ieeefloat.h
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上传日期:2007-02-02
资源大小:6116k
文件大小:3k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- #ifndef IEEE_FLOAT_H__
- #define IEEE_FLOAT_H__
- /* Copyright (C) 1988-1991 Apple Computer, Inc.
- * All Rights Reserved.
- *
- * Warranty Information
- * Even though Apple has reviewed this software, Apple makes no warranty
- * or representation, either express or implied, with respect to this
- * software, its quality, accuracy, merchantability, or fitness for a
- * particular purpose. As a result, this software is provided "as is,"
- * and you, its user, are assuming the entire risk as to its quality
- * and accuracy.
- *
- * This code may be used and freely distributed as long as it includes
- * this copyright notice and the warranty information.
- *
- * Machine-independent I/O routines for IEEE floating-point numbers.
- *
- * NaN's and infinities are converted to HUGE_VAL or HUGE, which
- * happens to be infinity on IEEE machines. Unfortunately, it is
- * impossible to preserve NaN's in a machine-independent way.
- * Infinities are, however, preserved on IEEE machines.
- *
- * These routines have been tested on the following machines:
- * Apple Macintosh, MPW 3.1 C compiler
- * Apple Macintosh, THINK C compiler
- * Silicon Graphics IRIS, MIPS compiler
- * Cray X/MP and Y/MP
- * Digital Equipment VAX
- * Sequent Balance (Multiprocesor 386)
- * NeXT
- *
- *
- * Implemented by Malcolm Slaney and Ken Turkowski.
- *
- * Malcolm Slaney contributions during 1988-1990 include big- and little-
- * endian file I/O, conversion to and from Motorola's extended 80-bit
- * floating-point format, and conversions to and from IEEE single-
- * precision floating-point format.
- *
- * In 1991, Ken Turkowski implemented the conversions to and from
- * IEEE double-precision format, added more precision to the extended
- * conversions, and accommodated conversions involving +/- infinity,
- * NaN's, and denormalized numbers.
- *
- * $Id: ieeefloat.h,v 1.2 2001/06/01 22:26:00 wmay Exp $
- *
- * Revision 1.1.1.1 1999/11/24 08:42:58 markt
- * initial checkin of LAME
- * Starting with LAME 3.57beta with some modifications
- *
- * Revision 1.1 1993/06/11 17:45:46 malcolm
- * Initial revision
- *
- */
- #include <math.h>
- typedef float Single;
- #ifndef applec
- typedef double defdouble;
- #else /* !applec */
- typedef long double defdouble;
- #endif /* applec */
- #ifndef THINK_C
- typedef double Double;
- #else /* THINK_C */
- typedef short double Double;
- #endif /* THINK_C */
- #define kFloatLength 4
- #define kDoubleLength 8
- #define kExtendedLength 10
- extern defdouble ConvertFromIeeeSingle(char *bytes);
- extern void ConvertToIeeeSingle(defdouble num, char *bytes);
- extern defdouble ConvertFromIeeeDouble(char *bytes);
- extern void ConvertToIeeeDouble(defdouble num, char *bytes);
- extern defdouble ConvertFromIeeeExtended(char *bytes);
- extern void ConvertToIeeeExtended(defdouble num, char *bytes);
- #endif