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remove some of API

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This commit is contained in:
soypat
2024-01-14 22:50:42 -03:00
parent 97ef4986ba
commit 845bd6fe93
3 changed files with 53 additions and 20 deletions
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sd/definitions.go
+14 -8
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@@ -88,14 +88,17 @@ type CSD struct {
data [16]byte
}
// CSDv1 is the Card Specific Data register for V1 devices. See [CSD] for more info.
type CSDv1 struct {
CSD
}
// CSDv2 is the Card Specific Data register for V2 devices. See [CSD] for more info.
type CSDv2 struct {
CSD
}
// DecodeCSD decodes the CSD from a 16-byte slice.
func DecodeCSD(b []byte) (CSD, error) {
if len(b) < 16 {
return CSD{}, io.ErrShortBuffer
@@ -108,18 +111,22 @@ func DecodeCSD(b []byte) (CSD, error) {
return csd, nil
}
// CSDStructure returns the version of the CSD structure.
func (c *CSD) CSDStructure() uint8 { return c.data[0] >> 6 }
// csdStructure returns the version of the CSD structure.
func (c *CSD) csdStructure() uint8 { return c.data[0] >> 6 }
// Version returns the version of the CSD structure. Effectively returns 1+CSDStructure.
func (c *CSD) Version() uint8 { return 1 + c.csdStructure() }
// MustV1 returns the CSD as a CSDv1. Panics if the CSD is not version 1.0.
func (c CSD) MustV1() CSDv1 {
if c.CSDStructure() != 0 {
if c.csdStructure() != 0 {
panic("CSD is not version 1.0")
}
return CSDv1{CSD: c}
}
func (c CSD) MustV2() CSDv2 {
if c.CSDStructure() != 1 {
if c.csdStructure() != 1 {
panic("CSD is not version 2.0")
}
return CSDv2{CSD: c}
@@ -215,7 +222,7 @@ func (c *CSD) IsCopy() bool { return c.data[14]&(1<<6) != 0 }
func (c *CSD) FileFormatGroup() bool { return c.data[14]&(1<<7) != 0 }
func (c *CSD) DeviceCapacity() (size uint64) {
switch c.CSDStructure() {
switch c.csdStructure() {
case 0:
v1 := c.MustV1()
size = uint64(v1.DeviceCapacity())
@@ -283,7 +290,7 @@ func (c *CSDv1) VddWriteCurrent() (min, max uint8) {
}
func (c *CSD) String() string {
version := c.CSDStructure() + 1
version := c.csdStructure() + 1
if version > 2 {
return "<unsupported CSD version>"
}
@@ -298,7 +305,7 @@ func (c *CSDv1) String() string { return c.CSD.String() }
func (c *CSDv2) String() string { return c.CSD.String() }
func (c *CSD) appendf(b []byte, delim byte) []byte {
b = appendnum(b, "Version", uint64(c.CSDStructure()+1), delim)
b = appendnum(b, "Version", uint64(c.Version()), delim)
b = appendnum(b, "Capacity(bytes)", c.DeviceCapacity(), delim)
b = appendnum(b, "TimeAccess_ns", uint64(c.TAAC().AccessTime()), delim)
b = appendnum(b, "NSAC", uint64(c.NSAC()), delim)
@@ -466,7 +473,6 @@ func b2u8(b bool) uint8 {
// CRC16 computes the CRC16 checksum for a given payload using the CRC-16-CCITT polynomial.
func CRC16(buf []byte) (crc uint16) {
const poly uint16 = 0x1021 // Generator polynomial G(x) = x^16 + x^12 + x^5 + 1
for _, b := range buf {
crc ^= (uint16(b) << 8) // Shift byte into MSB of crc
for i := 0; i < 8; i++ { // Process each bit