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29 lines
733 B
29 lines
733 B
15 years ago
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#include <resolv.h>
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#include <string.h>
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#define BITOP(a,b,op) \
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((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
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int dn_expand(unsigned char *b, unsigned char *pz, unsigned char *p, unsigned char *s, int outlen)
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{
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/* Remember jump destinations to detect loops and abort */
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size_t seen[512/8/sizeof(size_t)] = { 0 };
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unsigned char *sz = s + outlen;
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if (pz-b > 512) return -1;
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for (;;) {
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if (p>=pz) return -1;
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else if (*p&0xc0) {
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int j = (p[0]&1) | p[1];
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if (BITOP(seen, j, &)) return -1;
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BITOP(seen, j, |=);
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p = b + j;
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} else if (*p) {
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if (p+*p+1>=pz || s+*p>=sz) return -1;
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memcpy(s, p+1, *p);
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s += *p+1;
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p += *p+1;
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s[-1] = *p ? '.' : 0;
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} else return 0;
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}
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}
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