if (current_palette >= wc3->palette_count)
if ((unsigned)current_palette >= wc3->palette_count)
static int wc3_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    Wc3DemuxContext *wc3 = (Wc3DemuxContext *)s->priv_data;    ByteIOContext *pb = &s->pb;    unsigned int fourcc_tag;    unsigned int size;    AVStream *st;    unsigned char preamble[WC3_PREAMBLE_SIZE];    int ret = 0;    int current_palette = 0;    int bytes_to_read;    int i;    unsigned char rotate;    /* default context members */    wc3->width = WC3_DEFAULT_WIDTH;    wc3->height = WC3_DEFAULT_HEIGHT;    wc3->palettes = NULL;    wc3->palette_count = 0;    wc3->pts = 0;    wc3->video_stream_index = wc3->audio_stream_index = 0;    /* skip the first 3 32-bit numbers */    url_fseek(pb, 12, SEEK_CUR);    /* traverse through the chunks and load the header information before     * the first BRCH tag */    if ((ret = get_buffer(pb, preamble, WC3_PREAMBLE_SIZE)) !=         WC3_PREAMBLE_SIZE)        return AVERROR_IO;    fourcc_tag = LE_32(&preamble[0]);    size = (BE_32(&preamble[4]) + 1) & (~1);    do {        switch (fourcc_tag) {        case SOND_TAG:        case INDX_TAG:            /* SOND unknown, INDX unnecessary; ignore both */            url_fseek(pb, size, SEEK_CUR);            break;        case _PC__TAG:            /* need the number of palettes */            url_fseek(pb, 8, SEEK_CUR);            if ((ret = get_buffer(pb, preamble, 4)) != 4)                return AVERROR_IO;            wc3->palette_count = LE_32(&preamble[0]);            if((unsigned)wc3->palette_count >= UINT_MAX / PALETTE_SIZE)                return -1;            wc3->palettes = av_malloc(wc3->palette_count * PALETTE_SIZE);            break;        case BNAM_TAG:            /* load up the name */            if (size < 512)                bytes_to_read = size;            else                bytes_to_read = 512;            if ((ret = get_buffer(pb, s->title, bytes_to_read)) != bytes_to_read)                return AVERROR_IO;            break;        case SIZE_TAG:            /* video resolution override */            if ((ret = get_buffer(pb, preamble, WC3_PREAMBLE_SIZE)) !=                 WC3_PREAMBLE_SIZE)                return AVERROR_IO;            wc3->width = LE_32(&preamble[0]);            wc3->height = LE_32(&preamble[4]);            break;        case PALT_TAG:            /* one of several palettes */            if (current_palette >= wc3->palette_count)                return AVERROR_INVALIDDATA;            if ((ret = get_buffer(pb,                 &wc3->palettes[current_palette * PALETTE_SIZE],                 PALETTE_SIZE)) != PALETTE_SIZE)                return AVERROR_IO;            /* transform the current palette in place */            for (i = current_palette * PALETTE_SIZE;                 i < (current_palette + 1) * PALETTE_SIZE; i++) {                /* rotate each palette component left by 2 and use the result                 * as an index into the color component table */                rotate = ((wc3->palettes[i] << 2) & 0xFF) |                          ((wc3->palettes[i] >> 6) & 0xFF);                wc3->palettes[i] = wc3_pal_lookup[rotate];            }            current_palette++;            break;        default:            av_log(s, AV_LOG_ERROR, "  unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",                preamble[0], preamble[1], preamble[2], preamble[3],                preamble[0], preamble[1], preamble[2], preamble[3]);            return AVERROR_INVALIDDATA;            break;        }        if ((ret = get_buffer(pb, preamble, WC3_PREAMBLE_SIZE)) !=             WC3_PREAMBLE_SIZE)            return AVERROR_IO;        fourcc_tag = LE_32(&preamble[0]);        /* chunk sizes are 16-bit aligned */        size = (BE_32(&preamble[4]) + 1) & (~1);    } while (fourcc_tag != BRCH_TAG);    /* initialize the decoder streams */    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    av_set_pts_info(st, 33, 1, 90000);    wc3->video_stream_index = st->index;    st->codec.codec_type = CODEC_TYPE_VIDEO;    st->codec.codec_id = CODEC_ID_XAN_WC3;    st->codec.codec_tag = 0;  /* no fourcc */    st->codec.width = wc3->width;    st->codec.height = wc3->height;    /* palette considerations */    st->codec.palctrl = &wc3->palette_control;    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    av_set_pts_info(st, 33, 1, 90000);    wc3->audio_stream_index = st->index;    st->codec.codec_type = CODEC_TYPE_AUDIO;    st->codec.codec_id = CODEC_ID_PCM_S16LE;    st->codec.codec_tag = 1;    st->codec.channels = WC3_AUDIO_CHANNELS;    st->codec.bits_per_sample = WC3_AUDIO_BITS;    st->codec.sample_rate = WC3_SAMPLE_RATE;    st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *        st->codec.bits_per_sample;    st->codec.block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;    return 0;}