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u3: rewrites u3r_mug_words, correct for arbitrary input

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This commit is contained in:
Joe Bryan 2020-06-06 16:51:21 -07:00
parent 2c5a1adea3
commit 9e305da03c
1 changed files with 21 additions and 5 deletions
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26
pkg/urbit/noun/retrieve.c
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@ -1405,14 +1405,30 @@ u3r_mug_string(const c3_c *a_c)
c3_w c3_w
u3r_mug_words(const c3_w* key_w, c3_w len_w) u3r_mug_words(const c3_w* key_w, c3_w len_w)
{ {
c3_w byt_w = 0; c3_w byt_w;
c3_w wor_w;
while ( 0 < len_w ) { // ignore trailing zeros
wor_w = key_w[--len_w]; //
byt_w += _(u3a_is_cat(wor_w)) ? u3r_met(3, wor_w) : 4; while ( len_w && !key_w[len_w - 1] ) {
len_w--;
} }
// calculate byte-width a la u3r_met(3, ...)
//
if ( !len_w ) {
byt_w = 0;
}
else {
c3_w gal_w = len_w - 1;
c3_w daz_w = key_w[gal_w];
byt_w = (gal_w << 2)
+ ((daz_w >> 24) ? 4 : (daz_w >> 16) ? 3 : (daz_w >> 8) ? 2 : 1);
}
// XX: assumes little-endian
//
return u3r_mug_bytes((c3_y*)key_w, byt_w); return u3r_mug_bytes((c3_y*)key_w, byt_w);
} }