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SPANParser.cpp
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SPANParser.cpp
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#include "SPANParser.h"
#include <algorithm>
#include <cstring>
#include <iostream>
#include <sstream>
#include <vector>
#include "SPANHeader.h"
#include "SPANMessage.h"
namespace SPAN {
const ULong CRC32_POLYNOMIAL = 0xEDB88320;
/* --------------------------------------------------------------------------
Calculate a CRC value to be used by CRC calculation functions.
-------------------------------------------------------------------------- */
ULong CRC32Value(int i) {
int j;
ULong ulCRC;
ulCRC = i;
for (j = 8; j > 0; j--) {
if (ulCRC & 1)
ulCRC = (ulCRC >> 1) ^ CRC32_POLYNOMIAL;
else
ulCRC >>= 1;
}
return ulCRC;
}
/* --------------------------------------------------------------------------
Calculates the CRC-32 of a block of data all at once
-------------------------------------------------------------------------- */
ULong CalculateBlockCRC32(
unsigned long ulCount, /* Number of bytes in the data block */
unsigned char *ucBuffer) /* Data block */
{
ULong ulTemp1;
ULong ulTemp2;
ULong ulCRC = 0;
while (ulCount-- != 0) {
ulTemp1 = (ulCRC >> 8) & 0x00FFFFFF;
ulTemp2 = CRC32Value(((int)ulCRC ^ *ucBuffer++) & 0xff);
ulCRC = ulTemp1 ^ ulTemp2;
}
return (ulCRC);
}
Parser::Parser() { parseState = ParseState::IDLE; }
Parser::~Parser() {
for (auto iter = callbacksType.begin(); iter != callbacksType.end();
iter++) {
if (releaseCallbacks[iter->first] != nullptr) {
(*(std::function<void()> *)releaseCallbacks[iter->first])();
delete (std::function<void()> *)releaseCallbacks[iter->first];
releaseCallbacks[iter->first] = nullptr;
}
}
}
void Parser::push(std::string buf) {
if (buf.empty()) {
return;
}
bool loop = false;
msg.append(buf);
do {
loop = false;
switch (parseState) {
case ParseState::IDLE: {
dataType = DataType::Unknown;
size_t index = 0;
for (size_t i = 0; i < msg.size(); ++i) {
auto &&c = msg[i];
if (c == char(0xAA)) {
dataType = DataType::Binary;
index = i;
break;
} else if (c == '%') {
dataType = DataType::ShortASCII;
index = i;
break;
} else if (c == '#') {
dataType = DataType::ASCII;
index = i;
break;
} else if (c == '<') {
dataType = DataType::Abbreviated;
index = i;
break;
}
}
switch (dataType) {
case DataType::Binary: {
msg.erase(0, index);
if (msg.size() > 1) {
if (msg[1] == char(0x44)) {
if (msg.size() > 2) {
if (msg[2] == char(0x12)) {
parseState = ParseState::BinaryHeader;
loop = true;
} else if (msg[2] == char(0x13)) {
dataType = DataType::ShortBinary;
parseState =
ParseState::ShortBinaryHeader;
loop = true;
} else {
msg.erase(0, 2);
loop = true;
}
}
} else {
msg.erase(0, 1);
loop = true;
}
}
} break;
case DataType::ASCII: {
parseState = ParseState::ASCIIHeader;
msg.erase(0, index);
loop = true;
} break;
case DataType::ShortASCII: {
parseState = ParseState::ShortASCIIHeader;
msg.erase(0, index);
loop = true;
} break;
case DataType::Unknown:
default:
msg.clear();
break;
}
} break;
case ParseState::Abbreviated: {
auto index = msg.find_first_of('\n');
if (index != msg.npos) {
std::string abbr(msg.begin(), msg.begin() + index + 1);
if (abbr.end() ==
std::find_if(abbr.begin(), abbr.end(), [](int ch) {
return !(std::isprint(ch) || std::isspace(ch));
})) {
if (abbreviatedCallback) abbreviatedCallback(abbr);
msg.erase(0, index + 1);
} else {
msg.erase(0, 1);
}
parseState = ParseState::IDLE;
loop = true;
} else {
if (msg.end() !=
std::find_if(msg.begin(), msg.end(), [](int ch) {
return !(std::isprint(ch) || std::isspace(ch));
})) {
parseState = ParseState::IDLE;
msg.erase(0, 1);
loop = true;
}
}
} break;
case ParseState::ASCIIHeader:
case ParseState::ShortASCIIHeader: {
auto index = msg.find_first_of(';');
if (index != msg.npos) {
parseState = ParseState::ASCIIData;
if (msg.size() > index + 1) {
loop = true;
}
} else {
if (msg.end() !=
std::find_if(msg.begin(), msg.end(), [](int ch) {
return !(std::isprint(ch) || std::isspace(ch));
})) {
parseState = ParseState::IDLE;
msg.erase(0, 1);
loop = true;
}
}
} break;
case ParseState::ASCIIData: {
auto index = msg.find_first_of('*');
if (index != msg.npos) {
parseState = ParseState::ASCIICRC;
if (msg.size() > index + 1) {
loop = true;
}
} else {
if (msg.end() !=
std::find_if(msg.begin(), msg.end(), [](int ch) {
return !(std::isprint(ch) || std::isspace(ch));
})) {
parseState = ParseState::IDLE;
msg.erase(0, 1);
loop = true;
}
}
} break;
case ParseState::ASCIICRC: {
auto index = msg.find_first_of('*');
if (msg.size() >= index + 9) {
std::string crcStr(msg.begin() + index + 1,
msg.begin() + index + 9);
ULong crc = std::stoul(crcStr, 0, 16);
ULong calcrc = CalculateBlockCRC32(
index - 1, (unsigned char *)&msg[1]);
if (calcrc == crc) {
auto headerend = msg.find_first_of(';');
std::string headerstr(msg.begin() + 1,
msg.begin() + headerend);
headerstr.push_back(',');
std::istringstream headerstream(headerstr);
std::string s;
std::vector<std::string> strs;
while (getline(headerstream, s, ',')) {
strs.push_back(s);
}
if (strs[0].size() > 1) {
strs[0].erase(strs[0].end() - 1, strs[0].end());
}
Header header;
ShortHeader sheader;
bool isSucceed = true;
switch (dataType) {
case DataType::ASCII: {
if (!Header::fromAscii(strs, header)) {
isSucceed = false;
}
} break;
case DataType::ShortASCII: {
if (!ShortHeader::fromAscii(strs, sheader)) {
isSucceed = false;
}
} break;
default:
isSucceed = false;
break;
}
if (isSucceed) {
std::string datastr(msg.begin() + headerend + 1,
msg.begin() + index);
datastr.push_back(',');
std::istringstream datastream(datastr);
strs.clear();
while (getline(datastream, s, ',')) {
strs.push_back(s);
}
switch (dataType) {
case DataType::ASCII: {
auto *va = callbacksType[header.message_ID];
if (va != nullptr) {
memmove(va, &header, sizeof(header));
if (ConstructASCIIWithoutHeader(
header.message_ID, strs, va)) {
std::function<void(void *)> *func =
(std::function<void(void *)> *)
callbacks[header
.message_ID];
if (func != nullptr) {
(*func)(va);
}
}
}
break;
}
case DataType::ShortASCII: {
auto *va =
callbacksType[sheader.message_ID];
if (va != nullptr) {
memmove(va, &sheader, sizeof(sheader));
if (ConstructASCIIWithoutHeader(
sheader.message_ID, strs, va)) {
std::function<void(void *)> *func =
(std::function<void(void *)> *)
callbacks[sheader
.message_ID];
if (func != nullptr) {
(*func)(va);
}
}
}
break;
}
default:
break;
}
}
}
msg.erase(0, index + 9);
parseState = ParseState::IDLE;
if (!msg.empty()) {
loop = true;
}
}
} break;
case ParseState::BinaryHeader: {
if (msg.size() >= sizeof(Header)) {
Header header;
if (Header::fromBin(msg, header) &&
header.header_length == sizeof(Header)) {
messageLength =
header.message_length + header.header_length;
parseState = ParseState::BinaryData;
if (msg.size() > header.header_length) {
loop = true;
}
} else {
msg.erase(0, 3);
parseState = ParseState::IDLE;
}
}
} break;
case ParseState::ShortBinaryHeader: {
if (msg.size() >= sizeof(ShortHeader)) {
ShortHeader header;
if (ShortHeader::fromBin(msg, header)) {
messageLength =
header.message_length + sizeof(ShortHeader);
parseState = ParseState::BinaryData;
if (msg.size() > sizeof(ShortHeader)) {
loop = true;
}
} else {
msg.erase(0, 3);
parseState = ParseState::IDLE;
}
}
} break;
case ParseState::BinaryData: {
if (msg.size() >= messageLength) {
parseState = ParseState::BinaryCRC;
if (msg.size() > messageLength) {
loop = true;
}
}
} break;
case ParseState::BinaryCRC: {
if (msg.size() >= messageLength + 4) {
ULong crc = *(ULong *)&msg[messageLength];
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
toggleEndian(&crc);
#endif
ULong calCRC = CalculateBlockCRC32(
messageLength, (unsigned char *)&msg[0]);
if (crc == calCRC) {
MessageID messageID;
switch (dataType) {
case DataType::Binary: {
Header header;
if (Header::fromBin(msg, header)) {
messageID = header.message_ID;
auto va = callbacksType[messageID];
if (va != nullptr) {
memmove(va, &header, sizeof(header));
if (ConstructBINWithoutHeader(
messageID,
std::string(msg.begin() +
sizeof(header),
msg.end()),
va)) {
std::function<void(void *)> *func =
(std::function<void(void *)> *)
callbacks[messageID];
if (func != nullptr) {
(*func)(va);
}
}
}
}
break;
}
case DataType::ShortBinary: {
ShortHeader header;
if (ShortHeader::fromBin(msg, header)) {
messageID = header.message_ID;
auto va = callbacksType[messageID];
if (va != nullptr) {
memmove(va, &header,
sizeof(ShortHeader));
if (ConstructBINWithoutHeader(
messageID,
std::string(
msg.begin() +
sizeof(ShortHeader),
msg.end()),
va)) {
std::function<void(void *)> *func =
(std::function<void(void *)> *)
callbacks[messageID];
if (func != nullptr) {
(*func)(va);
}
}
}
}
break;
}
default:
break;
}
}
msg.erase(0, messageLength + 4);
parseState = ParseState::IDLE;
if (!msg.empty()) {
loop = true;
}
}
} break;
}
} while (loop);
}
void Parser::RegisterAbbreviatedCallback(
std::function<void(std::string)> abbreviatedCallback) {
this->abbreviatedCallback = abbreviatedCallback;
}
} // namespace SPAN