bdberl/c_src/bin_helper.c
2009-06-23 15:27:37 -05:00

76 lines
2.5 KiB
C

/* -------------------------------------------------------------------
*
* bin_helper: ErlDrvBinary helper functions
* Copyright (c) 2008-9 The Hive http://www.thehive.com/
* Authors: Dave "dizzyd" Smith <dizzyd@dizzyd.com>
* Phil Toland <phil.toland@gmail.com>
* Jon Meredith <jon@jonmeredith.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* ------------------------------------------------------------------- */
#include "bin_helper.h"
#include <string.h>
#include <stdlib.h>
static void bin_helper_check_size(BinHelper* bh, int space_needed)
{
if (bh->bin && (bh->offset + space_needed > bh->bin->orig_size))
{
bh->bin = driver_realloc_binary(bh->bin, bh->offset + space_needed);
}
else if (!bh->bin)
{
bh->bin = driver_alloc_binary(space_needed);
}
}
void bin_helper_init(BinHelper* bh)
{
bh->bin = 0;
bh->offset = 0;
}
void bin_helper_push_byte(BinHelper* bh, int value)
{
bin_helper_check_size(bh, 1);
bh->bin->orig_bytes[bh->offset] = (char)value;
bh->offset++;
}
void bin_helper_push_int32(BinHelper* bh, int value)
{
bin_helper_check_size(bh, 4);
memcpy(bh->bin->orig_bytes+(bh->offset), (char*)&value, 4);
bh->offset += 4;
}
void bin_helper_push_string(BinHelper* bh, const char* string)
{
if (NULL == string)
{
string = "<null>";
}
int sz = strlen(string);
bin_helper_check_size(bh, sz+1);
strncpy(bh->bin->orig_bytes+(bh->offset), string, sz+1);
bh->offset += sz + 1;
}