Class ContentHasher

Computes Dropbox API content hashes for file contents.

Inheritance

object

ContentHasher

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Dropbox.Api.Files

Assembly: Dropbox.Api.dll

Syntax

public static class ContentHasher

Remarks

Dropbox content hashes are computed by splitting content into 4 MiB blocks, hashing each block with SHA-256, concatenating those block hashes, and SHA-256 hashing the concatenation.

Fields

BlockSize

The number of bytes in each Dropbox content hash block.

Declaration

public const int BlockSize = 4194304

Field Value

Type	Description
int

Methods

ComputeHash(Stream)

Computes the Dropbox API content hash for the stream from its current position to the end of the stream.

Declaration

public static string ComputeHash(Stream content)

Parameters

Type	Name	Description
Stream	content	The content stream to hash.

Returns

Type	Description
string	The lowercase hexadecimal Dropbox API content hash.

ComputeHashAsync(Stream)

Computes the Dropbox API content hash for the stream from its current position to the end of the stream.

Declaration

public static Task<string> ComputeHashAsync(Stream content)

Parameters

Type	Name	Description
Stream	content	The content stream to hash.

Returns

Type	Description
Task<string>	The task that represents the asynchronous hash operation. The TResult parameter contains the lowercase hexadecimal Dropbox API content hash.

WithoutAutoContentHash(Stream)

Returns a stream wrapper that disables automatic SDK content hash population for upload requests.

Declaration

public static Stream WithoutAutoContentHash(Stream content)

Parameters

Type	Name	Description
Stream	content	The upload content stream.

Returns

Type	Description
Stream	A stream wrapper that disables automatic content hash population.

Remarks

A manually supplied ContentHash value on the upload argument is still sent. This wrapper delegates reads, seeking, and disposal to the wrapped stream.