/****************************************************************************** * * Project: JPEG-2000 * Purpose: Return a stream for a VSIL file * Author: Even Rouault, even dot rouault at mines dash paris dot org * ******************************************************************************/ /* Following code is mostly derived from jas_stream.c, which is licensed */ /* under the below terms */ /* * Copyright (c) 1999-2000 Image Power, Inc. and the University of * British Columbia. * Copyright (c) 2001-2003 Michael David Adams. * All rights reserved. * Copyright (c) 2009-2010, Even Rouault */ /* __START_OF_JASPER_LICENSE__ * * JasPer License Version 2.0 * * Copyright (c) 2001-2006 Michael David Adams * Copyright (c) 1999-2000 Image Power, Inc. * Copyright (c) 1999-2000 The University of British Columbia * * All rights reserved. * * Permission is hereby granted, free of charge, to any person (the * "User") obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without restriction, * including without limitation the rights to use, copy, modify, merge, * publish, distribute, and/or sell copies of the Software, and to permit * persons to whom the Software is furnished to do so, subject to the * following conditions: * * 1. The above copyright notices and this permission notice (which * includes the disclaimer below) shall be included in all copies or * substantial portions of the Software. * * 2. The name of a copyright holder shall not be used to endorse or * promote products derived from the Software without specific prior * written permission. * * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY. * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES, * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH, * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. * * __END_OF_JASPER_LICENSE__ */ #ifndef __STDC_LIMIT_MACROS // Needed on RHEL 6 for SIZE_MAX availability, needed by Jasper #define __STDC_LIMIT_MACROS 1 #endif #include "jpeg2000_vsil_io.h" #include "cpl_vsi.h" CPL_CVSID("$Id: jpeg2000_vsil_io.cpp 7e07230bbff24eb333608de4dbd460b7312839d0 2017-12-11 19:08:47Z Even Rouault $") /* * File descriptor file object. */ typedef struct { VSILFILE* fp; } jas_stream_VSIFL_t; /******************************************************************************\ * File stream object. \******************************************************************************/ static int JPEG2000_VSIL_read(jas_stream_obj_t *obj, char *buf, int cnt) { jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj); return static_cast(VSIFReadL(buf, 1, cnt, fileobj->fp)); } static int JPEG2000_VSIL_write(jas_stream_obj_t *obj, char *buf, int cnt) { jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj); return static_cast(VSIFWriteL(buf, 1, cnt, fileobj->fp)); } static long JPEG2000_VSIL_seek(jas_stream_obj_t *obj, long offset, int origin) { jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj); if (offset < 0 && origin == SEEK_CUR) { origin = SEEK_SET; offset += VSIFTellL(fileobj->fp); } else if (offset < 0 && origin == SEEK_END) { origin = SEEK_SET; VSIFSeekL(fileobj->fp, 0, SEEK_END); offset += VSIFTellL(fileobj->fp); } VSIFSeekL(fileobj->fp, offset, origin); return VSIFTellL(fileobj->fp); } static int JPEG2000_VSIL_close(jas_stream_obj_t *obj) { jas_stream_VSIFL_t *fileobj = JAS_CAST(jas_stream_VSIFL_t *, obj); if( fileobj->fp != nullptr ) { VSIFCloseL(fileobj->fp); fileobj->fp = nullptr; } jas_free(fileobj); return 0; } static const jas_stream_ops_t JPEG2000_VSIL_stream_fileops = { JPEG2000_VSIL_read, JPEG2000_VSIL_write, JPEG2000_VSIL_seek, JPEG2000_VSIL_close }; /******************************************************************************\ * Code for opening and closing streams. \******************************************************************************/ static jas_stream_t *JPEG2000_VSIL_jas_stream_create() { jas_stream_t *stream; if (!(stream = (jas_stream_t*) jas_malloc(sizeof(jas_stream_t)))) { return nullptr; } stream->openmode_ = 0; stream->bufmode_ = 0; stream->flags_ = 0; stream->bufbase_ = nullptr; stream->bufstart_ = nullptr; stream->bufsize_ = 0; stream->ptr_ = nullptr; stream->cnt_ = 0; stream->ops_ = nullptr; stream->obj_ = nullptr; stream->rwcnt_ = 0; stream->rwlimit_ = -1; return stream; } static void JPEG2000_VSIL_jas_stream_destroy(jas_stream_t *stream) { /* If the memory for the buffer was allocated with malloc, free this memory. */ if ((stream->bufmode_ & JAS_STREAM_FREEBUF) && stream->bufbase_) { jas_free(stream->bufbase_); stream->bufbase_ = nullptr; } jas_free(stream); } /******************************************************************************\ * Buffer initialization code. \******************************************************************************/ static void JPEG2000_VSIL_jas_stream_initbuf(jas_stream_t *stream, int bufmode, char *buf, int bufsize) { /* If this function is being called, the buffer should not have been initialized yet. */ assert(!stream->bufbase_); if (bufmode != JAS_STREAM_UNBUF) { /* The full- or line-buffered mode is being employed. */ if (!buf) { /* The caller has not specified a buffer to employ, so allocate one. */ if ((stream->bufbase_ = (unsigned char*)jas_malloc(JAS_STREAM_BUFSIZE + JAS_STREAM_MAXPUTBACK))) { stream->bufmode_ |= JAS_STREAM_FREEBUF; stream->bufsize_ = JAS_STREAM_BUFSIZE; } else { /* The buffer allocation has failed. Resort to unbuffered operation. */ stream->bufbase_ = stream->tinybuf_; stream->bufsize_ = 1; } } else { /* The caller has specified a buffer to employ. */ /* The buffer must be large enough to accommodate maximum putback. */ assert(bufsize > JAS_STREAM_MAXPUTBACK); stream->bufbase_ = JAS_CAST(unsigned char *, buf); stream->bufsize_ = bufsize - JAS_STREAM_MAXPUTBACK; } } else { /* The unbuffered mode is being employed. */ /* A buffer should not have been supplied by the caller. */ assert(!buf); /* Use a trivial one-character buffer. */ stream->bufbase_ = stream->tinybuf_; stream->bufsize_ = 1; } stream->bufstart_ = &stream->bufbase_[JAS_STREAM_MAXPUTBACK]; stream->ptr_ = stream->bufstart_; stream->cnt_ = 0; stream->bufmode_ |= bufmode & JAS_STREAM_BUFMODEMASK; } static int JPEG2000_VSIL_jas_strtoopenmode(const char *s) { int openmode = 0; while (*s != '\0') { switch (*s) { case 'r': openmode |= JAS_STREAM_READ; break; case 'w': openmode |= JAS_STREAM_WRITE | JAS_STREAM_CREATE; break; case 'b': openmode |= JAS_STREAM_BINARY; break; case 'a': openmode |= JAS_STREAM_APPEND; break; case '+': openmode |= JAS_STREAM_READ | JAS_STREAM_WRITE; break; default: break; } ++s; } return openmode; } jas_stream_t *JPEG2000_VSIL_fopen(const char *filename, const char *mode) { jas_stream_t *stream; jas_stream_VSIFL_t *obj; /* Allocate a stream object. */ if (!(stream = JPEG2000_VSIL_jas_stream_create())) { return nullptr; } /* Parse the mode string. */ stream->openmode_ = JPEG2000_VSIL_jas_strtoopenmode(mode); /* Allocate space for the underlying file stream object. */ if (!(obj = (jas_stream_VSIFL_t*) jas_malloc(sizeof(jas_stream_VSIFL_t)))) { JPEG2000_VSIL_jas_stream_destroy(stream); return nullptr; } obj->fp = nullptr; stream->obj_ = (void *) obj; /* Select the operations for a file stream object. */ stream->ops_ = const_cast (&JPEG2000_VSIL_stream_fileops); /* Open the underlying file. */ if ((obj->fp = VSIFOpenL(filename, mode)) == nullptr) { jas_stream_close(stream); return nullptr; } /* By default, use full buffering for this type of stream. */ JPEG2000_VSIL_jas_stream_initbuf(stream, JAS_STREAM_FULLBUF, nullptr, 0); return stream; }