Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-11-04 08:51:36 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * apps/graphics/tiff/tiff_utils.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 <string.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_put/get16/32
+ *
+ * Description:
+ *   Put and get 16 and 32 values in the correct byte order at the specified
+ *   position.
+ *
+ * Input Parameters:
+ *   dest - The location to store the multi-byte data (put only)
+ *   src - The location to get the multi-byte data (get only)
+ *   value - The value to be stored (put only)
+ *
+ * Returned Value:
+ *   None (put)
+ *   The extracted value (get)
+ *
+ ****************************************************************************/
+
+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
+}
+
+uint16_t tiff_get16(FAR uint8_t *src)
+{
+#ifdef CONFIG_ENDIAN_BIG
+  return (uint16_t)src[0] << 8 | (uint16_t)src[1];
+#else
+  return (uint16_t)src[1] << 8 | (uint16_t)src[0];
+#endif
+}
+
+uint32_t tiff_get32(FAR uint8_t *src)
+{
+#ifdef CONFIG_ENDIAN_BIG
+  return (uint32_t)tiff_get16(src) << 16 | (uint32_t)tiff_get16(src+2);
+#else
+  return (uint32_t)tiff_get16(src+2) << 16 | (uint32_t)tiff_get16(src);
+#endif
+
+}
+
+/****************************************************************************
+ * Name: tiff_read
+ *
+ * Description:
+ *   Read TIFF data from the specified file
+ *
+ * Input Parameters:
+ *   fd - Open file descriptor to read from
+ *   buffer - Read-only buffer containing the data to be written
+ *   count - The number of bytes to write
+ *
+ * Returned Value:
+ *   On success, then number of bytes read; Zero is returned on EOF.
+ *   Otherwise, a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+ssize_t tiff_read(int fd, FAR void *buffer, size_t count)
+{
+  size_t  ntotal;
+  ssize_t nbytes;
+  int errval;
+
+  /* This loop retries the write until either: (1) it completes successfully,
+   * or (2) until an irrecoverble error occurs.
+   */
+
+  for (ntotal = 0; ntotal < count; )
+    {
+      /* Do the read.  The number of bytes left to read is the total
+       * requested size (count) minus the amount that we have alread read
+       * (ntotal).
+       */
+
+      nbytes = read(fd, buffer, count-ntotal);
+
+      /* 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;
+            }
+        }
+
+      /* Zero is a special case and means that the end of file was encountered. */
+
+      else if (nbytes == 0)
+        {
+          break;
+        }
+
+      /* What if read returns some number of bytes other than the requested number?
+       * This probably means that the end-of-file will be encountered the next time
+       * that we call read().
+       */
+
+      else
+        {
+          buffer += nbytes;
+          ntotal += nbytes;
+        }
+    }
+
+  return ntotal;
+}
+
+/****************************************************************************
+ * 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 const 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 write returns some number of bytes other than the requested number? */
+
+      else
+        {
+          DEBUGASSERT(nbytes == count);
+          buffer += nbytes;
+          count  -= nbytes;
+        }
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: tiff_putint16
+ *
+ * Description:
+ *   Write two bytes to the outfile.
+ *
+ * Input Parameters:
+ *   fd - File descriptor to be used.
+ *   value - The 2-byte, uint16_t value to write
+ *
+ * Returned Value:
+ *   Zero (OK) on success.  A negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int tiff_putint16(int fd, uint16_t value)
+{
+  uint8_t bytes[2];
+  
+  /* Write the two bytes to the output file */
+
+  tiff_put16(bytes, value);
+  return tiff_write(fd, bytes, 2);
+}
+
+/****************************************************************************
+ * Name: tiff_putint32
+ *
+ * Description:
+ *   Write four bytes to the outfile.
+ *
+ * Input Parameters:
+ *   fd - File descriptor to be used.
+ *   value - The 4-byte, uint32_t value to write
+ *
+ * Returned Value:
+ *   Zero (OK) on success.  A negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int tiff_putint32(int fd, uint32_t value)
+{
+  uint8_t bytes[4];
+  
+  /* Write the four bytes to the output file */
+
+  tiff_put32(bytes, value);
+  return tiff_write(fd, bytes, 4);
+}
+
+/****************************************************************************
+ * Name: tiff_putstring
+ *
+ * Description:
+ *  Write a string of fixed length to the outfile.
+ *
+ * Input Parameters:
+ *   fd - File descriptor to be used.
+ *   string - A pointer to the memory containing the string
+ *   len - The length of the string (including the NUL terminator)
+ *
+ * Returned Value:
+ *   Zero (OK) on success.  A negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int tiff_putstring(int fd, FAR const char *string, int len)
+{
+#ifdef CONFIG_DEBUG_GRAPHICS
+  int actual = strlen(string);
+
+  ASSERT(len = actual+1);
+#endif
+  return tiff_write(fd, string, len);
+}
+
+/****************************************************************************
+ * Name: tiff_wordalign
+ *
+ * Description:
+ *  Pad a file with zeros as necessary to achieve word alignament.
+ *
+ * Input Parameters:
+ *   fd - File descriptor to be used.
+ *   size - The current size of the file
+ *
+ * Returned Value:
+ *   The new size of the file on success.  A negated errno value on failure.
+ *
+ ****************************************************************************/
+
+ssize_t tiff_wordalign(int fd, size_t size)
+{
+  unsigned int remainder;
+  int ret;
+
+  remainder = size & 3;
+  if (remainder > 0)
+    {
+      unsigned int nbytes = 4 - remainder;
+      uint32_t value      = 0;
+
+      ret = tiff_write(fd, &value, nbytes);
+      if (ret < 0)
+        {
+          return (ssize_t)ret;
+        }
+      size += nbytes;  
+    }
+  return size;
+}