70 lines
1.1 KiB
Go
70 lines
1.1 KiB
Go
package xmlquery
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import (
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"bufio"
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)
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type cachedReader struct {
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buffer *bufio.Reader
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cache []byte
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cacheCap int
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cacheLen int
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caching bool
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}
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func newCachedReader(r *bufio.Reader) *cachedReader {
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return &cachedReader{
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buffer: r,
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cache: make([]byte, 4096),
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cacheCap: 4096,
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cacheLen: 0,
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caching: false,
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}
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}
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func (c *cachedReader) StartCaching() {
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c.cacheLen = 0
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c.caching = true
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}
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func (c *cachedReader) ReadByte() (byte, error) {
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if !c.caching {
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return c.buffer.ReadByte()
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}
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b, err := c.buffer.ReadByte()
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if err != nil {
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return b, err
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}
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if c.cacheLen < c.cacheCap {
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c.cache[c.cacheLen] = b
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c.cacheLen++
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}
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return b, err
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}
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func (c *cachedReader) Cache() []byte {
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return c.cache[:c.cacheLen]
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}
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func (c *cachedReader) StopCaching() {
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c.caching = false
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}
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func (c *cachedReader) Read(p []byte) (int, error) {
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n, err := c.buffer.Read(p)
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if err != nil {
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return n, err
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}
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if c.caching && c.cacheLen < c.cacheCap {
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for i := 0; i < n; i++ {
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c.cache[c.cacheLen] = p[i]
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c.cacheLen++
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if c.cacheLen >= c.cacheCap {
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break
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}
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}
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}
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return n, err
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}
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