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51 lines
1.8 KiB
51 lines
1.8 KiB
From 93ebf942a90f9c95797838f9adab94bc0378671c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
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Date: Tue, 30 Apr 2019 16:36:09 +0200
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Subject: [PATCH] Avoid crash on toc.ncx navPoint without navLabel
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Althoug at least one navLabel is required per navPoint, there is no
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guarantee it actually exists.
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Avoid crashes due to invalid accesses of a null label in case the toc is
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broken, and spew a warning.
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Fixes #8 epub_tit_next crashes on navPoint without navLabel.
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---
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src/libepub/epub.c | 5 +++--
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src/libepub/opf.c | 4 ++++
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2 files changed, 7 insertions(+), 2 deletions(-)
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diff --git a/src/libepub/epub.c b/src/libepub/epub.c
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index d085503..a259d9d 100644
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--- a/src/libepub/epub.c
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+++ b/src/libepub/epub.c
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@@ -469,8 +469,9 @@ int epub_tit_next(struct titerator *tit) {
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case TITERATOR_NAVMAP:
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case TITERATOR_PAGES:
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ti = GetNodeData(curr);
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- tit->cache.label =
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- (char *)_opf_label_get_by_doc_lang(tit->epub->opf, ti->label);
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+ if (ti->label)
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+ tit->cache.label =
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+ (char *)_opf_label_get_by_doc_lang(tit->epub->opf, ti->label);
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if (! tit->cache.label)
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tit->cache.label = (char *)ti->id;
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diff --git a/src/libepub/opf.c b/src/libepub/opf.c
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index 6851db2..09bce9e 100644
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--- a/src/libepub/opf.c
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+++ b/src/libepub/opf.c
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@@ -398,6 +398,10 @@ void _opf_parse_navmap(struct opf *opf, xmlTextReaderPtr reader) {
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} else if (xmlTextReaderNodeType(reader) == 15) {
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if (item) {
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+ if (! item->label) {
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+ _epub_print_debug(opf->epub, DEBUG_WARNING,
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+ "- missing navlabel for nav point element");
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+ }
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_epub_print_debug(opf->epub, DEBUG_INFO,
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"adding nav point item->%s %s (d:%d,p:%d)",
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item->id, item->src, item->depth, item->playOrder);
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--
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2.21.0
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