69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
/*
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Copyright 2024 Josh Deprez
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package aurp
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import (
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"io"
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)
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// wtacc is a helper for io.WriterTo implementations.
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// It sacrifices early returns for a shorter syntax. However, it won't continue
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// writing to the destination writer after detecting an error.
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type wtacc struct {
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w io.Writer
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n int64
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err error
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}
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func acc(w io.Writer) wtacc { return wtacc{w: w} }
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func (a *wtacc) ret() (int64, error) {
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return a.n, a.err
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}
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func (a *wtacc) write8(x uint8) {
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a.write([]byte{x})
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}
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func (a *wtacc) write16(x uint16) {
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// Could do this with:
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// binary.Write(a.w, binary.BigEndian, x)
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// - but don't wanna
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a.write([]byte{
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byte(x >> 8),
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byte(x & 0xff),
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})
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}
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func (a *wtacc) write(b []byte) {
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if a.err != nil {
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return
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}
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n, err := a.w.Write(b)
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a.n += int64(n)
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a.err = err
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}
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func (a *wtacc) writeTo(wt io.WriterTo) {
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if a.err != nil {
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return
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}
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n, err := wt.WriteTo(a.w)
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a.n += n
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a.err = err
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}
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