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From 7f5ccdee1f8a990e1cd675bd1a7ab4673e797f46 Mon Sep 17 00:00:00 2001
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Message-Id: <7f5ccdee1f8a990e1cd675bd1a7ab4673e797f46.1542275308.git.mjg@fedoraproject.org>
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From: Tor Andersson <tor.andersson@artifex.com>
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Date: Wed, 7 Nov 2018 19:46:54 +0100
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Subject: [PATCH] Write placeholder appearance streams for digital signatures.
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A proper appearance stream is written when signing with a certificate.
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This is just to create a placeholder appearance when the original document
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did not write one.
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---
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source/pdf/pdf-appearance.c | 23 +++++++++++++++++++++++
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1 file changed, 23 insertions(+)
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diff --git a/source/pdf/pdf-appearance.c b/source/pdf/pdf-appearance.c
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index ceadfd09..c18d5860 100644
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--- a/source/pdf/pdf-appearance.c
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+++ b/source/pdf/pdf-appearance.c
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@@ -1066,6 +1066,25 @@ pdf_write_ch_widget_appearance(fz_context *ctx, pdf_annot *annot, fz_buffer *buf
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pdf_write_tx_widget_appearance(ctx, annot, buf, rect, bbox, matrix, res, text, ff);
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}
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+static void
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+pdf_write_sig_widget_appearance(fz_context *ctx, pdf_annot *annot, fz_buffer *buf,
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+ fz_rect *rect, fz_rect *bbox, fz_matrix *matrix, pdf_obj **res)
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+{
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+ float x0 = rect->x0 + 1;
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+ float y0 = rect->y0 + 1;
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+ float x1 = rect->x1 - 1;
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+ float y1 = rect->y1 - 1;
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+ float w = x1 - x0;
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+ float h = y1 - y0;
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+ fz_append_printf(ctx, buf, "1 w\n0 G\n");
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+ fz_append_printf(ctx, buf, "%g %g %g %g re\n", x0, y0, w, h);
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+ fz_append_printf(ctx, buf, "%g %g m %g %g l\n", x0, y0, x1, y1);
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+ fz_append_printf(ctx, buf, "%g %g m %g %g l\n", x1, y0, x0, y1);
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+ fz_append_printf(ctx, buf, "s\n");
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+ *bbox = *rect;
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+ *matrix = fz_identity;
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+}
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+
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static void
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pdf_write_widget_appearance(fz_context *ctx, pdf_annot *annot, fz_buffer *buf,
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fz_rect *rect, fz_rect *bbox, fz_matrix *matrix, pdf_obj **res)
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@@ -1115,6 +1134,10 @@ pdf_write_widget_appearance(fz_context *ctx, pdf_annot *annot, fz_buffer *buf,
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fz_catch(ctx)
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fz_rethrow(ctx);
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}
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+ else if (pdf_name_eq(ctx, ft, PDF_NAME(Sig)))
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+ {
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+ pdf_write_sig_widget_appearance(ctx, annot, buf, rect, bbox, matrix, res);
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+ }
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else
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{
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot create appearance stream for %s widgets", pdf_to_name(ctx, ft));
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--
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2.19.1.1238.g4b45f61cc0
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