From 6623500c6b2e5fe9fa41a1ce75269955af6026e8 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Mon, 27 Oct 2014 11:22:27 +0100
Subject: [PATCH] Implemented new bloom filter. Closes #156
---
ethchain/bloom9.go | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 ethchain/bloom9.go
diff --git a/ethchain/bloom9.go b/ethchain/bloom9.go
new file mode 100644
index 000000000..eef0a9d3f
--- /dev/null
+++ b/ethchain/bloom9.go
@@ -0,0 +1,38 @@
+package ethchain
+
+import "github.com/ethereum/go-ethereum/vm"
+
+func CreateBloom(txs Transactions) uint64 {
+ var bin uint64
+ for _, tx := range txs {
+ bin |= logsBloom(tx.logs)
+ }
+
+ return bin
+}
+
+func logsBloom(logs []vm.Log) uint64 {
+ var bin uint64
+ for _, log := range logs {
+ data := []byte{log.Address}
+ for _, topic := range log.Topics {
+ data = append(data, topic.Bytes())
+ }
+ data = append(data, log.Data)
+
+ for _, b := range data {
+ bin |= bloom9(b)
+ }
+ }
+
+ return bin
+}
+
+func bloom9(b []byte) uint64 {
+ var r uint64
+ for _, i := range []int{0, 2, 4} {
+ r |= 1 << (b[i+1] + 256*(b[i]&1))
+ }
+
+ return r
+}
--
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