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authorobscuren <geffobscura@gmail.com>2014-07-30 05:33:18 +0800
committerobscuren <geffobscura@gmail.com>2014-07-30 05:33:18 +0800
commit6fd2401cdf792996c0183f896412831dd335377a (patch)
treee337868224aaaf024641b5465b2e2c78106c8573 /ethutil
parent6e94c024e476a0e96b81d1cdd60dbb88b723593a (diff)
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Fixed issue with var int reading.
Reading uneven byte slices were broken.
Diffstat (limited to 'ethutil')
-rw-r--r--ethutil/bytes.go30
-rw-r--r--ethutil/value.go1
2 files changed, 27 insertions, 4 deletions
diff --git a/ethutil/bytes.go b/ethutil/bytes.go
index 53b8cf645..eca2cc366 100644
--- a/ethutil/bytes.go
+++ b/ethutil/bytes.go
@@ -45,15 +45,15 @@ func BytesToNumber(b []byte) uint64 {
//
// Read a variable length number in big endian byte order
func ReadVarint(reader *bytes.Reader) (ret uint64) {
- if reader.Len() == 8 {
+ if reader.Len() > 4 {
var num uint64
binary.Read(reader, binary.BigEndian, &num)
ret = uint64(num)
- } else if reader.Len() == 4 {
+ } else if reader.Len() > 2 {
var num uint32
binary.Read(reader, binary.BigEndian, &num)
ret = uint64(num)
- } else if reader.Len() == 2 {
+ } else if reader.Len() > 0 {
var num uint16
binary.Read(reader, binary.BigEndian, &num)
ret = uint64(num)
@@ -66,6 +66,30 @@ func ReadVarint(reader *bytes.Reader) (ret uint64) {
return ret
}
+func ReadVarInt(buff []byte) (ret uint64) {
+ switch l := len(buff); {
+ case l > 4:
+ d := LeftPadBytes(buff, 8)
+ binary.Read(bytes.NewReader(d), binary.BigEndian, &ret)
+ case l > 2:
+ var num uint32
+ d := LeftPadBytes(buff, 4)
+ binary.Read(bytes.NewReader(d), binary.BigEndian, &num)
+ ret = uint64(num)
+ case l > 1:
+ var num uint16
+ d := LeftPadBytes(buff, 2)
+ binary.Read(bytes.NewReader(d), binary.BigEndian, &num)
+ ret = uint64(num)
+ default:
+ var num uint8
+ binary.Read(bytes.NewReader(buff), binary.BigEndian, &num)
+ ret = uint64(num)
+ }
+
+ return
+}
+
// Binary length
//
// Returns the true binary length of the given number
diff --git a/ethutil/value.go b/ethutil/value.go
index 635683e66..85dc44ed6 100644
--- a/ethutil/value.go
+++ b/ethutil/value.go
@@ -67,7 +67,6 @@ func (val *Value) Uint() uint64 {
return uint64(Val)
} else if Val, ok := val.Val.([]byte); ok {
return new(big.Int).SetBytes(Val).Uint64()
- //return ReadVarint(bytes.NewReader(Val))
} else if Val, ok := val.Val.(*big.Int); ok {
return Val.Uint64()
}