
+ {
+ int64_t mSpaceBefore; // amount of bytes which aren't taken out of blocks which go
+ int32_t mBlocks; // number of block to reuse, starting at this one
+ BackupStoreFileCreation::BlocksAvailableEntry *mpStartBlock; // may be null
+ } RecipeInstruction;
+
+ class Recipe : public std::vector<RecipeInstruction>
+ {
+ // NOTE: This class is rather tied in with the implementation of diffing.
+ public:
+ Recipe(BackupStoreFileCreation::BlocksAvailableEntry *pBlockIndex, int64_t NumBlocksInIndex,
+ int64_t OtherFileID = 0);
+ ~Recipe();
+
+ int64_t GetOtherFileID() {return mOtherFileID;}
+ int64_t BlockPtrToIndex(BackupStoreFileCreation::BlocksAvailableEntry *pBlock)
+ {
+ return pBlock - mpBlockIndex;
+ }
+
+ private:
+ BackupStoreFileCreation::BlocksAvailableEntry *mpBlockIndex;
+ int64_t mNumBlocksInIndex;
+ int64_t mOtherFileID;
+ };
+
+ void Setup(const char *Filename, Recipe *pRecipe, int64_t ContainerID,
+ const BackupStoreFilename &rStoreFilename,
+ int64_t *pModificationTime,
+ ReadLoggingStream::Logger* pLogger = NULL,
+ RunStatusProvider* pRunStatusProvider = NULL);
+
+ virtual int Read(void *pBuffer, int NBytes, int Timeout);
+ virtual void Write(const void *pBuffer, int NBytes);
+ virtual bool StreamDataLeft();
+ virtual bool StreamClosed();
+ int64_t GetTotalBytesSent() { return mTotalBytesSent; }
+
+private:
+ enum
+ {
+ Status_Header = 0,
+ Status_Blocks = 1,
+ Status_BlockListing = 2,
+ Status_Finished = 3
+ };
+
+private:
+ void EncodeCurrentBlock();
+ void CalculateBlockSizes(int64_t DataSize, int64_t &rNumBlocksOut, int32_t &rBlockSizeOut, int32_t &rLastBlockSizeOut);
+ void SkipPreviousBlocksInInstruction();
+ void SetForInstruction();
+ void StoreBlockIndexEntry(int64_t WncSizeOrBlkIndex, int32_t ClearSize, uint32_t WeakChecksum, uint8_t *pStrongChecksum);
+
+private:
+ Recipe *mpRecipe;
+ IOStream *mpFile; // source file
+ CollectInBufferStream mData; // buffer for header and index entries
+ IOStream *mpLogging;
+ RunStatusProvider* mpRunStatusProvider;
+ int mStatus;
+ bool mSendData; // true if there's file data to send (ie not a symlink)
+ int64_t mTotalBlocks; // Total number of blocks in the file
+ int64_t mAbsoluteBlockNumber; // The absolute block number currently being output
+ // Instruction number
+ int64_t mInstructionNumber;
+ // All the below are within the current instruction
+ int64_t mNumBlocks; // number of blocks. Last one will be a different size to the rest in most cases
+ int64_t mCurrentBlock;
+ int32_t mCurrentBlockEncodedSize;
+ int32_t mPositionInCurrentBlock; // for reading out
+ int32_t mBlockSize; // Basic block size of most of the blocks in the file
+ int32_t mLastBlockSize; // the size (unencoded) of the last block in the file
+ int64_t mTotalBytesSent;
+ // Buffers
+ uint8_t *mpRawBuffer; // buffer for raw data
+ BackupStoreFile::EncodingBuffer mEncodedBuffer;
+ // buffer for encoded data
+ int32_t mAllocatedBufferSize; // size of above two allocated blocks
+ uint64_t mEntryIVBase; // base for block entry IV
+};
+
+
+
+#endif // BACKUPSTOREFILEENCODESTREAM__H
+