diff options
Diffstat (limited to 'bit.c')
-rw-r--r-- | bit.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/bit.c b/bit.c new file mode 100644 index 000000000000..68907c0ed06e --- /dev/null +++ b/bit.c @@ -0,0 +1,49 @@ +#include "ficl.h" + +int ficlBitGet(const unsigned char *bits, size_t index) + { + int byteIndex = index >> 3; + int bitIndex = index & 7; + unsigned char mask = (unsigned char)(128 >> bitIndex); + + return ((mask & bits[byteIndex]) ? 1 : 0); + } + + + +void ficlBitSet(unsigned char *bits, size_t index, int value) + { + int byteIndex = index >> 3; + int bitIndex = index & 7; + unsigned char mask = (unsigned char)(128 >> bitIndex); + + if (value) + bits[byteIndex] |= mask; + else + bits[byteIndex] &= ~mask; + } + + +void ficlBitGetString(unsigned char *destination, const unsigned char *source, int offset, int count, int destAlignment) + { + int bit = destAlignment - count; + while (count--) + ficlBitSet(destination, bit++, ficlBitGet(source, offset++)); + } + + +/* +** This will actually work correctly *regardless* of the local architecture. +** --lch +**/ +ficlUnsigned16 ficlNetworkUnsigned16(ficlUnsigned16 number) +{ + ficlUnsigned8 *pointer = (ficlUnsigned8 *)&number; + return (ficlUnsigned16)(((ficlUnsigned16)(pointer[0] << 8)) | (pointer[1])); +} + +ficlUnsigned32 ficlNetworkUnsigned32(ficlUnsigned32 number) +{ + ficlUnsigned16 *pointer = (ficlUnsigned16 *)&number; + return ((ficlUnsigned32)(ficlNetworkUnsigned16(pointer[0]) << 16)) | ficlNetworkUnsigned16(pointer[1]); +} |