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

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;
+}
+