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diff --git a/source/fitz/bidi-imp.h b/source/fitz/bidi-imp.h
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+/*  For use with Bidi Reference Implementation
+    For more information see the associated file bidi-std.c
+
+    Credits:
+    -------
+    Written by: Asmus Freytag
+    Command line interface by: Rick McGowan
+    Verification (v24): Doug Felt
+
+    Disclaimer and legal rights:
+    ---------------------------
+    Copyright (C) 1999-2009, ASMUS, Inc. All Rights Reserved.
+    Distributed under the Terms of Use in http://www.unicode.org/copyright.html.
+
+    THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+    IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
+    BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
+    OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+    WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE SOFTWARE.
+*/
+
+/* Bidirectional Character Types
+ * as defined by the Unicode Bidirectional Algorithm Table 3-7.
+ * The list of bidirectional character types here is not grouped the
+ * same way as the table 3-7, since the numeric values for the types
+ * are chosen to keep the state and action tables compact.
+ */
+enum
+{
+	/* input types */
+			/* ON MUST be zero, code relies on ON = N = 0 */
+	BDI_ON = 0,	/* Other Neutral  */
+	BDI_L,		/* Left-to-right Letter */
+	BDI_R,		/* Right-to-left Letter */
+	BDI_AN,		/* Arabic Number */
+	BDI_EN,		/* European Number */
+	BDI_AL,		/* Arabic Letter (Right-to-left) */
+	BDI_NSM,	/* Non-spacing Mark */
+	BDI_CS,		/* Common Separator */
+	BDI_ES,		/* European Separator */
+	BDI_ET,		/* European Terminator (post/prefix e.g. $ and %) */
+
+	/* resolved types */
+	BDI_BN,		/* Boundary neutral (type of RLE etc after explicit levels)*/
+
+	/* input types, */
+	BDI_S,		/* Segment Separator (TAB)	used only in L1 */
+	BDI_WS,		/* White space			used only in L1 */
+	BDI_B,		/* Paragraph Separator (aka as PS) */
+
+	/* types for explicit controls */
+	BDI_RLO,	/* these are used only in X1-X9 */
+	BDI_RLE,
+	BDI_LRO,
+	BDI_LRE,
+	BDI_PDF,
+
+	/* resolved types, also resolved directions */
+	BDI_N = BDI_ON	/* alias, where ON, WS and S are treated the same */
+};
+
+typedef int fz_bidi_level; /* Note: Max level is 125 */
+typedef uint8_t fz_bidi_chartype;
+
+enum
+{
+	BIDI_LEVEL_MAX = 125 /* Updated for 6.3.0 */
+};
+
+void fz_bidi_resolve_neutrals(fz_bidi_level baselevel, fz_bidi_chartype *pcls, const fz_bidi_level *plevel, size_t cch);
+void fz_bidi_resolve_implicit(const fz_bidi_chartype *pcls, fz_bidi_level *plevel, size_t cch);
+void fz_bidi_resolve_weak(fz_context *ctx, fz_bidi_level baselevel, fz_bidi_chartype *pcls, fz_bidi_level *plevel, size_t cch);
+void fz_bidi_resolve_whitespace(fz_bidi_level baselevel, const fz_bidi_chartype *pcls, fz_bidi_level *plevel, size_t cch);
+size_t fz_bidi_resolve_explicit(fz_bidi_level level, fz_bidi_chartype dir, fz_bidi_chartype *pcls, fz_bidi_level *plevel, size_t cch, fz_bidi_level nNest);