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conv.v
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conv.v
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module conv
union ConversionUnion {
mut:
as_int64 u64
as_int32 u32
as_double64 f64
as_double32 f32
}
// htn64 - DON'T USE, use hton64 instead
@[deprecated: 'use hton64() instead']
@[deprecated_after: '2023-12-31']
pub fn htn64(host u64) u64 {
return hton64(host)
}
// htonf32 converts the 32 bit double `host` to the net format
pub fn htonf32(host f32) f32 {
$if little_endian {
mut convert := ConversionUnion{
as_double32: host
}
convert.as_int32 = unsafe { hton32(convert.as_int32) }
return unsafe { convert.as_double32 }
} $else {
return host
}
}
// htonf64 converts the 64 bit double `host` to the net format
pub fn htonf64(host f64) f64 {
$if little_endian {
mut convert := ConversionUnion{
as_double64: host
}
convert.as_int64 = unsafe { hton64(convert.as_int64) }
return unsafe { convert.as_double64 }
} $else {
return host
}
}
// hton64 converts the 64 bit value `host` to the net format (htonll)
pub fn hton64(host u64) u64 {
$if little_endian {
return reverse_bytes_u64(host)
} $else {
return host
}
}
// htn32 - DON'T USE, use hton32 instead
@[deprecated: 'use hton32() instead']
@[deprecated_after: '2023-12-31']
pub fn htn32(host u32) u32 {
return hton32(host)
}
// hton32 converts the 32 bit value `host` to the net format (htonl)
pub fn hton32(host u32) u32 {
$if little_endian {
return reverse_bytes_u32(host)
} $else {
return host
}
}
// htn16 - DON'T USE, use hton16 instead
@[deprecated: 'use hton16() instead']
@[deprecated_after: '2023-12-31']
pub fn htn16(host u16) u16 {
return hton16(host)
}
// hton16 converts the 16 bit value `host` to the net format (htons)
pub fn hton16(host u16) u16 {
$if little_endian {
return reverse_bytes_u16(host)
} $else {
return host
}
}
// nth64 - DON'T USE, use ntoh64 instead
@[deprecated: 'use ntoh64() instead']
@[deprecated_after: '2023-12-31']
pub fn nth64(net u64) u64 {
return ntoh64(net)
}
// ntoh64 converts the 64 bit value `net` to the host format (ntohll)
pub fn ntoh64(net u64) u64 {
return hton64(net)
}
// nth32 - DON'T USE, use ntoh32 instead
@[deprecated: 'use ntoh32() instead']
@[deprecated_after: '2023-12-31']
pub fn nth32(net u32) u32 {
return ntoh32(net)
}
// ntoh32 converts the 32 bit value `net` to the host format (ntohl)
pub fn ntoh32(net u32) u32 {
return hton32(net)
}
// nth16 - DON'T USE, use ntoh16 instead
@[deprecated: 'use ntoh16() instead']
@[deprecated_after: '2023-12-31']
pub fn nth16(net u16) u16 {
return ntoh16(net)
}
// ntoh16 converts the 16 bit value `net` to the host format (ntohs)
pub fn ntoh16(net u16) u16 {
return hton16(net)
}
// u64tovarint converts the given 64 bit number `n`, where n < 2^62 to a byte array,
// using the variable length unsigned integer encoding from:
// https://datatracker.ietf.org/doc/html/rfc9000#section-16 .
// The returned array length .len, will be in [1,2,4,8] .
pub fn u64tovarint(n u64) ![]u8 {
if n > u64(1) << 62 {
return error('cannot encode more than 2^62-1')
}
msb := match true {
n < 64 {
u8(0b00)
}
n < 16384 {
u8(0b01)
}
n < 1073741824 {
u8(0b10)
}
else {
u8(0b11)
}
}
len := 1 << msb
mut result := []u8{len: len}
mut tn := n
for i in 0 .. len {
result[len - 1 - i] = u8(tn % 256)
tn /= 256
}
result[0] |= msb << 6
return result
}
// varinttou64 parses a variable length number from the start of the
// given byte array `b`. If it succeeds, it returns the decoded number,
// and the length of the parsed byte span.
pub fn varinttou64(b []u8) !(u64, u8) {
if b.len == 0 {
return error('cannot parse vluint from empty byte array')
}
msb := b[0] >> 6
len := u8(1 << msb)
if len > b.len {
return error('expected ${len} bytes but got ${b.len} bytes')
}
mut n := u64(b[0] & 0b00111111)
for i in 1 .. len {
n = n * 256 + b[i]
}
return n, len
}
// reverse_bytes_u64 reverse a u64's byte order
@[inline]
pub fn reverse_bytes_u64(a u64) u64 {
// vfmt off
return ((a >> 56) & 0x00000000_000000FF) |
((a >> 40) & 0x00000000_0000FF00) |
((a >> 24) & 0x00000000_00FF0000) |
((a >> 8) & 0x00000000_FF000000) |
((a << 8) & 0x000000FF_00000000) |
((a << 24) & 0x0000FF00_00000000) |
((a << 40) & 0x00FF0000_00000000) |
((a << 56) & 0xFF000000_00000000)
// vfmt on
}
// reverse_bytes_u32 reverse a u32's byte order
@[inline]
pub fn reverse_bytes_u32(a u32) u32 {
// vfmt off
return ((a >> 24) & 0x0000_00FF) |
((a >> 8) & 0x0000_FF00) |
((a << 8) & 0x00FF_0000) |
((a << 24) & 0xFF00_0000)
// vfmt on
}
// reverse_bytes_u16 reverse a u16's byte order
@[inline]
pub fn reverse_bytes_u16(a u16) u16 {
// vfmt off
return ((a >> 8) & 0x00FF) |
((a << 8) & 0xFF00)
// vfmt on
}