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174 lines
4.4 KiB
174 lines
4.4 KiB
/*
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* $Id: blob.c,v 1.1 2009/02/22 08:09:00 nicholas Exp $
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*
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* pi-blob.h - Support for blobs that appear in some palm databases.
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*
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* (c) 2008, Jon Schewe & Judd Montgomery
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include "pi-macros.h"
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#include "pi-blob.h"
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/***********************************************************************
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*
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* Function: free_Blob
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*
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* Summary: Frees members of the blob structure
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*
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* Parameters: Blob_t*
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*
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* Returns: void
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*
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***********************************************************************/
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void
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free_Blob(Blob_t *blob)
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{
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if(NULL != blob->data) {
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free(blob->data);
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blob->data = NULL;
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}
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}
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/***********************************************************************
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*
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* Function: dup_Blob
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*
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* Summary: Allocate memory for a new blob that is a duplicate of this one and copy the data into it
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*
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* Parameters: Blob_t*
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*
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* Returns: Blob_t* or NULL if there isn't enough memory and errno is set to ENOMEM
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*
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***********************************************************************/
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Blob_t*
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dup_Blob(const Blob_t *blob)
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{
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if(NULL == blob) {
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return NULL;
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}
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Blob_t *retval = (Blob_t*)malloc(sizeof(Blob_t));
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if(NULL == retval) {
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errno = ENOMEM;
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return NULL;
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}
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memcpy(retval->type, blob->type, 4);
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retval->length = blob->length;
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if(blob->length > 0) {
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retval->data = (uint8_t *)malloc(blob->length);
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if(NULL == retval->data) {
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errno = ENOMEM;
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return NULL;
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} else {
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memcpy(retval->data, blob->data, blob->length);
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}
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} else {
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retval->data = NULL;
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}
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return retval;
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}
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/***********************************************************************
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*
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* Function: unpack_Blob
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*
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* Summary: Unpack a blob starting at position in data
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*
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* Parameters: Blob_t*, unsigned char*, size_t
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*
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* Returns: the number of bytes read or -1 on error
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*
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***********************************************************************/
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int
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unpack_Blob_p(Blob_t *blob, const unsigned char *data, const size_t position) {
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size_t localPosition = position;
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memcpy(blob->type, (char *)data+localPosition, 4);
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localPosition += 4;
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//printf("blob->type = %c %c %c %c\n", blob->type[0], blob->type[1], blob->type[2], blob->type[3]);
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blob->length = get_short(data+localPosition);
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localPosition += 2;
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if(blob->length > 0) {
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//printf("blob->length = %d\n", blob->length);
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blob->data = (uint8_t *)malloc(blob->length);
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if(NULL == blob->data) {
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printf("Malloc failed!\n");
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return -1;
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} else {
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memcpy(blob->data, data+localPosition, blob->length);
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}
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localPosition += blob->length;
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}
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return localPosition - position;
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}
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/***********************************************************************
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*
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* Function: pack_Blob
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*
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* Summary: Pack a blob into the specified buffer
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*
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* Parameters: Blob_t*, pi_buffer_t*
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*
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* Returns: 0 on success, -1 on failure
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*
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***********************************************************************/
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int
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pack_Blob(const Blob_t *blob, pi_buffer_t *buf) {
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size_t offset;
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offset = buf->used;
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pi_buffer_expect(buf, buf->used + 6 + blob->length);
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buf->used = buf->used + 6 + blob->length;
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memcpy(buf->data+offset, blob->type, 4);
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offset += 4;
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set_short(buf->data+offset, blob->length);
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offset += 2;
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memcpy(buf->data+offset, blob->data, blob->length);
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offset += blob->length;
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return 0;
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}
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/* vi: set ts=8 sw=4 sts=4 noexpandtab: cin */
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/* ex: set tabstop=4 expandtab: */
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/* Local Variables: */
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/* indent-tabs-mode: t */
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/* c-basic-offset: 8 */
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/* End: */
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