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ADDED: EncodeDataBase64() and DecodeDataBase64()

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raysan5 2021-10-18 14:10:51 +02:00
parent bc47d36e90
commit 2ec8ce649a
2 changed files with 97 additions and 0 deletions
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3
src/raylib.h
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@ -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

94
src/rcore.c
View file

@ -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)