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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-09-20 19:19:33 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-09-20 19:19:33 +0000 |
commit | 0e69fff93f13982c5f90a88050bcbd8bd1e0b2d7 (patch) | |
tree | 909ec82dbe7f836a18e232e941a3644c4844f820 /apps/graphics/tiff/tiff_utils.c | |
parent | 63fa495324ba5f83daf562de6cf85f3cdfe93f35 (diff) | |
download | nuttx-0e69fff93f13982c5f90a88050bcbd8bd1e0b2d7.tar.gz nuttx-0e69fff93f13982c5f90a88050bcbd8bd1e0b2d7.tar.bz2 nuttx-0e69fff93f13982c5f90a88050bcbd8bd1e0b2d7.zip |
Add beginning of a TIFF file creation library
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3964 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'apps/graphics/tiff/tiff_utils.c')
-rw-r--r-- | apps/graphics/tiff/tiff_utils.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/apps/graphics/tiff/tiff_utils.c b/apps/graphics/tiff/tiff_utils.c new file mode 100644 index 000000000..13f9e6801 --- /dev/null +++ b/apps/graphics/tiff/tiff_utils.c @@ -0,0 +1,171 @@ +/**************************************************************************** + * apps/graphics/tiff/tiff_utils.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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/tiff.h> + +#include "tiff_internal.h" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: tiff_put16 and tiff_put32 + * + * Description: + * Put 16 and 32 values in the correct byte order at the specified position. + * + * Input Parameters: + * dest - The location to store the multi-byte data + * value - The value to be stored + * + * Returned Value: + * None + * + ****************************************************************************/ + +void tiff_put16(FAR uint8_t *dest, uint16_t value) +{ +#ifdef CONFIG_ENDIAN_BIG + *dest++ = (uint8_t)(value >> 8); + *dest = (uint8_t)(value & 0xff); +#else + *dest++ = (uint8_t)(value & 0xff); + *dest = (uint8_t)(value >> 8); +#endif +} + +void tiff_put32(FAR uint8_t *dest, uint32_t value) +{ +#ifdef CONFIG_ENDIAN_BIG + tiff_put16(dest, (uint16_t)(value >> 16)); + tiff_put16(dest+2, (uint16_t)(value & 0xffff)); +#else + tiff_put16(dest, (uint16_t)(value & 0xffff)); + tiff_put16(dest+2, (uint16_t)(value >> 16)); +#endif +} + +/**************************************************************************** + * Name: tiff_write + * + * Description: + * Write TIFF data to the specified file + * + * Input Parameters: + * fd - Open file descriptor to write to + * buffer - Read-only buffer containing the data to be written + * count - The number of bytes to write + * + * Returned Value: + * Zero (OK) on success. A negated errno value on failure. + * + ****************************************************************************/ + +int tiff_write(int fd, FAR void *buffer, size_t count) +{ + ssize_t nbytes; + int errval; + + /* This loop retries the write until either: (1) it completes successfully, + * or (2) until an irrecoverble error occurs. + */ + + while (count > 0) + { + /* Do the write */ + + nbytes = write(fd, buffer, count); + + /* Check for an error */ + + if (nbytes < 0) + { + /* EINTR is not an error.. this just means that the write was + * interrupted by a signal. + */ + + errval = errno; + if (errval != EINTR) + { + /* Other errors are bad news and we will break out with an error */ + + return -errval; + } + } + + /* What if the the write returns some number of bytes other than the requested number? */ + + else + { + DEBUGASSERT(nbytes < count && nbytes != 0); + count -= nbytes; + } + } + + return OK; +} + |