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For DiscImageChef add an option to not deduplicate sectors.

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Natalia Portillo
2018-01-30 03:07:10 +00:00
parent 85b4b64b24
commit 21334af627
1 changed files with 23 additions and 5 deletions
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26
DiscImageChef.DiscImages/DiscImageChef.cs
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@@ -188,6 +188,7 @@ namespace DiscImageChef.DiscImages
/// <summary>In-memory deduplication table</summary>
ulong[] userDataDdt;
bool writingLong;
bool deduplicate;
public DiscImageChef()
{
@@ -1885,7 +1886,8 @@ namespace DiscImageChef.DiscImages
("md5", typeof(bool), "Calculate and store MD5 of image's user data"),
("sha1", typeof(bool), "Calculate and store SHA1 of image's user data"),
("sha256", typeof(bool), "Calculate and store SHA256 of image's user data"),
("spamsum", typeof(bool), "Calculate and store SpamSum of image's user data")
("spamsum", typeof(bool), "Calculate and store SpamSum of image's user data"),
("deduplicate", typeof(bool), "Store only unique sectors. This consumes more memory and is slower, but it's enabled by default")
};
public IEnumerable<string> KnownExtensions => new[] {".dicf"};
public bool IsWriting { get; private set; }
@@ -1973,6 +1975,16 @@ namespace DiscImageChef.DiscImages
}
}
else doSpamsum = false;
if(options.TryGetValue("spamsum", out tmpValue))
{
if(!bool.TryParse(tmpValue, out deduplicate))
{
ErrorMessage = "Invalid value for deduplicate option";
return false;
}
}
else deduplicate = true;
}
else
{
@@ -1983,6 +1995,7 @@ namespace DiscImageChef.DiscImages
doSha1 = false;
doSha256 = false;
doSpamsum = false;
deduplicate = true;
}
// This really, cannot happen
@@ -2608,11 +2621,15 @@ namespace DiscImageChef.DiscImages
lastWrittenBlock = sectorAddress;
}
byte[] hash = checksumProvider.ComputeHash(data);
if(sectorAddress == 0) alreadyWrittenZero = true;
if(deduplicationTable.TryGetValue(hash, out ulong pointer))
byte[] hash = null;
// Compute hash only if asked to deduplicate, or the sector is empty (those will always be deduplicated)
if(deduplicate || ArrayHelpers.ArrayIsNullOrEmpty(data))
hash = checksumProvider.ComputeHash(data);
if(hash != null && deduplicationTable.TryGetValue(hash, out ulong pointer))
{
SetDdtEntry(sectorAddress, pointer);
ErrorMessage = "";
@@ -2723,6 +2740,7 @@ namespace DiscImageChef.DiscImages
}
ulong ddtEntry = (ulong)((imageStream.Position << shift) + currentBlockOffset);
if(hash != null)
deduplicationTable.Add(hash, ddtEntry);
if(currentBlockHeader.compression == CompressionType.Flac)
{