github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/mobile/big.go (about)

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