154 lines
3.5 KiB
C
154 lines
3.5 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: LiteralStorage.C /main/1 1996/07/29 16:56:08 cde-hp $ */
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// Copyright (c) 1996 James Clark
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// See the file COPYING for copying permission.
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include "splib.h"
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#include "LiteralStorage.h"
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#include "CodingSystem.h"
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#include <string.h>
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#ifdef DECLARE_MEMMOVE
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extern "C" {
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void *memmove(void *, const void *, size_t);
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}
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#endif
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class LiteralStorageObject : public StorageObject {
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public:
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LiteralStorageObject(const StringC &);
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Boolean read(char *buf, size_t bufSize, Messenger &, size_t &nread);
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Boolean rewind(Messenger &);
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private:
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LiteralStorageObject(const LiteralStorageObject &); // undefined
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void operator=(const LiteralStorageObject &); // undefined
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StringC str_;
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size_t nBytesRead_;
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};
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class MemoryInputCodingSystem : public InputCodingSystem {
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public:
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Decoder *makeDecoder() const;
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};
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class MemoryDecoder : public Decoder {
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public:
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MemoryDecoder();
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size_t decode(Char *, const char *, size_t, const char **);
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};
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LiteralStorageManager::LiteralStorageManager(const char *type)
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: type_(type)
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{
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}
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StorageObject *LiteralStorageManager::makeStorageObject(const StringC &id,
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const StringC &,
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Boolean,
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Boolean,
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Messenger &,
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StringC &foundId)
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{
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foundId = id;
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return new LiteralStorageObject(id);
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}
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const InputCodingSystem *LiteralStorageManager::requiredCodingSystem() const
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{
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static MemoryInputCodingSystem cs;
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return &cs;
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}
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Boolean LiteralStorageManager::requiresCr() const
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{
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return 1;
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}
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const char *LiteralStorageManager::type() const
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{
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return type_;
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}
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Boolean LiteralStorageManager::inheritable() const
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{
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return 0;
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}
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LiteralStorageObject::LiteralStorageObject(const StringC &str)
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: str_(str), nBytesRead_(0)
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{
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}
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Boolean LiteralStorageObject::rewind(Messenger &)
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{
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nBytesRead_ = 0;
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return 1;
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}
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Boolean LiteralStorageObject::read(char *buf, size_t bufSize,
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Messenger &, size_t &nread)
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{
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if (nBytesRead_ >= str_.size()*sizeof(Char))
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return 0;
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nread = str_.size()*sizeof(Char) - nBytesRead_;
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if (nread > bufSize)
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nread = bufSize;
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memcpy(buf, (char *)str_.data() + nBytesRead_, nread);
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nBytesRead_ += nread;
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return 1;
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}
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Decoder *MemoryInputCodingSystem::makeDecoder() const
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{
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return new MemoryDecoder;
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}
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MemoryDecoder::MemoryDecoder()
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: Decoder(sizeof(Char))
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{
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}
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size_t MemoryDecoder::decode(Char *to, const char *from, size_t fromLen,
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const char **rest)
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{
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size_t nChars = fromLen/sizeof(Char);
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*rest = from + nChars*sizeof(Char);
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if (from != (char *)to)
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memmove(to, from, nChars*sizeof(Char));
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return nChars;
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}
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#ifdef SP_NAMESPACE
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}
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#endif
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