52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/* -------------------------------------------------------------------
|
|
*
|
|
* bin_helper: ErlDrvBinary helper functions
|
|
* Copyright (c) 2008 The Hive. All rights reserved.
|
|
*
|
|
* ------------------------------------------------------------------- */
|
|
#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)
|
|
{
|
|
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;
|
|
}
|