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test mqtt length's encoding

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This commit is contained in:
zhengshuxin 2021-03-25 16:43:02 +08:00
parent 7270b2eb71
commit 9a9dae1ab8
4 changed files with 85 additions and 10 deletions
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4
lib_acl_cpp/samples/mqtt/mqtt_length/Makefile Normal file
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@ -0,0 +1,4 @@
all:
g++ -o test main.cpp
clean:
rm -f test

71
lib_acl_cpp/samples/mqtt/mqtt_length/main.cpp Normal file
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@ -0,0 +1,71 @@
/**
* Copyright (C) 2015-2018 IQIYI
* All rights reserved.
*
* AUTHOR(S)
* Zheng Shuxin
* E-mail: zhengshuxin@qiyi.com
*
* VERSION
* Wed 24 Mar 2021 06:49:23 PM CST
*/
#include <stdio.h>
#include <stdlib.h>
static unsigned decode(const unsigned char* buf, unsigned len) {
unsigned n = 0;
for (unsigned i = 0; i < len; i++) {
n |= (unsigned) ((buf[i] & 0x7f) << (7 * i));
}
return n;
}
static int encode(unsigned n, unsigned char *buf) {
int len = 0;
if (n < 128) {
buf[len++] = n & 0x7f;
} else if (n < 16384) {
buf[len++] = ((unsigned char) n & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 7) & 0x7f);
} else if (n < 2097152) {
buf[len++] = ((unsigned char) n & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 7 ) & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 14) & 0x7f);
} else if (n < 268435456) {
buf[len++] = ((unsigned char) n & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 7 ) & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 14) & 0x7f) | 0x80;
buf[len++] = ((unsigned char) (n >> 21) & 0x7f);
} else {
printf("invalid dlen_=%u\n", n);
return -1;
}
return len;
}
int main(void) {
unsigned char buf[4];
unsigned i, max= 268435455;
for (i = 0; i < max; i++) {
int len = encode(i, buf);
if (len == -1) {
printf("encode i=%u error\r\n", i);
break;
}
unsigned n = decode(buf, (unsigned) len);
if (n != i) {
printf("decode error, n=%u, i=%u\n", n, i);
break;
}
if (i < 10) {
printf("ok, i=%u, n=%u\n", i, n);
}
}
printf("i=%u, max=%u, status=%s\r\n", i, max, i == max ? "ok" : "error");
return 0;
}

2
lib_acl_cpp/samples/mqtt/mqtt_pub/main.cpp
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@ -24,7 +24,7 @@ static bool test_publish(acl::mqtt_client& conn, unsigned short id) {
publish.set_topic(topic);
acl::string payload;
payload.format("payload-%d", id);
payload.format("payload-%ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd", id);
publish.set_payload((unsigned) payload.size(), payload);
if (!conn.send(publish)) {

18
lib_acl_cpp/src/mqtt/mqtt_header.cpp
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@ -151,17 +151,17 @@ bool mqtt_header::build_header(string& out) {
if (dlen_ < 128) {
header[len++] = dlen_ & 0x7f;
} else if (dlen_ < 16384) {
header[len++] = (unsigned char) dlen_ & 0x7f;
header[len++] = ((unsigned char) (dlen_ >> 7) & 0x7f) | 0x80;
header[len++] = ((unsigned char) dlen_ & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 7) & 0x7f);
} else if (dlen_ < 2097152) {
header[len++] = (unsigned char) dlen_ & 0x7f;
header[len++] = ((unsigned char)(dlen_ >> 7 ) & 0x7f) | 0x80;
header[len++] = ((unsigned char)(dlen_ >> 14) & 0x7f) | 0x80;
header[len++] = ((unsigned char) dlen_ & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 7 ) & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 14) & 0x7f);
} else if (dlen_ < 268435456) {
header[len++] = (unsigned char) dlen_ & 0x7f;
header[len++] = ((unsigned char)(dlen_ >> 7 ) & 0x7f) | 0x80;
header[len++] = ((unsigned char)(dlen_ >> 14) & 0x7f) | 0x80;
header[len++] = ((unsigned char)(dlen_ >> 21) & 0x7f) | 0x80;
header[len++] = ((unsigned char) dlen_ & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 7 ) & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 14) & 0x7f) | 0x80;
header[len++] = ((unsigned char) (dlen_ >> 21) & 0x7f);
} else {
logger_error("invalid dlen_=%u", dlen_);
return false;