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greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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#include <stdio.h>
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greg |
1.2 |
#include "rasterfile.h"
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greg |
1.1 |
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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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int i;
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for (i = 1; i < argc; i++)
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fixfile(argv[i]);
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if (argc == 1)
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fixstream(stdin, stdout);
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exit(0);
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}
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fixfile(name)
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char *name;
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{
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struct rasterfile head;
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FILE *fp;
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if ((fp = fopen(name, "r+")) == NULL) {
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fprintf(stderr, "%s: cannon open for read/write\n", name);
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exit(1);
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}
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if (fread((char *)&head, sizeof(head), 1, fp) != 1) {
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fprintf(stderr, "%s: read error\n", name);
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exit(1);
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}
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swapbytes((char *)&head, sizeof(head), sizeof(int));
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if (fseek(fp, 0L, 0) == -1) {
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fprintf(stderr, "%s: seek error\n", name);
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exit(1);
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}
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if (fwrite((char *)&head, sizeof(head), 1, fp) != 1
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|| fclose(fp) == -1) {
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fprintf(stderr, "%s: write error\n", name);
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exit(1);
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}
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}
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fixstream(in, out)
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register FILE *in, *out;
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{
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struct rasterfile head;
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register int c;
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if (fread((char *)&head, sizeof(head), 1, in) != 1) {
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fprintf(stderr, "read error\n");
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exit(1);
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}
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swapbytes((char *)&head, sizeof(head), sizeof(int));
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fwrite((char *)&head, sizeof(head), 1, out);
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while ((c = getc(in)) != EOF)
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putc(c, out);
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if (ferror(out)) {
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fprintf(stderr, "write error\n");
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exit(1);
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}
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}
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swapbytes(top, size, width)
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char *top;
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int size, width;
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{
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register char *b, *e;
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register int c;
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for ( ; size > 0; size -= width, top += width) {
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b = top; e = top+width-1;
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while (b < e) {
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c = *e;
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*e-- = *b;
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*b++ = c;
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}
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}
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}
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