Defined the new OutMessage API.
parent
3371ab70ac
commit
c0e60edb32
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@ -15,7 +15,6 @@
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package buffer
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package buffer
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import (
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import (
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"reflect"
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"unsafe"
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"unsafe"
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"github.com/jacobsa/fuse/internal/fusekernel"
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"github.com/jacobsa/fuse/internal/fusekernel"
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@ -35,54 +34,47 @@ type OutMessage struct {
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storage [outMessageSize]byte
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storage [outMessageSize]byte
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}
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}
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// Create a new buffer whose initial contents are a zeroed fusekernel.OutHeader
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// Reset the message so that it is ready to be used again. Afterward, the
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// message, and with room enough to grow by extra bytes.
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// contents are solely a zeroed header.
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func NewOutMessage(extra uintptr) (b OutMessage) {
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func (m *OutMessage) Reset() {
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const headerSize = unsafe.Sizeof(fusekernel.OutHeader{})
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panic("TODO")
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b.slice = make([]byte, headerSize, headerSize+extra)
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return
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}
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}
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// Return a pointer to the header at the start of the buffer.
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// Return a pointer to the header at the start of the message.
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func (b *OutMessage) OutHeader() (h *fusekernel.OutHeader) {
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func (b *OutMessage) OutHeader() (h *fusekernel.OutHeader) {
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&b.slice))
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panic("TODO")
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h = (*fusekernel.OutHeader)(unsafe.Pointer(sh.Data))
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return
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}
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}
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// Grow the buffer by the supplied number of bytes, returning a pointer to the
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// Grow the buffer by the supplied number of bytes, returning a pointer to the
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// start of the new segment. The sum of the arguments given to Grow must not
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// start of the new segment, which is zeroed. If there is no space left, return
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// exceed the argument given to New when creating the buffer.
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// the nil pointer.
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func (b *OutMessage) Grow(size uintptr) (p unsafe.Pointer) {
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func (b *OutMessage) Grow(size uintptr) (p unsafe.Pointer) {
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sh := (*reflect.SliceHeader)(unsafe.Pointer(&b.slice))
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panic("TODO")
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p = unsafe.Pointer(sh.Data + uintptr(sh.Len))
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b.slice = b.slice[:len(b.slice)+int(size)]
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return
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}
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}
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// Equivalent to growing by the length of p, then copying p into the new segment.
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// Equivalent to Grow, except the new segment is not zeroed. Use with caution!
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func (b *OutMessage) GrowNoZero(size uintptr) (p unsafe.Pointer) {
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panic("TODO")
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}
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// Equivalent to growing by the length of p, then copying p over the new
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// segment.
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func (b *OutMessage) Append(p []byte) {
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func (b *OutMessage) Append(p []byte) {
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sh := reflect.SliceHeader{
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panic("TODO")
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Data: uintptr(b.Grow(uintptr(len(p)))),
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Len: len(p),
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Cap: len(p),
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}
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copy(*(*[]byte)(unsafe.Pointer(&sh)), p)
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}
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}
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// Equivalent to growing by the length of s, then copying s into the new segment.
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// Equivalent to growing by the length of s, then copying s over the new
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// segment.
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func (b *OutMessage) AppendString(s string) {
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func (b *OutMessage) AppendString(s string) {
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sh := reflect.SliceHeader{
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panic("TODO")
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Data: uintptr(b.Grow(uintptr(len(s)))),
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}
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Len: len(s),
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Cap: len(s),
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}
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copy(*(*[]byte)(unsafe.Pointer(&sh)), s)
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// Return the current size of the buffer.
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func (b *OutMessage) Len() int {
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panic("TODO")
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}
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}
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// Return a reference to the current contents of the buffer.
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// Return a reference to the current contents of the buffer.
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func (b *OutMessage) Bytes() []byte {
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func (b *OutMessage) Bytes() []byte {
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return b.slice
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panic("TODO")
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}
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}
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