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Diffstat (limited to 'contrib/ffmpeg/libavformat/cutils.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/cutils.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/cutils.c b/contrib/ffmpeg/libavformat/cutils.c new file mode 100644 index 000000000..45959ec39 --- /dev/null +++ b/contrib/ffmpeg/libavformat/cutils.c @@ -0,0 +1,275 @@ +/* + * Various simple utilities for ffmpeg system + * Copyright (c) 2000, 2001, 2002 Fabrice Bellard + * + * 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 "avformat.h" + +#if !defined(CONFIG_NOCUTILS) +/** + * Return TRUE if val is a prefix of str. If it returns TRUE, ptr is + * set to the next character in 'str' after the prefix. + * + * @param str input string + * @param val prefix to test + * @param ptr updated after the prefix in str in there is a match + * @return TRUE if there is a match + */ +int strstart(const char *str, const char *val, const char **ptr) +{ + const char *p, *q; + p = str; + q = val; + while (*q != '\0') { + if (*p != *q) + return 0; + p++; + q++; + } + if (ptr) + *ptr = p; + return 1; +} + +/** + * Return TRUE if val is a prefix of str (case independent). If it + * returns TRUE, ptr is set to the next character in 'str' after the + * prefix. + * + * @param str input string + * @param val prefix to test + * @param ptr updated after the prefix in str in there is a match + * @return TRUE if there is a match */ +int stristart(const char *str, const char *val, const char **ptr) +{ + const char *p, *q; + p = str; + q = val; + while (*q != '\0') { + if (toupper(*(const unsigned char *)p) != toupper(*(const unsigned char *)q)) + return 0; + p++; + q++; + } + if (ptr) + *ptr = p; + return 1; +} + +/** + * Copy the string str to buf. If str length is bigger than buf_size - + * 1 then it is clamped to buf_size - 1. + * NOTE: this function does what strncpy should have done to be + * useful. NEVER use strncpy. + * + * @param buf destination buffer + * @param buf_size size of destination buffer + * @param str source string + */ +void pstrcpy(char *buf, int buf_size, const char *str) +{ + int c; + char *q = buf; + + if (buf_size <= 0) + return; + + for(;;) { + c = *str++; + if (c == 0 || q >= buf + buf_size - 1) + break; + *q++ = c; + } + *q = '\0'; +} + +/* strcat and truncate. */ +char *pstrcat(char *buf, int buf_size, const char *s) +{ + int len; + len = strlen(buf); + if (len < buf_size) + pstrcpy(buf + len, buf_size - len, s); + return buf; +} + +#endif + +/* add one element to a dynamic array */ +void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem) +{ + int nb, nb_alloc; + unsigned long *tab; + + nb = *nb_ptr; + tab = *tab_ptr; + if ((nb & (nb - 1)) == 0) { + if (nb == 0) + nb_alloc = 1; + else + nb_alloc = nb * 2; + tab = av_realloc(tab, nb_alloc * sizeof(unsigned long)); + *tab_ptr = tab; + } + tab[nb++] = elem; + *nb_ptr = nb; +} + +time_t mktimegm(struct tm *tm) +{ + time_t t; + + int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday; + + if (m < 3) { + m += 12; + y--; + } + + t = 86400 * + (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469); + + t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec; + + return t; +} + +#define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0)) +#define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400) + +/* this is our own gmtime_r. it differs from its POSIX counterpart in a + couple of places, though. */ +struct tm *brktimegm(time_t secs, struct tm *tm) +{ + int days, y, ny, m; + int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; + + days = secs / 86400; + secs %= 86400; + tm->tm_hour = secs / 3600; + tm->tm_min = (secs % 3600) / 60; + tm->tm_sec = secs % 60; + + /* oh well, may be someone some day will invent a formula for this stuff */ + y = 1970; /* start "guessing" */ + while (days >= (ISLEAP(y)?366:365)) { + ny = (y + days/366); + days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1); + y = ny; + } + md[1] = ISLEAP(y)?29:28; + for (m=0; days >= md[m]; m++) + days -= md[m]; + + tm->tm_year = y; /* unlike gmtime_r we store complete year here */ + tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */ + tm->tm_mday = days+1; + + return tm; +} + +/* get a positive number between n_min and n_max, for a maximum length + of len_max. Return -1 if error. */ +static int date_get_num(const char **pp, + int n_min, int n_max, int len_max) +{ + int i, val, c; + const char *p; + + p = *pp; + val = 0; + for(i = 0; i < len_max; i++) { + c = *p; + if (!isdigit(c)) + break; + val = (val * 10) + c - '0'; + p++; + } + /* no number read ? */ + if (p == *pp) + return -1; + if (val < n_min || val > n_max) + return -1; + *pp = p; + return val; +} + +/* small strptime for ffmpeg */ +const char *small_strptime(const char *p, const char *fmt, + struct tm *dt) +{ + int c, val; + + for(;;) { + c = *fmt++; + if (c == '\0') { + return p; + } else if (c == '%') { + c = *fmt++; + switch(c) { + case 'H': + val = date_get_num(&p, 0, 23, 2); + if (val == -1) + return NULL; + dt->tm_hour = val; + break; + case 'M': + val = date_get_num(&p, 0, 59, 2); + if (val == -1) + return NULL; + dt->tm_min = val; + break; + case 'S': + val = date_get_num(&p, 0, 59, 2); + if (val == -1) + return NULL; + dt->tm_sec = val; + break; + case 'Y': + val = date_get_num(&p, 0, 9999, 4); + if (val == -1) + return NULL; + dt->tm_year = val - 1900; + break; + case 'm': + val = date_get_num(&p, 1, 12, 2); + if (val == -1) + return NULL; + dt->tm_mon = val - 1; + break; + case 'd': + val = date_get_num(&p, 1, 31, 2); + if (val == -1) + return NULL; + dt->tm_mday = val; + break; + case '%': + goto match; + default: + return NULL; + } + } else { + match: + if (c != *p) + return NULL; + p++; + } + } + return p; +} + |