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Diffstat (limited to '')
-rw-r--r-- | utility.cpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/utility.cpp b/utility.cpp new file mode 100644 index 0000000..fffe2f8 --- /dev/null +++ b/utility.cpp @@ -0,0 +1,69 @@ +// +// Created by lag1924 on 24.03.17. +// +#include "utility.h" + +int VarIntRead(unsigned char *data, size_t &readed) { + readed = 0; + int result = 0; + char read; + do { + read = data[readed]; + int value = (read & 0b01111111); + result |= (value << (7 * readed)); + + readed++; + if (readed > 5) { + throw "VarInt is too big"; + } + } while ((read & 0b10000000) != 0); + + return result; +} + +size_t VarIntWrite(unsigned int value, unsigned char *data) { + size_t len = 0; + do { + unsigned char temp = (unsigned char) (value & 0b01111111); + value >>= 7; + if (value != 0) { + temp |= 0b10000000; + } + data[len] = temp; + len++; + } while (value != 0); + return len; +} + +long long int ReadVarLong(unsigned char *data, int &readed) { + readed = 0; + long long result = 0; + unsigned char read; + do { + read = data[readed]; + long long value = (read & 0b01111111); + result |= (value << (7 * readed)); + + readed++; + if (readed > 10) { + throw "VarLong is too big"; + } + } while ((read & 0b10000000) != 0); + return result; +} + +unsigned char *WriteVarLong(unsigned long long int value, int &len) { + unsigned char *data = new unsigned char[10]; + len = 0; + do { + unsigned char temp = (unsigned char) (value & 0b01111111); + value >>= 7; + if (value != 0) { + temp |= 0b10000000; + } + data[len] = temp; + len++; + } while (value != 0); + + return data; +}
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