191 lines
6.6 KiB
C++
191 lines
6.6 KiB
C++
#include "./stringconversion.h"
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#include "../misc/memory.h"
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#include <sstream>
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#include <iomanip>
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using namespace std;
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namespace ConversionUtilities
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{
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/*!
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* \brief Truncates all characters after the first occurrence of the
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* specified \a terminationChar and the termination character as well.
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*/
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void truncateString(string &str, char terminationChar)
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{
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string::size_type firstNullByte = str.find(terminationChar);
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if(firstNullByte != string::npos) {
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str.resize(firstNullByte);
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}
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}
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/*!
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* \brief Converts the specified data size in byte to its equivalent std::string representation.
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*
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* The unit with appropriate binary prefix will be appended.
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*/
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string dataSizeToString(uint64 sizeInByte, bool includeByte)
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{
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stringstream res(stringstream::in | stringstream::out);
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res.setf(ios::fixed, ios::floatfield);
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res << setprecision(2);
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if (sizeInByte < 1024LL) {
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res << sizeInByte << " bytes";
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} else if (sizeInByte < 1048576LL) {
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res << (static_cast<double>(sizeInByte) / 1024.0) << " KiB";
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} else if (sizeInByte < 1073741824LL) {
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res << (static_cast<double>(sizeInByte) / 1048576.0) << " MiB";
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} else if (sizeInByte < 1099511627776LL) {
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res << (static_cast<double>(sizeInByte) / 1073741824.0) << " GiB";
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} else {
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res << (static_cast<double>(sizeInByte) / 1099511627776.0) << " TiB";
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}
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if(includeByte && sizeInByte > 1024LL) {
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res << ' ' << '(' << sizeInByte << " byte)";
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}
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return res.str();
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}
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/*!
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* \brief Converts the specified bitrate in kbit/s to its equivalent std::string representation.
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*
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* The unit with appropriate binary prefix will be appended.
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*
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* \param bitrateInKbitsPerSecond Specifies the bitrate in kbit/s.
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* \param useIecBinaryPrefixes Indicates whether IEC binary prefixes should be used (eg. KiB/s).
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*
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* \sa <a href="http://en.wikipedia.org/wiki/Binary_prefix">Binary prefix - Wikipedia</a>
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*/
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string bitrateToString(double bitrateInKbitsPerSecond, bool useIecBinaryPrefixes)
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{
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stringstream res(stringstream::in | stringstream::out);
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res << setprecision(3);
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if (useIecBinaryPrefixes) {
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if (bitrateInKbitsPerSecond < 8.0) {
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res << (bitrateInKbitsPerSecond * 125.0) << " byte/s";
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} else if (bitrateInKbitsPerSecond < 8000.0) {
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res << (bitrateInKbitsPerSecond * 0.125) << " KiB/s";
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} else if (bitrateInKbitsPerSecond < 8000000.0) {
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res << (bitrateInKbitsPerSecond * 0.000125) << " MiB/s";
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} else {
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res << (bitrateInKbitsPerSecond * 0.000000125) << " GiB/s";
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}
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} else {
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if (bitrateInKbitsPerSecond < 1.0) {
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res << (bitrateInKbitsPerSecond * 1000.0) << " bit/s";
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} else if (bitrateInKbitsPerSecond < 1000.0) {
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res << (bitrateInKbitsPerSecond) << " kbit/s";
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} else if (bitrateInKbitsPerSecond < 1000000.0) {
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res << (bitrateInKbitsPerSecond * 0.001) << " Mbit/s";
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} else {
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res << (bitrateInKbitsPerSecond * 0.000001) << " Gbit/s";
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}
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}
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return res.str();
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}
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const char *const base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const char base64Pad = '=';
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/*!
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* \brief Encodes the specified \a data to Base64.
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*/
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LIB_EXPORT string encodeBase64(const byte *data, uint32 dataSize)
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{
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string encoded;
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byte mod = dataSize % 3;
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encoded.reserve(((dataSize / 3) + (mod > 0)) * 4);
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uint32 temp;
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for(const byte *end = --data + dataSize - mod; data != end; ) {
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temp = *++data << 16;
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temp |= *++data << 8;
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temp |= *++data;
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encoded.push_back(base64Chars[(temp & 0x00FC0000) >> 18]);
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encoded.push_back(base64Chars[(temp & 0x0003F000) >> 12]);
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encoded.push_back(base64Chars[(temp & 0x00000FC0) >> 6 ]);
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encoded.push_back(base64Chars[(temp & 0x0000003F) ]);
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}
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switch(mod) {
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case 1:
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temp = *++data << 16;
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encoded.push_back(base64Chars[(temp & 0x00FC0000) >> 18]);
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encoded.push_back(base64Chars[(temp & 0x0003F000) >> 12]);
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encoded.push_back(base64Pad);
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encoded.push_back(base64Pad);
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break;
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case 2:
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temp = *++data << 16;
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temp |= *++data << 8;
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encoded.push_back(base64Chars[(temp & 0x00FC0000) >> 18]);
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encoded.push_back(base64Chars[(temp & 0x0003F000) >> 12]);
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encoded.push_back(base64Chars[(temp & 0x00000FC0) >> 6 ]);
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encoded.push_back(base64Pad);
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break;
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}
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return encoded;
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}
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/*!
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* \brief Decodes the specified Base64 encoded string.
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* \throw Throws a ConversionException if the specified string is no valid Base64.
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*/
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LIB_EXPORT pair<unique_ptr<byte[]>, uint32> decodeBase64(const char *encodedStr, const uint32 strSize)
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{
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if(strSize % 4) {
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throw ConversionException("invalid size of base64");
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}
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uint32 decodedSize = (strSize / 4) * 3;
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const char *const end = encodedStr + strSize;
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if(strSize) {
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if(*(end - 1) == base64Pad) {
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--decodedSize;
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}
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if(*(end - 2) == base64Pad) {
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--decodedSize;
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}
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}
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auto buffer = make_unique<byte[]>(decodedSize);
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auto *iter = buffer.get() - 1;
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while(encodedStr < end) {
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uint32 temp = 0;
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for(byte quantumPos = 0; quantumPos < 4; ++quantumPos, ++encodedStr) {
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temp <<= 6;
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if(*encodedStr >= 'A' && *encodedStr <= 'Z') {
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temp |= *encodedStr - 'A';
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} else if(*encodedStr >= 'a' && *encodedStr <= 'z') {
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temp |= *encodedStr - 'a' + 26;
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} else if(*encodedStr >= '0' && *encodedStr <= '9') {
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temp |= *encodedStr - '0' + 2 * 26;
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} else if(*encodedStr == '+') {
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temp |= 2 * 26 + 10;
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} else if(*encodedStr == '/') {
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temp |= 2 * 26 + 10 + 1;
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} else if(*encodedStr == base64Pad) {
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switch(end - encodedStr) {
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case 1:
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*++iter = (temp >> 16) & 0xFF;
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*++iter = (temp >> 8) & 0xFF;
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return make_pair(move(buffer), decodedSize);
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case 2:
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*++iter = (temp >> 10) & 0xFF;
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return make_pair(move(buffer), decodedSize);
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default:
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throw ConversionException("invalid padding in base64");
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}
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} else {
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throw ConversionException("invalid character in base64");
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}
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}
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*++iter = (temp >> 16) & 0xFF;
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*++iter = (temp >> 8) & 0xFF;
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*++iter = (temp ) & 0xFF;
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}
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return make_pair(move(buffer), decodedSize);
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}
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}
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