branch update for HEAD-2003050101

[reactos.git] / lib / ntdll / rtl / unicode.c

diff --git a/lib/ntdll/rtl/unicode.c b/lib/ntdll/rtl/unicode.c
index fa0512a..7278792 100644 (file)
--- a/lib/ntdll/rtl/unicode.c
+++ b/lib/ntdll/rtl/unicode.c
@@ -873,6 +873,61 @@ RtlIntegerToUnicodeString(
 }
 
 
+#define ITU_IMPLEMENTED_TESTS (IS_TEXT_UNICODE_ODD_LENGTH|IS_TEXT_UNICODE_SIGNATURE)
+
+ULONG STDCALL
+RtlIsTextUnicode (PVOID Buffer,
+                 ULONG Length,
+                 ULONG *Flags)
+{
+  PWSTR s = Buffer;
+  ULONG in_flags = (ULONG)-1;
+  ULONG out_flags = 0;
+
+  if (Length == 0)
+    goto done;
+
+  if (Flags != 0)
+    in_flags = *Flags;
+
+  /*
+   * Apply various tests to the text string. According to the
+   * docs, each test "passed" sets the corresponding flag in
+   * the output flags. But some of the tests are mutually
+   * exclusive, so I don't see how you could pass all tests ...
+   */
+
+  /* Check for an odd length ... pass if even. */
+  if (!(Length & 1))
+    out_flags |= IS_TEXT_UNICODE_ODD_LENGTH;
+
+  /* Check for the BOM (byte order mark). */
+  if (*s == 0xFEFF)
+    out_flags |= IS_TEXT_UNICODE_SIGNATURE;
+
+#if 0
+  /* Check for the reverse BOM (byte order mark). */
+  if (*s == 0xFFFE)
+    out_flags |= IS_TEXT_UNICODE_REVERSE_SIGNATURE;
+#endif
+
+  /* FIXME: Add more tests */
+
+  /*
+   * Check whether the string passed all of the tests.
+   */
+  in_flags &= ITU_IMPLEMENTED_TESTS;
+  if ((out_flags & in_flags) != in_flags)
+    Length = 0;
+
+done:
+  if (Flags != 0)
+    *Flags = out_flags;
+
+  return Length;
+}
+
+
 NTSTATUS
 STDCALL
 RtlLargeIntegerToChar(