github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/mobile/big.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  // Contains all the wrappers from the math/big package.
    19  
    20  package geth
    21  
    22  import (
    23  	"errors"
    24  	"math/big"
    25  
    26  	"github.com/AigarNetwork/aigar/common"
    27  )
    28  
    29  // A BigInt represents a signed multi-precision integer.
    30  type BigInt struct {
    31  	bigint *big.Int
    32  }
    33  
    34  // NewBigInt allocates and returns a new BigInt set to x.
    35  func NewBigInt(x int64) *BigInt {
    36  	return &BigInt{big.NewInt(x)}
    37  }
    38  
    39  // GetBytes returns the absolute value of x as a big-endian byte slice.
    40  func (bi *BigInt) GetBytes() []byte {
    41  	return bi.bigint.Bytes()
    42  }
    43  
    44  // String returns the value of x as a formatted decimal string.
    45  func (bi *BigInt) String() string {
    46  	return bi.bigint.String()
    47  }
    48  
    49  // GetInt64 returns the int64 representation of x. If x cannot be represented in
    50  // an int64, the result is undefined.
    51  func (bi *BigInt) GetInt64() int64 {
    52  	return bi.bigint.Int64()
    53  }
    54  
    55  // SetBytes interprets buf as the bytes of a big-endian unsigned integer and sets
    56  // the big int to that value.
    57  func (bi *BigInt) SetBytes(buf []byte) {
    58  	bi.bigint.SetBytes(common.CopyBytes(buf))
    59  }
    60  
    61  // SetInt64 sets the big int to x.
    62  func (bi *BigInt) SetInt64(x int64) {
    63  	bi.bigint.SetInt64(x)
    64  }
    65  
    66  // Sign returns:
    67  //
    68  //	-1 if x <  0
    69  //	 0 if x == 0
    70  //	+1 if x >  0
    71  //
    72  func (bi *BigInt) Sign() int {
    73  	return bi.bigint.Sign()
    74  }
    75  
    76  // SetString sets the big int to x.
    77  //
    78  // The string prefix determines the actual conversion base. A prefix of "0x" or
    79  // "0X" selects base 16; the "0" prefix selects base 8, and a "0b" or "0B" prefix
    80  // selects base 2. Otherwise the selected base is 10.
    81  func (bi *BigInt) SetString(x string, base int) {
    82  	bi.bigint.SetString(x, base)
    83  }
    84  
    85  // BigInts represents a slice of big ints.
    86  type BigInts struct{ bigints []*big.Int }
    87  
    88  // NewBigInts creates a slice of uninitialized big numbers.
    89  func NewBigInts(size int) *BigInts {
    90  	return &BigInts{
    91  		bigints: make([]*big.Int, size),
    92  	}
    93  }
    94  
    95  // Size returns the number of big ints in the slice.
    96  func (bi *BigInts) Size() int {
    97  	return len(bi.bigints)
    98  }
    99  
   100  // Get returns the bigint at the given index from the slice.
   101  func (bi *BigInts) Get(index int) (bigint *BigInt, _ error) {
   102  	if index < 0 || index >= len(bi.bigints) {
   103  		return nil, errors.New("index out of bounds")
   104  	}
   105  	return &BigInt{bi.bigints[index]}, nil
   106  }
   107  
   108  // Set sets the big int at the given index in the slice.
   109  func (bi *BigInts) Set(index int, bigint *BigInt) error {
   110  	if index < 0 || index >= len(bi.bigints) {
   111  		return errors.New("index out of bounds")
   112  	}
   113  	bi.bigints[index] = bigint.bigint
   114  	return nil
   115  }
   116  
   117  // GetString returns the value of x as a formatted string in some number base.
   118  func (bi *BigInt) GetString(base int) string {
   119  	return bi.bigint.Text(base)
   120  }