sComputeCrc32 (Function)

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sComputeCrc16 (Function)

sComputeCrc32 (Function)

In french: sCalculeCrc32

Calculates the Cyclical Redundancy Check (CRC) of buffer.

Remark: CRC is comparable to a stamp signature. Any modification made to the buffer changes the CRC value. The use of CRC allows you to detect the possible file modifications during a transfer via network. You can compare the CRC of the file before and after transmission. If they are identical, the file was probably not modified during the transfer.

Example

// Calcule le CRC d'une chaîne
CRC is int
CRC = sComputeCrc32(MaChaîne)

// Transmet la chaîne et le CRC

// Vérification de l'intégrité de la chaîne
IF sComputeCrc32(MaChaîne) <> CRC THEN Info("Chaîne modifiée")

Syntax

<Result> = sComputeCrc32(<Buffer> [, <Partial CRC>])

<Result>: Integer

Control value of string (CRC)

<Buffer>: Buffer or character string

String or buffer used to calculate the control value (CRC)

<Partial CRC>: Optional integer

Result of a previous CRC calculation. This parameter is used to calculate the CRC of two consecutive buffers: it is not necessary to concatenate the buffers. This parameter corresponds to 0 (a single buffer is managed) by default.
This parameter is ignored. A single buffer is managed.

Remarks

sComputeCrc32 is identical to sComputeCrc16, but it is faster and more efficient.

Business / UI classification: Business Logic

Component: wd300std.dll