/**********************************************************************
* pfwstring.c
* Write string table data a POFF file
*
* Copyright (C) 2008-2009 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "keywords.h" /* Standard types */
#include "pedefs.h" /* error code definitions */
#include "perr.h" /* error() */
#include "pofflib.h" /* POFF library interface */
#include "pfprivate.h" /* POFF private definitions */
/**********************************************************************
* Pre-processor Definitions
**********************************************************************/
/**********************************************************************
* Global Variables
**********************************************************************/
/**********************************************************************
* Private Variables
**********************************************************************/
/***********************************************************************
* Private Function Prototypes
***********************************************************************/
/***********************************************************************
* Private Functions
***********************************************************************/
/***********************************************************************
* Public Functions
***********************************************************************/
/***********************************************************************/
/* Search the string table for an occurrence of the indicates string.
* If found, return the offset in the string table to the string; if
* not found, return -1.
*/
int32_t poffFindString(poffHandle_t handle, const char *string)
{
poffInfo_t *poffInfo = (poffInfo_t*)handle;
char *sptr = poffInfo->stringTable;
uint32_t offset;
/* Has the string table been allocated yet? */
if (!poffInfo->stringTable) return -1;
/* Handle the NULL string case. Offset zero is reserved for the NULL
* string and for the zero-size string.
*/
if (!string) return 0;
/* Okay, we will have to search the table */
for (offset = 0;
offset < poffInfo->stringTableSection.sh_size;
offset += (strlen(sptr) + 1))
{
/* Get a pointer at this offset into the string table */
sptr = &poffInfo->stringTable[offset];
/* Check if the strings match. If so, return the offset */
if (strcmp(sptr, string) == 0) return offset;
}
/* The string does not exist in the string table */
return -1;
}
/***********************************************************************/
/***********************************************************************/
/* Add a string to the string table and return the offset to the
* string storage location in the string table section data.
*/
uint32_t poffAddString(poffHandle_t handle, const char *string)
{
poffInfo_t *poffInfo = (poffInfo_t*)handle;
int32_t index;
int len;
/* Check if we have allocated a string table buffer yet */
if (!poffInfo->stringTable)
{
/* No, allocate it now */
poffInfo->stringTable = (char*)malloc(INITIAL_STRING_TABLE_SIZE);
if (!poffInfo->stringTable)
{
fatal(eNOMEMORY);
}
/* Index 0 is reserved for the NULL string */
poffInfo->stringTable[0] = '\0';
poffInfo->stringTableSection.sh_size = 1;
poffInfo->stringTableAlloc = INITIAL_STRING_TABLE_SIZE;
}
/* Check if the string is already defined in the string table.
* This is very time consuming, but guaratees that we do not keep
* duplicate strings in the string table.
*/
index = poffFindString(handle, string);
if (index < 0)
{
/* The string was not found in the string table. Check for the
* NULL string. In this case, return index == 0. NOTE: This
* check is pointless. If this is any kind of NULL string, then
* poffFindString will have returned index == 0.
*/
if ((string == NULL) || ((len = strlen(string)) <= 0))
{
index = 0;
}
else
{
/* Increment the length to include the null terminator */
len++;
/* Check if there is room for the new string */
if (poffInfo->stringTableSection.sh_size + len >
poffInfo->stringTableAlloc)
{
uint32_t newAlloc =
poffInfo->stringTableAlloc + STRING_TABLE_INCREMENT;
void *tmp;
/* Make sure that the new string will fit in the new allocation
* size (shouldn't happen)
*/
while (poffInfo->stringTableSection.sh_size + len > newAlloc)
newAlloc += STRING_TABLE_INCREMENT;
/* Reallocate the string buffer */
tmp = realloc(poffInfo->stringTable, newAlloc);
if (!tmp)
{
fatal(eNOMEMORY);
}
/* And set the new size */
poffInfo->stringTableAlloc = newAlloc;
poffInfo->stringTable = (char*)tmp;
}
/* Copy the string into the string table */
index = poffInfo->stringTableSection.sh_size;
memcpy(&poffInfo->stringTable[index], string, len);
/* Set the new size of the string table */
poffInfo->stringTableSection.sh_size += len;
}
}
return index;
}
/***********************************************************************/
