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nuttx-apps/graphics/tiff/tiff_finalize.c

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/****************************************************************************
* apps/graphics/tiff/tiff_finalize.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <apps/graphics/tiff.h>
#include "tiff_internal.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tiff_readifdentry
*
* Description:
* Read the IFD entry at the specified offset.
*
* Input Parameters:
* fd - File descriptor to rad from
* offset - Offset to read from
* ifdentry - Location to read the data
*
* Returned Value:
* Zero (OK) on success. A negated errno value on failure.
*
****************************************************************************/
static int tiff_readifdentry(int fd, off_t offset,
FAR struct tiff_ifdentry_s *ifdentry)
{
off_t newoffs;
ssize_t nbytes;
/* Seek to the read position */
newoffs = lseek(fd, offset, SEEK_SET);
if (newoffs == (off_t)-1)
{
return -errno;
}
/* Then read the IFD entry. Anything returned by tiff_read other than the
* size of the IFD entry would be an error.
*/
nbytes = tiff_read(fd, ifdentry, SIZEOF_IFD_ENTRY);
return nbytes == SIZEOF_IFD_ENTRY ? OK : -ENOSPC;
}
/****************************************************************************
* Name: tiff_writeifdentry
*
* Description:
* Write the IFD entry at the specified offset.
*
* Input Parameters:
* fd - File descriptor to rad from
* offset - Offset to read from
* ifdentry - Location to read the data
*
* Returned Value:
* Zero (OK) on success. A negated errno value on failure.
*
****************************************************************************/
static int tiff_writeifdentry(int fd, off_t offset,
FAR struct tiff_ifdentry_s *ifdentry)
{
off_t newoffs;
/* Seek to the write position */
newoffs = lseek(fd, offset, SEEK_SET);
if (newoffs == (off_t)-1)
{
return -errno;
}
/* Then write the IFD entry */
return tiff_write(fd, ifdentry, SIZEOF_IFD_ENTRY);
}
/****************************************************************************
* Name: tiff_cleanup
*
* Description:
* Normal clean-up after completion of the TIFF file creation
*
* Input Parameters:
* info - A pointer to the caller allocated parameter passing/TIFF
* state instance.
*
* Returned Value:
* None
*
****************************************************************************/
static void tiff_cleanup(FAR struct tiff_info_s *info)
{
/* Close all opened files */
if (info->outfd >= 0)
{
(void)close(info->outfd);
}
info->outfd = -1;
if (info->tmp1fd >= 0)
{
(void)close(info->tmp1fd);
}
info->tmp1fd = -1;
if (info->tmp2fd >= 0)
{
(void)close(info->tmp2fd);
}
info->tmp2fd = -1;
/* And remove the temporary files */
(void)unlink(info->tmpfile1);
(void)unlink(info->tmpfile2);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tiff_finalize
*
* Description:
* Finalize the TIFF output file, completing the TIFF file creation steps.
*
* Input Parameters:
* info - A pointer to the caller allocated parameter passing/TIFF state
* instance.
*
* Returned Value:
* Zero (OK) on success. A negated errno value on failure.
*
****************************************************************************/
int tiff_finalize(FAR struct tiff_info_s *info)
{
struct tiff_ifdentry_s ifdentry;
FAR uint8_t *ptr;
size_t maxoffsets;
#ifdef CONFIG_DEBUG_GRAPHICS
size_t total;
#endif
off_t offset;
int ret;
int i;
int j;
/* Put all of the pieces together to create the final output file. There
* are three pieces:
*
* 1) outfile: The partial output file containing the header, IFD and strip
* counts. This includes the StripOffsets and StripByteCounts that need
* to be updated. Size=outsize;
* 2) tmpfile1: This contains the offsets into tmpfile3 for each strip. The
* size of this file is tmp1size. These offsets are relative to the
* beginning of tmpfile3 and need to be offset by outsize+tmp1size.
* 3) tmpfile3: The strip data. Size is tmp2size. This is raw image data;
* no fixups are required.
*/
DEBUGASSERT(info && info->outfd >= 0 && info->tmp1fd >= 0 && info->tmp2fd >= 0);
DEBUGASSERT((info->outsize & 3) == 0 && (info->tmp1size & 3) == 0);
/* Fix-up the count value in the StripByteCounts IFD entry in the outfile.
* The actual number of strips was unknown at the time that the IFD entry
* was written.
*/
ret = tiff_readifdentry(info->outfd, info->filefmt->sbcifdoffset, &ifdentry);
if (ret < 0)
{
goto errout;
}
tiff_put32(ifdentry.count, info->nstrips);
ret = tiff_writeifdentry(info->outfd, info->filefmt->sbcifdoffset, &ifdentry);
if (ret < 0)
{
goto errout;
}
/* Fix-up the count and offset values in the StripOffsets IFD entry in the
* outfile. The StripOffsets data will be stored immediately after the
* outfile, hence, the correct offset is outsize.
*/
ret = tiff_readifdentry(info->outfd, info->filefmt->soifdoffset, &ifdentry);
if (ret < 0)
{
goto errout;
}
tiff_put32(ifdentry.count, info->nstrips);
tiff_put32(ifdentry.offset, info->outsize);
ret = tiff_writeifdentry(info->outfd, info->filefmt->soifdoffset, &ifdentry);
if (ret < 0)
{
goto errout;
}
/* Rewind to the beginning of tmpfile1 */
offset = lseek(info->tmp1fd, 0, SEEK_SET);
if (offset == (off_t)-1)
{
ret = -errno;
goto errout;
}
/* Seek to the end of the outfile */
ret = lseek(info->outfd, 0, SEEK_END);
if (offset == (off_t)-1)
{
ret = -errno;
goto errout;
}
/* Now read strip offset data from tmpfile1, update the offsets, and write
* the updated offsets to the outfile. The strip data will begin at offset
* outsize + tmp1size;
*/
maxoffsets = info->iosize >> 2;
#ifdef CONFIG_DEBUG_GRAPHICS
total = 0;
#endif
for (i = 0; i < info->nstrips; )
{
size_t noffsets;
ssize_t nbytes;
/* Read a group of up to 32-bit values */
noffsets = info->nstrips - i;
if (noffsets > maxoffsets)
{
noffsets = maxoffsets;
}
nbytes = tiff_read(info->tmp1fd, info->iobuffer, noffsets << 2);
/* If an error occurs or we fail to read exactly this number of
* bytes, then something bad happened.
*/
if (nbytes != noffsets << 2)
{
goto errout;
}
/* Fix up the offsets */
for (j = 0, ptr = info->iobuffer;
j < noffsets;
j++, ptr += 4)
{
uint32_t stripoff = tiff_get32(ptr);
stripoff += (info->outsize + info->tmp1size);
tiff_put32(ptr, stripoff);
}
/* Then write the corrected offsets to the outfile */
ret = tiff_write(info->outfd, info->iobuffer, nbytes);
if (ret < 0)
{
goto errout;
}
/* Update the count of offsets written */
i += noffsets;
#ifdef CONFIG_DEBUG_GRAPHICS
total += nbytes;
#endif
}
#ifdef CONFIG_DEBUG_GRAPHICS
ASSERT(total == info->tmp1size);
#endif
/* Rewind to the beginning of tmpfile2 */
offset = lseek(info->tmp2fd, 0, SEEK_SET);
if (offset == (off_t)-1)
{
ret = -errno;
goto errout;
}
/* Finally, copy the tmpfile2 to the end of the outfile */
#ifdef CONFIG_DEBUG_GRAPHICS
total = 0;
#endif
for (;;)
{
ssize_t nbytes;
/* Read a block of data from tmpfile2 */
nbytes = tiff_read(info->tmp2fd, info->iobuffer, info->iosize);
/* Check for tead errors and for end-of-file */
if (nbytes < 0)
{
ret = (int)nbytes;
goto errout;
}
else if (nbytes == 0)
{
break;
}
/* Then copy the data to the outfile */
ret = tiff_write(info->outfd, info->iobuffer, nbytes);
if (ret < 0)
{
goto errout;
}
#ifdef CONFIG_DEBUG_GRAPHICS
total += nbytes;
#endif
}
#ifdef CONFIG_DEBUG_GRAPHICS
ASSERT(total == info->tmp2size);
#endif
/* Close all files and return success */
tiff_cleanup(info);
return OK;
errout:
tiff_abort(info);
return ret;
}
/************************************************************************************
* Name: tiff_abort
*
* Description:
* Abort the TIFF file creation and create-up resources.
*
* Input Parameters:
* info - A pointer to the caller allocated parameter passing/TIFF state instance.
*
* Returned Value:
* None
*
************************************************************************************/
void tiff_abort(FAR struct tiff_info_s *info)
{
/* Perform normal cleanup */
tiff_cleanup(info);
/* But then delete the output file as well */
(void)unlink(info->outfile);
}
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