diff options
Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-crc32.ads')
-rw-r--r-- | gcc-4.2.1/gcc/ada/s-crc32.ads | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-crc32.ads b/gcc-4.2.1/gcc/ada/s-crc32.ads deleted file mode 100644 index 7f71abe7a..000000000 --- a/gcc-4.2.1/gcc/ada/s-crc32.ads +++ /dev/null @@ -1,83 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT LIBRARY COMPONENTS -- --- -- --- S Y S T E M . C R C 3 2 -- --- -- --- S p e c -- --- -- --- Copyright (C) 2001 Free Software Foundation, Inc. -- --- -- --- GNAT is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- --- for more details. You should have received a copy of the GNU General -- --- Public License distributed with GNAT; see file COPYING. If not, write -- --- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, USA. -- --- -- --- As a special exception, if other files instantiate generics from this -- --- unit, or you link this unit with other files to produce an executable, -- --- this unit does not by itself cause the resulting executable to be -- --- covered by the GNU General Public License. This exception does not -- --- however invalidate any other reasons why the executable file might be -- --- covered by the GNU Public License. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- Extensive contributions were provided by Ada Core Technologies Inc. -- --- -- ------------------------------------------------------------------------------- - --- This package provides routines for computing a commonly used checksum --- called CRC-32. This is a checksum based on treating the binary data --- as a polynomial over a binary field, and the exact specifications of --- the CRC-32 algorithm are as follows: --- --- Name : "CRC-32" --- Width : 32 --- Poly : 04C11DB7 --- Init : FFFFFFFF --- RefIn : True --- RefOut : True --- XorOut : FFFFFFFF --- Check : CBF43926 --- --- Note that this is the algorithm used by PKZip, Ethernet and FDDI. --- --- For more information about this algorithm see: --- --- ftp://ftp.rocksoft.com/papers/crc_v3.txt - --- "A Painless Guide to CRC Error Detection Algorithms", Ross N. Williams --- --- "Computation of Cyclic Redundancy Checks via Table Look-Up", Communications --- of the ACM, Vol. 31 No. 8, pp.1008-1013 Aug. 1988. Sarwate, D.V. - -with Interfaces; - -package System.CRC32 is - - type CRC32 is new Interfaces.Unsigned_32; - -- Used to represent CRC32 values, which are 32 bit bit-strings - - procedure Initialize (C : out CRC32); - pragma Inline (Initialize); - -- Initialize CRC value by assigning the standard Init value (16#FFFF_FFFF) - - procedure Update - (C : in out CRC32; - Value : Character); - pragma Inline (Update); - -- Evolve CRC by including the contribution from Character'Pos (Value) - - function Get_Value (C : CRC32) return Interfaces.Unsigned_32; - pragma Inline (Get_Value); - -- Get_Value computes the CRC32 value by performing an XOR with the - -- standard XorOut value (16#FFFF_FFFF). Note that this does not - -- change the value of C, so it may be used to retrieve intermediate - -- values of the CRC32 value during a sequence of Update calls. - -end System.CRC32; |