mirror of
https://github.com/unidoc/unipdf.git
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45 lines
1015 B
Go
45 lines
1015 B
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package core
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import (
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"bufio"
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"errors"
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"os"
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"github.com/unidoc/unidoc/common"
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)
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func (this *PdfParser) ReadAtLeast(p []byte, n int) (int, error) {
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remaining := n
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start := 0
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numRounds := 0
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for remaining > 0 {
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nRead, err := this.reader.Read(p[start:])
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if err != nil {
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common.Log.Debug("ERROR Failed reading (%d;%d) %s", nRead, numRounds, err.Error())
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return start, errors.New("Failed reading")
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}
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numRounds++
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start += nRead
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remaining -= nRead
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}
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return start, nil
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}
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// Get the current file offset, accounting for buffered position.
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func (this *PdfParser) GetFileOffset() int64 {
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offset, _ := this.rs.Seek(0, os.SEEK_CUR)
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offset -= int64(this.reader.Buffered())
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return offset
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}
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// Seek the file to an offset position.
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func (this *PdfParser) SetFileOffset(offset int64) {
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this.rs.Seek(offset, os.SEEK_SET)
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this.reader = bufio.NewReader(this.rs)
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}
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