Remove some duplicate code in quic tests.

net/quic/crypto/channel_id_test.cc

Index: net/quic/crypto/channel_id_test.cc
diff --git a/net/quic/crypto/channel_id_test.cc b/net/quic/crypto/channel_id_test.cc
index d29bfced05954d9082d631b7592449f02d553d07..48319ec334b4e0a27b2272447c05bd45add70ccc 100644
--- a/net/quic/crypto/channel_id_test.cc
+++ b/net/quic/crypto/channel_id_test.cc
@@ -5,6 +5,7 @@
 #include "net/quic/crypto/channel_id.h"
 
 #include "net/quic/test_tools/crypto_test_utils.h"
+#include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::StringPiece;
@@ -185,85 +186,36 @@ const TestVector test_vector[] = {
   { NULL }
 };
 
-// Returns true if |ch| is a lowercase hexadecimal digit.
-bool IsHexDigit(char ch) {
-  return ('0' <= ch && ch <= '9') || ('a' <= ch && ch <= 'f');
-}
-
-// Converts a lowercase hexadecimal digit to its integer value.
-int HexDigitToInt(char ch) {
-  if ('0' <= ch && ch <= '9') {
-    return ch - '0';
-  }
-  return ch - 'a' + 10;
-}
-
-// |in| is a string consisting of lowercase hexadecimal digits, where
-// every two digits represent one byte. |out| is a buffer of size |max_len|.
-// Converts |in| to bytes and stores the bytes in the |out| buffer. The
-// number of bytes converted is returned in |*out_len|. Returns true on
-// success, false on failure.
-bool DecodeHexString(const char* in,
-                     char* out,
-                     size_t* out_len,
-                     size_t max_len) {
-  if (!in) {
-    *out_len = (size_t)-1;
-    return true;
-  }
-  *out_len = 0;
-  while (*in != '\0') {
-    if (!IsHexDigit(*in) || !IsHexDigit(*(in + 1))) {
-      return false;
-    }
-    if (*out_len >= max_len) {
-      return false;
-    }
-    out[*out_len] = HexDigitToInt(*in) * 16 + HexDigitToInt(*(in + 1));
-    (*out_len)++;
-    in += 2;
-  }
-  return true;
-}
-
 }  // namespace
 
 // A known answer test for ChannelIDVerifier.
 TEST(ChannelIDTest, VerifyKnownAnswerTest) {
-  char msg[1024];
-  size_t msg_len;
-  char key[64];
-  size_t qx_len;
-  size_t qy_len;
-  char signature[64];
-  size_t r_len;
-  size_t s_len;
+  string msg;
+  string qx;
+  string qy;
+  string r;
+  string s;
 
   for (size_t i = 0; test_vector[i].msg != NULL; i++) {
     SCOPED_TRACE(i);
     // Decode the test vector.
-    ASSERT_TRUE(
-        DecodeHexString(test_vector[i].msg, msg, &msg_len, sizeof(msg)));
-    ASSERT_TRUE(DecodeHexString(test_vector[i].qx, key, &qx_len, sizeof(key)));
-    ASSERT_TRUE(DecodeHexString(test_vector[i].qy, key + qx_len, &qy_len,
-                                sizeof(key) - qx_len));
-    ASSERT_TRUE(DecodeHexString(test_vector[i].r, signature, &r_len,
-                                sizeof(signature)));
-    ASSERT_TRUE(DecodeHexString(test_vector[i].s, signature + r_len, &s_len,
-                                sizeof(signature) - r_len));
+    ASSERT_TRUE(DecodeHexString(test_vector[i].msg, &msg));
+    ASSERT_TRUE(DecodeHexString(test_vector[i].qx, &qx));
+    ASSERT_TRUE(DecodeHexString(test_vector[i].qy, &qy));
+    ASSERT_TRUE(DecodeHexString(test_vector[i].r, &r));
+    ASSERT_TRUE(DecodeHexString(test_vector[i].s, &s));
+
+    string key = qx + qy;
+    string signature = r + s;
 
     // The test vector's lengths should look sane.
-    EXPECT_EQ(sizeof(key) / 2, qx_len);
-    EXPECT_EQ(sizeof(key) / 2, qy_len);
-    EXPECT_EQ(sizeof(signature) / 2, r_len);
-    EXPECT_EQ(sizeof(signature) / 2, s_len);
+    EXPECT_EQ(32u, qx.size());
+    EXPECT_EQ(32u, qy.size());
+    EXPECT_EQ(32u, r.size());
+    EXPECT_EQ(32u, s.size());
 
     EXPECT_EQ(test_vector[i].result,
-              ChannelIDVerifier::VerifyRaw(
-                  StringPiece(key, sizeof(key)),
-                  StringPiece(msg, msg_len),
-                  StringPiece(signature, sizeof(signature)),
-                  false));
+              ChannelIDVerifier::VerifyRaw(key, msg, signature, false));
   }
 }