diff --git a/src/raylib.h b/src/raylib.h index dd7a68bb..9f6ce25d 100644 --- a/src/raylib.h +++ b/src/raylib.h @@ -1052,8 +1052,11 @@ RLAPI char **GetDroppedFiles(int *count); // Get dropped RLAPI void ClearDroppedFiles(void); // Clear dropped files paths buffer (free memory) RLAPI long GetFileModTime(const char *fileName); // Get file modification time (last write time) +// Compression/Encoding functionality RLAPI unsigned char *CompressData(unsigned char *data, int dataLength, int *compDataLength); // Compress data (DEFLATE algorithm) RLAPI unsigned char *DecompressData(unsigned char *compData, int compDataLength, int *dataLength); // Decompress data (DEFLATE algorithm) +RLAPI char *EncodeDataBase64(const unsigned char *data, int dataLength, int *outputLength); // Encode data to Base64 string +RLAPI unsigned char *DecodeDataBase64(unsigned char *data, int *outputLength); // Decode Base64 string data // Persistent storage management RLAPI bool SaveStorageValue(unsigned int position, int value); // Save integer value to storage file (to defined position), returns true on success diff --git a/src/rcore.c b/src/rcore.c index e9e30726..0af89cf7 100644 --- a/src/rcore.c +++ b/src/rcore.c @@ -3038,6 +3038,100 @@ unsigned char *DecompressData(unsigned char *compData, int compDataLength, int * return data; } +// Encode data to Base64 string +char *EncodeDataBase64(const unsigned char *data, int dataLength, int *outputLength) +{ + static const unsigned char base64encodeTable[] = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', + 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', + 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' + }; + + static const int modTable[] = { 0, 2, 1 }; + + *outputLength = 4*((dataLength + 2)/3); + + char *encodedData = RL_MALLOC(*outputLength); + + if (encodedData == NULL) return NULL; + + for (int i = 0, j = 0; i < dataLength;) + { + unsigned int octetA = (i < dataLength)? (unsigned char)data[i++] : 0; + unsigned int octetB = (i < dataLength)? (unsigned char)data[i++] : 0; + unsigned int octetC = (i < dataLength)? (unsigned char)data[i++] : 0; + + unsigned int triple = (octetA << 0x10) + (octetB << 0x08) + octetC; + + encodedData[j++] = base64encodeTable[(triple >> 3*6) & 0x3F]; + encodedData[j++] = base64encodeTable[(triple >> 2*6) & 0x3F]; + encodedData[j++] = base64encodeTable[(triple >> 1*6) & 0x3F]; + encodedData[j++] = base64encodeTable[(triple >> 0*6) & 0x3F]; + } + + for (int i = 0; i < modTable[dataLength%3]; i++) encodedData[*outputLength - 1 - i] = '='; + + return encodedData; +} + +// Decode Base64 string data +unsigned char *DecodeDataBase64(unsigned char *data, int *outputLength) +{ + static const unsigned char base64decodeTable[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, + 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, + 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 + }; + + // Get output size of Base64 input data + int outLength = 0; + for (int i = 0; data[4*i] != 0; i++) + { + if (data[4*i + 3] == '=') + { + if (data[4*i + 2] == '=') outLength += 1; + else outLength += 2; + } + else outLength += 3; + } + + // Allocate memory to store decoded Base64 data + unsigned char *decodedData = (unsigned char *)RL_MALLOC(outLength); + + for (int i = 0; i < outLength/3; i++) + { + unsigned char a = base64decodeTable[(int)data[4*i]]; + unsigned char b = base64decodeTable[(int)data[4*i + 1]]; + unsigned char c = base64decodeTable[(int)data[4*i + 2]]; + unsigned char d = base64decodeTable[(int)data[4*i + 3]]; + + decodedData[3*i] = (a << 2) | (b >> 4); + decodedData[3*i + 1] = (b << 4) | (c >> 2); + decodedData[3*i + 2] = (c << 6) | d; + } + + if (outLength%3 == 1) + { + int n = outLength/3; + unsigned char a = base64decodeTable[(int)data[4*n]]; + unsigned char b = base64decodeTable[(int)data[4*n + 1]]; + decodedData[outLength - 1] = (a << 2) | (b >> 4); + } + else if (outLength%3 == 2) + { + int n = outLength/3; + unsigned char a = base64decodeTable[(int)data[4*n]]; + unsigned char b = base64decodeTable[(int)data[4*n + 1]]; + unsigned char c = base64decodeTable[(int)data[4*n + 2]]; + decodedData[outLength - 2] = (a << 2) | (b >> 4); + decodedData[outLength - 1] = (b << 4) | (c >> 2); + } + + *outputLength = outLength; + return decodedData; +} + // Save integer value to storage file (to defined position) // NOTE: Storage positions is directly related to file memory layout (4 bytes each integer) bool SaveStorageValue(unsigned int position, int value)