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common: Update README.md for the current package name

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Jeff R. Allen 2015-09-10 23:59:38 +06:00
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common/README.md
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@ -1,49 +1,50 @@
# ethutil # common
[![Build [![Build
Status](https://travis-ci.org/ethereum/go-ethereum.png?branch=master)](https://travis-ci.org/ethereum/go-ethereum) Status](https://travis-ci.org/ethereum/go-ethereum.png?branch=master)](https://travis-ci.org/ethereum/go-ethereum)
The ethutil package contains the ethereum utility library. The common package contains the ethereum utility library.
# Installation # Installation
`go get github.com/ethereum/ethutil-go` As a subdirectory the main go-ethereum repository, you get it with
`go get github.com/ethereum/go-ethereum`.
# Usage # Usage
## RLP (Recursive Linear Prefix) Encoding ## RLP (Recursive Linear Prefix) Encoding
RLP Encoding is an encoding scheme utilized by the Ethereum project. It RLP Encoding is an encoding scheme used by the Ethereum project. It
encodes any native value or list to string. encodes any native value or list to a string.
More in depth information about the Encoding scheme see the [Wiki](http://wiki.ethereum.org/index.php/RLP) More in depth information about the encoding scheme see the
article. [Wiki](http://wiki.ethereum.org/index.php/RLP) article.
```go ```go
rlp := ethutil.Encode("doge") rlp := common.Encode("doge")
fmt.Printf("%q\n", rlp) // => "\0x83dog" fmt.Printf("%q\n", rlp) // => "\0x83dog"
rlp = ethutil.Encode([]interface{}{"dog", "cat"}) rlp = common.Encode([]interface{}{"dog", "cat"})
fmt.Printf("%q\n", rlp) // => "\0xc8\0x83dog\0x83cat" fmt.Printf("%q\n", rlp) // => "\0xc8\0x83dog\0x83cat"
decoded := ethutil.Decode(rlp) decoded := common.Decode(rlp)
fmt.Println(decoded) // => ["dog" "cat"] fmt.Println(decoded) // => ["dog" "cat"]
``` ```
## Patricia Trie ## Patricia Trie
Patricie Tree is a merkle trie utilized by the Ethereum project. Patricie Tree is a merkle trie used by the Ethereum project.
More in depth information about the (modified) Patricia Trie can be More in depth information about the (modified) Patricia Trie can be
found on the [Wiki](http://wiki.ethereum.org/index.php/Patricia_Tree). found on the [Wiki](http://wiki.ethereum.org/index.php/Patricia_Tree).
The patricia trie uses a db as backend and could be anything as long as The patricia trie uses a db as backend and could be anything as long as
it satisfies the Database interface found in `ethutil/db.go`. it satisfies the Database interface found in `common/db.go`.
```go ```go
db := NewDatabase() db := NewDatabase()
// db, root // db, root
trie := ethutil.NewTrie(db, "") trie := common.NewTrie(db, "")
trie.Put("puppy", "dog") trie.Put("puppy", "dog")
trie.Put("horse", "stallion") trie.Put("horse", "stallion")
@ -65,7 +66,7 @@ all (key, value) bindings.
// ... Create db/trie // ... Create db/trie
// Note that RLP uses interface slices as list // Note that RLP uses interface slices as list
value := ethutil.Encode([]interface{}{"one", 2, "three", []interface{}{42}}) value := common.Encode([]interface{}{"one", 2, "three", []interface{}{42}})
// Store the RLP encoded value of the list // Store the RLP encoded value of the list
trie.Put("mykey", value) trie.Put("mykey", value)
``` ```
@ -89,7 +90,7 @@ type (e.g. `Slice()` returns []interface{}, `Uint()` return 0, etc).
`Append(v)` appends the value (v) to the current value/list. `Append(v)` appends the value (v) to the current value/list.
```go ```go
val := ethutil.NewEmptyValue().Append(1).Append("2") val := common.NewEmptyValue().Append(1).Append("2")
val.AppendList().Append(3) val.AppendList().Append(3)
``` ```
@ -110,7 +111,7 @@ val.AppendList().Append(3)
`Byte()` returns the value as a single byte. `Byte()` returns the value as a single byte.
```go ```go
val := ethutil.NewValue([]interface{}{1,"2",[]interface{}{3}}) val := common.NewValue([]interface{}{1,"2",[]interface{}{3}})
val.Get(0).Uint() // => 1 val.Get(0).Uint() // => 1
val.Get(1).Str() // => "2" val.Get(1).Str() // => "2"
s := val.Get(2) // => Value([]interface{}{3}) s := val.Get(2) // => Value([]interface{}{3})
@ -122,7 +123,7 @@ s.Get(0).Uint() // => 3
Decoding streams of RLP data is simplified Decoding streams of RLP data is simplified
```go ```go
val := ethutil.NewValueFromBytes(rlpData) val := common.NewValueFromBytes(rlpData)
val.Get(0).Uint() val.Get(0).Uint()
``` ```
@ -132,7 +133,7 @@ Encoding from Value to RLP is done with the `Encode` method. The
underlying value can be anything RLP can encode (int, str, lists, bytes) underlying value can be anything RLP can encode (int, str, lists, bytes)
```go ```go
val := ethutil.NewValue([]interface{}{1,"2",[]interface{}{3}}) val := common.NewValue([]interface{}{1,"2",[]interface{}{3}})
rlp := val.Encode() rlp := val.Encode()
// Store the rlp data // Store the rlp data
Store(rlp) Store(rlp)