Message ID | 20220531031334.19488-1-pal@sandflow.com |
---|---|
State | New |
Headers | show |
Series | [FFmpeg-devel,v3,1/6] avutil/uuid: add utility library for manipulating UUIDs as specified in RFC 4122 | expand |
pal@sandflow.com: > From: Zane van Iperen <zane@zanevaniperen.com> > > Addresses review comments including: > > * simplifying av_uuid_parse_range() > * removing avcodec/cbs_sei from this refactoring exercise > > Co-authored-by: Pierre-Anthony Lemieux <pal@palemieux.com> > Signed-off-by: Zane van Iperen <zane@zanevaniperen.com> > --- > libavutil/Makefile | 2 + > libavutil/uuid.c | 142 +++++++++++++++++++++++++++++++++++++++++++ > libavutil/uuid.h | 147 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 291 insertions(+) > create mode 100644 libavutil/uuid.c > create mode 100644 libavutil/uuid.h > > diff --git a/libavutil/uuid.c b/libavutil/uuid.c > new file mode 100644 > index 0000000000..8943212f30 > --- /dev/null > +++ b/libavutil/uuid.c > @@ -0,0 +1,142 @@ > +/* > + * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com> > + * Zane van Iperen <zane@zanevaniperen.com> > + * > + * 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 > + */ > + > +/* > + * Copyright (C) 1996, 1997 Theodore Ts'o. > + * > + * Redistribution and use in source and binary forms, with or without > + * modification, are permitted provided that the following conditions > + * are met: > + * 1. Redistributions of source code must retain the above copyright > + * notice, and the entire permission notice in its entirety, > + * including the disclaimer of warranties. > + * 2. Redistributions in binary form must reproduce the above copyright > + * notice, this list of conditions and the following disclaimer in the > + * documentation and/or other materials provided with the distribution. > + * 3. The name of the author may not be used to endorse or promote > + * products derived from this software without specific prior > + * written permission. > + * > + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED > + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES > + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF > + * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT > + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR > + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF > + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE > + * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH > + * DAMAGE. > + */ > + > +/** > + * @file > + * UUID parsing and serialization utilities. > + * The library treat the UUID as an opaque sequence of 16 unsigned bytes, > + * i.e. ignoring the internal layout of the UUID, which depends on the type > + * of the UUID. > + * > + * @author Pierre-Anthony Lemieux <pal@palemieux.com> > + * @author Zane van Iperen <zane@zanevaniperen.com> > + */ > + > +#include "uuid.h" > +#include "error.h" > +#include "avstring.h" > +#include <stdlib.h> What is this used for? > + > +int av_uuid_parse(const char *in, AVUUID uu) > +{ > + if (strlen(in) != 36) > + return AVERROR(EINVAL); > + > + return av_uuid_parse_range(in, in + 36, uu); > +} > + > +static int xdigit_to_int(char c) > +{ > + c = av_tolower(c); > + > + if (c >= 'a' && c <= 'f') > + return c - 'a' + 10; > + > + if (c >= '0' && c <= '9') > + return c - '0'; > + > + return -1; > +} > + > +int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu) > +{ > + int i; > + const char *cp; > + > + if ((in_end - in_start) != 36) > + return AVERROR(EINVAL); > + > + for (i = 0, cp = in_start; i < 16; i++) { > + int hi; > + int lo; > + > + if (i == 4 || i == 6 || i == 8 || i == 10) > + cp++; > + > + hi = xdigit_to_int(*cp++); > + lo = xdigit_to_int(*cp++); > + > + if (hi == -1 || lo == -1) > + return AVERROR(EINVAL); > + > + uu[i] = (hi << 4) + lo; > + } > + > + return 0; > +} > + > +static char const hexdigits_lower[16] = "0123456789abcdef"; Our typical order is "static const char" > + > +void av_uuid_unparse(const AVUUID uuid, char *out) > +{ > + char *p = out; > + > + for (int i = 0; i < 16; i++) { > + uint8_t tmp; > + > + if (i == 4 || i == 6 || i == 8 || i == 10) > + *p++ = '-'; > + > + tmp = uuid[i]; > + *p++ = hexdigits_lower[tmp >> 4]; > + *p++ = hexdigits_lower[tmp & 15]; > + } > + > + *p = '\0'; > +} > + > +int av_uuid_urn_parse(const char *in, AVUUID uu) > +{ > + if (av_stristr(in, "urn:uuid:") != in) > + return AVERROR(EINVAL); > + > + return av_uuid_parse(in + 9, uu); > +}
On Tue, May 31, 2022 at 3:40 AM Andreas Rheinhardt <andreas.rheinhardt@outlook.com> wrote: > > pal@sandflow.com: > > From: Zane van Iperen <zane@zanevaniperen.com> > > > > Addresses review comments including: > > > > * simplifying av_uuid_parse_range() > > * removing avcodec/cbs_sei from this refactoring exercise > > > > Co-authored-by: Pierre-Anthony Lemieux <pal@palemieux.com> > > Signed-off-by: Zane van Iperen <zane@zanevaniperen.com> > > --- > > libavutil/Makefile | 2 + > > libavutil/uuid.c | 142 +++++++++++++++++++++++++++++++++++++++++++ > > libavutil/uuid.h | 147 +++++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 291 insertions(+) > > create mode 100644 libavutil/uuid.c > > create mode 100644 libavutil/uuid.h > > > > diff --git a/libavutil/uuid.c b/libavutil/uuid.c > > new file mode 100644 > > index 0000000000..8943212f30 > > --- /dev/null > > +++ b/libavutil/uuid.c > > @@ -0,0 +1,142 @@ > > +/* > > + * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com> > > + * Zane van Iperen <zane@zanevaniperen.com> > > + * > > + * 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 > > + */ > > + > > +/* > > + * Copyright (C) 1996, 1997 Theodore Ts'o. > > + * > > + * Redistribution and use in source and binary forms, with or without > > + * modification, are permitted provided that the following conditions > > + * are met: > > + * 1. Redistributions of source code must retain the above copyright > > + * notice, and the entire permission notice in its entirety, > > + * including the disclaimer of warranties. > > + * 2. Redistributions in binary form must reproduce the above copyright > > + * notice, this list of conditions and the following disclaimer in the > > + * documentation and/or other materials provided with the distribution. > > + * 3. The name of the author may not be used to endorse or promote > > + * products derived from this software without specific prior > > + * written permission. > > + * > > + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED > > + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES > > + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF > > + * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE > > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR > > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT > > + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR > > + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF > > + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT > > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE > > + * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH > > + * DAMAGE. > > + */ > > + > > +/** > > + * @file > > + * UUID parsing and serialization utilities. > > + * The library treat the UUID as an opaque sequence of 16 unsigned bytes, > > + * i.e. ignoring the internal layout of the UUID, which depends on the type > > + * of the UUID. > > + * > > + * @author Pierre-Anthony Lemieux <pal@palemieux.com> > > + * @author Zane van Iperen <zane@zanevaniperen.com> > > + */ > > + > > +#include "uuid.h" > > +#include "error.h" > > +#include "avstring.h" > > +#include <stdlib.h> > > What is this used for? Nothing as far as I can tell. Left over from now-removed libuuid code. Will remove. > > > + > > +int av_uuid_parse(const char *in, AVUUID uu) > > +{ > > + if (strlen(in) != 36) > > + return AVERROR(EINVAL); > > + > > + return av_uuid_parse_range(in, in + 36, uu); > > +} > > + > > +static int xdigit_to_int(char c) > > +{ > > + c = av_tolower(c); > > + > > + if (c >= 'a' && c <= 'f') > > + return c - 'a' + 10; > > + > > + if (c >= '0' && c <= '9') > > + return c - '0'; > > + > > + return -1; > > +} > > + > > +int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu) > > +{ > > + int i; > > + const char *cp; > > + > > + if ((in_end - in_start) != 36) > > + return AVERROR(EINVAL); > > + > > + for (i = 0, cp = in_start; i < 16; i++) { > > + int hi; > > + int lo; > > + > > + if (i == 4 || i == 6 || i == 8 || i == 10) > > + cp++; > > + > > + hi = xdigit_to_int(*cp++); > > + lo = xdigit_to_int(*cp++); > > + > > + if (hi == -1 || lo == -1) > > + return AVERROR(EINVAL); > > + > > + uu[i] = (hi << 4) + lo; > > + } > > + > > + return 0; > > +} > > + > > +static char const hexdigits_lower[16] = "0123456789abcdef"; > > Our typical order is "static const char" Ok. Will fix. > > > + > > +void av_uuid_unparse(const AVUUID uuid, char *out) > > +{ > > + char *p = out; > > + > > + for (int i = 0; i < 16; i++) { > > + uint8_t tmp; > > + > > + if (i == 4 || i == 6 || i == 8 || i == 10) > > + *p++ = '-'; > > + > > + tmp = uuid[i]; > > + *p++ = hexdigits_lower[tmp >> 4]; > > + *p++ = hexdigits_lower[tmp & 15]; > > + } > > + > > + *p = '\0'; > > +} > > + > > +int av_uuid_urn_parse(const char *in, AVUUID uu) > > +{ > > + if (av_stristr(in, "urn:uuid:") != in) > > + return AVERROR(EINVAL); > > + > > + return av_uuid_parse(in + 9, uu); > > +} > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
diff --git a/libavutil/Makefile b/libavutil/Makefile index 234de62a4b..a0c5cacef4 100644 --- a/libavutil/Makefile +++ b/libavutil/Makefile @@ -82,6 +82,7 @@ HEADERS = adler32.h \ timestamp.h \ tree.h \ twofish.h \ + uuid.h \ version.h \ video_enc_params.h \ xtea.h \ @@ -174,6 +175,7 @@ OBJS = adler32.o \ tx_float.o \ tx_double.o \ tx_int32.o \ + uuid.o \ version.o \ video_enc_params.o \ film_grain_params.o \ diff --git a/libavutil/uuid.c b/libavutil/uuid.c new file mode 100644 index 0000000000..8943212f30 --- /dev/null +++ b/libavutil/uuid.c @@ -0,0 +1,142 @@ +/* + * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com> + * Zane van Iperen <zane@zanevaniperen.com> + * + * 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 + */ + +/* + * Copyright (C) 1996, 1997 Theodore Ts'o. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF + * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + */ + +/** + * @file + * UUID parsing and serialization utilities. + * The library treat the UUID as an opaque sequence of 16 unsigned bytes, + * i.e. ignoring the internal layout of the UUID, which depends on the type + * of the UUID. + * + * @author Pierre-Anthony Lemieux <pal@palemieux.com> + * @author Zane van Iperen <zane@zanevaniperen.com> + */ + +#include "uuid.h" +#include "error.h" +#include "avstring.h" +#include <stdlib.h> + +int av_uuid_parse(const char *in, AVUUID uu) +{ + if (strlen(in) != 36) + return AVERROR(EINVAL); + + return av_uuid_parse_range(in, in + 36, uu); +} + +static int xdigit_to_int(char c) +{ + c = av_tolower(c); + + if (c >= 'a' && c <= 'f') + return c - 'a' + 10; + + if (c >= '0' && c <= '9') + return c - '0'; + + return -1; +} + +int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu) +{ + int i; + const char *cp; + + if ((in_end - in_start) != 36) + return AVERROR(EINVAL); + + for (i = 0, cp = in_start; i < 16; i++) { + int hi; + int lo; + + if (i == 4 || i == 6 || i == 8 || i == 10) + cp++; + + hi = xdigit_to_int(*cp++); + lo = xdigit_to_int(*cp++); + + if (hi == -1 || lo == -1) + return AVERROR(EINVAL); + + uu[i] = (hi << 4) + lo; + } + + return 0; +} + +static char const hexdigits_lower[16] = "0123456789abcdef"; + +void av_uuid_unparse(const AVUUID uuid, char *out) +{ + char *p = out; + + for (int i = 0; i < 16; i++) { + uint8_t tmp; + + if (i == 4 || i == 6 || i == 8 || i == 10) + *p++ = '-'; + + tmp = uuid[i]; + *p++ = hexdigits_lower[tmp >> 4]; + *p++ = hexdigits_lower[tmp & 15]; + } + + *p = '\0'; +} + +int av_uuid_urn_parse(const char *in, AVUUID uu) +{ + if (av_stristr(in, "urn:uuid:") != in) + return AVERROR(EINVAL); + + return av_uuid_parse(in + 9, uu); +} diff --git a/libavutil/uuid.h b/libavutil/uuid.h new file mode 100644 index 0000000000..4b5088911c --- /dev/null +++ b/libavutil/uuid.h @@ -0,0 +1,147 @@ +/* + * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com> + * Zane van Iperen <zane@zanevaniperen.com> + * + * 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 + */ + +/** + * @file + * UUID parsing and serialization utilities. + * The library treats the UUID as an opaque sequence of 16 unsigned bytes, + * i.e. ignoring the internal layout of the UUID, which depends on the type + * of the UUID. + * + * @author Pierre-Anthony Lemieux <pal@palemieux.com> + * @author Zane van Iperen <zane@zanevaniperen.com> + */ + +#ifndef AVUTIL_UUID_H +#define AVUTIL_UUID_H + +#include <stdint.h> +#include <string.h> + +#define AV_PRI_UUID \ + "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-" \ + "%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx" + +#define AV_PRI_URN_UUID \ + "urn:uuid:%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-" \ + "%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx" + +/* AV_UUID_ARG() is used together with AV_PRI_UUID() or AV_PRI_URN_UUID + * to print UUIDs, e.g. + * av_log(NULL, AV_LOG_DEBUG, "UUID: " AV_PRI_UUID, AV_UUID_ARG(uuid)); + */ +#define AV_UUID_ARG(x) \ + (x)[ 0], (x)[ 1], (x)[ 2], (x)[ 3], \ + (x)[ 4], (x)[ 5], (x)[ 6], (x)[ 7], \ + (x)[ 8], (x)[ 9], (x)[10], (x)[11], \ + (x)[12], (x)[13], (x)[14], (x)[15] + +#define AV_UUID_LEN 16 + +/* Binary representation of a UUID */ +typedef uint8_t AVUUID[AV_UUID_LEN]; + +/** + * Parses a string representation of a UUID formatted according to IETF RFC 4122 + * into an AVUUID. The parsing is case-insensitive. The string must be 37 + * characters long, including the terminating NUL character. + * + * Example string representation: "2fceebd0-7017-433d-bafb-d073a7116696" + * + * @param[in] in String representation of a UUID, + * e.g. 2fceebd0-7017-433d-bafb-d073a7116696 + * @param[out] uu AVUUID + * @return A non-zero value in case of an error. + */ +int av_uuid_parse(const char *in, AVUUID uu); + +/** + * Parses a URN representation of a UUID, as specified at IETF RFC 4122, + * into an AVUUID. The parsing is case-insensitive. The string must be 46 + * characters long, including the terminating NUL character. + * + * Example string representation: "urn:uuid:2fceebd0-7017-433d-bafb-d073a7116696" + * + * @param[in] in URN UUID + * @param[out] uu AVUUID + * @return A non-zero value in case of an error. + */ +int av_uuid_urn_parse(const char *in, AVUUID uu); + +/** + * Parses a string representation of a UUID formatted according to IETF RFC 4122 + * into an AVUUID. The parsing is case-insensitive. + * + * @param[in] in_start Pointer to the first character of the string representation + * @param[in] in_end Pointer to the character after the last character of the + * string representation. That memory location is never + * accessed. It is an error if `in_end - in_start != 36`. + * @param[out] uu AVUUID + * @return A non-zero value in case of an error. + */ +int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu); + +/** + * Serializes a AVUUID into a string representation according to IETF RFC 4122. + * The string is lowercase and always 37 characters long, including the + * terminating NUL character. + * + * @param[in] uu AVUUID + * @param[out] out Pointer to an array of no less than 37 characters. + * @return A non-zero value in case of an error. + */ +void av_uuid_unparse(const AVUUID uu, char *out); + +/** + * Compares two UUIDs for equality. + * + * @param[in] uu1 AVUUID + * @param[in] uu2 AVUUID + * @return Nonzero if uu1 and uu2 are identical, 0 otherwise + */ +static inline int av_uuid_equal(const AVUUID uu1, const AVUUID uu2) +{ + return memcmp(uu1, uu2, AV_UUID_LEN) == 0; +} + +/** + * Copies the bytes of src into dest. + * + * @param[out] dest AVUUID + * @param[in] src AVUUID + */ +static inline void av_uuid_copy(AVUUID dest, const AVUUID src) +{ + memcpy(dest, src, AV_UUID_LEN); +} + +/** + * Sets a UUID to the nil UUID, i.e. a UUID with have all + * its 128 bits set to zero. + * + * @param[in,out] uu UUID to be set to the nil UUID + */ +static inline void av_uuid_nil(AVUUID uu) +{ + memset(uu, 0, AV_UUID_LEN); +} + +#endif /* AVUTIL_UUID_H */