struct bstr bstr_strip(struct bstr str)
{
str = bstr_lstrip(str);
while (str.len && mp_isspace(str.start[str.len - 1]))
str.len--;
return str;
}
// Skip whitespace and comments (assuming there are no line breaks)
static bool skip_ws(bstr *s)
{
*s = bstr_lstrip(*s);
if (bstr_startswith0(*s, "#"))
s->len = 0;
return s->len;
}
static char *read_quoted(void *talloc_ctx, struct bstr *data)
{
*data = bstr_lstrip(*data);
if (!eat_char(data, '"'))
return NULL;
int end = bstrchr(*data, '"');
if (end < 0)
return NULL;
struct bstr res = bstr_splice(*data, 0, end);
*data = bstr_cut(*data, end + 1);
return bstrto0(talloc_ctx, res);
}
// Read a 2 digit unsigned decimal integer.
// Return -1 on failure.
static int read_int_2(struct bstr *data)
{
*data = bstr_lstrip(*data);
if (data->len && data->start[0] == '-')
return -1;
struct bstr s = *data;
int res = (int)bstrtoll(s, &s, 10);
if (data->len == s.len || data->len - s.len > 2)
return -1;
*data = s;
return res;
}
double bstrtod(struct bstr str, struct bstr *rest)
{
str = bstr_lstrip(str);
char buf[101];
int len = FFMIN(str.len, 100);
memcpy(buf, str.start, len);
buf[len] = 0;
char *endptr;
double r = strtod(buf, &endptr);
if (rest)
*rest = bstr_cut(str, endptr - buf);
return r;
}
long long bstrtoll(struct bstr str, struct bstr *rest, int base)
{
str = bstr_lstrip(str);
char buf[51];
int len = FFMIN(str.len, 50);
memcpy(buf, str.start, len);
buf[len] = 0;
char *endptr;
long long r = strtoll(buf, &endptr, base);
if (rest)
*rest = bstr_cut(str, endptr - buf);
return r;
}
static enum cue_command read_cmd(struct bstr *data, struct bstr *out_params)
{
struct bstr line = bstr_strip_linebreaks(bstr_getline(*data, data));
line = bstr_lstrip(line);
if (line.len == 0)
return CUE_EMPTY;
for (int n = 0; cue_command_strings[n].command != -1; n++) {
struct bstr name = bstr0(cue_command_strings[n].text);
if (bstr_startswith(line, name)) {
struct bstr rest = bstr_cut(line, name.len);
if (rest.len && !strchr(WHITESPACE, rest.start[0]))
continue;
if (out_params)
*out_params = rest;
return cue_command_strings[n].command;
}
}
return CUE_ERROR;
}
static struct bstr read_quoted(struct bstr *data)
{
*data = bstr_lstrip(*data);
if (!eat_char(data, '"'))
return (struct bstr) {0};
int end = bstrchr(*data, '"');
if (end < 0)
return (struct bstr) {0};
struct bstr res = bstr_splice(*data, 0, end);
*data = bstr_cut(*data, end + 1);
return res;
}
// Read a 2 digit unsigned decimal integer.
// Return -1 on failure.
static int read_int_2(struct bstr *data)
{
*data = bstr_lstrip(*data);
if (data->len && data->start[0] == '-')
return -1;
struct bstr s = *data;
int res = (int)bstrtoll(s, &s, 10);
if (data->len == s.len || data->len - s.len > 2)
return -1;
*data = s;
return res;
}
static double read_time(struct bstr *data)
{
struct bstr s = *data;
bool ok = true;
double t1 = read_int_2(&s);
ok = eat_char(&s, ':') && ok;
double t2 = read_int_2(&s);
ok = eat_char(&s, ':') && ok;
double t3 = read_int_2(&s);
ok = ok && t1 >= 0 && t2 >= 0 && t3 >= 0;
return ok ? t1 * 60.0 + t2 + t3 * SECS_PER_CUE_FRAME : 0;
}
static struct bstr skip_utf8_bom(struct bstr data)
{
return bstr_startswith0(data, "\xEF\xBB\xBF") ? bstr_cut(data, 3) : data;
}
// Check if the text in data is most likely CUE data. This is used by the
// demuxer code to check the file type.
// data is the start of the probed file, possibly cut off at a random point.
bool mp_probe_cue(struct bstr data)
{
bool valid = false;
data = skip_utf8_bom(data);
for (;;) {
enum cue_command cmd = read_cmd(&data, NULL);
// End reached. Since the line was most likely cut off, don't use the
// result of the last parsing call.
if (data.len == 0)
break;
if (cmd == CUE_ERROR)
return false;
if (cmd != CUE_EMPTY)
valid = true;
}
return valid;
}