gemblockchain 0.3.0

Library to work with Gem blockchain
Documentation 
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use crate::transaction::{Asset, DataEntry};
use base58::*;

pub(crate) struct Buffer {
    buf: Vec<u8>,
}

impl Buffer {
    pub fn new() -> Buffer {
        Buffer { buf: Vec::new() }
    }

    #[allow(dead_code)]
    pub fn from_bytes(b: &[u8]) -> Buffer {
        Buffer { buf: Vec::from(b) }
    }

    pub fn bytes(self: &mut Buffer, b: &[u8]) -> &mut Buffer {
        self.buf.extend_from_slice(b);
        self
    }

    pub fn byte(self: &mut Buffer, b: u8) -> &mut Buffer {
        self.buf.push(b);
        self
    }

    pub fn size(&mut self, n: usize) -> &mut Buffer {
        let bytes = [((n >> 8) & 0xff) as u8, (n & 0xff) as u8];
        self.bytes(&bytes)
    }

    pub fn long(&mut self, n: u64) -> &mut Buffer {
        let bytes = [
            ((n >> 56) & 0xff) as u8,
            ((n >> 48) & 0xff) as u8,
            ((n >> 40) & 0xff) as u8,
            ((n >> 32) & 0xff) as u8,
            ((n >> 24) & 0xff) as u8,
            ((n >> 16) & 0xff) as u8,
            ((n >> 8) & 0xff) as u8,
            (n & 0xff) as u8,
        ];
        self.bytes(&bytes)
    }

    pub fn boolean(&mut self, b: bool) -> &mut Buffer {
        let val = if b { 1 } else { 0 };
        self.buf.push(val);
        self
    }

    pub fn recipient(&mut self, chain_id: u8, recipient: &str) -> &mut Buffer {
        if recipient.len() <= 30 {
            // assume an alias
            self.byte(0x02)
                .byte(chain_id)
                .size(recipient.len())
                .bytes(recipient.as_bytes())
        } else {
            self.bytes(recipient.from_base58().unwrap().as_slice())
        }
    }

    pub fn array(&mut self, arr: &[u8]) -> &mut Buffer {
        self.size(arr.len()).bytes(arr)
    }

    pub fn array_opt(&mut self, arr: Option<&[u8]>) -> &mut Buffer {
        self.array(arr.unwrap_or(&[]))
    }

    pub fn asset(&mut self, asset: &Asset) -> &mut Buffer {
        self.bytes(&asset.to_bytes())
    }

    pub fn asset_opt(&mut self, asset: &Option<&Asset>) -> &mut Buffer {
        match asset {
            Some(aid) => self.byte(1).asset(aid),
            None => self.byte(0),
        }
    }

    pub fn data_entry(&mut self, e: &DataEntry) -> &mut Buffer {
        match *e {
            DataEntry::Integer(key, val) => self.array(key.as_bytes()).byte(0).long(val),
            DataEntry::Boolean(key, val) => self.array(key.as_bytes()).byte(1).boolean(val),
            DataEntry::Binary(key, val) => self.array(key.as_bytes()).byte(2).array(val),
            DataEntry::String(key, val) => self.array(key.as_bytes()).byte(3).array(val.as_bytes()),
        }
    }

    pub fn as_slice(&self) -> &[u8] {
        self.buf.as_slice()
    }
}