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author | Ian Lance Taylor <ian@gcc.gnu.org> | 2011-03-24 23:46:17 +0000 |
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committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2011-03-24 23:46:17 +0000 |
commit | 8039ca76a5705ae5052b20cee64110c32545c4fc (patch) | |
tree | 9319bca77115a32f6a0b5e8bcd651465b14c76da /libgo/go/big/nat.go | |
parent | 7114321ee4f521ea9fbdd08a4c23b361181f3658 (diff) | |
download | gcc-8039ca76a5705ae5052b20cee64110c32545c4fc.zip gcc-8039ca76a5705ae5052b20cee64110c32545c4fc.tar.gz gcc-8039ca76a5705ae5052b20cee64110c32545c4fc.tar.bz2 |
Update to current version of Go library.
From-SVN: r171427
Diffstat (limited to 'libgo/go/big/nat.go')
-rw-r--r-- | libgo/go/big/nat.go | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libgo/go/big/nat.go b/libgo/go/big/nat.go index a308f69..a04d3b1 100644 --- a/libgo/go/big/nat.go +++ b/libgo/go/big/nat.go @@ -1065,3 +1065,50 @@ NextRandom: return true } + + +// bytes writes the value of z into buf using big-endian encoding. +// len(buf) must be >= len(z)*_S. The value of z is encoded in the +// slice buf[i:]. The number i of unused bytes at the beginning of +// buf is returned as result. +func (z nat) bytes(buf []byte) (i int) { + i = len(buf) + for _, d := range z { + for j := 0; j < _S; j++ { + i-- + buf[i] = byte(d) + d >>= 8 + } + } + + for i < len(buf) && buf[i] == 0 { + i++ + } + + return +} + + +// setBytes interprets buf as the bytes of a big-endian unsigned +// integer, sets z to that value, and returns z. +func (z nat) setBytes(buf []byte) nat { + z = z.make((len(buf) + _S - 1) / _S) + + k := 0 + s := uint(0) + var d Word + for i := len(buf); i > 0; i-- { + d |= Word(buf[i-1]) << s + if s += 8; s == _S*8 { + z[k] = d + k++ + s = 0 + d = 0 + } + } + if k < len(z) { + z[k] = d + } + + return z.norm() +} |