mirror of https://github.com/qpdf/qpdf.git
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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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 <qpdf/PointerHolder.hh>
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#include <stdio.h>
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#include <string>
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class QPDF_DLL_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 QPDF_DLL_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 is found, these
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// methods return true and leave the input source positioned
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// wherever 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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// Note: you can only unread the character you just read. The
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// specific character is ignored by some implementations, and the
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// implementation doesn't check this. Use of unreadCh is
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// semantically equivalent to seek(-1, SEEK_CUR) but is much more
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// efficient.
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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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private:
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class Members
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{
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friend class InputSource;
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public:
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QPDF_DLL
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~Members();
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private:
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Members();
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Members(Members const&);
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};
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PointerHolder<Members> m;
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};
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#endif // QPDF_INPUTSOURCE_HH
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