Implement a parser that parses the "Range" HTTP header...

net/http/http_byte_range_unittest.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/http/http_byte_range.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(HttpByteRangeTest, ValidRanges) {
+  const struct {
+    int64 first_byte_position;
+    int64 last_byte_position;
+    int64 suffix_length;
+    bool valid;
+  } tests[] = {
+    {  -1, -1,  0, false },
+    {   0,  0,  0, true  },
+    { -10,  0,  0, false },
+    {  10,  0,  0, false },
+    {  10, -1,  0, true  },
+    {  -1, -1, -1, false },
+    {  -1, 50,  0, false },
+    {  10, 10000, 0, true },
+    {  -1, -1, 100000, true },
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    net::HttpByteRange range;
+    range.set_first_byte_position(tests[i].first_byte_position);
+    range.set_last_byte_position(tests[i].last_byte_position);
+    range.set_suffix_length(tests[i].suffix_length);
+    EXPECT_EQ(tests[i].valid, range.IsValid());
+  }
+}
+
+TEST(HttpByteRangeTest, SetInstanceSize) {
+  const struct {
+    int64 first_byte_position;
+    int64 last_byte_position;
+    int64 suffix_length;
+    int64 instance_size;
+    bool expected_return_value;
+    int64 expected_lower_bound;
+    int64 expected_upper_bound;
+  } tests[] = {
+    { -10,  0,  -1,   0, false,  -1,  -1 },
+    {  10,  0,  -1,   0, false,  -1,  -1 },
+    // Zero instance size is valid, this is the case that user has to handle.
+    {  -1, -1,  -1,   0,  true,   0,  -1 },
+    {  -1, -1, 500,   0,  true,   0,  -1 },
+    {  -1, 50,  -1,   0, false,  -1,  -1 },
+    {  -1, -1, 500, 300,  true,   0, 299 },
+    {  -1, -1,  -1, 100,  true,   0,  99 },
+    {  10, -1,  -1, 100,  true,  10,  99 },
+    {  -1, -1, 500, 1000, true, 500, 999 },
+    {  10, 10000, -1, 1000000, true, 10, 10000 },
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    net::HttpByteRange range;
+    range.set_first_byte_position(tests[i].first_byte_position);
+    range.set_last_byte_position(tests[i].last_byte_position);
+    range.set_suffix_length(tests[i].suffix_length);
+
+    bool return_value = range.ComputeBounds(tests[i].instance_size);
+    EXPECT_EQ(tests[i].expected_return_value, return_value);
+    if (return_value) {
+      EXPECT_EQ(tests[i].expected_lower_bound, range.first_byte_position());
+      EXPECT_EQ(tests[i].expected_upper_bound, range.last_byte_position());
+
+      // Try to call SetInstanceSize the second time.
+      EXPECT_FALSE(range.ComputeBounds(tests[i].instance_size));
+      // And expect there's no side effect.
+      EXPECT_EQ(tests[i].expected_lower_bound, range.first_byte_position());
+      EXPECT_EQ(tests[i].expected_upper_bound, range.last_byte_position());
+      EXPECT_EQ(tests[i].suffix_length, range.suffix_length());
+    }
+  }
+}