1use alloc::string::ToString;
4use alloc::vec::Vec;
5use core::fmt;
6use core::ops::Deref;
7use core2::io::{self, Read, Write};
8
9use crate::encoding::{ReadBytesExt, WriteBytesExt};
10use memuse::DynamicUsage;
11use sha2::{Digest, Sha256};
12
13use zcash_encoding::Vector;
14
15pub use equihash;
16
17#[derive(Clone, Copy, PartialEq, Eq, Hash)]
21pub struct BlockHash(pub [u8; 32]);
22
23memuse::impl_no_dynamic_usage!(BlockHash);
24
25impl fmt::Debug for BlockHash {
26 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
27 let block_hash_str = self.to_string();
30 f.debug_tuple("BlockHash").field(&block_hash_str).finish()
31 }
32}
33
34impl fmt::Display for BlockHash {
35 fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
36 let mut data = self.0;
37 data.reverse();
38 formatter.write_str(&hex::encode(data))
39 }
40}
41
42impl BlockHash {
43 pub fn from_slice(bytes: &[u8]) -> Self {
49 Self::try_from_slice(bytes).unwrap()
50 }
51
52 pub fn try_from_slice(bytes: &[u8]) -> Option<Self> {
56 if bytes.len() == 32 {
57 let mut hash = [0; 32];
58 hash.copy_from_slice(bytes);
59 Some(BlockHash(hash))
60 } else {
61 None
62 }
63 }
64}
65
66pub struct BlockHeader {
68 hash: BlockHash,
69 data: BlockHeaderData,
70}
71
72impl Deref for BlockHeader {
73 type Target = BlockHeaderData;
74
75 fn deref(&self) -> &BlockHeaderData {
76 &self.data
77 }
78}
79
80pub struct BlockHeaderData {
82 pub version: i32,
83 pub prev_block: BlockHash,
84 pub merkle_root: [u8; 32],
85 pub final_sapling_root: [u8; 32],
86 pub time: u32,
87 pub bits: u32,
88 pub nonce: [u8; 32],
89 pub solution: Vec<u8>,
90}
91
92impl BlockHeaderData {
93 pub fn freeze(self) -> io::Result<BlockHeader> {
94 BlockHeader::from_data(self)
95 }
96}
97
98impl BlockHeader {
99 fn from_data(data: BlockHeaderData) -> io::Result<Self> {
100 let mut header = BlockHeader {
101 hash: BlockHash([0; 32]),
102 data,
103 };
104 let mut raw = vec![];
105 header.write(&mut raw)?;
106 header
107 .hash
108 .0
109 .copy_from_slice(&Sha256::digest(Sha256::digest(&raw)));
110 Ok(header)
111 }
112
113 pub fn hash(&self) -> BlockHash {
115 self.hash
116 }
117
118 pub fn read<R: Read>(mut reader: R) -> io::Result<Self> {
119 let version = reader.read_i32_le()?;
120
121 let mut prev_block = BlockHash([0; 32]);
122 reader.read_exact(&mut prev_block.0)?;
123
124 let mut merkle_root = [0; 32];
125 reader.read_exact(&mut merkle_root)?;
126
127 let mut final_sapling_root = [0; 32];
128 reader.read_exact(&mut final_sapling_root)?;
129
130 let time = reader.read_u32_le()?;
131 let bits = reader.read_u32_le()?;
132
133 let mut nonce = [0; 32];
134 reader.read_exact(&mut nonce)?;
135
136 let solution = Vector::read(&mut reader, |r| r.read_u8())?;
137
138 BlockHeader::from_data(BlockHeaderData {
139 version,
140 prev_block,
141 merkle_root,
142 final_sapling_root,
143 time,
144 bits,
145 nonce,
146 solution,
147 })
148 }
149
150 pub fn write<W: Write>(&self, mut writer: W) -> io::Result<()> {
151 writer.write_i32_le(self.version)?;
152 writer.write_all(&self.prev_block.0)?;
153 writer.write_all(&self.merkle_root)?;
154 writer.write_all(&self.final_sapling_root)?;
155 writer.write_u32_le(self.time)?;
156 writer.write_u32_le(self.bits)?;
157 writer.write_all(&self.nonce)?;
158 Vector::write(&mut writer, &self.solution, |w, b| w.write_u8(*b))?;
159
160 Ok(())
161 }
162}
163
164#[cfg(test)]
165mod tests {
166 use super::BlockHeader;
167 use alloc::vec::Vec;
168
169 const HEADER_MAINNET_415000: [u8; 1487] = [
170 0x04, 0x00, 0x00, 0x00, 0x52, 0x74, 0xb4, 0x3b, 0x9e, 0x4a, 0xd8, 0xf4, 0x3e, 0x93, 0xf7,
171 0x84, 0x63, 0xd2, 0x4d, 0xcf, 0xe5, 0x31, 0xae, 0xb4, 0x71, 0x98, 0x19, 0xf4, 0xf9, 0x7f,
172 0x7e, 0x03, 0x00, 0x00, 0x00, 0x00, 0x66, 0x30, 0x73, 0xbc, 0x4b, 0xfa, 0x95, 0xc9, 0xbe,
173 0xc3, 0x6a, 0xad, 0x72, 0x68, 0xa5, 0x73, 0x04, 0x97, 0x97, 0xbd, 0xfc, 0x5a, 0xa4, 0xc7,
174 0x43, 0xfb, 0xe4, 0x82, 0x0a, 0xa3, 0x93, 0xce, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
175 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
176 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa8, 0xbe, 0xcc, 0x5b, 0xe1,
177 0xab, 0x03, 0x1c, 0xc2, 0xfd, 0x60, 0x7c, 0x77, 0x6a, 0x7a, 0x00, 0x00, 0x00, 0x00, 0x00,
178 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
179 0x00, 0x3e, 0xb2, 0x18, 0x19, 0xfd, 0x40, 0x05, 0x00, 0x94, 0x9d, 0x55, 0xde, 0x0c, 0xc6,
180 0x33, 0xe0, 0xcc, 0xe4, 0x1e, 0x46, 0x49, 0xef, 0x4a, 0xa3, 0x34, 0x9f, 0x01, 0x00, 0x29,
181 0x0f, 0xfe, 0x28, 0x1b, 0x94, 0x7b, 0x3b, 0x53, 0xfb, 0xd2, 0xf3, 0x5b, 0x1c, 0xe2, 0x92,
182 0x64, 0x9b, 0x96, 0xac, 0x6e, 0x08, 0x83, 0xaf, 0x3a, 0x68, 0x44, 0xb9, 0x55, 0x92, 0xe7,
183 0x45, 0x56, 0xda, 0x34, 0x4b, 0x47, 0x01, 0x96, 0x1c, 0xd4, 0x13, 0x0c, 0x68, 0x21, 0x9c,
184 0xfa, 0x13, 0x41, 0xd5, 0xaf, 0xb5, 0x04, 0x9e, 0xb0, 0xe8, 0xbe, 0x4a, 0x2d, 0x92, 0xd6,
185 0x78, 0xc4, 0x07, 0x85, 0xe3, 0x37, 0x05, 0x54, 0x8b, 0x5f, 0x3a, 0x54, 0xf0, 0xa4, 0xc3,
186 0x9a, 0x2f, 0x58, 0xee, 0x78, 0x4a, 0x24, 0x16, 0x3c, 0xd8, 0x6f, 0x54, 0x81, 0x23, 0x27,
187 0xdf, 0x55, 0xe1, 0xd5, 0x5c, 0xa8, 0x4b, 0x6e, 0x7b, 0x88, 0x7a, 0x7c, 0xbf, 0xb9, 0x09,
188 0x1a, 0x58, 0x5b, 0xdb, 0x8e, 0xa4, 0x75, 0x93, 0x07, 0xc5, 0x6c, 0x1b, 0x3d, 0xaf, 0xc6,
189 0x69, 0x24, 0x5a, 0x6f, 0x65, 0x4b, 0x6f, 0x73, 0x00, 0x52, 0x26, 0x6a, 0x01, 0xad, 0x4f,
190 0x9c, 0x0b, 0x59, 0xed, 0x4e, 0x17, 0x71, 0x2b, 0x3e, 0x72, 0xdf, 0x04, 0x98, 0xaa, 0x8d,
191 0xe4, 0x88, 0x8f, 0x99, 0x35, 0x31, 0xc6, 0x0a, 0xcd, 0xed, 0x1d, 0x4b, 0x66, 0xe8, 0x9d,
192 0xe0, 0xb6, 0x48, 0x2c, 0xcc, 0xd4, 0xa7, 0x12, 0xf5, 0xcf, 0x9d, 0x4c, 0xa8, 0x3b, 0xe0,
193 0xf9, 0x22, 0xde, 0x2c, 0x1d, 0xbb, 0x3a, 0x14, 0x07, 0x48, 0x0d, 0xbe, 0x87, 0x95, 0x99,
194 0x3d, 0x8b, 0xe6, 0x40, 0x98, 0x8a, 0xbf, 0xe7, 0xa8, 0xa1, 0xb3, 0x3a, 0x12, 0x13, 0x1c,
195 0x45, 0x1e, 0x1a, 0xbc, 0x0d, 0x83, 0xfb, 0x85, 0x18, 0x62, 0xc6, 0x37, 0xce, 0x72, 0x4d,
196 0x5f, 0xe9, 0x7a, 0xa9, 0xa8, 0x06, 0xcf, 0x34, 0xba, 0xb5, 0x09, 0xf4, 0x55, 0x4b, 0x0c,
197 0xd1, 0x0a, 0x7d, 0xdf, 0xd5, 0x82, 0x1b, 0x09, 0x1a, 0xd2, 0xc9, 0x0c, 0x1a, 0xa1, 0xd8,
198 0x1e, 0xb3, 0xd7, 0x2d, 0xb4, 0x19, 0x93, 0xb6, 0x48, 0xf4, 0x1e, 0x21, 0x38, 0xff, 0x95,
199 0x31, 0xa3, 0x0f, 0xf7, 0x3b, 0x22, 0x14, 0x0e, 0x4e, 0xbd, 0x7b, 0xaa, 0x33, 0x84, 0x8e,
200 0x51, 0x2d, 0x99, 0x30, 0x0c, 0x5c, 0x13, 0x1c, 0x6e, 0x75, 0xf5, 0x71, 0x4a, 0x5c, 0x6d,
201 0xcb, 0x17, 0x8b, 0x4a, 0x49, 0x78, 0xda, 0xc8, 0x3a, 0xd4, 0x12, 0xfb, 0xd6, 0x92, 0x01,
202 0x92, 0x50, 0xc5, 0x53, 0x04, 0x9a, 0xad, 0x45, 0x79, 0x84, 0xbe, 0xdf, 0xc9, 0x6a, 0xe7,
203 0x01, 0xc6, 0x59, 0xbc, 0x70, 0x07, 0xa9, 0x7d, 0x0a, 0x90, 0x02, 0xb9, 0x45, 0xbd, 0xec,
204 0x45, 0xa9, 0x45, 0xef, 0x62, 0x85, 0xb2, 0xcd, 0x55, 0x3b, 0x4c, 0x09, 0xd9, 0x07, 0xc6,
205 0x27, 0x86, 0x3f, 0x03, 0x99, 0xe8, 0x72, 0x5b, 0x4f, 0xf7, 0xfc, 0x59, 0x79, 0xe3, 0xcf,
206 0xf2, 0x28, 0x14, 0x50, 0x84, 0x48, 0xef, 0x8b, 0x98, 0x31, 0xc2, 0x85, 0x95, 0x93, 0x33,
207 0x39, 0x6a, 0xa3, 0x62, 0xa5, 0x1c, 0xf2, 0x05, 0x09, 0x7a, 0xfa, 0xbe, 0xc1, 0x5e, 0x41,
208 0xfb, 0x6e, 0x30, 0xb6, 0x22, 0x37, 0x4b, 0xf5, 0x8b, 0x37, 0xef, 0x9d, 0x1b, 0x24, 0x1e,
209 0xad, 0x5a, 0x68, 0x2b, 0x98, 0xb6, 0x57, 0x49, 0xa5, 0x75, 0x68, 0xe2, 0x38, 0xd5, 0x0a,
210 0xfd, 0x41, 0x7e, 0x1e, 0x96, 0x0e, 0x7b, 0x5a, 0x06, 0x4f, 0xd9, 0xf6, 0x94, 0xd7, 0x83,
211 0xa2, 0xcb, 0xcd, 0x58, 0x55, 0x2d, 0xed, 0xbb, 0x9e, 0x5e, 0x11, 0x23, 0x67, 0x4e, 0xf7,
212 0x3a, 0x52, 0x41, 0x96, 0xcf, 0x05, 0xd3, 0xe5, 0x24, 0x66, 0x05, 0x49, 0xff, 0xe7, 0xbd,
213 0x65, 0x68, 0x05, 0x71, 0x35, 0xff, 0xd5, 0xaf, 0xd9, 0x43, 0xf6, 0xda, 0x11, 0xcb, 0xb5,
214 0x97, 0xe8, 0xcc, 0xec, 0xd7, 0x7e, 0xcb, 0xe9, 0x09, 0xde, 0x06, 0x31, 0xbf, 0xa2, 0x9c,
215 0xd3, 0xe3, 0xd5, 0x54, 0x46, 0x71, 0xba, 0x80, 0x25, 0x61, 0x53, 0xd6, 0xe9, 0x99, 0x0b,
216 0x88, 0xad, 0x8e, 0x0c, 0xf4, 0x98, 0x9b, 0xef, 0x4b, 0xe4, 0x57, 0xf9, 0xc7, 0xb0, 0xf1,
217 0xaa, 0xcd, 0x6e, 0x0e, 0xf3, 0x20, 0x60, 0x5c, 0x29, 0xed, 0x0c, 0xd2, 0xeb, 0x6c, 0xfc,
218 0xe2, 0x16, 0xc5, 0x2a, 0x31, 0x75, 0x80, 0x20, 0x1c, 0xad, 0x7a, 0x09, 0x43, 0xd2, 0x4b,
219 0x7b, 0x06, 0xd5, 0xbf, 0x75, 0x87, 0x61, 0xdd, 0x96, 0xe1, 0x19, 0x70, 0xb5, 0xde, 0xd6,
220 0x97, 0x22, 0x2b, 0x2c, 0x77, 0xe7, 0xf2, 0x56, 0xa6, 0x05, 0xac, 0x75, 0x55, 0x49, 0xc1,
221 0x65, 0x1f, 0x25, 0xad, 0xfc, 0x9d, 0x53, 0xd9, 0x11, 0x7e, 0x3a, 0x0b, 0xb4, 0x09, 0xee,
222 0xe4, 0xa6, 0x00, 0x12, 0x04, 0x72, 0x94, 0x9c, 0x7d, 0xda, 0x1c, 0x2e, 0xdb, 0x3c, 0x33,
223 0x0c, 0x7f, 0x96, 0x17, 0x99, 0x82, 0x91, 0x64, 0x57, 0xd3, 0x31, 0xe9, 0x63, 0x09, 0xdd,
224 0x24, 0xdf, 0x74, 0xee, 0xdd, 0x00, 0xe7, 0xdb, 0x49, 0x7e, 0xe1, 0x30, 0xf7, 0x7d, 0xe6,
225 0x66, 0xeb, 0x55, 0x7f, 0xb3, 0x16, 0xe8, 0x7a, 0xda, 0xf1, 0x81, 0x3c, 0xe4, 0x26, 0xa4,
226 0x58, 0xa6, 0xee, 0xe3, 0xa8, 0x5b, 0x2a, 0xb8, 0x8f, 0x65, 0x53, 0xaa, 0xda, 0xe8, 0xde,
227 0x65, 0x2e, 0x21, 0x1a, 0x1d, 0x9f, 0x33, 0x4d, 0x59, 0x6b, 0x5e, 0xb6, 0x17, 0x34, 0x07,
228 0xef, 0xcc, 0x2e, 0x81, 0x54, 0xbb, 0x9c, 0xa1, 0x21, 0x2a, 0xa9, 0xa1, 0xa1, 0x12, 0x1d,
229 0x2f, 0x5a, 0x77, 0x12, 0xcf, 0x25, 0xcc, 0x81, 0x48, 0xb8, 0x05, 0x2e, 0x0d, 0x2e, 0x09,
230 0xf2, 0x0e, 0x5b, 0xa2, 0xa9, 0x82, 0x77, 0xe9, 0x75, 0xb0, 0xee, 0xd9, 0xa8, 0x92, 0x06,
231 0x96, 0x63, 0x37, 0x16, 0x3f, 0x21, 0x5c, 0x9d, 0x04, 0xa6, 0x59, 0x8b, 0x09, 0x58, 0xd3,
232 0x33, 0xd8, 0x46, 0x77, 0x3c, 0x69, 0xe5, 0xab, 0xfd, 0x0a, 0x04, 0x27, 0xf3, 0x66, 0x06,
233 0x14, 0xdd, 0x82, 0xb7, 0x9a, 0xdb, 0x85, 0x1a, 0x0d, 0x58, 0xb6, 0x2d, 0xf5, 0xf0, 0xb3,
234 0xac, 0x83, 0x6e, 0x6e, 0x25, 0xf3, 0xa5, 0x1f, 0x49, 0xa9, 0x9a, 0xde, 0x57, 0x79, 0x6f,
235 0xe9, 0xfc, 0xc2, 0x6f, 0x0a, 0x1f, 0x94, 0xff, 0x08, 0x19, 0xfe, 0x52, 0xb7, 0x50, 0x87,
236 0xed, 0xbe, 0xd3, 0xa8, 0x16, 0x26, 0xeb, 0x54, 0x16, 0xc6, 0x65, 0x57, 0xf1, 0x1c, 0x0f,
237 0xce, 0xdf, 0xf2, 0x23, 0xd6, 0xaa, 0x8c, 0xd5, 0xc3, 0x53, 0x86, 0xe5, 0xb4, 0xb9, 0x5a,
238 0x0f, 0x03, 0x92, 0xca, 0x30, 0x1a, 0x38, 0xb3, 0x68, 0x7d, 0x09, 0x44, 0x93, 0xb9, 0xe9,
239 0xd2, 0x64, 0xd0, 0x7a, 0x19, 0x0c, 0xe5, 0x7d, 0x11, 0x68, 0x04, 0x38, 0x2a, 0x3f, 0xab,
240 0xe1, 0x5a, 0xf4, 0xdf, 0x4f, 0xa0, 0x43, 0xf0, 0x28, 0x7a, 0xa1, 0xed, 0x55, 0x68, 0xd9,
241 0xef, 0x5d, 0x12, 0x51, 0x0d, 0x01, 0x0c, 0xcd, 0xab, 0x4e, 0xb6, 0x16, 0xf6, 0xdf, 0x13,
242 0xbb, 0x31, 0x26, 0xef, 0x43, 0xd9, 0xd6, 0x57, 0x35, 0xe4, 0xe4, 0xc0, 0x4b, 0x57, 0x63,
243 0x48, 0xd0, 0x40, 0xb5, 0x35, 0x05, 0x5a, 0x3d, 0x5a, 0xe1, 0x91, 0xb7, 0x5f, 0x06, 0x12,
244 0xf3, 0xb2, 0x40, 0x66, 0xa0, 0x52, 0x45, 0xf2, 0x7f, 0xe5, 0x7b, 0xda, 0x66, 0xbd, 0x6d,
245 0xec, 0x7e, 0x4f, 0xc9, 0xcb, 0x23, 0x68, 0x02, 0x06, 0x2a, 0xdd, 0xe3, 0xcd, 0x0e, 0x31,
246 0x34, 0x82, 0xc9, 0x2a, 0x0c, 0x72, 0x11, 0x02, 0xb1, 0xf3, 0x8b, 0x01, 0x5a, 0xb8, 0xd0,
247 0x15, 0x59, 0xcb, 0xcb, 0x40, 0xf6, 0x74, 0xe9, 0xef, 0xad, 0x5e, 0xe9, 0xc2, 0xfe, 0x13,
248 0x3f, 0xaa, 0x55, 0xca, 0x1d, 0xd0, 0xff, 0x26, 0x71, 0x0f, 0x9d, 0xa8, 0x19, 0xcc, 0x14,
249 0x59, 0xcb, 0x7e, 0xd2, 0x60, 0xda, 0xd3, 0xdb, 0x05, 0x96, 0x25, 0x8d, 0x47, 0xc7, 0x4c,
250 0x32, 0xa8, 0xb8, 0x52, 0xb6, 0x71, 0xc5, 0xa0, 0xca, 0xa2, 0x00, 0x16, 0x03, 0xd9, 0x0c,
251 0x91, 0xa7, 0xdf, 0x2e, 0x2d, 0x4e, 0xe9, 0xae, 0x9b, 0xf1, 0xa6, 0xb1, 0xec, 0x88, 0x15,
252 0x1c, 0x62, 0x36, 0x0d, 0x03, 0x02, 0x4d, 0x2e, 0x2d, 0x01, 0x14, 0x08, 0x4f, 0x6b, 0x88,
253 0xc5, 0xbb, 0xa2, 0x4a, 0xa7, 0xce, 0xcf, 0xac, 0x16, 0xe9, 0x1e, 0x0b, 0xaf, 0x3d, 0x86,
254 0x53, 0xe2, 0x18, 0x09, 0x3e, 0x81, 0xd2, 0xa6, 0x3c, 0x32, 0xef, 0xf1, 0xd9, 0x03, 0x0f,
255 0x9e, 0x14, 0x14, 0xec, 0xe4, 0x20, 0xda, 0xa2, 0x4e, 0x0d, 0xd5, 0xb8, 0x45, 0xb3, 0x27,
256 0x4b, 0xb8, 0x39, 0xca, 0x1c, 0x53, 0xbc, 0xc0, 0x19, 0x42, 0x42, 0xd7, 0x4b, 0x26, 0x31,
257 0xb9, 0x49, 0x5a, 0x65, 0x4f, 0xbb, 0xdc, 0xbf, 0xad, 0x77, 0x9f, 0x73, 0x22, 0xb6, 0x07,
258 0x36, 0x24, 0x98, 0x80, 0x60, 0x48, 0x21, 0xd9, 0x69, 0x24, 0xe3, 0xfa, 0x39, 0x7f, 0x35,
259 0x4a, 0x5e, 0xcc, 0xa3, 0x4f, 0x61, 0x4d, 0xa5, 0x45, 0x6f, 0x9b, 0x36, 0x33, 0x8c, 0x37,
260 0xd8, 0xf6, 0xfb, 0xf6, 0x26, 0xbe, 0x98, 0x34, 0x77, 0x76, 0x60, 0x22, 0x87, 0x27, 0x46,
261 0xda, 0x10, 0xa1, 0x77, 0x1c, 0xeb, 0x02, 0xdd, 0x8a, 0xac, 0x01, 0xba, 0x18, 0x6b, 0xf1,
262 0x48, 0x86, 0x30, 0x47, 0x9e, 0x12, 0x84, 0xda, 0x01, 0x90, 0xfc, 0xe8, 0xb5, 0x9a, 0xc6,
263 0xb0, 0xfd, 0x41, 0x6b, 0xee, 0x56, 0xb7, 0x2f, 0x0a, 0x58, 0x45, 0x15, 0x35, 0x57, 0xff,
264 0x0f, 0x49, 0x50, 0xa0, 0xdc, 0x5b, 0xe6, 0x5c, 0xe9, 0x42, 0xd2, 0x2e, 0x18, 0x53, 0x4c,
265 0x4e, 0x0e, 0xfa, 0xbb, 0x2d, 0x15, 0x25, 0xdc, 0x48, 0x58, 0xb9, 0xb0, 0xf7, 0x7d, 0x47,
266 0x4a, 0x12, 0x5e, 0xbc, 0x25, 0x0e, 0x08, 0xfe, 0xdb, 0xfa, 0xa6, 0x6f, 0x45, 0x3d, 0x90,
267 0x93, 0x2c, 0xab, 0x3f, 0xf4, 0x52, 0x21, 0x90, 0x99, 0x68, 0xe5, 0x1e, 0x6b, 0xc2, 0x54,
268 0xd5, 0x09, 0xad, 0xeb, 0x75, 0xcb, 0xa7, 0x6d, 0x48, 0xfe, 0x02, 0x4e, 0x3e, 0x66, 0xd8,
269 0xdf, 0x5e,
270 ];
271
272 #[test]
273 fn header_read_write() {
274 let header = BlockHeader::read(&HEADER_MAINNET_415000[..]).unwrap();
275 assert_eq!(
276 format!("{}", header.hash()),
277 "0000000001ab37793ce771262b2ffa082519aa3fe891250a1adb43baaf856168"
278 );
279 let mut encoded = Vec::with_capacity(HEADER_MAINNET_415000.len());
280 header.write(&mut encoded).unwrap();
281 assert_eq!(&HEADER_MAINNET_415000[..], &encoded[..]);
282 }
283}