forked from osmocom/wireshark
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* mp4.c
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*
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* MP4 (ISO/IEC 14496-12) file format decoder for the Wiretap library.
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*
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* Wiretap Library
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "mp4.h"
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#include <string.h>
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#include "file_wrappers.h"
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#include "wtap-int.h"
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static const guint8 mp4_magic[] = { 'f', 't', 'y', 'p' };
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static const guint8 mp4_magic_sidx[] = { 's', 'i', 'd', 'x' };
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static const guint8 mp4_magic_styp[] = { 's', 't', 'y', 'p' };
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static int mp4_file_type_subtype = -1;
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void register_mp4(void);
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wtap_open_return_val
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mp4_open(wtap *wth, int *err, gchar **err_info)
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{
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char magic_buf[8];
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int bytes_read;
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bytes_read = file_read(magic_buf, sizeof (magic_buf), wth->fh);
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if (bytes_read < 0) {
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*err = file_error(wth->fh, err_info);
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return WTAP_OPEN_ERROR;
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}
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if (bytes_read == 0)
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return WTAP_OPEN_NOT_MINE;
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if (bytes_read == sizeof (magic_buf) &&
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memcmp(magic_buf + 4, mp4_magic, sizeof (mp4_magic)) &&
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memcmp(magic_buf + 4, mp4_magic_sidx, sizeof (mp4_magic_sidx)) &&
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memcmp(magic_buf + 4, mp4_magic_styp, sizeof (mp4_magic_styp)))
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return WTAP_OPEN_NOT_MINE;
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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wth->file_type_subtype = mp4_file_type_subtype;
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wth->file_encap = WTAP_ENCAP_MP4;
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wth->file_tsprec = WTAP_TSPREC_SEC;
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wth->subtype_read = wtap_full_file_read;
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wth->subtype_seek_read = wtap_full_file_seek_read;
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wth->snapshot_length = 0;
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return WTAP_OPEN_MINE;
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}
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static const struct supported_block_type mp4_blocks_supported[] = {
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/*
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* This is a file format that we dissect, so we provide
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* only one "packet" with the file's contents, and don't
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* support any options.
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*/
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{ WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
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};
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static const struct file_type_subtype_info mp4_info = {
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"MP4 media", "mp4", "mp4", NULL,
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FALSE, BLOCKS_SUPPORTED(mp4_blocks_supported),
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NULL, NULL, NULL
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};
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void register_mp4(void)
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{
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mp4_file_type_subtype = wtap_register_file_type_subtype(&mp4_info);
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/*
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* Register name for backwards compatibility with the
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* wtap_filetypes table in Lua.
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*/
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wtap_register_backwards_compatibility_lua_name("MP4",
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mp4_file_type_subtype);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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