summaryrefslogtreecommitdiffstats
path: root/libass/ass_utils.h
blob: 8295d4e09017e56fbeeccf0ed7c993f2ea136c1d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
/*
 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
 *
 * This file is part of libass.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef LIBASS_UTILS_H
#define LIBASS_UTILS_H

#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <math.h>

#include "config.h"

#ifdef CONFIG_ENCA
#include <enca.h>
#endif

#include "ass.h"

#ifndef SIZE_MAX
#define SIZE_MAX ((size_t)-1)
#endif

#define MSGL_FATAL 0
#define MSGL_ERR 1
#define MSGL_WARN 2
#define MSGL_INFO 4
#define MSGL_V 6
#define MSGL_DBG2 7

#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#define FFMINMAX(c,a,b) FFMIN(FFMAX(c, a), b)

#if (defined(__i386__) || defined(__x86_64__)) && CONFIG_ASM
int has_sse2(void);
int has_avx(void);
int has_avx2(void);
#endif

#ifndef HAVE_STRNDUP
char *ass_strndup(const char *s, size_t n);
#define strndup ass_strndup
#endif

void *ass_aligned_alloc(size_t alignment, size_t size);
void ass_aligned_free(void *ptr);

void *ass_realloc_array(void *ptr, size_t nmemb, size_t size);
void *ass_try_realloc_array(void *ptr, size_t nmemb, size_t size);

/**
 * Reallocate the array in ptr to at least count elements. For example, if
 * you do "int *ptr = NULL; ASS_REALLOC_ARRAY(ptr, 5)", you can access ptr[0]
 * through ptr[4] (inclusive).
 *
 * If memory allocation fails, ptr is left unchanged, and the macro returns 0:
 * "if (!ASS_REALLOC_ARRAY(ptr, 5)) goto error;"
 *
 * A count of 0 does not free the array (see ass_realloc_array for remarks).
 */
#define ASS_REALLOC_ARRAY(ptr, count) \
    (errno = 0, (ptr) = ass_try_realloc_array(ptr, count, sizeof(*ptr)), !errno)

void skip_spaces(char **str);
void rskip_spaces(char **str, char *limit);
int mystrtoi(char **p, int *res);
int mystrtoll(char **p, long long *res);
int mystrtod(char **p, double *res);
int mystrtoi32(char **p, int base, int32_t *res);
int32_t parse_alpha_tag(char *str);
uint32_t parse_color_tag(char *str);
uint32_t parse_color_header(char *str);
char *trim_space(char *str);
char *strdup_trimmed(const char *str);
char parse_bool(char *str);
int parse_ycbcr_matrix(char *str);
unsigned ass_utf8_get_char(char **str);
unsigned ass_utf8_put_char(char *dest, uint32_t ch);
void ass_msg(ASS_Library *priv, int lvl, const char *fmt, ...);
int lookup_style(ASS_Track *track, char *name);
ASS_Style *lookup_style_strict(ASS_Track *track, char *name, size_t len);
#ifdef CONFIG_ENCA
void *ass_guess_buffer_cp(ASS_Library *library, unsigned char *buffer,
                          int buflen, char *preferred_language,
                          char *fallback);
#endif

/* defined in ass_strtod.c */
double ass_strtod(const char *string, char **endPtr);

static inline size_t ass_align(size_t alignment, size_t s)
{
    if (s > SIZE_MAX - (alignment - 1))
        return s;
    return (s + (alignment - 1)) & ~(alignment - 1);
}

static inline uint32_t ass_bswap32(uint32_t x)
{
#ifdef _MSC_VER
    return _byteswap_ulong(x);
#else
    return (x & 0x000000FF) << 24 | (x & 0x0000FF00) <<  8 |
           (x & 0x00FF0000) >>  8 | (x & 0xFF000000) >> 24;
#endif
}

static inline int d6_to_int(int x)
{
    return (x + 32) >> 6;
}
static inline int d16_to_int(int x)
{
    return (x + 32768) >> 16;
}
static inline int int_to_d6(int x)
{
    return x * (1 << 6);
}
static inline int int_to_d16(int x)
{
    return x * (1 << 16);
}
static inline int d16_to_d6(int x)
{
    return (x + 512) >> 10;
}
static inline int d6_to_d16(int x)
{
    return x * (1 << 10);
}
static inline double d6_to_double(int x)
{
    return x / 64.;
}
static inline int double_to_d6(double x)
{
    return (int) (x * 64);
}
static inline double d16_to_double(int x)
{
    return ((double) x) / 0x10000;
}
static inline int double_to_d16(double x)
{
    return (int) (x * 0x10000);
}
static inline double d22_to_double(int x)
{
    return ((double) x) / 0x400000;
}
static inline int double_to_d22(double x)
{
    return (int) (x * 0x400000);
}

// Calculate cache key for a rotational angle in radians
static inline int rot_key(double a)
{
    return double_to_d22(remainder(a, 2 * M_PI));
}

#define FNV1_32A_INIT 0x811c9dc5U
#define FNV1_32A_PRIME 16777619U

static inline unsigned fnv_32a_buf(void *buf, size_t len, unsigned hval)
{
    unsigned char *bp = (unsigned char*)buf;
    size_t n = (len + 3) / 4;

    switch (len % 4) {
    case 0: do { hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME;
    case 3:      hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME;
    case 2:      hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME;
    case 1:      hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME;
               } while (--n > 0);
    }

    return hval;
}
static inline unsigned fnv_32a_str(char *str, unsigned hval)
{
    unsigned char *s = (unsigned char *) str;
    while (*s) {
        hval ^= (unsigned) *s++;
        hval *= FNV1_32A_PRIME;
    }
    return hval;
}

#endif                          /* LIBASS_UTILS_H */