Add `b` suffix so we can specify bytes in --bwlimit, --min-size etc

Fixes #449

docs/content/docs.md

@@ -322,13 +322,14 @@ possibly signed sequence of decimal numbers, each with optional
 fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m". Valid
 time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
 
-Options which use SIZE use kByte by default.  However a suffix of `k`
-for kBytes, `M` for MBytes and `G` for GBytes may be used.  These are
-the binary units, eg 2\*\*10, 2\*\*20, 2\*\*30 respectively.
+Options which use SIZE use kByte by default.  However a suffix of `b`
+for bytes, `k` for kBytes, `M` for MBytes and `G` for GBytes may be
+used.  These are the binary units, eg 1, 2\*\*10, 2\*\*20, 2\*\*30
+respectively.
 
 ### --bwlimit=SIZE ###
 
-Bandwidth limit in kBytes/s, or use suffix k|M|G.  The default is `0`
+Bandwidth limit in kBytes/s, or use suffix b|k|M|G.  The default is `0`
 which means to not limit bandwidth.
 
 For example to limit bandwidth usage to 10 MBytes/s use `--bwlimit 10M`

fs/config.go

@@ -94,7 +94,7 @@ var (
 )
 
 func init() {
-	pflag.VarP(&bwLimit, "bwlimit", "", "Bandwidth limit in kBytes/s, or use suffix k|M|G")
+	pflag.VarP(&bwLimit, "bwlimit", "", "Bandwidth limit in kBytes/s, or use suffix b|k|M|G")
 }
 
 // Turn SizeSuffix into a string
@@ -104,6 +104,9 @@ func (x SizeSuffix) String() string {
 	switch {
 	case x == 0:
 		return "0"
+	case x < 1024:
+		scaled = float64(x)
+		suffix = "b"
 	case x < 1024*1024:
 		scaled = float64(x) / 1024
 		suffix = "k"
@@ -132,6 +135,8 @@ func (x *SizeSuffix) Set(s string) error {
 	case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.':
 		suffixLen = 0
 		multiplier = 1 << 10
+	case 'b', 'B':
+		multiplier = 1
 	case 'k', 'K':
 		multiplier = 1 << 10
 	case 'm', 'M':

fs/config_test.go

@@ -12,7 +12,7 @@ func TestSizeSuffixString(t *testing.T) {
 		want string
 	}{
 		{0, "0"},
-		{102, "0.100k"},
+		{102, "102b"},
 		{1024, "1k"},
 		{1024 * 1024, "1M"},
 		{1024 * 1024 * 1024, "1G"},
@@ -34,6 +34,8 @@ func TestSizeSuffixSet(t *testing.T) {
 		err  bool
 	}{
 		{"0", 0, false},
+		{"1b", 1, false},
+		{"102B", 102, false},
 		{"0.1k", 102, false},
 		{"0.1", 102, false},
 		{"1K", 1024, false},

fs/filter.go

@@ -35,8 +35,8 @@ var (
 )
 
 func init() {
-	pflag.VarP(&minSize, "min-size", "", "Don't transfer any file smaller than this in k or suffix k|M|G")
-	pflag.VarP(&maxSize, "max-size", "", "Don't transfer any file larger than this in k or suffix k|M|G")
+	pflag.VarP(&minSize, "min-size", "", "Don't transfer any file smaller than this in k or suffix b|k|M|G")
+	pflag.VarP(&maxSize, "max-size", "", "Don't transfer any file larger than this in k or suffix b|k|M|G")
 }
 
 // rule is one filter rule