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296b679d6e
Preparing to refactor some pattern searching code to use these instead of their own memchr loops. This should simplify the code that replaces PCRE.
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/* Copyright (c) 2005-2015 Jay Berkenbilt
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*
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* This file is part of qpdf. This software may be distributed under
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* the terms of version 2 of the Artistic License which may be found
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* in the source distribution. It is provided "as is" without express
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* or implied warranty.
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*/
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#ifndef __QPDF_INPUTSOURCE_HH__
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#define __QPDF_INPUTSOURCE_HH__
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#include <qpdf/DLL.h>
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#include <qpdf/Types.h>
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#include <stdio.h>
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#include <string>
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class InputSource
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{
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public:
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QPDF_DLL
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InputSource() :
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last_offset(0)
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{
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}
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QPDF_DLL
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virtual ~InputSource()
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{
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}
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class Finder
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{
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public:
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Finder()
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{
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}
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virtual ~Finder()
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{
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}
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virtual bool check() = 0;
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};
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QPDF_DLL
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void setLastOffset(qpdf_offset_t);
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QPDF_DLL
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qpdf_offset_t getLastOffset() const;
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QPDF_DLL
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std::string readLine(size_t max_line_length);
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// Find first or last occurrence of a sequence of characters
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// starting within the range defined by offset and len such that,
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// when the input source is positioned at the beginning of that
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// sequence, finder.check() returns true. If len is 0, the search
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// proceeds until EOF. If a qualifying pattern these methods
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// return true and leave the input source positioned wherever
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// check() left it at the end of the matching pattern.
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QPDF_DLL
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bool findFirst(char const* start_chars,
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qpdf_offset_t offset, size_t len,
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Finder& finder);
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QPDF_DLL
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bool findLast(char const* start_chars,
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qpdf_offset_t offset, size_t len,
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Finder& finder);
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virtual qpdf_offset_t findAndSkipNextEOL() = 0;
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virtual std::string const& getName() const = 0;
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virtual qpdf_offset_t tell() = 0;
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virtual void seek(qpdf_offset_t offset, int whence) = 0;
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virtual void rewind() = 0;
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virtual size_t read(char* buffer, size_t length) = 0;
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virtual void unreadCh(char ch) = 0;
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protected:
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qpdf_offset_t last_offset;
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};
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#endif // __QPDF_INPUTSOURCE_HH__
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