33 lines
589 B
C
33 lines
589 B
C
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#include "os.h"
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#include <mp.h>
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#include "dat.h"
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// convert an mpint into a big endian byte array (most significant byte first; left adjusted)
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// return number of bytes converted
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// if p == nil, allocate and result array
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int
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mptobe(mpint *b, uint8_t *p, uint32_t n, uint8_t **pp)
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{
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int m;
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m = (mpsignif(b)+7)/8;
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if(m == 0)
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m++;
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if(p == nil){
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n = m;
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p = malloc(n);
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if(p == nil)
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sysfatal("mptobe: %r");
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setmalloctag(p, getcallerpc());
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} else {
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if(n < m)
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return -1;
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if(n > m)
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memset(p+m, 0, n-m);
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}
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if(pp != nil)
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*pp = p;
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mptober(b, p, m);
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return m;
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}
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