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out of range panic fix #58

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out of range panic fix #58

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23 changes: 20 additions & 3 deletions unicode/norm/forminfo.go
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Original file line number Diff line number Diff line change
Expand Up @@ -256,12 +256,18 @@ func compInfo(v uint16, sz int) Properties {
return p
}
// has decomposition
h := decomps[v]
h, ok := decompsVal(v)
if !ok {
return Properties{size: uint8(sz)}
}
f := (qcInfo(h&headerFlagsMask) >> 2) | 0x4
p := Properties{size: uint8(sz), flags: f, index: v}
if v >= firstCCC {
v += uint16(h&headerLenMask) + 1
c := decomps[v]
c, ok := decompsVal(v)
if !ok {
return Properties{size: uint8(sz)}
}
p.tccc = c >> 2
p.flags |= qcInfo(c & 0x3)
if v >= firstLeadingCCC {
Expand All @@ -272,8 +278,19 @@ func compInfo(v uint16, sz int) Properties {
p.index = 0
return p
}
p.ccc = decomps[v+1]
ccc, ok := decompsVal(v + 1)
if !ok {
return Properties{size: uint8(sz)}
}
p.ccc = ccc
}
}
return p
}

func decompsVal(v uint16) (byte, bool) {
if int(v) >= len(decomps) {
return 0, false
}
return decomps[v], true
}