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sd_ass: fix some corner cases in tag stripping 

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This commit is contained in:
wm4 2015-02-12 12:18:19 +01:00
parent 7bbc617019
commit 545a0e59df
1 changed files with 14 additions and 5 deletions
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19
sub/sd_ass.c
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@ -181,6 +181,7 @@ static void append(struct buf *b, char c)
static void ass_to_plaintext(struct buf *b, const char *in)
{
bool in_tag = false;
const char *open_tag_pos = NULL;
bool in_drawing = false;
while (*in) {
if (in_tag) {
@ -189,11 +190,13 @@ static void ass_to_plaintext(struct buf *b, const char *in)
in_tag = false;
} else if (in[0] == '\\' && in[1] == 'p') {
in += 2;
// skip text between \pN and \p0 tags
if (in[0] == '0') {
in_drawing = false;
} else if (in[0] >= '1' && in[0] <= '9') {
in_drawing = true;
// Skip text between \pN and \p0 tags. A \p without a number
// is the same as \p0, and leading 0s are also allowed.
in_drawing = false;
while (in[0] >= '0' && in[0] <= '9') {
if (in[0] != '0')
in_drawing = true;
in += 1;
}
} else {
in += 1;
@ -206,6 +209,7 @@ static void ass_to_plaintext(struct buf *b, const char *in)
in += 2;
append(b, ' ');
} else if (in[0] == '{') {
open_tag_pos = in;
in += 1;
in_tag = true;
} else {
@ -215,6 +219,11 @@ static void ass_to_plaintext(struct buf *b, const char *in)
}
}
}
// A '{' without a closing '}' is always visible.
if (in_tag) {
while (*open_tag_pos)
append(b, *open_tag_pos++);
}
}
// Empty string counts as whitespace. Reads s[len-1] even if there are \0s.