2 * header.c -- part of ZilUtils/ZilAsm
4 * Copyright (C) 2016, 2019 Jason Self <j@jxself.org>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Affero General Public License as
8 * published by the Free Software Foundation, either version 3 of the
9 * License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Affero General Public License for more details.
16 * You should have received a copy of the GNU Affero General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>
19 * SPDX-License-Identifier: AGPL-3.0-or-later
22 #include <string.h> /* bzero */
28 Program_header_struct Program_header;
30 const unsigned MAX_HEADER_LEN = 40;
32 void program_header_reset(unsigned zversion)
34 bzero(&Program_header, sizeof(Program_header));
35 Program_header.version = zversion;
38 ZMemblock *program_header_build(void)
40 ZMemblock *zmb = zmem_init(MAX_HEADER_LEN);
41 zmem_putbyte(zmb, Program_header.version);
47 Word swapBytes(Word w)
49 return ((w & 255) << 8) + (w >> 8);
53 void outputToFile(Program_header_struct *pHeader, FILE* file)
55 Program_header_struct h;
56 memcpy(&h, pHeader, sizeof(Program_header_struct));
58 h.startPC = swapBytes(h.startPC);
59 h.h_file_size = swapBytes(h.h_file_size);
60 fwrite(&h, sizeof(Program_header_struct), 1, file);