QuickHash Library

API

CRC32 API Overview

CRC32 API assists you in generating CRC32 checksums.

CRC32 checksums can be generated in two modes: accumulative and non-accumulative.

The accumulative mode is applied when the data for which the checksum is calculated (data) represents one or more continuous memory block(s) or when the data is created at runtime in many steps (for instance, when reading a file).

Non-accumulative mode can be applied when the data represents only one continuous memory block.

Note. When the data represents just one continuous memory block, both methods can be applied.

To generate the checksum in the accumulative mode, perform the following:

• Allocate at least SLC_CRC32_CONTEXTSIZE bytes for the context.

• Call the SL_CRC32_Init function to initialize the context.

• Call the SL_CRC32_Update function for each continuous memory block of data to perform the calculations.

Note. You can use SL_CRC32_UpdateStr function (instead of SL_CRC32_Update function) if the data represents a null-terminated string.

• Call the SL_CRC32_Final or the SL_CRC32_FinalHex function to obtain the checksum.

Note. Call the SL_CRC32_FinalHex function when you need to retrieve the hexadecimal string representation of the checksum.

To generate the checksum in the non-accumulative mode, perform the following:

• Call the SL_CRC32_Calculate or the SL_CRC32_CalculateHex function to calculate and retrieve the checksum.

Note 1. Call the SL_CRC32_CalculateHex function when you need to retrieve the hexadecimal string representation of the checksum.

Note 2. You can use SL_CRC32_CalculateStr and SL_CRC32_CalculateStrHex functions (instead of SL_CRC32_Calculate and SL_CRC32_CalculateHex functions) if the data represents a null-terminated string.

CRC32 API Functions   |   Useful Links   |   HashCalc

Samples   CRC32 checksum generation for a file

               CRC32 checksum generation for a string