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