From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- .../src/third_party/libevent/event_tagging.c | 609 +++++++++++++++++++++ 1 file changed, 609 insertions(+) create mode 100644 ipc/chromium/src/third_party/libevent/event_tagging.c (limited to 'ipc/chromium/src/third_party/libevent/event_tagging.c') diff --git a/ipc/chromium/src/third_party/libevent/event_tagging.c b/ipc/chromium/src/third_party/libevent/event_tagging.c new file mode 100644 index 0000000000..b021e8c8de --- /dev/null +++ b/ipc/chromium/src/third_party/libevent/event_tagging.c @@ -0,0 +1,609 @@ +/* + * Copyright (c) 2003-2009 Niels Provos + * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson + * + * 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, this list of conditions and the following disclaimer. + * 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 BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 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 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "event2/event-config.h" +#include "evconfig-private.h" + +#ifdef EVENT__HAVE_SYS_TYPES_H +#include +#endif +#ifdef EVENT__HAVE_SYS_PARAM_H +#include +#endif + +#ifdef _WIN32 +#define WIN32_LEAN_AND_MEAN +#include +#include +#undef WIN32_LEAN_AND_MEAN +#endif + +#ifdef EVENT__HAVE_SYS_IOCTL_H +#include +#endif +#include +#ifdef EVENT__HAVE_SYS_TIME_H +#include +#endif + +#include +#include +#include +#include +#ifndef _WIN32 +#include +#endif +#ifdef EVENT__HAVE_UNISTD_H +#include +#endif +#include + +#include "event2/event.h" +#include "event2/tag.h" +#include "event2/buffer.h" +#include "log-internal.h" +#include "mm-internal.h" +#include "util-internal.h" + +/* + Here's our wire format: + + Stream = TaggedData* + + TaggedData = Tag Length Data + where the integer value of 'Length' is the length of 'data'. + + Tag = HByte* LByte + where HByte is a byte with the high bit set, and LByte is a byte + with the high bit clear. The integer value of the tag is taken + by concatenating the lower 7 bits from all the tags. So for example, + the tag 0x66 is encoded as [66], whereas the tag 0x166 is encoded as + [82 66] + + Length = Integer + + Integer = NNibbles Nibble* Padding? + where NNibbles is a 4-bit value encoding the number of nibbles-1, + and each Nibble is 4 bits worth of encoded integer, in big-endian + order. If the total encoded integer size is an odd number of nibbles, + a final padding nibble with value 0 is appended. +*/ + +EVENT2_EXPORT_SYMBOL +int evtag_decode_int(ev_uint32_t *pnumber, struct evbuffer *evbuf); +EVENT2_EXPORT_SYMBOL +int evtag_decode_int64(ev_uint64_t *pnumber, struct evbuffer *evbuf); +EVENT2_EXPORT_SYMBOL +int evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag); +EVENT2_EXPORT_SYMBOL +int evtag_decode_tag(ev_uint32_t *ptag, struct evbuffer *evbuf); + +void +evtag_init(void) +{ +} + +/* + * We encode integers by nibbles; the first nibble contains the number + * of significant nibbles - 1; this allows us to encode up to 64-bit + * integers. This function is byte-order independent. + * + * @param number a 32-bit unsigned integer to encode + * @param data a pointer to where the data should be written. Must + * have at least 5 bytes free. + * @return the number of bytes written into data. + */ + +#define ENCODE_INT_INTERNAL(data, number) do { \ + int off = 1, nibbles = 0; \ + \ + memset(data, 0, sizeof(number)+1); \ + while (number) { \ + if (off & 0x1) \ + data[off/2] = (data[off/2] & 0xf0) | (number & 0x0f); \ + else \ + data[off/2] = (data[off/2] & 0x0f) | \ + ((number & 0x0f) << 4); \ + number >>= 4; \ + off++; \ + } \ + \ + if (off > 2) \ + nibbles = off - 2; \ + \ + /* Off - 1 is the number of encoded nibbles */ \ + data[0] = (data[0] & 0x0f) | ((nibbles & 0x0f) << 4); \ + \ + return ((off + 1) / 2); \ +} while (0) + +static inline int +encode_int_internal(ev_uint8_t *data, ev_uint32_t number) +{ + ENCODE_INT_INTERNAL(data, number); +} + +static inline int +encode_int64_internal(ev_uint8_t *data, ev_uint64_t number) +{ + ENCODE_INT_INTERNAL(data, number); +} + +void +evtag_encode_int(struct evbuffer *evbuf, ev_uint32_t number) +{ + ev_uint8_t data[5]; + int len = encode_int_internal(data, number); + evbuffer_add(evbuf, data, len); +} + +void +evtag_encode_int64(struct evbuffer *evbuf, ev_uint64_t number) +{ + ev_uint8_t data[9]; + int len = encode_int64_internal(data, number); + evbuffer_add(evbuf, data, len); +} + +/* + * Support variable length encoding of tags; we use the high bit in each + * octet as a continuation signal. + */ + +int +evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag) +{ + int bytes = 0; + ev_uint8_t data[5]; + + memset(data, 0, sizeof(data)); + do { + ev_uint8_t lower = tag & 0x7f; + tag >>= 7; + + if (tag) + lower |= 0x80; + + data[bytes++] = lower; + } while (tag); + + if (evbuf != NULL) + evbuffer_add(evbuf, data, bytes); + + return (bytes); +} + +static int +decode_tag_internal(ev_uint32_t *ptag, struct evbuffer *evbuf, int dodrain) +{ + ev_uint32_t number = 0; + size_t len = evbuffer_get_length(evbuf); + ev_uint8_t *data; + size_t count = 0; + int shift = 0, done = 0; + + /* + * the encoding of a number is at most one byte more than its + * storage size. however, it may also be much smaller. + */ + data = evbuffer_pullup( + evbuf, len < sizeof(number) + 1 ? len : sizeof(number) + 1); + if (!data) + return (-1); + + while (count++ < len) { + ev_uint8_t lower = *data++; + if (shift >= 28) { + /* Make sure it fits into 32 bits */ + if (shift > 28) + return (-1); + if ((lower & 0x7f) > 15) + return (-1); + } + number |= (lower & (unsigned)0x7f) << shift; + shift += 7; + + if (!(lower & 0x80)) { + done = 1; + break; + } + } + + if (!done) + return (-1); + + if (dodrain) + evbuffer_drain(evbuf, count); + + if (ptag != NULL) + *ptag = number; + + return count > INT_MAX ? INT_MAX : (int)(count); +} + +int +evtag_decode_tag(ev_uint32_t *ptag, struct evbuffer *evbuf) +{ + return (decode_tag_internal(ptag, evbuf, 1 /* dodrain */)); +} + +/* + * Marshal a data type, the general format is as follows: + * + * tag number: one byte; length: var bytes; payload: var bytes + */ + +void +evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag, + const void *data, ev_uint32_t len) +{ + evtag_encode_tag(evbuf, tag); + evtag_encode_int(evbuf, len); + evbuffer_add(evbuf, (void *)data, len); +} + +void +evtag_marshal_buffer(struct evbuffer *evbuf, ev_uint32_t tag, + struct evbuffer *data) +{ + evtag_encode_tag(evbuf, tag); + /* XXX support more than UINT32_MAX data */ + evtag_encode_int(evbuf, (ev_uint32_t)evbuffer_get_length(data)); + evbuffer_add_buffer(evbuf, data); +} + +/* Marshaling for integers */ +void +evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag, ev_uint32_t integer) +{ + ev_uint8_t data[5]; + int len = encode_int_internal(data, integer); + + evtag_encode_tag(evbuf, tag); + evtag_encode_int(evbuf, len); + evbuffer_add(evbuf, data, len); +} + +void +evtag_marshal_int64(struct evbuffer *evbuf, ev_uint32_t tag, + ev_uint64_t integer) +{ + ev_uint8_t data[9]; + int len = encode_int64_internal(data, integer); + + evtag_encode_tag(evbuf, tag); + evtag_encode_int(evbuf, len); + evbuffer_add(evbuf, data, len); +} + +void +evtag_marshal_string(struct evbuffer *buf, ev_uint32_t tag, const char *string) +{ + /* TODO support strings longer than UINT32_MAX ? */ + evtag_marshal(buf, tag, string, (ev_uint32_t)strlen(string)); +} + +void +evtag_marshal_timeval(struct evbuffer *evbuf, ev_uint32_t tag, struct timeval *tv) +{ + ev_uint8_t data[10]; + int len = encode_int_internal(data, tv->tv_sec); + len += encode_int_internal(data + len, tv->tv_usec); + evtag_marshal(evbuf, tag, data, len); +} + +#define DECODE_INT_INTERNAL(number, maxnibbles, pnumber, evbuf, offset) \ +do { \ + ev_uint8_t *data; \ + ev_ssize_t len = evbuffer_get_length(evbuf) - offset; \ + int nibbles = 0; \ + \ + if (len <= 0) \ + return (-1); \ + \ + /* XXX(niels): faster? */ \ + data = evbuffer_pullup(evbuf, offset + 1) + offset; \ + if (!data) \ + return (-1); \ + \ + nibbles = ((data[0] & 0xf0) >> 4) + 1; \ + if (nibbles > maxnibbles || (nibbles >> 1) + 1 > len) \ + return (-1); \ + len = (nibbles >> 1) + 1; \ + \ + data = evbuffer_pullup(evbuf, offset + len) + offset; \ + if (!data) \ + return (-1); \ + \ + while (nibbles > 0) { \ + number <<= 4; \ + if (nibbles & 0x1) \ + number |= data[nibbles >> 1] & 0x0f; \ + else \ + number |= (data[nibbles >> 1] & 0xf0) >> 4; \ + nibbles--; \ + } \ + \ + *pnumber = number; \ + \ + return (int)(len); \ +} while (0) + +/* Internal: decode an integer from an evbuffer, without draining it. + * Only integers up to 32-bits are supported. + * + * @param evbuf the buffer to read from + * @param offset an index into the buffer at which we should start reading. + * @param pnumber a pointer to receive the integer. + * @return The length of the number as encoded, or -1 on error. + */ + +static int +decode_int_internal(ev_uint32_t *pnumber, struct evbuffer *evbuf, int offset) +{ + ev_uint32_t number = 0; + DECODE_INT_INTERNAL(number, 8, pnumber, evbuf, offset); +} + +static int +decode_int64_internal(ev_uint64_t *pnumber, struct evbuffer *evbuf, int offset) +{ + ev_uint64_t number = 0; + DECODE_INT_INTERNAL(number, 16, pnumber, evbuf, offset); +} + +int +evtag_decode_int(ev_uint32_t *pnumber, struct evbuffer *evbuf) +{ + int res = decode_int_internal(pnumber, evbuf, 0); + if (res != -1) + evbuffer_drain(evbuf, res); + + return (res == -1 ? -1 : 0); +} + +int +evtag_decode_int64(ev_uint64_t *pnumber, struct evbuffer *evbuf) +{ + int res = decode_int64_internal(pnumber, evbuf, 0); + if (res != -1) + evbuffer_drain(evbuf, res); + + return (res == -1 ? -1 : 0); +} + +int +evtag_peek(struct evbuffer *evbuf, ev_uint32_t *ptag) +{ + return (decode_tag_internal(ptag, evbuf, 0 /* dodrain */)); +} + +int +evtag_peek_length(struct evbuffer *evbuf, ev_uint32_t *plength) +{ + int res, len; + + len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */); + if (len == -1) + return (-1); + + res = decode_int_internal(plength, evbuf, len); + if (res == -1) + return (-1); + + *plength += res + len; + + return (0); +} + +int +evtag_payload_length(struct evbuffer *evbuf, ev_uint32_t *plength) +{ + int res, len; + + len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */); + if (len == -1) + return (-1); + + res = decode_int_internal(plength, evbuf, len); + if (res == -1) + return (-1); + + return (0); +} + +/* just unmarshals the header and returns the length of the remaining data */ + +int +evtag_unmarshal_header(struct evbuffer *evbuf, ev_uint32_t *ptag) +{ + ev_uint32_t len; + + if (decode_tag_internal(ptag, evbuf, 1 /* dodrain */) == -1) + return (-1); + if (evtag_decode_int(&len, evbuf) == -1) + return (-1); + + if (evbuffer_get_length(evbuf) < len) + return (-1); + + return (len); +} + +int +evtag_consume(struct evbuffer *evbuf) +{ + int len; + if ((len = evtag_unmarshal_header(evbuf, NULL)) == -1) + return (-1); + evbuffer_drain(evbuf, len); + + return (0); +} + +/* Reads the data type from an event buffer */ + +int +evtag_unmarshal(struct evbuffer *src, ev_uint32_t *ptag, struct evbuffer *dst) +{ + int len; + + if ((len = evtag_unmarshal_header(src, ptag)) == -1) + return (-1); + + if (evbuffer_add(dst, evbuffer_pullup(src, len), len) == -1) + return (-1); + + evbuffer_drain(src, len); + + return (len); +} + +/* Marshaling for integers */ + +int +evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag, + ev_uint32_t *pinteger) +{ + ev_uint32_t tag; + ev_uint32_t len; + int result; + + if (decode_tag_internal(&tag, evbuf, 1 /* dodrain */) == -1) + return (-1); + if (need_tag != tag) + return (-1); + if (evtag_decode_int(&len, evbuf) == -1) + return (-1); + + if (evbuffer_get_length(evbuf) < len) + return (-1); + + result = decode_int_internal(pinteger, evbuf, 0); + evbuffer_drain(evbuf, len); + if (result < 0 || (size_t)result > len) /* XXX Should this be != rather than > ?*/ + return (-1); + else + return result; +} + +int +evtag_unmarshal_int64(struct evbuffer *evbuf, ev_uint32_t need_tag, + ev_uint64_t *pinteger) +{ + ev_uint32_t tag; + ev_uint32_t len; + int result; + + if (decode_tag_internal(&tag, evbuf, 1 /* dodrain */) == -1) + return (-1); + if (need_tag != tag) + return (-1); + if (evtag_decode_int(&len, evbuf) == -1) + return (-1); + + if (evbuffer_get_length(evbuf) < len) + return (-1); + + result = decode_int64_internal(pinteger, evbuf, 0); + evbuffer_drain(evbuf, len); + if (result < 0 || (size_t)result > len) /* XXX Should this be != rather than > ?*/ + return (-1); + else + return result; +} + +/* Unmarshal a fixed length tag */ + +int +evtag_unmarshal_fixed(struct evbuffer *src, ev_uint32_t need_tag, void *data, + size_t len) +{ + ev_uint32_t tag; + int tag_len; + + /* Now unmarshal a tag and check that it matches the tag we want */ + if ((tag_len = evtag_unmarshal_header(src, &tag)) < 0 || + tag != need_tag) + return (-1); + + if ((size_t)tag_len != len) + return (-1); + + evbuffer_remove(src, data, len); + return (0); +} + +int +evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag, + char **pstring) +{ + ev_uint32_t tag; + int tag_len; + + if ((tag_len = evtag_unmarshal_header(evbuf, &tag)) == -1 || + tag != need_tag) + return (-1); + + *pstring = mm_malloc(tag_len + 1); + if (*pstring == NULL) { + event_warn("%s: malloc", __func__); + return -1; + } + evbuffer_remove(evbuf, *pstring, tag_len); + (*pstring)[tag_len] = '\0'; + + return (0); +} + +int +evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag, + struct timeval *ptv) +{ + ev_uint32_t tag; + ev_uint32_t integer; + int len, offset, offset2; + int result = -1; + + if ((len = evtag_unmarshal_header(evbuf, &tag)) == -1) + return (-1); + if (tag != need_tag) + goto done; + if ((offset = decode_int_internal(&integer, evbuf, 0)) == -1) + goto done; + ptv->tv_sec = integer; + if ((offset2 = decode_int_internal(&integer, evbuf, offset)) == -1) + goto done; + ptv->tv_usec = integer; + if (offset + offset2 > len) /* XXX Should this be != instead of > ? */ + goto done; + + result = 0; + done: + evbuffer_drain(evbuf, len); + return result; +} -- cgit v1.2.3