bitheader.h

/*
 * Copyright (C) 2006, 2007 Jean-Baptiste Note <jean-baptiste.note@m4x.org>
 *
 * This file is part of debit.
 *
 * Debit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Debit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with debit.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _HAS_BITHEADER_H
#define _HAS_BITHEADER_H

/*
 * Bitstream header parsing
 */

#include <glib.h>
#include "debitlog.h"

#define FIRST_OPTION_OFFSET 11

typedef enum option_type {
  FILENAME = 'a',
  DEVICE_TYPE = 'b',
  BUILD_DATE = 'c',
  BUILD_TIME = 'd',
  CODE = 'e',
  LAST_OPTION,
} option_type_t;

#pragma pack(1)

struct header_option {
  guint8 code;
  guint16 length;
  gchar payload[];
} __attribute__((packed));

struct synchro_option {
  guint8  code;
  guint32 bitstream_length;
  guint32 data[];
} __attribute__((packed));

#pragma pack()

typedef struct _header_option_p {
  guint16 len;
  const char *data;
} header_option_p;

typedef struct _parsed_header {
  header_option_p options[ LAST_OPTION - FILENAME ];
} parsed_header_t;

typedef struct header_option header_option_t;
typedef struct synchro_option synchro_option_t;

static inline unsigned
get_option_len(const header_option_t *opt) {
  return GINT16_FROM_BE(opt->length);
}

static inline const header_option_p*
get_option(const parsed_header_t *header,
	   const option_type_t opt) {
  return &header->options[opt - FILENAME];
}

static inline void
write_option(parsed_header_t *header,
	     const option_type_t opt,
	     const void *data, const unsigned len) {
  header_option_p *hopt = &header->options[opt - FILENAME];
  hopt->data = data;
  hopt->len = len;
}

static inline
header_option_t *next_option(const header_option_t *data) {
  gint len = GINT16_FROM_BE(data->length);
  return (void *)&data->payload[len];
}

int parse_header(parsed_header_t *parse,
		 const gchar *buf, const size_t buf_len);

#endif /* _HAS_BITHEADER_H */