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author | obscuren <geffobscura@gmail.com> | 2015-03-23 23:59:09 +0800 |
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committer | obscuren <geffobscura@gmail.com> | 2015-03-23 23:59:09 +0800 |
commit | 0330077d76b48934ab024a309000f83c78047d8a (patch) | |
tree | 2a3ffbcd5bd941b30ed28d0eb5c30553a25324e0 /core/vm/memory.go | |
parent | d7eaa97a297151637af090ecb05bbd6d260d90b8 (diff) | |
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moved state and vm to core
Diffstat (limited to 'core/vm/memory.go')
-rw-r--r-- | core/vm/memory.go | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/core/vm/memory.go b/core/vm/memory.go new file mode 100644 index 000000000..dd47fa1b5 --- /dev/null +++ b/core/vm/memory.go @@ -0,0 +1,76 @@ +package vm + +import ( + "fmt" + + "github.com/ethereum/go-ethereum/common" +) + +type Memory struct { + store []byte +} + +func NewMemory() *Memory { + return &Memory{nil} +} + +func (m *Memory) Set(offset, size uint64, value []byte) { + value = common.RightPadBytes(value, int(size)) + + totSize := offset + size + lenSize := uint64(len(m.store) - 1) + if totSize > lenSize { + // Calculate the diff between the sizes + diff := totSize - lenSize + if diff > 0 { + // Create a new empty slice and append it + newSlice := make([]byte, diff-1) + // Resize slice + m.store = append(m.store, newSlice...) + } + } + copy(m.store[offset:offset+size], value) +} + +func (m *Memory) Resize(size uint64) { + if uint64(m.Len()) < size { + m.store = append(m.store, make([]byte, size-uint64(m.Len()))...) + } +} + +func (self *Memory) Get(offset, size int64) (cpy []byte) { + if size == 0 { + return nil + } + + if len(self.store) > int(offset) { + cpy = make([]byte, size) + copy(cpy, self.store[offset:offset+size]) + + return + } + + return +} + +func (m *Memory) Len() int { + return len(m.store) +} + +func (m *Memory) Data() []byte { + return m.store +} + +func (m *Memory) Print() { + fmt.Printf("### mem %d bytes ###\n", len(m.store)) + if len(m.store) > 0 { + addr := 0 + for i := 0; i+32 <= len(m.store); i += 32 { + fmt.Printf("%03d: % x\n", addr, m.store[i:i+32]) + addr++ + } + } else { + fmt.Println("-- empty --") + } + fmt.Println("####################") +} |