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<pre class="sourcecodebox">////////////// File: EndianUtilities.c//// Contains: Utilities for managing the endian differences between operating systems.//// Written by: Tim Monroe// Based on existing endian functions by various QT engineers.//// Copyright: © 1998 by Apple Computer, Inc., all rights reserved.//// Change History (most recent first)://// <1> 03/27/98 rtm first file////////////#ifndef __ENDIANUTILITIES__#include "EndianUtilities.h"#endif////////////// prototypes////////////static void EndianUtils_FlipImageDescription (Boolean theNtoB, ImageDescriptionHandle theIDH);////////////// EndianUtils_FlipImageDescription// Convert an image description to big- or native-endian format.////////////static void EndianUtils_FlipImageDescription (Boolean theNtoB, ImageDescriptionHandle theIDH){ (**theIDH).idSize = EndianU32_NtoB((**theIDH).idSize); (**theIDH).cType = EndianU32_NtoB((**theIDH).cType); (**theIDH).resvd1 = EndianU32_NtoB((**theIDH).resvd1); (**theIDH).resvd2 = EndianU16_NtoB((**theIDH).resvd2); (**theIDH).dataRefIndex = EndianU16_NtoB((**theIDH).dataRefIndex); (**theIDH).version = EndianU16_NtoB((**theIDH).version); (**theIDH).revisionLevel = EndianU16_NtoB((**theIDH).revisionLevel); (**theIDH).vendor = EndianU32_NtoB((**theIDH).vendor); (**theIDH).temporalQuality = EndianU32_NtoB((**theIDH).temporalQuality); (**theIDH).spatialQuality = EndianU32_NtoB((**theIDH).spatialQuality); (**theIDH).width = EndianU16_NtoB((**theIDH).width); (**theIDH).height = EndianU16_NtoB((**theIDH).height); (**theIDH).hRes = EndianU32_NtoB((**theIDH).hRes); (**theIDH).vRes = EndianU32_NtoB((**theIDH).vRes); (**theIDH).dataSize = EndianU32_NtoB((**theIDH).dataSize); (**theIDH).frameCount = EndianU16_NtoB((**theIDH).frameCount); (**theIDH).depth = EndianU16_NtoB((**theIDH).depth); (**theIDH).clutID = EndianU16_NtoB((**theIDH).clutID); if ((**theIDH).clutID == 0 ) { ImDesc **myHandle = (ImDesc **)theIDH; short i; // make sure there really is a color table following the image description if (GetHandleSize((Handle)theIDH) == sizeof(ImageDescription)) { (**theIDH).clutID = -1; } else { short ctSize = (**myHandle).ct.ctSize; if (!theNtoB) // not already native endian ctSize = EndianS16_NtoB(ctSize); (**myHandle).ct.ctSeed = EndianU16_NtoB((**myHandle).ct.ctSeed); (**myHandle).ct.ctSize = EndianU16_NtoB((**myHandle).ct.ctSize); (**myHandle).ct.ctFlags = EndianU16_NtoB((**myHandle).ct.ctFlags); for (i = 0; i < ctSize + 1; i++) { (**myHandle).ct.ctTable[i].value = EndianU16_NtoB((**myHandle).ct.ctTable[i].value); (**myHandle).ct.ctTable[i].rgb.red = EndianU16_NtoB((**myHandle).ct.ctTable[i].rgb.red); (**myHandle).ct.ctTable[i].rgb.green = EndianU16_NtoB((**myHandle).ct.ctTable[i].rgb.green); (**myHandle).ct.ctTable[i].rgb.blue = EndianU16_NtoB((**myHandle).ct.ctTable[i].rgb.blue); } } }}////////////// EndianUtils_ImageDescription_NtoB// Convert an image description to big-endian format.////////////void EndianUtils_ImageDescription_NtoB (ImageDescriptionHandle theIDH){ EndianUtils_FlipImageDescription(kNtoB, theIDH);}////////////// EndianUtils_ImageDescription_BtoN// Convert an image description from big- to native-endian format.////////////void EndianUtils_ImageDescription_BtoN (ImageDescriptionHandle theIDH){ EndianUtils_FlipImageDescription(kBtoN, theIDH);}////////////// EndianUtils_MatrixRecord_NtoB// Convert a matrix record to big-endian format.////////////void EndianUtils_MatrixRecord_NtoB (MatrixRecord *theMatrix){#if TARGET_RT_LITTLE_ENDIAN int i, j; for (i = 0; i < 3; i++) for (j = 0; j < 3; j++) theMatrix->matrix[j][i] = EndianS32_NtoB(theMatrix->matrix[j][i]);#endif}////////////// EndianUtils_RgnHandle_NtoB// Convert a region handle to big-endian format.//// We know that a region consists of a size, followed by a Rect, followed possibly by a stream of SInt16s,// so we can just flip size of region/sizeof(SInt16) SInt16s from native- to big-endian format.////////////void EndianUtils_RgnHandle_NtoB (RgnHandle theRgn){#if TARGET_RT_LITTLE_ENDIAN short mySize; SInt16 *mySInt16Ptr; if (theRgn && *theRgn) { HLock((Handle)theRgn); mySize = (**((short **)theRgn))/2; for (mySInt16Ptr = (SInt16*)*theRgn; mySize > 0; mySize--, mySInt16Ptr++) *mySInt16Ptr = EndianU16_NtoB(*mySInt16Ptr); HUnlock((Handle)theRgn); }#endif}////////////// EndianUtils_Float_NtoB// Convert a floating-point value to big-endian format.////////////void EndianUtils_Float_NtoB (float *theFloat){#if TARGET_RT_LITTLE_ENDIAN unsigned long *myLongPtr; myLongPtr = (unsigned long *)theFloat; *myLongPtr = EndianU32_NtoB(*myLongPtr);#endif}</pre>
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