jburkardt

CRC\ PNG Cyclic Redundancy Checksum {#crc-png-cyclic-redundancy-checksum align=”center”} ==============================

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CRC is a C++ library which computes the PNG CRC (cyclic redundancy checksum) for a string of bytes.

PNG is the Portable Network Graphics format. The PNG checksum algorithm is used as part of the encoding of a PNG file.

Languages: {#languages align=”center”}

CRC is available in a C++ version.

Related Data and Programs: {#related-data-and-programs align=”center”}

PNG, a data directory which contains examples of Portable Network Graphics (PNG) files, 2D graphics;

Reference: {#reference align=”center”}

1. World Wide Web Consortium,\ Portable Network Graphics (PNG) Specification,\ Second edition, 10 November 2003.

Source Code: {#source-code align=”center”}

• crc.cpp, the source code;
• crc.hpp, the include file;

Examples and Tests: {#examples-and-tests align=”center”}

• crc_prb.cpp, the calling program;
• crc_prb_output.txt, the sample output.

List of Routines: {#list-of-routines align=”center”}

• CRC returns the CRC of the bytes in BUF[0…LEN-1].
• MAKE_CRC_TABLE makes the table for a fast CRC computation.
• PRINT_CRC_TABLE prints the CRC table.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• UPDATE_CRC_C updates a running CRC with one more character.
• UPDATE_CRC_S updates a running CRC with a new string of characters.

You can go up one level to the C++ source codes.

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Last revised on 30 December 2007.