github-oracle/contracts/lib/JSONLib.sol

pragma solidity ^0.4.8;

library JSONLib {
    
    function getNextString(bytes _str, uint8 _pos) internal constant returns (string,uint8) {
        uint8 start = 0;
        uint8 end = 0;
        uint strl =_str.length;
        for (;strl > _pos; _pos++) {
            if (_str[_pos] == '"'){ //Found quotation mark
                if(_str[_pos-1] != '\\'){ //is not escaped
	                end = start == 0 ? 0: _pos;
	                start = start == 0 ? (_pos+1) : start;
	                if(end > 0) break; 
                }
            }
        }
    	bytes memory str = new bytes(end-start);
        for(_pos=0; _pos<str.length; _pos++){
            str[_pos] = _str[start+_pos];
        }
        for(_pos=end+1; _pos<_str.length; _pos++) if (_str[_pos] == ','){ _pos++; break; } //end

        return (string(str),_pos);
	}
	

    function getNextUInt(bytes _str, uint8 _pos) internal constant returns (uint,uint8) {
        uint val = 0;
        uint strl =_str.length;
        for (; strl > _pos; _pos++) {
            byte bp = _str[_pos];
            if (bp == ','){ //Find ends
                _pos++; break;
            }else if ((bp >= 48)&&(bp <= 57)){ //only ASCII numbers
                val *= 10;
                val += uint(bp) - 48;
            }
        }
        return (val,_pos);
    }

    function getNextAddr(bytes _str, uint8 _pos) internal constant returns (address, uint8){
        uint160 iaddr = 0;
        uint strl =_str.length;
        for(;strl > _pos; _pos++){
            byte bp = _str[_pos];
             if (bp == '0'){ 
                if (_str[_pos+1] == 'x'){
                    for (_pos=_pos+2; _pos<2+2*20; _pos+=2){
                        iaddr *= 256;
                        iaddr += (uint160(hexVal(uint160(_str[_pos])))*16+uint160(hexVal(uint160(_str[_pos+1]))));
                    }
                    _pos++; 
                    break;
                }
            }else if (bp == ','){ 
                _pos++; 
                break; 
            } 
        }
        return (address(iaddr),_pos);
    }
    
    function hexVal(uint val) internal constant returns (uint){
		//return val - (val < 58 ? 48 : 55); //uppercase
		//return val - (val < 58 ? 48 : 87); //lowercase
		return val - (val < 58 ? 48 : (val < 97 ? 55 : 87)); //both
    }
}