Remove unused has_magic.

This will allow inlining get_magic, which should in turn fix one of the mingw
build problems after the switch to std::error_code.

llvm-svn: 210712

llvm/include/llvm/Support/FileSystem.h

@@ -603,14 +603,6 @@ error_code openFileForWrite(const Twine &Name, int &ResultFD, OpenFlags Flags,
 
 error_code openFileForRead(const Twine &Name, int &ResultFD);
 
-/// @brief Are \a path's first bytes \a magic?
-///
-/// @param path Input path.
-/// @param magic Byte sequence to compare \a path's first len(magic) bytes to.
-/// @returns errc::success if result has been successfully set, otherwise a
-///          platform specific error_code.
-error_code has_magic(const Twine &path, const Twine &magic, bool &result);
-
 /// @brief Get \a path's first \a len bytes.
 ///
 /// @param path Input path.

llvm/lib/Support/Path.cpp

@@ -890,24 +890,6 @@ void directory_entry::replace_filename(const Twine &filename, file_status st) {
   Status = st;
 }
 
-error_code has_magic(const Twine &path, const Twine &magic, bool &result) {
-  SmallString<32>  MagicStorage;
-  StringRef Magic = magic.toStringRef(MagicStorage);
-  SmallString<32> Buffer;
-
-  if (error_code ec = get_magic(path, Magic.size(), Buffer)) {
-    if (ec == std::errc::value_too_large) {
-      // Magic.size() > file_size(Path).
-      result = false;
-      return error_code();
-    }
-    return ec;
-  }
-
-  result = Magic == Buffer;
-  return error_code();
-}
-
 /// @brief Identify the magic in magic.
   file_magic identify_magic(StringRef Magic) {
   if (Magic.size() < 4)

llvm/unittests/Support/FileOutputBufferTest.cpp

@@ -46,11 +46,7 @@ TEST(FileOutputBuffer, Test) {
     // Commit buffer.
     ASSERT_NO_ERROR(Buffer->commit());
   }
-  // Verify file exists and starts with special header.
-  bool MagicMatches = false;
-  ASSERT_NO_ERROR(fs::has_magic(Twine(File1), Twine("AABBCCDDEEFFGGHHIIJJ"),
-                                                                MagicMatches));
-  EXPECT_TRUE(MagicMatches);
+
   // Verify file is correct size.
   uint64_t File1Size;
   ASSERT_NO_ERROR(fs::file_size(Twine(File1), File1Size));
@@ -86,11 +82,7 @@ TEST(FileOutputBuffer, Test) {
     // Commit buffer, but size down to smaller size
     ASSERT_NO_ERROR(Buffer->commit(5000));
   }
-  // Verify file exists and starts with special header.
-  bool MagicMatches3 = false;
-  ASSERT_NO_ERROR(fs::has_magic(Twine(File3), Twine("AABBCCDDEEFFGGHHIIJJ"),
-                                                              MagicMatches3));
-  EXPECT_TRUE(MagicMatches3);
+
   // Verify file is correct size.
   uint64_t File3Size;
   ASSERT_NO_ERROR(fs::file_size(Twine(File3), File3Size));

llvm/unittests/Support/Path.cpp

@@ -539,9 +539,6 @@ TEST_F(FileSystemTest, Magic) {
     StringRef magic(i->magic_str, i->magic_str_len);
     file << magic;
     file.close();
-    bool res = false;
-    ASSERT_NO_ERROR(fs::has_magic(file_pathname.c_str(), magic, res));
-    EXPECT_TRUE(res);
     EXPECT_EQ(i->magic, fs::identify_magic(magic));
     ASSERT_NO_ERROR(fs::remove(Twine(file_pathname)));
   }