mirror of https://git.ffmpeg.org/ffmpeg.git
tools: add ffescape utility
This commit is contained in:
Stefano Sabatini
parent
04a585f054
commit
15f52e50fe
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@ -55,6 +55,7 @@
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/tools/ffbisect
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/tools/bisect.need
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/tools/cws2fws
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/tools/ffescape
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/tools/ffeval
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/tools/graph2dot
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/tools/ismindex
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@ -16,6 +16,7 @@ version <next>:
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- subtitles raw text decoder
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- support for building DLLs using MSVC
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- LVF demuxer
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- ffescape tool
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version 1.0:
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@ -131,6 +131,6 @@ TESTPROGS = adler32 \
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TESTPROGS-$(HAVE_LZO1X_999_COMPRESS) += lzo
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TOOLS = ffeval
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TOOLS = ffeval ffescape
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$(SUBDIR)lzo-test$(EXESUF): ELIBS = -llzo2
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@ -0,0 +1,233 @@
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/*
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#if HAVE_UNISTD_H
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#include <unistd.h> /* getopt */
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#endif
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#include "libavutil/log.h"
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#include "libavutil/bprint.h"
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#if !HAVE_GETOPT
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#include "compat/getopt.c"
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#endif
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/**
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* @file
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* escaping utility
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*/
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static void usage(void)
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{
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printf("Escape an input string, adopting the av_get_token() escaping logic\n");
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printf("usage: ffescape [OPTIONS]\n");
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printf("\n"
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"Options:\n"
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"-e echo each input line on output\n"
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"-h print this help\n"
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"-i INFILE set INFILE as input file, stdin if omitted\n"
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"-l LEVEL set the number of escaping levels, 1 if omitted\n"
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"-m ESCAPE_MODE select escape mode between 'full', 'lazy', 'quote', default is 'lazy'\n"
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"-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
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"-p PROMPT set output prompt, is '=> ' by default\n"
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"-s SPECIAL_CHARS set the list of special characters\n");
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}
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#define WHITESPACES " \n\t"
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enum EscapeMode {
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ESCAPE_MODE_FULL,
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ESCAPE_MODE_LAZY,
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ESCAPE_MODE_QUOTE,
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};
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static int escape(char **dst, const char *src, const char *special_chars,
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enum EscapeMode mode)
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{
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AVBPrint dstbuf;
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av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
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switch (mode) {
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case ESCAPE_MODE_FULL:
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case ESCAPE_MODE_LAZY:
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/* \-escape characters */
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if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, *src))
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av_bprintf(&dstbuf, "\\%c", *src++);
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for (; *src; src++) {
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if ((special_chars && strchr(special_chars, *src)) ||
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strchr("'\\", *src) ||
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(mode == ESCAPE_MODE_FULL && strchr(WHITESPACES, *src)))
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av_bprintf(&dstbuf, "\\%c", *src);
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else
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av_bprint_chars(&dstbuf, *src, 1);
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}
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if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, dstbuf.str[dstbuf.len-1])) {
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char c = dstbuf.str[dstbuf.len-1];
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dstbuf.str[dstbuf.len-1] = '\\';
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av_bprint_chars(&dstbuf, c, 1);
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}
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break;
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case ESCAPE_MODE_QUOTE:
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/* enclose between '' the string */
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av_bprint_chars(&dstbuf, '\'', 1);
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for (; *src; src++) {
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if (*src == '\'')
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av_bprintf(&dstbuf, "'\\''");
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else
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av_bprint_chars(&dstbuf, *src, 1);
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}
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av_bprint_chars(&dstbuf, '\'', 1);
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break;
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default:
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/* unknown escape mode */
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return AVERROR(EINVAL);
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}
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if (!av_bprint_is_complete(&dstbuf)) {
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av_bprint_finalize(&dstbuf, NULL);
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return AVERROR(ENOMEM);
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} else {
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av_bprint_finalize(&dstbuf, dst);
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return 0;
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}
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}
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int main(int argc, char **argv)
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{
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AVBPrint src;
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char *src_buf, *dst_buf;
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const char *outfilename = NULL, *infilename = NULL;
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FILE *outfile = NULL, *infile = NULL;
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const char *prompt = "=> ";
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enum EscapeMode escape_mode = ESCAPE_MODE_LAZY;
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int level = 1;
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int echo = 0;
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char *special_chars = NULL;
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int c;
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while ((c = getopt(argc, argv, "ehi:l:o:m:p:s:")) != -1) {
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switch (c) {
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case 'e':
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echo = 1;
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break;
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case 'h':
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usage();
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return 0;
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case 'i':
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infilename = optarg;
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break;
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case 'l':
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{
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char *tail;
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long int li = strtol(optarg, &tail, 10);
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if (*tail || li > INT_MAX || li < 0) {
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av_log(NULL, AV_LOG_ERROR,
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"Invalid value '%s' for option -l, argument must be a non negative integer\n",
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optarg);
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return 1;
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}
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level = li;
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break;
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}
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case 'm':
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if (!strcmp(optarg, "full")) escape_mode = ESCAPE_MODE_FULL;
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else if (!strcmp(optarg, "lazy")) escape_mode = ESCAPE_MODE_LAZY;
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else if (!strcmp(optarg, "quote")) escape_mode = ESCAPE_MODE_QUOTE;
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else {
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av_log(NULL, AV_LOG_ERROR,
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"Invalid value '%s' for option -m, "
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"valid arguments are 'full', 'lazy', 'quote'\n", optarg);
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return 1;
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}
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break;
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case 'o':
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outfilename = optarg;
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break;
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case 'p':
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prompt = optarg;
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break;
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case 's':
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special_chars = optarg;
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break;
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case '?':
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return 1;
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}
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}
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if (!infilename || !strcmp(infilename, "-")) {
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infilename = "stdin";
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infile = stdin;
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} else {
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infile = fopen(infilename, "r");
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}
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if (!infile) {
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av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
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return 1;
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}
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if (!outfilename || !strcmp(outfilename, "-")) {
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outfilename = "stdout";
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outfile = stdout;
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} else {
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outfile = fopen(outfilename, "w");
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}
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if (!outfile) {
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av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
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return 1;
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}
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/* grab the input and store it in src */
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av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED);
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while ((c = fgetc(infile)) != EOF)
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av_bprint_chars(&src, c, 1);
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av_bprint_chars(&src, 0, 1);
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if (!av_bprint_is_complete(&src)) {
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av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n");
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av_bprint_finalize(&src, NULL);
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return 1;
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}
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av_bprint_finalize(&src, &src_buf);
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if (echo)
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fprintf(outfile, "%s", src_buf);
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/* escape */
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dst_buf = src_buf;
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while (level--) {
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if (escape(&dst_buf, src_buf, special_chars, escape_mode) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Could not escape string\n");
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return 1;
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}
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av_free(src_buf);
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src_buf = dst_buf;
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}
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fprintf(outfile, "%s%s", prompt, dst_buf);
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av_free(dst_buf);
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return 0;
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}
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