1 #include "bej_common.h" 2 3 uint64_t bejGetUnsignedInteger(const uint8_t* bytes, uint8_t numOfBytes) 4 { 5 uint64_t num = 0; 6 for (uint8_t i = 0; i < numOfBytes; ++i) 7 { 8 num |= (uint64_t)(*(bytes + i)) << (i * 8); 9 } 10 return num; 11 } 12 13 uint64_t bejGetNnint(const uint8_t* nnint) 14 { 15 // In nnint, first byte indicate how many bytes are there. Remaining bytes 16 // represent the value in little-endian format. 17 const uint8_t size = *nnint; 18 return bejGetUnsignedInteger(nnint + sizeof(uint8_t), size); 19 } 20 21 uint8_t bejGetNnintSize(const uint8_t* nnint) 22 { 23 // In nnint, first byte indicate how many bytes are there. 24 return *nnint + sizeof(uint8_t); 25 } 26 27 uint8_t bejNnintEncodingSizeOfUInt(uint64_t val) 28 { 29 uint8_t bytes = 0; 30 do 31 { 32 // Even if the value is 0, we need a byte for that. 33 ++bytes; 34 val = val >> 8; 35 } while (val != 0); 36 // Need 1 byte to add the nnint length. 37 return bytes + 1; 38 } 39 40 uint8_t bejNnintLengthFieldOfUInt(uint64_t val) 41 { 42 // From the size of the encoded value, we need 1 byte for the length field. 43 return bejNnintEncodingSizeOfUInt(val) - 1; 44 } 45