427 lines
12 KiB
C++
427 lines
12 KiB
C++
/* $Id: tif_stream.cxx,v 1.11 2010-12-11 23:12:29 faxguy Exp $ */
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/*
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* Copyright (c) 1988-1996 Sam Leffler
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* Copyright (c) 1991-1996 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library UNIX-specific Routines.
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*/
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#include "tiffiop.h"
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#include "tiffio.hxx"
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#include <iostream>
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#ifndef __VMS
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using namespace std;
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#endif
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/*
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ISO C++ uses a 'std::streamsize' type to define counts. This makes
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it similar to, (but perhaps not the same as) size_t.
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The std::ios::pos_type is used to represent stream positions as used
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by tellg(), tellp(), seekg(), and seekp(). This makes it similar to
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(but perhaps not the same as) 'off_t'. The std::ios::streampos type
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is used for character streams, but is documented to not be an
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integral type anymore, so it should *not* be assigned to an integral
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type.
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The std::ios::off_type is used to specify relative offsets needed by
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the variants of seekg() and seekp() which accept a relative offset
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argument.
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Useful prototype knowledge:
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Obtain read position
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ios::pos_type basic_istream::tellg()
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Set read position
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basic_istream& basic_istream::seekg(ios::pos_type)
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basic_istream& basic_istream::seekg(ios::off_type, ios_base::seekdir)
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Read data
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basic_istream& istream::read(char *str, streamsize count)
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Number of characters read in last unformatted read
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streamsize istream::gcount();
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Obtain write position
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ios::pos_type basic_ostream::tellp()
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Set write position
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basic_ostream& basic_ostream::seekp(ios::pos_type)
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basic_ostream& basic_ostream::seekp(ios::off_type, ios_base::seekdir)
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Write data
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basic_ostream& ostream::write(const char *str, streamsize count)
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*/
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struct tiffis_data;
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struct tiffos_data;
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extern "C" {
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static tmsize_t _tiffosReadProc(thandle_t, void*, tmsize_t);
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static tmsize_t _tiffisReadProc(thandle_t fd, void* buf, tmsize_t size);
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static tmsize_t _tiffosWriteProc(thandle_t fd, void* buf, tmsize_t size);
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static tmsize_t _tiffisWriteProc(thandle_t, void*, tmsize_t);
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static uint64 _tiffosSeekProc(thandle_t fd, uint64 off, int whence);
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static uint64 _tiffisSeekProc(thandle_t fd, uint64 off, int whence);
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static uint64 _tiffosSizeProc(thandle_t fd);
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static uint64 _tiffisSizeProc(thandle_t fd);
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static int _tiffosCloseProc(thandle_t fd);
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static int _tiffisCloseProc(thandle_t fd);
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static int _tiffDummyMapProc(thandle_t , void** base, toff_t* size );
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static void _tiffDummyUnmapProc(thandle_t , void* base, toff_t size );
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static TIFF* _tiffStreamOpen(const char* name, const char* mode, void *fd);
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struct tiffis_data
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{
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istream *stream;
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ios::pos_type start_pos;
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};
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struct tiffos_data
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{
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ostream *stream;
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ios::pos_type start_pos;
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};
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static tmsize_t
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_tiffosReadProc(thandle_t, void*, tmsize_t)
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{
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return 0;
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}
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static tmsize_t
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_tiffisReadProc(thandle_t fd, void* buf, tmsize_t size)
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{
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tiffis_data *data = reinterpret_cast<tiffis_data *>(fd);
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// Verify that type does not overflow.
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streamsize request_size = size;
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if (static_cast<tmsize_t>(request_size) != size)
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return static_cast<tmsize_t>(-1);
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data->stream->read((char *) buf, request_size);
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return static_cast<tmsize_t>(data->stream->gcount());
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}
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static tmsize_t
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_tiffosWriteProc(thandle_t fd, void* buf, tmsize_t size)
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{
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tiffos_data *data = reinterpret_cast<tiffos_data *>(fd);
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ostream *os = data->stream;
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ios::pos_type pos = os->tellp();
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// Verify that type does not overflow.
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streamsize request_size = size;
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if (static_cast<tmsize_t>(request_size) != size)
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return static_cast<tmsize_t>(-1);
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os->write(reinterpret_cast<const char *>(buf), request_size);
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return static_cast<tmsize_t>(os->tellp() - pos);
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}
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static tmsize_t
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_tiffisWriteProc(thandle_t, void*, tmsize_t)
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{
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return 0;
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}
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static uint64
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_tiffosSeekProc(thandle_t fd, uint64 off, int whence)
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{
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tiffos_data *data = reinterpret_cast<tiffos_data *>(fd);
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ostream *os = data->stream;
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// if the stream has already failed, don't do anything
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if( os->fail() )
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return static_cast<uint64>(-1);
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switch(whence) {
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case SEEK_SET:
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{
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// Compute 64-bit offset
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uint64 new_offset = static_cast<uint64>(data->start_pos) + off;
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(new_offset);
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if (static_cast<uint64>(offset) != new_offset)
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return static_cast<uint64>(-1);
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os->seekp(offset, ios::beg);
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break;
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}
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case SEEK_CUR:
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{
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(off);
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if (static_cast<uint64>(offset) != off)
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return static_cast<uint64>(-1);
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os->seekp(offset, ios::cur);
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break;
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}
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case SEEK_END:
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{
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(off);
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if (static_cast<uint64>(offset) != off)
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return static_cast<uint64>(-1);
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os->seekp(offset, ios::end);
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break;
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}
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}
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// Attempt to workaround problems with seeking past the end of the
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// stream. ofstream doesn't have a problem with this but
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// ostrstream/ostringstream does. In that situation, add intermediate
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// '\0' characters.
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if( os->fail() ) {
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#ifdef __VMS
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int old_state;
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#else
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ios::iostate old_state;
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#endif
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ios::pos_type origin;
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old_state = os->rdstate();
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// reset the fail bit or else tellp() won't work below
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os->clear(os->rdstate() & ~ios::failbit);
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switch( whence ) {
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case SEEK_SET:
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default:
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origin = data->start_pos;
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break;
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case SEEK_CUR:
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origin = os->tellp();
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break;
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case SEEK_END:
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os->seekp(0, ios::end);
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origin = os->tellp();
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break;
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}
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// restore original stream state
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os->clear(old_state);
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// only do something if desired seek position is valid
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if( (static_cast<uint64>(origin) + off) > static_cast<uint64>(data->start_pos) ) {
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uint64 num_fill;
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// clear the fail bit
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os->clear(os->rdstate() & ~ios::failbit);
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// extend the stream to the expected size
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os->seekp(0, ios::end);
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num_fill = (static_cast<uint64>(origin)) + off - os->tellp();
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for( uint64 i = 0; i < num_fill; i++ )
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os->put('\0');
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// retry the seek
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os->seekp(static_cast<ios::off_type>(static_cast<uint64>(origin) + off), ios::beg);
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}
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}
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return static_cast<uint64>(os->tellp());
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}
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static uint64
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_tiffisSeekProc(thandle_t fd, uint64 off, int whence)
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{
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tiffis_data *data = reinterpret_cast<tiffis_data *>(fd);
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switch(whence) {
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case SEEK_SET:
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{
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// Compute 64-bit offset
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uint64 new_offset = static_cast<uint64>(data->start_pos) + off;
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(new_offset);
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if (static_cast<uint64>(offset) != new_offset)
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return static_cast<uint64>(-1);
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data->stream->seekg(offset, ios::beg);
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break;
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}
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case SEEK_CUR:
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{
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(off);
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if (static_cast<uint64>(offset) != off)
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return static_cast<uint64>(-1);
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data->stream->seekg(offset, ios::cur);
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break;
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}
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case SEEK_END:
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{
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// Verify that value does not overflow
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ios::off_type offset = static_cast<ios::off_type>(off);
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if (static_cast<uint64>(offset) != off)
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return static_cast<uint64>(-1);
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data->stream->seekg(offset, ios::end);
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break;
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}
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}
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return (uint64) (data->stream->tellg() - data->start_pos);
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}
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static uint64
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_tiffosSizeProc(thandle_t fd)
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{
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tiffos_data *data = reinterpret_cast<tiffos_data *>(fd);
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ostream *os = data->stream;
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ios::pos_type pos = os->tellp();
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ios::pos_type len;
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os->seekp(0, ios::end);
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len = os->tellp();
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os->seekp(pos);
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return (uint64) len;
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}
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static uint64
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_tiffisSizeProc(thandle_t fd)
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{
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tiffis_data *data = reinterpret_cast<tiffis_data *>(fd);
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ios::pos_type pos = data->stream->tellg();
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ios::pos_type len;
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data->stream->seekg(0, ios::end);
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len = data->stream->tellg();
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data->stream->seekg(pos);
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return (uint64) len;
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}
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static int
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_tiffosCloseProc(thandle_t fd)
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{
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// Our stream was not allocated by us, so it shouldn't be closed by us.
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delete reinterpret_cast<tiffos_data *>(fd);
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return 0;
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}
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static int
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_tiffisCloseProc(thandle_t fd)
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{
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// Our stream was not allocated by us, so it shouldn't be closed by us.
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delete reinterpret_cast<tiffis_data *>(fd);
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return 0;
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}
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static int
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_tiffDummyMapProc(thandle_t , void** base, toff_t* size )
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{
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return (0);
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}
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static void
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_tiffDummyUnmapProc(thandle_t , void* base, toff_t size )
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{
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}
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/*
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* Open a TIFF file descriptor for read/writing.
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*/
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static TIFF*
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_tiffStreamOpen(const char* name, const char* mode, void *fd)
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{
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TIFF* tif;
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if( strchr(mode, 'w') ) {
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tiffos_data *data = new tiffos_data;
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data->stream = reinterpret_cast<ostream *>(fd);
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data->start_pos = data->stream->tellp();
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// Open for writing.
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tif = TIFFClientOpen(name, mode,
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reinterpret_cast<thandle_t>(data),
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_tiffosReadProc,
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_tiffosWriteProc,
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_tiffosSeekProc,
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_tiffosCloseProc,
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_tiffosSizeProc,
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_tiffDummyMapProc,
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_tiffDummyUnmapProc);
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} else {
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tiffis_data *data = new tiffis_data;
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data->stream = reinterpret_cast<istream *>(fd);
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data->start_pos = data->stream->tellg();
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// Open for reading.
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tif = TIFFClientOpen(name, mode,
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reinterpret_cast<thandle_t>(data),
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_tiffisReadProc,
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_tiffisWriteProc,
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_tiffisSeekProc,
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_tiffisCloseProc,
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_tiffisSizeProc,
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_tiffDummyMapProc,
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_tiffDummyUnmapProc);
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}
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return (tif);
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}
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} /* extern "C" */
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TIFF*
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TIFFStreamOpen(const char* name, ostream *os)
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{
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// If os is either a ostrstream or ostringstream, and has no data
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// written to it yet, then tellp() will return -1 which will break us.
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// We workaround this by writing out a dummy character and
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// then seek back to the beginning.
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if( !os->fail() && static_cast<int>(os->tellp()) < 0 ) {
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*os << '\0';
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os->seekp(0);
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}
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// NB: We don't support mapped files with streams so add 'm'
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return _tiffStreamOpen(name, "wm", os);
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}
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TIFF*
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TIFFStreamOpen(const char* name, istream *is)
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{
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// NB: We don't support mapped files with streams so add 'm'
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return _tiffStreamOpen(name, "rm", is);
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}
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/* vim: set ts=8 sts=8 sw=8 noet: */
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/*
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Local Variables:
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mode: c
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indent-tabs-mode: true
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c-basic-offset: 8
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End:
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*/
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