add base files

lib/common/base32/base32.go

@@ -0,0 +1,11 @@
+//
+// base32 encoding using i2p's alphabet
+//
+package base32
+
+import (
+  b32 "encoding/base32"
+)
+
+// i2p base32 encoding
+var I2PEncoding *b32.Encoding = b32.NewEncoding("abcdefghijklmnopqrstuvwxyz234567")

lib/common/base64/base64.go

@@ -0,0 +1,11 @@
+//
+// base64 encoding with i2p's alphabet
+//
+package base64
+
+import (
+  b64 "encoding/base64"
+)
+
+// i2p base64 encoding
+var I2PEncoding *b64.Encoding = b64.NewEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-~")

lib/common/data.go

@@ -0,0 +1,5 @@
+package common
+
+
+// the sha256 of some datastructure
+type IdentHash [32]byte

lib/common/utils.go

@@ -0,0 +1,14 @@
+package common
+
+import (
+  "os"
+)
+
+// check if a file is there and writeable
+func FileExists(fname string) (exists bool) {
+  _, err := os.Stat(fname)
+  if err == nil {
+    exists = true
+  }
+  return
+}