49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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/* -------------------------------------------------------------------
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*
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* bin_helper: ErlDrvBinary helper functions
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* Copyright (c) 2008 The Hive. All rights reserved.
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*
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* ------------------------------------------------------------------- */
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#include "bin_helper.h"
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#include <string.h>
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#include <stdlib.h>
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static void bin_helper_check_size(BinHelper* bh, int space_needed)
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{
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if (bh->offset + space_needed > bh->bin->orig_size)
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{
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// Need to realloc space -- grow by 2 * space_needed
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bh->bin = driver_realloc_binary(bh->bin, bh->bin->orig_size + (2 * space_needed));
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}
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}
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void bin_helper_init(BinHelper* bh, unsigned int size)
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{
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bh->bin = driver_alloc_binary(size);
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bh->offset = 0;
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}
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void bin_helper_push_byte(BinHelper* bh, int value)
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{
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bin_helper_check_size(bh, 1);
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bh->bin->orig_bytes[bh->offset] = (char)value;
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bh->offset++;
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}
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void bin_helper_push_int32(BinHelper* bh, int value)
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{
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bin_helper_check_size(bh, 4);
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memcpy(bh->bin->orig_bytes+(bh->offset), (char*)&value, 4);
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bh->offset += 4;
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}
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void bin_helper_push_string(BinHelper* bh, const char* string)
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{
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int sz = strlen(string);
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bin_helper_check_size(bh, sz+1);
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strncpy(bh->bin->orig_bytes+(bh->offset), string, sz+1);
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bh->offset += sz + 1;
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}
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