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From: Zane van Iperen To: ffmpeg-devel@ffmpeg.org Date: Sun, 24 Apr 2022 20:14:03 +1000 Message-Id: <20220424101409.95486-2-zane@zanevaniperen.com> In-Reply-To: <20220424101409.95486-1-zane@zanevaniperen.com> References: <20220424101409.95486-1-zane@zanevaniperen.com> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: cadance.vs49688.net Subject: [FFmpeg-devel] [PATCH v2 1/7] avutil/uuid: add utility library for manipulating UUIDs as specified in RFC 4122 X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Pierre-Anthony Lemieux Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: 5reFGFITOuD8 Co-authored-by: Pierre-Anthony Lemieux Signed-off-by: Zane van Iperen --- libavutil/Makefile | 2 + libavutil/uuid.c | 155 +++++++++++++++++++++++++++++++++++++++++++++ libavutil/uuid.h | 137 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 294 insertions(+) create mode 100644 libavutil/uuid.c create mode 100644 libavutil/uuid.h diff --git a/libavutil/Makefile b/libavutil/Makefile index 81df3b0640..29742668b8 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 \ video_enc_params.o \ film_grain_params.o \ diff --git a/libavutil/uuid.c b/libavutil/uuid.c new file mode 100644 index 0000000000..6cf7a20c23 --- /dev/null +++ b/libavutil/uuid.c @@ -0,0 +1,155 @@ +/* + * Copyright (c) 2022 Pierre-Anthony Lemieux + * Zane van Iperen + * + * 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 + * @author Zane van Iperen + */ + +#include "uuid.h" +#include "error.h" +#include "avstring.h" +#include +#include + +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); +} + +int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu) +{ + int i; + const char *cp; + char buf[3]; + + if ((in_end - in_start) != 36) + return -1; + + for (i = 0, cp = in_start; i < 36; i++, cp++) { + if (i == 8 || i == 13 || i == 18 || i == 23) { + if (*cp == '-') + continue; + return AVERROR(EINVAL); + } + + if (!av_isxdigit(*cp)) + return AVERROR(EINVAL); + } + + buf[2] = '\0'; + for (i = 0, cp = in_start; i < 16; i++) { + if (i == 4 || i == 6 || i == 8 || i == 10) + cp++; + + buf[0] = *cp++; + buf[1] = *cp++; + + errno = 0; + uu[i] = strtoul(buf, NULL, 16); + if (errno) + return AVERROR(errno); + } + + 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); +} + +int av_uuid_equal(const AVUUID uu1, const AVUUID uu2) +{ + return memcmp(uu1, uu2, AV_UUID_LEN) == 0; +} + +void av_uuid_copy(AVUUID dest, const AVUUID src) +{ + memcpy(dest, src, AV_UUID_LEN); +} + +void av_uuid_nil_set(AVUUID uu) +{ + memset(uu, 0, AV_UUID_LEN); +} diff --git a/libavutil/uuid.h b/libavutil/uuid.h new file mode 100644 index 0000000000..d7cd382ec2 --- /dev/null +++ b/libavutil/uuid.h @@ -0,0 +1,137 @@ +/* + * Copyright (c) 2022 Pierre-Anthony Lemieux + * Zane van Iperen + * + * 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 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 + * @author Zane van Iperen + */ + +#ifndef AVUTIL_UUID_H +#define AVUTIL_UUID_H + +#include + +#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 NULL 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 NULL 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. The string must consist of + * 36 characters, i.e. `in_end - in_start == 36` + * + * @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 + * @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 NULL character. + * + * @param[in] uu AVUUID + * @param[out] out Pointer to a 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 + */ +int av_uuid_equal(const AVUUID uu1, const AVUUID uu2); + +/** + * Copies the bytes of src into dest. + * + * @param[out] dest AVUUID + * @param[in] src AVUUID + */ +void av_uuid_copy(AVUUID dest, const AVUUID src); + +/** + * Sets a UUID to nil + * + * @param[in,out] uu UUID to be set to nil + */ +void av_uuid_nil_set(AVUUID uu); + +#endif /* AVUTIL_UUID_H */