public bool CheckFileExists(string path)
{
if (File.Exists(path))
{
return(true);
}
try {
_chunkDbService.GetManagedFile(path);
} catch (ChunkDbException ex) {
return(false);
}
return(true);
}
public ChunkMapDto BuildChunkMapDto()
{
ManagedFile file = _chunkDbService.GetManagedFile(DataFilePath);
int totalChunkNumber = (int)(file.Size / DataChunk.ChunkSize);
logger.DebugFormat("Total number of chunk for this file: {0}.",
totalChunkNumber);
AccessProfile[] chunkStatsArr = GetChunksOrderedByEarliestRead();
logger.DebugFormat("Brought in totally {0} chunks from profile.",
chunkStatsArr.Length);
// The hashes have two parts: in the profile and out of the profile.
int[] fileIndices = new int[totalChunkNumber];
byte[] hashes = new byte[totalChunkNumber * DataChunk.HashSize];
HashSet <int> indicesSet = new HashSet <int>();
// Number of chunks read directly from file instead of pulled from DB.
int numDirectRead = 0;
int fileIndicesCur = 0;
for (; fileIndicesCur < chunkStatsArr.Length; fileIndicesCur++)
{
var chunk = chunkStatsArr[fileIndicesCur];
fileIndices[fileIndicesCur] = chunk.ChunkIndex;
indicesSet.Add(chunk.ChunkIndex);
bool readFile;
byte[] hash = _fileHelper.GetHashFromChunkDbOrFile(DataFilePath,
chunk.ChunkIndex, out readFile);
if (readFile)
{
numDirectRead++;
}
Buffer.BlockCopy(hash, 0, hashes, fileIndicesCur * DataChunk.HashSize, hash.Length);
}
int inProfileChunkNum = fileIndicesCur;
logger.DebugFormat("Finished adding {0} in the profile chunks.", inProfileChunkNum);
// Begin handling out of the profile chunks.
for (int i = 0; i < totalChunkNumber; i++)
{
if (!indicesSet.Contains(i))
{
// This chunk is not in the profile
fileIndices[fileIndicesCur] = i;
bool readFile;
byte[] hash = _fileHelper.GetHashFromChunkDbOrFile(DataFilePath,
i, out readFile);
if (readFile)
{
numDirectRead++;
}
Buffer.BlockCopy(hash, 0, hashes, fileIndicesCur * DataChunk.HashSize, hash.Length);
fileIndicesCur++;
}
}
logger.DebugFormat("Finished adding {0} out of profile chunks.",
fileIndicesCur - inProfileChunkNum);
logger.DebugFormat(
"There are {0} chunks in total read directly from file.",
numDirectRead);
return(new ChunkMapDto {
Hashes = hashes,
FileIndices = fileIndices
});
}
