Přemysl Janouch
48fb710f35
AUTHORS, CONTRIBUTORS: still useful, add people from git log, clean up. LICENSE: Google doesn't really grant you shit anymore. The EU doesn't have software patents either, so it doesn't affect me directly. README, doc.go: erase mentions of unmaintained xgbutil.
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package nexgb
|
|
|
|
/*
|
|
help.go is meant to contain a rough hodge podge of functions that are mainly
|
|
used in the auto generated code. Indeed, several functions here are simple
|
|
wrappers so that the sub-packages don't need to be smart about which stdlib
|
|
packages to import.
|
|
|
|
Also, the 'Get..' and 'Put..' functions are used through the core xgb package
|
|
too. (xgbutil uses them too.)
|
|
*/
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// StringsJoin is an alias to strings.Join. It allows us to avoid having to
|
|
// import 'strings' in each of the generated Go files.
|
|
func StringsJoin(ss []string, sep string) string {
|
|
return strings.Join(ss, sep)
|
|
}
|
|
|
|
// Sprintf is so we don't need to import 'fmt' in the generated Go files.
|
|
func Sprintf(format string, v ...interface{}) string {
|
|
return fmt.Sprintf(format, v...)
|
|
}
|
|
|
|
// Errorf is just a wrapper for fmt.Errorf. Exists for the same reason
|
|
// that 'stringsJoin' and 'sprintf' exists.
|
|
func Errorf(format string, v ...interface{}) error {
|
|
return fmt.Errorf(format, v...)
|
|
}
|
|
|
|
// Pad a length to align on 4 bytes.
|
|
func Pad(n int) int {
|
|
return (n + 3) & ^3
|
|
}
|
|
|
|
// PopCount counts the number of bits set in a value list mask.
|
|
func PopCount(mask0 int) int {
|
|
mask := uint32(mask0)
|
|
n := 0
|
|
for i := uint32(0); i < 32; i++ {
|
|
if mask&(1<<i) != 0 {
|
|
n++
|
|
}
|
|
}
|
|
return n
|
|
}
|
|
|
|
// Put16 takes a 16 bit integer and copies it into a byte slice.
|
|
func Put16(buf []byte, v uint16) {
|
|
buf[0] = byte(v)
|
|
buf[1] = byte(v >> 8)
|
|
}
|
|
|
|
// Put32 takes a 32 bit integer and copies it into a byte slice.
|
|
func Put32(buf []byte, v uint32) {
|
|
buf[0] = byte(v)
|
|
buf[1] = byte(v >> 8)
|
|
buf[2] = byte(v >> 16)
|
|
buf[3] = byte(v >> 24)
|
|
}
|
|
|
|
// Put64 takes a 64 bit integer and copies it into a byte slice.
|
|
func Put64(buf []byte, v uint64) {
|
|
buf[0] = byte(v)
|
|
buf[1] = byte(v >> 8)
|
|
buf[2] = byte(v >> 16)
|
|
buf[3] = byte(v >> 24)
|
|
buf[4] = byte(v >> 32)
|
|
buf[5] = byte(v >> 40)
|
|
buf[6] = byte(v >> 48)
|
|
buf[7] = byte(v >> 56)
|
|
}
|
|
|
|
// Get16 constructs a 16 bit integer from the beginning of a byte slice.
|
|
func Get16(buf []byte) uint16 {
|
|
v := uint16(buf[0])
|
|
v |= uint16(buf[1]) << 8
|
|
return v
|
|
}
|
|
|
|
// Get32 constructs a 32 bit integer from the beginning of a byte slice.
|
|
func Get32(buf []byte) uint32 {
|
|
v := uint32(buf[0])
|
|
v |= uint32(buf[1]) << 8
|
|
v |= uint32(buf[2]) << 16
|
|
v |= uint32(buf[3]) << 24
|
|
return v
|
|
}
|
|
|
|
// Get64 constructs a 64 bit integer from the beginning of a byte slice.
|
|
func Get64(buf []byte) uint64 {
|
|
v := uint64(buf[0])
|
|
v |= uint64(buf[1]) << 8
|
|
v |= uint64(buf[2]) << 16
|
|
v |= uint64(buf[3]) << 24
|
|
v |= uint64(buf[4]) << 32
|
|
v |= uint64(buf[5]) << 40
|
|
v |= uint64(buf[6]) << 48
|
|
v |= uint64(buf[7]) << 56
|
|
return v
|
|
}
|