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- /****************************************************************************
- * binfmt/libnxflat/libnxflat_read.c
- *
- * Copyright (C) 2009, 2020 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 <sys/types.h>
- #include <stdint.h>
- #include <unistd.h>
- #include <string.h>
- #include <nxflat.h>
- #include <debug.h>
- #include <errno.h>
- #include <arpa/inet.h>
- #include <nuttx/fs/fs.h>
- #include <nuttx/binfmt/nxflat.h>
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #undef NXFLAT_DUMP_READDATA /* Define to dump all file data read */
- /****************************************************************************
- * Private Constant Data
- ****************************************************************************/
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxflat_dumpreaddata
- ****************************************************************************/
- #if defined(NXFLAT_DUMP_READDATA)
- static inline void nxflat_dumpreaddata(FAR char *buffer, int buflen)
- {
- FAR uint32_t *buf32 = (FAR uint32_t *)buffer;
- int i;
- int j;
- for (i = 0; i < buflen; i += 32)
- {
- syslog(LOG_DEBUG, "%04x:", i);
- for (j = 0; j < 32; j += sizeof(uint32_t))
- {
- syslog(LOG_DEBUG, " %08x", *buf32++);
- }
- syslog(LOG_DEBUG, "\n");
- }
- }
- #else
- # define nxflat_dumpreaddata(b,n)
- #endif
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxflat_read
- *
- * Description:
- * Read 'readsize' bytes from the object file at 'offset'
- *
- * Returned Value:
- * 0 (OK) is returned on success and a negated errno is returned on
- * failure.
- *
- ****************************************************************************/
- int nxflat_read(struct nxflat_loadinfo_s *loadinfo, char *buffer,
- int readsize, int offset)
- {
- ssize_t nbytes; /* Number of bytes read */
- off_t rpos; /* Position returned by lseek */
- char *bufptr; /* Next buffer location to read into */
- int bytesleft; /* Number of bytes of .data left to read */
- int bytesread; /* Total number of bytes read */
- binfo("Read %d bytes from offset %d\n", readsize, offset);
- /* Seek to the position in the object file where the initialized
- * data is saved.
- */
- bytesread = 0;
- bufptr = buffer;
- bytesleft = readsize;
- do
- {
- rpos = lseek(loadinfo->filfd, offset, SEEK_SET);
- if (rpos != offset)
- {
- int errval = get_errno();
- berr("Failed to seek to position %d: %d\n", offset, errval);
- return -errval;
- }
- /* Read the file data at offset into the user buffer */
- nbytes = nx_read(loadinfo->filfd, bufptr, bytesleft);
- if (nbytes < 0)
- {
- if (nbytes != -EINTR)
- {
- berr("Read from offset %d failed: %d\n",
- offset, (int)nbytes);
- return nbytes;
- }
- }
- else if (nbytes == 0)
- {
- berr("Unexpected end of file\n");
- return -ENODATA;
- }
- else
- {
- bytesread += nbytes;
- bytesleft -= nbytes;
- bufptr += nbytes;
- offset += nbytes;
- }
- }
- while (bytesread < readsize);
- nxflat_dumpreaddata(buffer, readsize);
- return OK;
- }
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