116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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File: CRCPatch.c
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Contains: Source to MPW tool that reads the code segment 1 from
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the resource file and calculates the CRC value. It then
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patches the file and saves it.
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Written by: George Norman - 7/30/86
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Copyright: © 1986, 1992 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<SM4> 12-04-92 jmp Fixed a 32-bit cleanliness problem and temporarily changed
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'decl' back to 'CODE' as I checked 3.2’s Linker into the
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project.
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<3> 3/31/92 JSM Rolled this file into Reality.
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<2> 2/20/92 kc Change resource type from 'CODE' to 'decl'.
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<1> 1/31/92 JSM first checked in
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*/
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#include <stdio.h>
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#include <types.h>
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#include <osutils.h>
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#include <files.h>
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#include <resources.h>
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#include <memory.h>
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#include <errno.h>
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pascal void debugger() extern 0xa9ff;
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pascal void _CalcCRC (SizeCode,CodePtr,crc)
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long SizeCode;
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Ptr CodePtr;
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long *crc;
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extern;
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/******************************************************************
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Main
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*******************************************************************/
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main(argc,argv)
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int argc;
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char *argv[];
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{
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short refnum;
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Handle CodeHandle; /* Handle to code resource */
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short IOR; /* IO Result */
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long SizeCode; /* Size of the code */
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Ptr CodePtr; /* Pointer to the code */
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long crc; /* the crc value */
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if (argc == 1)
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{
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fprintf(stderr,"### ERROR : No input file specified.\n");
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fprintf(stderr,"### SYNTAX: crcPatch filename\n");
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fprintf(stderr,"### DSCRPT: Calculate and patch the crc value to code segment 1.\n");
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}
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else if (argc != 2)
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{
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fprintf(stderr,"### ERROR : Wrong number of parameters specified.\n");
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fprintf(stderr,"### SYNTAX: crcPatch filename\n");
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fprintf(stderr,"### DSCRPT: Calculate and patch the crc value to code segment 1.\n");
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}
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else
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{
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refnum = openresfile(argv[1]);
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if (refnum < 0 )
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fprintf(stderr,"### ERROR : Resource file: %s can't be opened. err = %d.\n",argv[1],refnum);
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else
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{
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CodeHandle = Get1Resource('CODE',1);
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if (CodeHandle == nil)
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fprintf(stderr,"### ERROR : Code resource not available. Err = %d\n",errno);
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else
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{
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LoadResource(CodeHandle); // Make sure the resource is loaded.
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HNoPurge(CodeHandle); // Make sure it stays loaded.
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HLock(CodeHandle); // Make sure it doesn’t move.
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// Originally, this code subtracted 4 from SizeCode and added 4 to CodePtr
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// due to the fact that the Linker would automatically put in space for a
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// 'CODE' resource’s jump table. With the 3.2 Linker, this is no longer done
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// when the -rt option is specified.
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//
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SizeCode = GetHandleSize(CodeHandle);
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CodePtr = (Ptr)(*CodeHandle);
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_CalcCRC(SizeCode,CodePtr,&crc); /* Calc and patch the crc value */
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ChangedResource(CodeHandle);
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IOR = ResError();
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if (IOR != 0)
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fprintf(stderr,"### ERROR : ChangedResource. Err = %d\n",IOR);
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WriteResource(CodeHandle);
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IOR = ResError();
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if (IOR != 0)
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fprintf(stderr,"### ERROR : WriteResource. Err = %d\n",IOR);
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CloseResFile(refnum);
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IOR = ResError();
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if (IOR != 0)
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fprintf(stderr,"### ERROR : CloseResFile. Err = %d\n",IOR);
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}
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}
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}
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}
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