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log.go
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log.go
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/*
* Copyright 2023 InfAI (CC SES)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package util
import (
"encoding/binary"
"fmt"
"io"
)
type RCWrapper struct {
ReadCloser io.ReadCloser
notMultiplexed bool
remainder int
}
func (c *RCWrapper) Close() error {
return c.ReadCloser.Close()
}
func (c *RCWrapper) Read(p []byte) (n int, err error) {
pLen := len(p)
if !c.notMultiplexed {
var pRemainder int
for n < pLen {
pRemainder = pLen - n
var size int
var n2 int
if c.remainder == 0 {
header := make([]byte, 8)
if n2, err = c.ReadCloser.Read(header); err != nil {
break
}
streamType := header[0]
if streamType < 1 || streamType > 2 {
if !c.notMultiplexed {
c.notMultiplexed = true
n = n2
copy(p, header)
break
}
err = fmt.Errorf("unkown stream type '%d'", streamType)
break
}
outputLen := int(binary.BigEndian.Uint32(header[4:]))
if outputLen < pRemainder {
size = outputLen
} else {
size = pRemainder
c.remainder = outputLen - pRemainder
}
} else {
if c.remainder < pRemainder {
size = c.remainder
c.remainder = 0
} else {
size = pRemainder
c.remainder = c.remainder - pRemainder
}
}
n2, err = c.ReadCloser.Read(p[n : n+size])
n += n2
if err != nil {
break
}
}
}
if c.notMultiplexed {
for n < pLen {
var n2 int
n2, err = c.ReadCloser.Read(p[n:pLen])
n += n2
if err != nil {
break
}
}
}
return
}