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bitfield: fix bit order

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This commit is contained in:
Silvan Büdenbender
2019-11-19 01:32:44 +01:00
committed by Alexander Medvednikov
parent 20d6492775
commit 94b36250a1
2 changed files with 8 additions and 27 deletions
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27
vlib/bitfield/bitfield.v
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@ -13,7 +13,7 @@ Bit arrays are stored in data structures called 'BitField'. The structure is
provides API (functions and methods) for accessing and modifying bit arrays.
*/
struct BitField {
pub struct BitField {
mut:
size int
//field *u32
@ -77,36 +77,19 @@ fn cleartail(instance mut BitField) {
// public functions
// from_bytes() converts a byte arry into a bitfield.
// Be aware of possible trailing zeroes being added
// due to the underlying 32bit int containers.
// from_bytes() converts a byte array into a bitfield.
pub fn from_bytes(input []byte) BitField {
mut output := new(input.len * 8)
for i, b in input {
pos := i / 4
match i % 4 {
0 {
output.field[pos] = output.field[pos] | (u32(b) << 24)
}
1 {
output.field[pos] = output.field[pos] | (u32(b) << 16)
}
2 {
output.field[pos] = output.field[pos] | (u32(b) << 8)
}
3 {
output.field[pos] = output.field[pos] | u32(b)
}
}
output.field[i / 4] |= u32(b) << ((i % 4) * 8)
}
return output
}
// str2bf() converts a string of characters ('0' and '1') to a bit
// from_string() converts a string of characters ('0' and '1') to a bit
// array. Any character different from '0' is treated as '1'.
pub fn str2bf(input string) BitField {
pub fn from_string(input string) BitField {
mut output := new(input.len)
for i := 0; i < input.len; i++ {
if input[i] != 48 {