コード例 #1
0
ファイル: asf.c プロジェクト: Brandon7357/rockbox
static int asf_parse_header(int fd, struct mp3entry* id3,
                                    asf_waveformatex_t* wfx)
{
    asf_object_t current;
    asf_object_t header;
    uint64_t datalen;
    int i;
    int fileprop = 0;
    uint64_t play_duration;
    uint16_t flags;
    uint32_t subobjects;
    uint8_t utf8buf[512];
    int id3buf_remaining = sizeof(id3->id3v2buf) + sizeof(id3->id3v1buf);
    unsigned char* id3buf = (unsigned char*)id3->id3v2buf;

    asf_read_object_header((asf_object_t *) &header, fd);

    //DEBUGF("header.size=%d\n",(int)header.size);
    if (header.size < 30) {
        /* invalid size for header object */
        return ASF_ERROR_OBJECT_SIZE;
    }

    read_uint32le(fd, &subobjects);

    /* Two reserved bytes - do we need to read them? */
    lseek(fd, 2, SEEK_CUR);

    //DEBUGF("Read header - size=%d, subobjects=%d\n",(int)header.size, (int)subobjects);

    if (subobjects > 0) {
        header.datalen = header.size - 30;

        /* TODO: Check that we have datalen bytes left in the file */
        datalen = header.datalen;

        for (i=0; i<(int)subobjects; i++) {
            //DEBUGF("Parsing header object %d - datalen=%d\n",i,(int)datalen);
            if (datalen < 24) {
                //DEBUGF("not enough data for reading object\n");
                break;
            }

            asf_read_object_header(&current, fd);

            if (current.size > datalen || current.size < 24) {
                //DEBUGF("invalid object size - current.size=%d, datalen=%d\n",(int)current.size,(int)datalen);
                break;
            }

            if (asf_guid_match(&current.guid, &asf_guid_file_properties)) {
                    if (current.size < 104)
                        return ASF_ERROR_OBJECT_SIZE;

                    if (fileprop) {
                        /* multiple file properties objects not allowed */
                        return ASF_ERROR_INVALID_OBJECT;
                    }

                    fileprop = 1;
                    
                    /* Get the number of logical packets - uint64_t at offset 32
                     * (little endian byte order) */
                    lseek(fd, 32, SEEK_CUR);
                    read_uint64le(fd, &wfx->numpackets);
                    /*DEBUGF("read packets:  %llx %lld\n", wfx->numpackets, wfx->numpackets);*/
                    
                    /* Now get the play duration - uint64_t at offset 40 */
                    read_uint64le(fd, &play_duration);
                    id3->length = play_duration / 10000;
                    /*DEBUGF("****** length = %lums\n", id3->length);*/

                    /* Read the packet size - uint32_t at offset 68 */
                    lseek(fd, 20, SEEK_CUR);
                    read_uint32le(fd, &wfx->packet_size);

                    /* Skip bytes remaining in object */
                    lseek(fd, current.size - 24 - 72, SEEK_CUR);
            } else if (asf_guid_match(&current.guid, &asf_guid_stream_properties)) {
                    guid_t guid;
                    uint32_t propdatalen;

                    if (current.size < 78)
                        return ASF_ERROR_OBJECT_SIZE;

#if 0
                    asf_byteio_getGUID(&guid, current->data);
                    datalen = asf_byteio_getDWLE(current->data + 40);
                    flags = asf_byteio_getWLE(current->data + 48);
#endif

                    asf_readGUID(fd, &guid);

                    lseek(fd, 24, SEEK_CUR);
                    read_uint32le(fd, &propdatalen);
                    lseek(fd, 4, SEEK_CUR);
                    read_uint16le(fd, &flags);

                    if (!asf_guid_match(&guid, &asf_guid_stream_type_audio)) {
                        //DEBUGF("Found stream properties for non audio stream, skipping\n");
                        lseek(fd,current.size - 24 - 50,SEEK_CUR);
                    } else if (wfx->audiostream == -1) {
                        lseek(fd, 4, SEEK_CUR);
                        //DEBUGF("Found stream properties for audio stream %d\n",flags&0x7f);

                        if (propdatalen < 18) {
                            return ASF_ERROR_INVALID_LENGTH;
                        }

#if 0
                        if (asf_byteio_getWLE(data + 16) > datalen - 16) {
                            return ASF_ERROR_INVALID_LENGTH;
                        }
#endif
                        read_uint16le(fd, &wfx->codec_id);
                        read_uint16le(fd, &wfx->channels);
                        read_uint32le(fd, &wfx->rate);
                        read_uint32le(fd, &wfx->bitrate);
                        wfx->bitrate *= 8;
                        read_uint16le(fd, &wfx->blockalign);
                        read_uint16le(fd, &wfx->bitspersample);
                        read_uint16le(fd, &wfx->datalen);

                        /*sanity check the included bitrate by comparing to file size and length*/
                        unsigned int estimated_bitrate =  (wfx->packet_size*wfx->numpackets)/id3->length*8000;

                        /*in theory we could just use the estimated bitrate always,
                          but its safer to underestimate*/
                        if( wfx->bitrate > estimated_bitrate)
                        {
                            /* Round bitrate to the nearest kbit */
                            id3->bitrate = (estimated_bitrate + 500) / 1000;
                        }
                        else
                        {
                            /* Round bitrate to the nearest kbit */
                            id3->bitrate = (wfx->bitrate + 500) / 1000;
                        }
                        /*DEBUGF("bitrate:  %d estimated:  %d\n", wfx->bitrate, estimated_bitrate);*/
                        id3->frequency = wfx->rate;

                        if (wfx->codec_id == ASF_CODEC_ID_WMAV1) {
                            read(fd, wfx->data, 4);
                            lseek(fd,current.size - 24 - 72 - 4,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAV2) {
                            read(fd, wfx->data, 6);
                            lseek(fd,current.size - 24 - 72 - 6,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAPRO) {
                            /* wma pro decoder needs the extra-data */
                            read(fd, wfx->data, wfx->datalen);
                            lseek(fd,current.size - 24 - 72 - wfx->datalen,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                            /* Correct codectype to redirect playback to the proper .codec */
                            id3->codectype = AFMT_WMAPRO;
                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAVOICE) {
                            read(fd, wfx->data, wfx->datalen);
                            lseek(fd,current.size - 24 - 72 - wfx->datalen,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                            id3->codectype = AFMT_WMAVOICE;
                        } else {
                            DEBUGF("Unsupported WMA codec (Lossless, Voice, etc)\n");
                            lseek(fd,current.size - 24 - 72,SEEK_CUR);
                        }

                    }
            } else if (asf_guid_match(&current.guid, &asf_guid_content_description)) {
                    /* Object contains five 16-bit string lengths, followed by the five strings:
                       title, artist, copyright, description, rating
                     */
                    uint16_t strlength[5];
                    int i;

                    //DEBUGF("Found GUID_CONTENT_DESCRIPTION - size=%d\n",(int)(current.size - 24));

                    /* Read the 5 string lengths - number of bytes included trailing zero */
                    for (i=0; i<5; i++) {
                        read_uint16le(fd, &strlength[i]);
                        //DEBUGF("strlength = %u\n",strlength[i]);
                    }

                    if (strlength[0] > 0) {  /* 0 - Title */
                        id3->title = id3buf;
                        asf_utf16LEdecode(fd, strlength[0], &id3buf, &id3buf_remaining);
                    }

                    if (strlength[1] > 0) {  /* 1 - Artist */
                        id3->artist = id3buf;
                        asf_utf16LEdecode(fd, strlength[1], &id3buf, &id3buf_remaining);
                    }

                    lseek(fd, strlength[2], SEEK_CUR); /* 2 - copyright */

                    if (strlength[3] > 0) {  /* 3 - description */
                        id3->comment = id3buf;
                        asf_utf16LEdecode(fd, strlength[3], &id3buf, &id3buf_remaining);
                    }

                    lseek(fd, strlength[4], SEEK_CUR); /* 4 - rating */
            } else if (asf_guid_match(&current.guid, &asf_guid_extended_content_description)) {
                    uint16_t count;
                    int i;
                    int bytesleft = current.size - 24;
                    //DEBUGF("Found GUID_EXTENDED_CONTENT_DESCRIPTION\n");

                    read_uint16le(fd, &count);
                    bytesleft -= 2;
                    //DEBUGF("extended metadata count = %u\n",count);

                    for (i=0; i < count; i++) {
                        uint16_t length, type;
                        unsigned char* utf8 = utf8buf;
                        int utf8length = 512;

                        read_uint16le(fd, &length);
                        asf_utf16LEdecode(fd, length, &utf8, &utf8length);
                        bytesleft -= 2 + length;

                        read_uint16le(fd, &type);
                        read_uint16le(fd, &length);

                        if (!strcmp("WM/TrackNumber",utf8buf)) {
                            if (type == 0) {
                                id3->track_string = id3buf;
                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                                id3->tracknum = atoi(id3->track_string);
                            } else if ((type >=2) && (type <= 5)) {
                                id3->tracknum = asf_intdecode(fd, type, length);
                            } else {
                                lseek(fd, length, SEEK_CUR);
                            }
                        } else if ((!strcmp("WM/Genre", utf8buf)) && (type == 0)) {
                            id3->genre_string = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/AlbumTitle", utf8buf)) && (type == 0)) {
                            id3->album = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/AlbumArtist", utf8buf)) && (type == 0)) {
                            id3->albumartist = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/Composer", utf8buf)) && (type == 0)) {
                            id3->composer = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if (!strcmp("WM/Year", utf8buf)) {
                            if (type == 0) {
                                id3->year_string = id3buf;
                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                                id3->year = atoi(id3->year_string);
                            } else if ((type >=2) && (type <= 5)) {
                                id3->year = asf_intdecode(fd, type, length);
                            } else {
                                lseek(fd, length, SEEK_CUR);
                            }
                        } else if (!strncmp("replaygain_", utf8buf, 11)) {
                            char *value = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                            parse_replaygain(utf8buf, value, id3);
                        } else if (!strcmp("MusicBrainz/Track Id", utf8buf)) {
                            id3->mb_track_id = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
#ifdef HAVE_ALBUMART
                        } else if (!strcmp("WM/Picture", utf8buf)) {
                            uint32_t datalength, strlength;
                            /* Expected is either "01 00 xx xx 03 yy yy yy yy" or
                             * "03 yy yy yy yy". xx is the size of the WM/Picture 
                             * container in bytes. yy equals the raw data length of 
                             * the embedded image. */
                            lseek(fd, -4, SEEK_CUR);
                            read(fd, &type, 1);
                            if (type == 1) {
                                lseek(fd, 3, SEEK_CUR);
                                read(fd, &type, 1);
                                /* In case the parsing will fail in the next step we 
                                 * might at least be able to skip the whole section. */
                                datalength = length - 1;
                            }
                            if (type == 3) {
                                /* Read the raw data length of the embedded image. */
                                read_uint32le(fd, &datalength);
                            
                                /* Reset utf8 buffer */
                                utf8 = utf8buf;
                                utf8length = 512;

                                /* Gather the album art format, this string has a
                                 * double zero-termination. */
                                asf_utf16LEdecode(fd, 32, &utf8, &utf8length);
                                strlength = (strlen(utf8buf) + 2) * 2;
                                lseek(fd, strlength-32, SEEK_CUR);
                                if (!strcmp("image/jpeg", utf8buf)) {
                                    id3->albumart.type = AA_TYPE_JPG;
                                } else if (!strcmp("image/jpg", utf8buf)) {
                                    /* image/jpg is technically invalid,
                                     * but it does occur in the wild */
                                    id3->albumart.type = AA_TYPE_JPG;
                                } else if (!strcmp("image/png", utf8buf)) {
                                    id3->albumart.type = AA_TYPE_PNG;
                                } else {
                                    id3->albumart.type = AA_TYPE_UNKNOWN;
                                }

                                /* Set the album art size and position. */
                                if (id3->albumart.type != AA_TYPE_UNKNOWN) {
                                    id3->albumart.pos  = lseek(fd, 0, SEEK_CUR);
                                    id3->albumart.size = datalength;
                                    id3->has_embedded_albumart = true;
                                }
                            }
                            
                            lseek(fd, datalength, SEEK_CUR);
#endif
                        } else {
                            lseek(fd, length, SEEK_CUR);
                        }
                        bytesleft -= 4 + length;
                    }

                    lseek(fd, bytesleft, SEEK_CUR);
            } else if (asf_guid_match(&current.guid, &asf_guid_content_encryption)
                || asf_guid_match(&current.guid, &asf_guid_extended_content_encryption)) {
                //DEBUGF("File is encrypted\n");
                return ASF_ERROR_ENCRYPTED;
            } else {
                //DEBUGF("Skipping %d bytes of object\n",(int)(current.size - 24));
                lseek(fd,current.size - 24,SEEK_CUR);
            }

            //DEBUGF("Parsed object - size = %d\n",(int)current.size);
            datalen -= current.size;
        }

        if (i != (int)subobjects || datalen != 0) {
            //DEBUGF("header data doesn't match given subobject count\n");
            return ASF_ERROR_INVALID_VALUE;
        }

        //DEBUGF("%d subobjects read successfully\n", i);
    }

#if 0
    tmp = asf_parse_header_validate(file, &header);
    if (tmp < 0) {
        /* header read ok but doesn't validate correctly */
        return tmp;
    }
#endif

    //DEBUGF("header validated correctly\n");

    return 0;
}
コード例 #2
0
ファイル: asf.c プロジェクト: eisnerd/rockbox
static int asf_parse_header(int fd, struct mp3entry* id3,
                                    asf_waveformatex_t* wfx)
{
    asf_object_t current;
    asf_object_t header;
    uint64_t datalen;
    int i;
    int fileprop = 0;
    uint64_t play_duration;
    uint16_t flags;
    uint32_t subobjects;
    uint8_t utf8buf[512];
    int id3buf_remaining = sizeof(id3->id3v2buf) + sizeof(id3->id3v1buf);
    unsigned char* id3buf = (unsigned char*)id3->id3v2buf;

    asf_read_object_header((asf_object_t *) &header, fd);

    //DEBUGF("header.size=%d\n",(int)header.size);
    if (header.size < 30) {
        /* invalid size for header object */
        return ASF_ERROR_OBJECT_SIZE;
    }

    read_uint32le(fd, &subobjects);

    /* Two reserved bytes - do we need to read them? */
    lseek(fd, 2, SEEK_CUR);

    //DEBUGF("Read header - size=%d, subobjects=%d\n",(int)header.size, (int)subobjects);

    if (subobjects > 0) {
        header.datalen = header.size - 30;

        /* TODO: Check that we have datalen bytes left in the file */
        datalen = header.datalen;

        for (i=0; i<(int)subobjects; i++) {
            //DEBUGF("Parsing header object %d - datalen=%d\n",i,(int)datalen);
            if (datalen < 24) {
                //DEBUGF("not enough data for reading object\n");
                break;
            }

            asf_read_object_header(&current, fd);

            if (current.size > datalen || current.size < 24) {
                //DEBUGF("invalid object size - current.size=%d, datalen=%d\n",(int)current.size,(int)datalen);
                break;
            }

            if (asf_guid_match(&current.guid, &asf_guid_file_properties)) {
                    if (current.size < 104)
                        return ASF_ERROR_OBJECT_SIZE;

                    if (fileprop) {
                        /* multiple file properties objects not allowed */
                        return ASF_ERROR_INVALID_OBJECT;
                    }

                    fileprop = 1;
                    
                    /* Get the number of logical packets - uint16_t at offset 31 
                     * (Big endian byte order) */
                    lseek(fd, 31, SEEK_CUR);
                    read_uint16be(fd, &wfx->numpackets);
                    
                    /* Now get the play duration - uint64_t at offset 40 */
                    lseek(fd, 7, SEEK_CUR);
                    read_uint64le(fd, &play_duration);
                    id3->length = play_duration / 10000;

                    //DEBUGF("****** length = %lums\n", id3->length);

                    /* Read the packet size - uint32_t at offset 68 */
                    lseek(fd, 20, SEEK_CUR);
                    read_uint32le(fd, &wfx->packet_size);

                    /* Skip bytes remaining in object */
                    lseek(fd, current.size - 24 - 72, SEEK_CUR);
            } else if (asf_guid_match(&current.guid, &asf_guid_stream_properties)) {
                    guid_t guid;
                    uint32_t propdatalen;

                    if (current.size < 78)
                        return ASF_ERROR_OBJECT_SIZE;

#if 0
                    asf_byteio_getGUID(&guid, current->data);
                    datalen = asf_byteio_getDWLE(current->data + 40);
                    flags = asf_byteio_getWLE(current->data + 48);
#endif

                    asf_readGUID(fd, &guid);

                    lseek(fd, 24, SEEK_CUR);
                    read_uint32le(fd, &propdatalen);
                    lseek(fd, 4, SEEK_CUR);
                    read_uint16le(fd, &flags);

                    if (!asf_guid_match(&guid, &asf_guid_stream_type_audio)) {
                        //DEBUGF("Found stream properties for non audio stream, skipping\n");
                        lseek(fd,current.size - 24 - 50,SEEK_CUR);
                    } else if (wfx->audiostream == -1) {
                        lseek(fd, 4, SEEK_CUR);
                        //DEBUGF("Found stream properties for audio stream %d\n",flags&0x7f);

                        if (propdatalen < 18) {
                            return ASF_ERROR_INVALID_LENGTH;
                        }

#if 0
                        if (asf_byteio_getWLE(data + 16) > datalen - 16) {
                            return ASF_ERROR_INVALID_LENGTH;
                        }
#endif
                        read_uint16le(fd, &wfx->codec_id);
                        read_uint16le(fd, &wfx->channels);
                        read_uint32le(fd, &wfx->rate);
                        read_uint32le(fd, &wfx->bitrate);
                        wfx->bitrate *= 8;
                        read_uint16le(fd, &wfx->blockalign);
                        read_uint16le(fd, &wfx->bitspersample);
                        read_uint16le(fd, &wfx->datalen);

                        /* Round bitrate to the nearest kbit */
                        id3->bitrate = (wfx->bitrate + 500) / 1000;
                        id3->frequency = wfx->rate;

                        if (wfx->codec_id == ASF_CODEC_ID_WMAV1) {
                            read(fd, wfx->data, 4);
                            lseek(fd,current.size - 24 - 72 - 4,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAV2) {
                            read(fd, wfx->data, 6);
                            lseek(fd,current.size - 24 - 72 - 6,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                        } else if (wfx->codec_id == ASF_CODEC_ID_WMAPRO) {
                            /* wma pro decoder needs the extra-data */
                            read(fd, wfx->data, wfx->datalen);
                            lseek(fd,current.size - 24 - 72 - wfx->datalen,SEEK_CUR);
                            wfx->audiostream = flags&0x7f;
                            /* Correct codectype to redirect playback to the proper .codec */
                            id3->codectype = AFMT_WMAPRO;
                        } else {
                            DEBUGF("Unsupported WMA codec (Lossless, Voice, etc)\n");
                            lseek(fd,current.size - 24 - 72,SEEK_CUR);
                        }

                    }
            } else if (asf_guid_match(&current.guid, &asf_guid_content_description)) {
                    /* Object contains five 16-bit string lengths, followed by the five strings:
                       title, artist, copyright, description, rating
                     */
                    uint16_t strlength[5];
                    int i;

                    //DEBUGF("Found GUID_CONTENT_DESCRIPTION - size=%d\n",(int)(current.size - 24));

                    /* Read the 5 string lengths - number of bytes included trailing zero */
                    for (i=0; i<5; i++) {
                        read_uint16le(fd, &strlength[i]);
                        //DEBUGF("strlength = %u\n",strlength[i]);
                    }

                    if (strlength[0] > 0) {  /* 0 - Title */
                        id3->title = id3buf;
                        asf_utf16LEdecode(fd, strlength[0], &id3buf, &id3buf_remaining);
                    }

                    if (strlength[1] > 0) {  /* 1 - Artist */
                        id3->artist = id3buf;
                        asf_utf16LEdecode(fd, strlength[1], &id3buf, &id3buf_remaining);
                    }

                    lseek(fd, strlength[2], SEEK_CUR); /* 2 - copyright */

                    if (strlength[3] > 0) {  /* 3 - description */
                        id3->comment = id3buf;
                        asf_utf16LEdecode(fd, strlength[3], &id3buf, &id3buf_remaining);
                    }

                    lseek(fd, strlength[4], SEEK_CUR); /* 4 - rating */
            } else if (asf_guid_match(&current.guid, &asf_guid_extended_content_description)) {
                    uint16_t count;
                    int i;
                    int bytesleft = current.size - 24;
                    //DEBUGF("Found GUID_EXTENDED_CONTENT_DESCRIPTION\n");

                    read_uint16le(fd, &count);
                    bytesleft -= 2;
                    //DEBUGF("extended metadata count = %u\n",count);

                    for (i=0; i < count; i++) {
                        uint16_t length, type;
                        unsigned char* utf8 = utf8buf;
                        int utf8length = 512;

                        read_uint16le(fd, &length);
                        asf_utf16LEdecode(fd, length, &utf8, &utf8length);
                        bytesleft -= 2 + length;

                        read_uint16le(fd, &type);
                        read_uint16le(fd, &length);

                        if (!strcmp("WM/TrackNumber",utf8buf)) {
                            if (type == 0) {
                                id3->track_string = id3buf;
                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                                id3->tracknum = atoi(id3->track_string);
                            } else if ((type >=2) && (type <= 5)) {
                                id3->tracknum = asf_intdecode(fd, type, length);
                            } else {
                                lseek(fd, length, SEEK_CUR);
                            }
                        } else if ((!strcmp("WM/Genre", utf8buf)) && (type == 0)) {
                            id3->genre_string = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/AlbumTitle", utf8buf)) && (type == 0)) {
                            id3->album = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/AlbumArtist", utf8buf)) && (type == 0)) {
                            id3->albumartist = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if ((!strcmp("WM/Composer", utf8buf)) && (type == 0)) {
                            id3->composer = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else if (!strcmp("WM/Year", utf8buf)) {
                            if (type == 0) {
                                id3->year_string = id3buf;
                                asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                                id3->year = atoi(id3->year_string);
                            } else if ((type >=2) && (type <= 5)) {
                                id3->year = asf_intdecode(fd, type, length);
                            } else {
                                lseek(fd, length, SEEK_CUR);
                            }
                        } else if (!strncmp("replaygain_", utf8buf, 11)) {
                            char* value = id3buf;
                            int buf_len = id3buf_remaining;
                            int len;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                            len = parse_replaygain(utf8buf, value, id3, 
                                value, buf_len);
                            
                            if (len == 0) {
                                /* Don't need to keep the value */
                                id3buf = value;
                                id3buf_remaining = buf_len;
                            }
                        } else if (!strcmp("MusicBrainz/Track Id", utf8buf)) {
                            id3->mb_track_id = id3buf;
                            asf_utf16LEdecode(fd, length, &id3buf, &id3buf_remaining);
                        } else {
                            lseek(fd, length, SEEK_CUR);
                        }
                        bytesleft -= 4 + length;
                    }

                    lseek(fd, bytesleft, SEEK_CUR);
            } else if (asf_guid_match(&current.guid, &asf_guid_content_encryption)
                || asf_guid_match(&current.guid, &asf_guid_extended_content_encryption)) {
                //DEBUGF("File is encrypted\n");
                return ASF_ERROR_ENCRYPTED;
            } else {
                //DEBUGF("Skipping %d bytes of object\n",(int)(current.size - 24));
                lseek(fd,current.size - 24,SEEK_CUR);
            }

            //DEBUGF("Parsed object - size = %d\n",(int)current.size);
            datalen -= current.size;
        }

        if (i != (int)subobjects || datalen != 0) {
            //DEBUGF("header data doesn't match given subobject count\n");
            return ASF_ERROR_INVALID_VALUE;
        }

        //DEBUGF("%d subobjects read successfully\n", i);
    }

#if 0
    tmp = asf_parse_header_validate(file, &header);
    if (tmp < 0) {
        /* header read ok but doesn't validate correctly */
        return tmp;
    }
#endif

    //DEBUGF("header validated correctly\n");

    return 0;
}