44 lines
869 B
Rust
44 lines
869 B
Rust
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use util::hash::H256;
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use chainfilter::BloomIndex;
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use extras::BlocksBloomLocation;
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pub struct BloomIndexer {
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index_size: usize,
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levels: u8,
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}
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impl BloomIndexer {
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pub fn new(index_size: usize, levels: u8) -> Self {
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BloomIndexer {
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index_size: index_size,
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levels: levels
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}
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}
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/// Calculates bloom's position in database.
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pub fn location(&self, bloom_index: &BloomIndex) -> BlocksBloomLocation {
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use std::{mem, ptr};
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let hash = unsafe {
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let mut hash: H256 = mem::zeroed();
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ptr::copy(&[bloom_index.index / self.index_size] as *const usize as *const u8, hash.as_mut_ptr(), 8);
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hash[8] = bloom_index.level;
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hash.reverse();
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hash
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};
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BlocksBloomLocation {
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hash: hash,
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index: bloom_index.index % self.index_size
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}
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}
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pub fn index_size(&self) -> usize {
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self.index_size
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}
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pub fn levels(&self) -> u8 {
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self.levels
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}
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}
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