From 7d2407571d8c8851b67af5ddd0429467c7048b16 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Wed, 13 Jun 2018 11:48:07 +0200
Subject: Remember the md5 digest in the fz_font struct.

---
 source/fitz/font-imp.h |  4 ++++
 source/fitz/font.c     | 12 ++++++++++++
 2 files changed, 16 insertions(+)

(limited to 'source/fitz')

diff --git a/source/fitz/font-imp.h b/source/fitz/font-imp.h
index 74a25ccf..f121923c 100644
--- a/source/fitz/font-imp.h
+++ b/source/fitz/font-imp.h
@@ -39,6 +39,10 @@ struct fz_font_s
 
 	/* cached encoding lookup */
 	uint16_t *encoding_cache[256];
+
+	/* cached md5sum for caching */
+	int has_digest;
+	unsigned char digest[16];
 };
 
 #endif
diff --git a/source/fitz/font.c b/source/fitz/font.c
index 2075306e..c39174ee 100644
--- a/source/fitz/font.c
+++ b/source/fitz/font.c
@@ -1814,3 +1814,15 @@ fz_shaper_data_t *fz_font_shaper_data(fz_context *ctx, fz_font *font)
 {
 	return font ? &font->shaper_data : NULL;
 }
+
+void fz_font_digest(fz_context *ctx, fz_font *font, unsigned char digest[16])
+{
+	if (!font->buffer)
+		fz_throw(ctx, FZ_ERROR_GENERIC, "no font file for digest");
+	if (!font->has_digest)
+	{
+		fz_md5_buffer(ctx, font->buffer, font->digest);
+		font->has_digest = 1;
+	}
+	memcpy(digest, font->digest, 16);
+}
-- 
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