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-rw-r--r--vm/memory.go72
1 files changed, 72 insertions, 0 deletions
diff --git a/vm/memory.go b/vm/memory.go
new file mode 100644
index 000000000..2a1e6e1b9
--- /dev/null
+++ b/vm/memory.go
@@ -0,0 +1,72 @@
+package vm
+
+import "fmt"
+
+type Memory struct {
+ store []byte
+}
+
+func NewMemory() *Memory {
+ return &Memory{nil}
+}
+
+func (m *Memory) Set(offset, size uint64, value []byte) {
+ if len(value) > 0 {
+ 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("####################")
+}