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authorPéter Szilágyi <peterke@gmail.com>2016-09-06 00:07:57 +0800
committerPéter Szilágyi <peterke@gmail.com>2016-11-14 23:56:58 +0800
commit178da7c6a94718389e7192d87df5ee42e7223bc3 (patch)
tree010f49656b5d1656cf24a4ff9bac35788dd9959f /mobile/big.go
parentd89ea3e6f90c32a97bad58b82a15af0d81f4250e (diff)
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mobile: initial wrappers for mobile support
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+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Contains all the wrappers from the math/big package.
+
+package geth
+
+import (
+ "errors"
+ "math/big"
+)
+
+// A BigInt represents a signed multi-precision integer.
+type BigInt struct {
+ bigint *big.Int
+}
+
+// NewBigInt allocates and returns a new BigInt set to x.
+func NewBigInt(x int64) *BigInt {
+ return &BigInt{big.NewInt(x)}
+}
+
+// GetBytes returns the absolute value of x as a big-endian byte slice.
+func (bi *BigInt) GetBytes() []byte {
+ return bi.bigint.Bytes()
+}
+
+// String returns the value of x as a formatted decimal string.
+func (bi *BigInt) String() string {
+ return bi.bigint.String()
+}
+
+// GetInt64 returns the int64 representation of x. If x cannot be represented in
+// an int64, the result is undefined.
+func (bi *BigInt) GetInt64() int64 {
+ return bi.bigint.Int64()
+}
+
+// SetBytes interprets buf as the bytes of a big-endian unsigned integer and sets
+// the big int to that value.
+func (bi *BigInt) SetBytes(buf []byte) {
+ bi.bigint.SetBytes(buf)
+}
+
+// SetInt64 sets the big int to x.
+func (bi *BigInt) SetInt64(x int64) {
+ bi.bigint.SetInt64(x)
+}
+
+// SetString sets the big int to x.
+//
+// The string prefix determines the actual conversion base. A prefix of "0x" or
+// "0X" selects base 16; the "0" prefix selects base 8, and a "0b" or "0B" prefix
+// selects base 2. Otherwise the selected base is 10.
+func (bi *BigInt) SetString(x string, base int) {
+ bi.bigint.SetString(x, base)
+}
+
+// BigInts represents a slice of big ints.
+type BigInts struct{ bigints []*big.Int }
+
+// Size returns the number of big ints in the slice.
+func (bi *BigInts) Size() int {
+ return len(bi.bigints)
+}
+
+// Get returns the bigint at the given index from the slice.
+func (bi *BigInts) Get(index int) (*BigInt, error) {
+ if index < 0 || index >= len(bi.bigints) {
+ return nil, errors.New("index out of bounds")
+ }
+ return &BigInt{bi.bigints[index]}, nil
+}
+
+// Set sets the big int at the given index in the slice.
+func (bi *BigInts) Set(index int, bigint *BigInt) error {
+ if index < 0 || index >= len(bi.bigints) {
+ return errors.New("index out of bounds")
+ }
+ bi.bigints[index] = bigint.bigint
+ return nil
+}