initial commit

Signed-off-by: Derek McQuay <derekmcquay@gmail.com>

vendor/cloud.google.com/go/storage/reader_test.go

@@ -0,0 +1,112 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strconv"
+	"strings"
+	"testing"
+
+	"golang.org/x/net/context"
+	"google.golang.org/api/option"
+)
+
+const readData = "0123456789"
+
+func TestRangeReader(t *testing.T) {
+	hc, close := newTestServer(handleRangeRead)
+	defer close()
+	ctx := context.Background()
+	c, err := NewClient(ctx, option.WithHTTPClient(hc))
+	if err != nil {
+		t.Fatal(err)
+	}
+	obj := c.Bucket("b").Object("o")
+	for _, test := range []struct {
+		offset, length int64
+		want           string
+	}{
+		{0, -1, readData},
+		{0, 10, readData},
+		{0, 5, readData[:5]},
+		{1, 3, readData[1:4]},
+		{6, -1, readData[6:]},
+		{4, 20, readData[4:]},
+	} {
+		r, err := obj.NewRangeReader(ctx, test.offset, test.length)
+		if err != nil {
+			t.Errorf("%d/%d: %v", test.offset, test.length, err)
+			continue
+		}
+		gotb, err := ioutil.ReadAll(r)
+		if err != nil {
+			t.Errorf("%d/%d: %v", test.offset, test.length, err)
+			continue
+		}
+		if got := string(gotb); got != test.want {
+			t.Errorf("%d/%d: got %q, want %q", test.offset, test.length, got, test.want)
+		}
+	}
+}
+
+func handleRangeRead(w http.ResponseWriter, r *http.Request) {
+	rh := strings.TrimSpace(r.Header.Get("Range"))
+	data := readData
+	var from, to int
+	if rh == "" {
+		from = 0
+		to = len(data)
+	} else {
+		// assume "bytes=N-" or "bytes=N-M"
+		var err error
+		i := strings.IndexRune(rh, '=')
+		j := strings.IndexRune(rh, '-')
+		from, err = strconv.Atoi(rh[i+1 : j])
+		if err != nil {
+			w.WriteHeader(500)
+			return
+		}
+		to = len(data)
+		if j+1 < len(rh) {
+			to, err = strconv.Atoi(rh[j+1:])
+			if err != nil {
+				w.WriteHeader(500)
+				return
+			}
+			to++ // Range header is inclusive, Go slice is exclusive
+		}
+		if from >= len(data) && to != from {
+			w.WriteHeader(416)
+			return
+		}
+		if from > len(data) {
+			from = len(data)
+		}
+		if to > len(data) {
+			to = len(data)
+		}
+	}
+	data = data[from:to]
+	if data != readData {
+		w.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", from, to-1, len(readData)))
+		w.WriteHeader(http.StatusPartialContent)
+	}
+	if _, err := w.Write([]byte(data)); err != nil {
+		panic(err)
+	}
+}