mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-27 13:10:37 +00:00
894995c41e
Fixes: [Semmle Security Reports #19439] Fixes: dos_sscanf2.mkv Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
320 lines
11 KiB
C
320 lines
11 KiB
C
/*
|
|
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
|
|
* Copyright (c) 2017 Clément Bœsch <u@pkh.me>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/parseutils.h"
|
|
#include "htmlsubtitles.h"
|
|
#include <ctype.h>
|
|
|
|
static int html_color_parse(void *log_ctx, const char *str)
|
|
{
|
|
uint8_t rgba[4];
|
|
int nb_sharps = 0;
|
|
while (str[nb_sharps] == '#')
|
|
nb_sharps++;
|
|
str += FFMAX(0, nb_sharps - 1);
|
|
if (av_parse_color(rgba, str, strcspn(str, "\" >"), log_ctx) < 0)
|
|
return -1;
|
|
return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
|
|
}
|
|
|
|
static void rstrip_spaces_buf(AVBPrint *buf)
|
|
{
|
|
if (av_bprint_is_complete(buf))
|
|
while (buf->len > 0 && buf->str[buf->len - 1] == ' ')
|
|
buf->str[--buf->len] = 0;
|
|
}
|
|
|
|
/*
|
|
* Fast code for scanning text enclosed in braces. Functionally
|
|
* equivalent to this sscanf call:
|
|
*
|
|
* sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0
|
|
*/
|
|
static int scanbraces(const char* in) {
|
|
if (strncmp(in, "{\\an", 4) != 0) {
|
|
return 0;
|
|
}
|
|
if (!isdigit(in[4])) {
|
|
return 0;
|
|
}
|
|
if (in[5] != '}') {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* skip all {\xxx} substrings except for {\an%d}
|
|
and all microdvd like styles such as {Y:xxx} */
|
|
static void handle_open_brace(AVBPrint *dst, const char **inp, int *an, int *closing_brace_missing)
|
|
{
|
|
const char *in = *inp;
|
|
|
|
*an += scanbraces(in);
|
|
|
|
if (!*closing_brace_missing) {
|
|
if ( (*an != 1 && in[1] == '\\')
|
|
|| (in[1] && strchr("CcFfoPSsYy", in[1]) && in[2] == ':')) {
|
|
char *bracep = strchr(in+2, '}');
|
|
if (bracep) {
|
|
*inp = bracep;
|
|
return;
|
|
} else
|
|
*closing_brace_missing = 1;
|
|
}
|
|
}
|
|
|
|
av_bprint_chars(dst, *in, 1);
|
|
}
|
|
|
|
struct font_tag {
|
|
char face[128];
|
|
int size;
|
|
uint32_t color;
|
|
};
|
|
|
|
/*
|
|
* Fast code for scanning the rest of a tag. Functionally equivalent to
|
|
* this sscanf call:
|
|
*
|
|
* sscanf(in, "%127[^<>]>%n", buffer, lenp) == 2
|
|
*/
|
|
static int scantag(const char* in, char* buffer, int* lenp) {
|
|
int len;
|
|
|
|
for (len = 0; len < 128; len++) {
|
|
const char c = *in++;
|
|
switch (c) {
|
|
case '\0':
|
|
return 0;
|
|
case '<':
|
|
return 0;
|
|
case '>':
|
|
buffer[len] = '\0';
|
|
*lenp = len+1;
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
buffer[len] = c;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The general politic of the convert is to mask unsupported tags or formatting
|
|
* errors (but still alert the user/subtitles writer with an error/warning)
|
|
* without dropping any actual text content for the final user.
|
|
*/
|
|
int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)
|
|
{
|
|
char *param, buffer[128];
|
|
int len, tag_close, sptr = 0, line_start = 1, an = 0, end = 0;
|
|
int closing_brace_missing = 0;
|
|
int i, likely_a_tag;
|
|
|
|
/*
|
|
* state stack is only present for fonts since they are the only tags where
|
|
* the state is not binary. Here is a typical use case:
|
|
*
|
|
* <font color="red" size=10>
|
|
* red 10
|
|
* <font size=50> RED AND BIG </font>
|
|
* red 10 again
|
|
* </font>
|
|
*
|
|
* On the other hand, using the state system for all the tags should be
|
|
* avoided because it breaks wrongly nested tags such as:
|
|
*
|
|
* <b> foo <i> bar </b> bla </i>
|
|
*
|
|
* We don't want to break here; instead, we will treat all these tags as
|
|
* binary state markers. Basically, "<b>" will activate bold, and "</b>"
|
|
* will deactivate it, whatever the current state.
|
|
*
|
|
* This will also prevents cases where we have a random closing tag
|
|
* remaining after the opening one was dropped. Yes, this happens and we
|
|
* still don't want to print a "</b>" at the end of the dialog event.
|
|
*/
|
|
struct font_tag stack[16];
|
|
|
|
memset(&stack[0], 0, sizeof(stack[0]));
|
|
|
|
for (; !end && *in; in++) {
|
|
switch (*in) {
|
|
case '\r':
|
|
break;
|
|
case '\n':
|
|
if (line_start) {
|
|
end = 1;
|
|
break;
|
|
}
|
|
rstrip_spaces_buf(dst);
|
|
av_bprintf(dst, "\\N");
|
|
line_start = 1;
|
|
break;
|
|
case ' ':
|
|
if (!line_start)
|
|
av_bprint_chars(dst, *in, 1);
|
|
break;
|
|
case '{':
|
|
handle_open_brace(dst, &in, &an, &closing_brace_missing);
|
|
break;
|
|
case '<':
|
|
/*
|
|
* "<<" are likely latin guillemets in ASCII or some kind of random
|
|
* style effect; see sub/badsyntax.srt in the FATE samples
|
|
* directory for real test cases.
|
|
*/
|
|
|
|
likely_a_tag = 1;
|
|
for (i = 0; in[1] == '<'; i++) {
|
|
av_bprint_chars(dst, '<', 1);
|
|
likely_a_tag = 0;
|
|
in++;
|
|
}
|
|
|
|
tag_close = in[1] == '/';
|
|
if (tag_close)
|
|
likely_a_tag = 1;
|
|
|
|
av_assert0(in[0] == '<');
|
|
|
|
len = 0;
|
|
|
|
if (scantag(in+tag_close+1, buffer, &len) && len > 0) {
|
|
const int skip = len + tag_close;
|
|
const char *tagname = buffer;
|
|
while (*tagname == ' ') {
|
|
likely_a_tag = 0;
|
|
tagname++;
|
|
}
|
|
if ((param = strchr(tagname, ' ')))
|
|
*param++ = 0;
|
|
|
|
/* Check if this is likely a tag */
|
|
#define LIKELY_A_TAG_CHAR(x) (((x) >= '0' && (x) <= '9') || \
|
|
((x) >= 'a' && (x) <= 'z') || \
|
|
((x) >= 'A' && (x) <= 'Z') || \
|
|
(x) == '_' || (x) == '/')
|
|
for (i = 0; tagname[i]; i++) {
|
|
if (!LIKELY_A_TAG_CHAR(tagname[i])) {
|
|
likely_a_tag = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!av_strcasecmp(tagname, "font")) {
|
|
if (tag_close && sptr > 0) {
|
|
struct font_tag *cur_tag = &stack[sptr--];
|
|
struct font_tag *last_tag = &stack[sptr];
|
|
|
|
if (cur_tag->size) {
|
|
if (!last_tag->size)
|
|
av_bprintf(dst, "{\\fs}");
|
|
else if (last_tag->size != cur_tag->size)
|
|
av_bprintf(dst, "{\\fs%d}", last_tag->size);
|
|
}
|
|
|
|
if (cur_tag->color & 0xff000000) {
|
|
if (!(last_tag->color & 0xff000000))
|
|
av_bprintf(dst, "{\\c}");
|
|
else if (last_tag->color != cur_tag->color)
|
|
av_bprintf(dst, "{\\c&H%"PRIX32"&}", last_tag->color & 0xffffff);
|
|
}
|
|
|
|
if (cur_tag->face[0]) {
|
|
if (!last_tag->face[0])
|
|
av_bprintf(dst, "{\\fn}");
|
|
else if (strcmp(last_tag->face, cur_tag->face))
|
|
av_bprintf(dst, "{\\fn%s}", last_tag->face);
|
|
}
|
|
} else if (!tag_close && sptr < FF_ARRAY_ELEMS(stack) - 1) {
|
|
struct font_tag *new_tag = &stack[sptr + 1];
|
|
|
|
*new_tag = stack[sptr++];
|
|
|
|
while (param) {
|
|
if (!av_strncasecmp(param, "size=", 5)) {
|
|
param += 5 + (param[5] == '"');
|
|
if (sscanf(param, "%u", &new_tag->size) == 1)
|
|
av_bprintf(dst, "{\\fs%u}", new_tag->size);
|
|
} else if (!av_strncasecmp(param, "color=", 6)) {
|
|
int color;
|
|
param += 6 + (param[6] == '"');
|
|
color = html_color_parse(log_ctx, param);
|
|
if (color >= 0) {
|
|
new_tag->color = 0xff000000 | color;
|
|
av_bprintf(dst, "{\\c&H%"PRIX32"&}", new_tag->color & 0xffffff);
|
|
}
|
|
} else if (!av_strncasecmp(param, "face=", 5)) {
|
|
param += 5 + (param[5] == '"');
|
|
len = strcspn(param,
|
|
param[-1] == '"' ? "\"" :" ");
|
|
av_strlcpy(new_tag->face, param,
|
|
FFMIN(sizeof(new_tag->face), len+1));
|
|
param += len;
|
|
av_bprintf(dst, "{\\fn%s}", new_tag->face);
|
|
}
|
|
if ((param = strchr(param, ' ')))
|
|
param++;
|
|
}
|
|
}
|
|
in += skip;
|
|
} else if (tagname[0] && !tagname[1] && strchr("bisu", av_tolower(tagname[0]))) {
|
|
av_bprintf(dst, "{\\%c%d}", (char)av_tolower(tagname[0]), !tag_close);
|
|
in += skip;
|
|
} else if (!av_strncasecmp(tagname, "br", 2) &&
|
|
(!tagname[2] || (tagname[2] == '/' && !tagname[3]))) {
|
|
av_bprintf(dst, "\\N");
|
|
in += skip;
|
|
} else if (likely_a_tag) {
|
|
if (!tag_close) // warn only once
|
|
av_log(log_ctx, AV_LOG_WARNING, "Unrecognized tag %s\n", tagname);
|
|
in += skip;
|
|
} else {
|
|
av_bprint_chars(dst, '<', 1);
|
|
}
|
|
} else {
|
|
av_bprint_chars(dst, *in, 1);
|
|
}
|
|
break;
|
|
default:
|
|
av_bprint_chars(dst, *in, 1);
|
|
break;
|
|
}
|
|
if (*in != ' ' && *in != '\r' && *in != '\n')
|
|
line_start = 0;
|
|
}
|
|
|
|
if (!av_bprint_is_complete(dst))
|
|
return AVERROR(ENOMEM);
|
|
|
|
while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2))
|
|
dst->len -= 2;
|
|
dst->str[dst->len] = 0;
|
|
rstrip_spaces_buf(dst);
|
|
|
|
return 0;
|
|
}
|