1 files changed, 125 insertions, 0 deletions
diff --git a/app/wlib/mswlib/mswchksm.c b/app/wlib/mswlib/mswchksm.c
new file mode 100644
index 0000000..602c204
--- /dev/null
+++ b/app/wlib/mswlib/mswchksm.c
@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <sys/stat.h>
+#include "../include/wlib.h"
+#ifdef WINDOWS
+#include <windows.h>
+#include "mswint.h"
+#endif
+
+#define HEWHDROFFSET	(0x3C)
+
+static FILE * openfile( const char * fn, const char * mode, long * fileSize )
+{
+	unsigned short PageCnt;
+	long FileSize;
+	FILE *fp;
+	struct stat Stat;
+	fp = fopen( fn, mode );
+	if (fp == NULL) {
+		perror( "fopen" );
+		return NULL;
+	}
+	fread( &PageCnt, sizeof(PageCnt), 1, fp ); /* Read past signature */
+	fread( &PageCnt, sizeof(PageCnt), 1, fp ); /* Read past pagesize */
+	FileSize = PageCnt;
+	fread( &PageCnt, sizeof(PageCnt), 1, fp ); /* Read past pagesize */
+	if ( FileSize == 0L )
+		FileSize = PageCnt * 512L;
+	else
+		FileSize += (PageCnt - 1) * 512L;
+	*fileSize = FileSize;
+	stat( fn, &Stat );
+	*fileSize = (long)Stat.st_size;
+	fprintf( stderr, "size1 = %ld, size2 = %ld\n", FileSize, (long)Stat.st_size );
+	return fp;
+}
+
+
+static unsigned short mswCheck16( FILE * fp, long FileSize, unsigned short * sum16stored )
+{
+	unsigned short int sum16, NxtInt;
+	long x;
+	unsigned char NxtChar;
+	sum16 = 0;
+	fseek(fp, 0, SEEK_SET);
+
+	for (x=0L; x<FileSize/2L; x++) {
+		fread( &NxtInt, sizeof NxtInt, 1, fp );
+		if (x == 9)
+			*sum16stored = NxtInt;
+		else
+			sum16 += NxtInt;
+	}
+	if (FileSize%2) {
+		fread( &NxtChar, sizeof NxtChar, 1, fp );
+		sum16 += (unsigned int)NxtChar;
+	}
+	return sum16;
+}
+
+
+static int mswCheck32( FILE * fp, long FileSize, long * sum32off, unsigned long * sum32computed, unsigned long * sum32stored )
+{
+	unsigned long sum32, NxtLong;
+	long x;
+	long NewHdrOffset;
+	unsigned char NxtByte, y;
+
+	fseek( fp, HEWHDROFFSET, SEEK_SET );
+	fread( &NewHdrOffset, sizeof NewHdrOffset, 1, fp );
+	if (NewHdrOffset == 0) {
+		fprintf( stderr, "NewHdrOffset == 0\n" );
+		return 0;
+	}
+	NewHdrOffset = (NewHdrOffset/4)*4;
+	*sum32off = NewHdrOffset + 8;
+	sum32 = 0L;
+	fseek( fp, 0, SEEK_SET );
+	for (x = ( NewHdrOffset + 8 ) / 4; x; x-- ) {
+		fread( &NxtLong, sizeof NxtLong, 1, fp );
+		sum32 += NxtLong;
+	}
+	fread( sum32stored, sizeof sum32stored, 1, fp );
+
+	for (x=0; x<(FileSize-NewHdrOffset - 12)/4; x++) {
+		fread( &NxtLong, sizeof NxtLong, 1, fp );
+		sum32 += NxtLong;
+	}
+	if ( 0L != (x=FileSize%4L) ) {
+		NxtLong = 0L;
+		for (y=0; y<x; y++ ) {
+			fread( &NxtByte, sizeof NxtByte, 1, fp );
+			NxtLong += (unsigned long)NxtByte << (8*y);
+		}
+		sum32 += NxtLong;
+	}
+	*sum32computed = sum32;
+	return 1;
+}
+
+
+#ifdef WINDOWS
+wBool_t wCheckExecutable( void )
+{
+	char fileName[1024];
+	FILE * fp;
+	long FileSize;
+	GetModuleFileName( mswHInst, fileName, sizeof fileName );
+	fp = openfile( fileName, "rb", &FileSize );
+#ifdef LATER
+	{
+		unsigned long int sum32offset, sum32computed, sum32stored;
+		if ( ! mswCheck32( fp, FileSize, &sum32offset, &sum32computed, &sum32stored ) )
+			return FALSE;
+		return sum32computed == sum32stored;
+	}
+#else
+	{
+		unsigned short int sum16computed, sum16stored;
+		sum16computed = mswCheck16( fp, FileSize, &sum16stored );
+		sum16computed += sum16stored;
+		return sum16computed == 0xFFFF;
+	}
+#endif
+}
+#endif