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</pre><pre class='rust '>
<span class='comment'>// Copyright 2015-2017 Parity Technologies (UK) Ltd.</span>
<span class='comment'>// This file is part of Parity.</span>

<span class='comment'>// Parity is free software: you can redistribute it and/or modify</span>
<span class='comment'>// it under the terms of the GNU General Public License as published by</span>
<span class='comment'>// the Free Software Foundation, either version 3 of the License, or</span>
<span class='comment'>// (at your option) any later version.</span>

<span class='comment'>// Parity is distributed in the hope that it will be useful,</span>
<span class='comment'>// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class='comment'>// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class='comment'>// GNU General Public License for more details.</span>

<span class='comment'>// You should have received a copy of the GNU General Public License</span>
<span class='comment'>// along with Parity.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>

<span class='doccomment'>//! View onto block header rlp</span>

<span class='kw'>use</span> <span class='ident'>util</span>::{<span class='ident'>U256</span>, <span class='ident'>Bytes</span>, <span class='ident'>Hashable</span>, <span class='ident'>H256</span>, <span class='ident'>Address</span>, <span class='ident'>H2048</span>};
<span class='kw'>use</span> <span class='ident'>rlp</span>::{<span class='ident'>Rlp</span>, <span class='ident'>View</span>};
<span class='kw'>use</span> <span class='ident'>header</span>::<span class='ident'>BlockNumber</span>;

<span class='doccomment'>/// View onto block header rlp.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>HeaderView</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
	<span class='ident'>rlp</span>: <span class='ident'>Rlp</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>HeaderView</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
	<span class='doccomment'>/// Creates new view onto header from raw bytes.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>bytes</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> [<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='ident'>HeaderView</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
		<span class='ident'>HeaderView</span> {
			<span class='ident'>rlp</span>: <span class='ident'>Rlp</span>::<span class='ident'>new</span>(<span class='ident'>bytes</span>)
		}
	}

	<span class='doccomment'>/// Creates new view onto header from rlp.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_from_rlp</span>(<span class='ident'>rlp</span>: <span class='ident'>Rlp</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>HeaderView</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
		<span class='ident'>HeaderView</span> {
			<span class='ident'>rlp</span>: <span class='ident'>rlp</span>
		}
	}

	<span class='doccomment'>/// Returns header hash.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hash</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>sha3</span>() }

	<span class='doccomment'>/// Returns raw rlp.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>rlp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Rlp</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>rlp</span> }

	<span class='doccomment'>/// Returns parent hash.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>parent_hash</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>0</span>) }

	<span class='doccomment'>/// Returns uncles hash.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>uncles_hash</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>1</span>) }

	<span class='doccomment'>/// Returns author.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>author</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Address</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>2</span>) }

	<span class='doccomment'>/// Returns state root.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>state_root</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>3</span>) }

	<span class='doccomment'>/// Returns transactions root.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>transactions_root</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>4</span>) }

	<span class='doccomment'>/// Returns block receipts root.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>receipts_root</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>5</span>) }

	<span class='doccomment'>/// Returns block log bloom.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>log_bloom</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H2048</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>6</span>) }

	<span class='doccomment'>/// Returns block difficulty.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>difficulty</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>U256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>7</span>) }

	<span class='doccomment'>/// Returns block number.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>number</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>BlockNumber</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>8</span>) }

	<span class='doccomment'>/// Returns block gas limit.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>gas_limit</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>U256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>9</span>) }

	<span class='doccomment'>/// Returns block gas used.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>gas_used</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>U256</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>10</span>) }

	<span class='doccomment'>/// Returns timestamp.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>timestamp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>u64</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>11</span>) }

	<span class='doccomment'>/// Returns block extra data.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>extra_data</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Bytes</span> { <span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>val_at</span>(<span class='number'>12</span>) }

	<span class='doccomment'>/// Returns a vector of post-RLP-encoded seal fields.</span>
	<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>seal</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Bytes</span><span class='op'>&gt;</span> {
		<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>seal</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
		<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>13</span>..<span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>item_count</span>() {
			<span class='ident'>seal</span>.<span class='ident'>push</span>(<span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>at</span>(<span class='ident'>i</span>).<span class='ident'>as_raw</span>().<span class='ident'>to_vec</span>());
		}
		<span class='ident'>seal</span>
	}
}

<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Hashable</span> <span class='kw'>for</span> <span class='ident'>HeaderView</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
	<span class='kw'>fn</span> <span class='ident'>sha3</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>H256</span> {
		<span class='self'>self</span>.<span class='ident'>rlp</span>.<span class='ident'>as_raw</span>().<span class='ident'>sha3</span>()
	}
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
	<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>::<span class='ident'>FromStr</span>;
	<span class='kw'>use</span> <span class='ident'>rustc_serialize</span>::<span class='ident'>hex</span>::<span class='ident'>FromHex</span>;
	<span class='kw'>use</span> <span class='ident'>util</span>::{<span class='ident'>H256</span>, <span class='ident'>Address</span>, <span class='ident'>H2048</span>, <span class='ident'>U256</span>};
	<span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>HeaderView</span>;

	<span class='attribute'>#[<span class='ident'>test</span>]</span>
	<span class='kw'>fn</span> <span class='ident'>test_header_view</span>() {
		<span class='comment'>// that&#39;s rlp of block header created with ethash engine.</span>
		<span class='kw'>let</span> <span class='ident'>rlp</span> <span class='op'>=</span> <span class='string'>&quot;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&quot;</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
		<span class='kw'>let</span> <span class='ident'>mix_hash</span> <span class='op'>=</span> <span class='string'>&quot;a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd&quot;</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();
		<span class='kw'>let</span> <span class='ident'>nonce</span> <span class='op'>=</span> <span class='string'>&quot;88ab4e252a7e8c2a23&quot;</span>.<span class='ident'>from_hex</span>().<span class='ident'>unwrap</span>();

		<span class='kw'>let</span> <span class='ident'>view</span> <span class='op'>=</span> <span class='ident'>HeaderView</span>::<span class='ident'>new</span>(<span class='kw-2'>&amp;</span><span class='ident'>rlp</span>);
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>hash</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;2c9747e804293bd3f1a986484343f23bc88fd5be75dfe9d5c2860aff61e6f259&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>parent_hash</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;d405da4e66f1445d455195229624e133f5baafe72b5cf7b3c36c12c8146e98b7&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>uncles_hash</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>author</span>(), <span class='ident'>Address</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;8888f1f195afa192cfee860698584c030f4c9db1&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>state_root</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;5fb2b4bfdef7b314451cb138a534d225c922fc0e5fbe25e451142732c3e25c25&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>transactions_root</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;88d2ec6b9860aae1a2c3b299f72b6a5d70d7f7ba4722c78f2c49ba96273c2158&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>receipts_root</span>(), <span class='ident'>H256</span>::<span class='ident'>from_str</span>(<span class='string'>&quot;07c6fdfa8eea7e86b81f5b0fc0f78f90cc19f4aa60d323151e0cac660199e9a1&quot;</span>).<span class='ident'>unwrap</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>log_bloom</span>(), <span class='ident'>H2048</span>::<span class='ident'>default</span>());
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>difficulty</span>(), <span class='ident'>U256</span>::<span class='ident'>from</span>(<span class='number'>0x02_00_80</span>));
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>number</span>(), <span class='number'>3</span>);
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>gas_limit</span>(), <span class='ident'>U256</span>::<span class='ident'>from</span>(<span class='number'>0x2f_ef_ba</span>));
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>gas_used</span>(), <span class='ident'>U256</span>::<span class='ident'>from</span>(<span class='number'>0x52_4d</span>));
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>timestamp</span>(), <span class='number'>0x56_8e_93_2a</span>);
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>extra_data</span>(), <span class='macro'>vec</span><span class='macro'>!</span>[] <span class='kw'>as</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>);
		<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>view</span>.<span class='ident'>seal</span>(), <span class='macro'>vec</span><span class='macro'>!</span>[<span class='ident'>mix_hash</span>, <span class='ident'>nonce</span>]);
	}
}
</pre>
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