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|
package bytes
import (
"github.com/gofiber/utils/v2/internal/caseconv"
)
// ToLower converts an ASCII byte slice to lower-case without modifying the input.
func ToLower(b []byte) []byte {
n := len(b)
if n == 0 {
return b
}
table := caseconv.ToLowerTable
i := 0
for i < n {
c := b[i]
low := table[c]
if low != c {
dst := make([]byte, n)
copy(dst, b[:i])
dst[i] = low
i++
limit := i + ((n - i) &^ 3)
for i < limit {
dst[i+0] = table[b[i+0]]
dst[i+1] = table[b[i+1]]
dst[i+2] = table[b[i+2]]
dst[i+3] = table[b[i+3]]
i += 4
}
for i < n {
dst[i] = table[b[i]]
i++
}
return dst
}
i++
}
return b
}
// ToUpper converts an ASCII byte slice to upper-case without modifying the input.
func ToUpper(b []byte) []byte {
n := len(b)
if n == 0 {
return b
}
table := caseconv.ToUpperTable
i := 0
for i < n {
c := b[i]
up := table[c]
if up != c {
dst := make([]byte, n)
copy(dst, b[:i])
dst[i] = up
i++
limit := i + ((n - i) &^ 3)
for i < limit {
dst[i+0] = table[b[i+0]]
dst[i+1] = table[b[i+1]]
dst[i+2] = table[b[i+2]]
dst[i+3] = table[b[i+3]]
i += 4
}
for i < n {
dst[i] = table[b[i]]
i++
}
return dst
}
i++
}
return b
}
// UnsafeToLower converts an ASCII byte slice to lower-case in-place.
// The passed slice content is modified and the same slice is returned.
func UnsafeToLower(b []byte) []byte {
table := caseconv.ToLowerTable
n := len(b)
i := 0
limit := n &^ 3
for i < limit {
b0 := b[i+0]
b1 := b[i+1]
b2 := b[i+2]
b3 := b[i+3]
b[i+0] = table[b0]
b[i+1] = table[b1]
b[i+2] = table[b2]
b[i+3] = table[b3]
i += 4
}
for i < n {
b[i] = table[b[i]]
i++
}
return b
}
// UnsafeToUpper converts an ASCII byte slice to upper-case in-place.
// The passed slice content is modified and the same slice is returned.
func UnsafeToUpper(b []byte) []byte {
table := caseconv.ToUpperTable
n := len(b)
i := 0
limit := n &^ 3
for i < limit {
b0 := b[i+0]
b1 := b[i+1]
b2 := b[i+2]
b3 := b[i+3]
b[i+0] = table[b0]
b[i+1] = table[b1]
b[i+2] = table[b2]
b[i+3] = table[b3]
i += 4
}
for i < n {
b[i] = table[b[i]]
i++
}
return b
}
|
