76 lines
1.1 KiB
C
76 lines
1.1 KiB
C
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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# include "FP_types.h"
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void
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b64_sft(e1,n)
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B64 *e1;
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int n;
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{
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if (n > 0) {
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if (n > 63) {
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e1->l_32 = 0;
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e1->h_32 = 0;
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return;
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}
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if (n >= 32) {
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e1->l_32 = e1->h_32;
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e1->h_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e1->l_32 >>= n;
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if (e1->h_32 != 0) {
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e1->l_32 |= (e1->h_32 << (32 - n));
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e1->h_32 >>= n;
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}
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}
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return;
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}
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n = -n;
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if (n > 0) {
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if (n > 63) {
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e1->l_32 = 0;
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e1->h_32 = 0;
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return;
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}
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if (n >= 32) {
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e1->h_32 = e1->l_32;
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e1->l_32 = 0;
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n -= 32;
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}
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if (n > 0) {
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e1->h_32 <<= n;
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if (e1->l_32 != 0) {
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e1->h_32 |= (e1->l_32 >> (32 - n));
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e1->l_32 <<= n;
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}
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}
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}
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}
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void
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b64_lsft(e1)
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B64 *e1;
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{
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/* shift left 1 bit */
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e1->h_32 <<= 1;
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if (e1->l_32 & 0x80000000L) e1->h_32 |= 1;
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e1->l_32 <<= 1;
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}
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void
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b64_rsft(e1)
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B64 *e1;
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{
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/* shift right 1 bit */
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e1->l_32 >>= 1;
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if (e1->h_32 & 1) e1->l_32 |= 0x80000000L;
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e1->h_32 >>= 1;
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}
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