1/* grabbag - Convenience lib for various routines common to several tools
2 * Copyright (C) 2002,2003,2004,2005,2006,2007  Josh Coalson
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18
19#if HAVE_CONFIG_H
20#  include <config.h>
21#endif
22
23#include "share/grabbag.h"
24#include "FLAC/assert.h"
25#include <stdlib.h> /* for atoi() */
26#include <string.h>
27
28#ifdef _MSC_VER
29/* There's no strtoll() in MSVC6 so we just write a specialized one */
30static FLAC__int64 local__strtoll(const char *src, char **endptr)
31{
32	FLAC__bool neg = false;
33	FLAC__int64 ret = 0;
34	int c;
35	FLAC__ASSERT(0 != src);
36	if(*src == '-') {
37		neg = true;
38		src++;
39	}
40	while(0 != (c = *src)) {
41		c -= '0';
42		if(c >= 0 && c <= 9)
43			ret = (ret * 10) + c;
44		else
45			break;
46		src++;
47	}
48	if(endptr)
49		*endptr = (char*)src;
50	return neg? -ret : ret;
51}
52#endif
53
54FLAC__bool grabbag__seektable_convert_specification_to_template(const char *spec, FLAC__bool only_explicit_placeholders, FLAC__uint64 total_samples_to_encode, unsigned sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
55{
56	unsigned i;
57	const char *pt;
58
59	FLAC__ASSERT(0 != spec);
60	FLAC__ASSERT(0 != seektable_template);
61	FLAC__ASSERT(seektable_template->type = FLAC__METADATA_TYPE_SEEKTABLE);
62
63	if(0 != spec_has_real_points)
64		*spec_has_real_points = false;
65
66	for(pt = spec, i = 0; pt && *pt; i++) {
67		const char *q = strchr(pt, ';');
68		FLAC__ASSERT(0 != q);
69
70		if(q > pt) {
71			if(0 == strncmp(pt, "X;", 2)) { /* -S X */
72				if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
73					return false;
74			}
75			else if(q[-1] == 'x') { /* -S #x */
76				if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
77					if(0 != spec_has_real_points)
78						*spec_has_real_points = true;
79					if(!only_explicit_placeholders) {
80						const int n = (unsigned)atoi(pt);
81						if(n > 0)
82							if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (unsigned)n, total_samples_to_encode))
83								return false;
84					}
85				}
86			}
87			else if(q[-1] == 's') { /* -S #s */
88				if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
89					FLAC__ASSERT(sample_rate > 0);
90					if(0 != spec_has_real_points)
91						*spec_has_real_points = true;
92					if(!only_explicit_placeholders) {
93						const double sec = atof(pt);
94						if(sec > 0.0) {
95							unsigned samples = (unsigned)(sec * (double)sample_rate);
96							if(samples > 0) {
97								/* +1 for the initial point at sample 0 */
98								if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
99									return false;
100							}
101						}
102					}
103				}
104			}
105			else { /* -S # */
106				if(0 != spec_has_real_points)
107					*spec_has_real_points = true;
108				if(!only_explicit_placeholders) {
109					char *endptr;
110#ifdef _MSC_VER
111					const FLAC__int64 n = local__strtoll(pt, &endptr);
112#else
113					const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
114#endif
115					if(
116						(n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
117						(total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
118					)
119						if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
120							return false;
121				}
122			}
123		}
124
125		pt = ++q;
126	}
127
128	if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
129		return false;
130
131	return true;
132}
133