Function decode_block

libavcodec/exr.c:1248–1541

}

static int decode_block(AVCodecContext *avctx, void *tdata,
                        int jobnr, int threadnr)
{
    const EXRContext *s = avctx->priv_data;
    AVFrame *const p = s->picture;
    EXRThreadData *td = &s->thread_data[threadnr];
    const uint8_t *channel_buffer[4] = { 0 };
    const uint8_t *buf = s->buf;
    uint64_t line_offset, uncompressed_size;
    uint8_t *ptr;
    uint32_t data_size;
    int line, col = 0;
    uint64_t tile_x, tile_y, tile_level_x, tile_level_y;
    const uint8_t *src;
    int step = s->desc->comp[0].step;
    int bxmin = 0, axmax = 0, window_xoffset = 0;
    int window_xmin, window_xmax, window_ymin, window_ymax;
    int data_xoffset, data_yoffset, data_window_offset, xsize, ysize;
    int i, x, buf_size = s->buf_size;
    int c, rgb_channel_count;
#if FF_API_EXR_GAMMA
    float one_gamma = 1.0f / s->gamma;
    av_csp_trc_function trc_func = av_csp_trc_func_from_id(s->apply_trc_type);
#endif
    int ret;

    line_offset = AV_RL64(s->gb.buffer + jobnr * 8);

    if (s->is_tile) {
        if (buf_size < 20 || line_offset > buf_size - 20)
            return AVERROR_INVALIDDATA;

        src  = buf + line_offset + 20;
        if (s->is_multipart)
            src += 4;

        tile_x = AV_RL32(src - 20);
        tile_y = AV_RL32(src - 16);
        tile_level_x = AV_RL32(src - 12);
        tile_level_y = AV_RL32(src - 8);

        data_size = AV_RL32(src - 4);
        if (data_size <= 0 || data_size > buf_size - line_offset - 20)
            return AVERROR_INVALIDDATA;

        if (tile_level_x || tile_level_y) { /* tile level, is not the full res level */
            avpriv_report_missing_feature(s->avctx, "Subres tile before full res tile");
            return AVERROR_PATCHWELCOME;
        }

        if (tile_x && s->tile_attr.xSize + (int64_t)FFMAX(s->xmin, 0) >= INT_MAX / tile_x )
            return AVERROR_INVALIDDATA;
        if (tile_y && s->tile_attr.ySize + (int64_t)FFMAX(s->ymin, 0) >= INT_MAX / tile_y )
            return AVERROR_INVALIDDATA;

        line = s->ymin + s->tile_attr.ySize * tile_y;
        col = s->tile_attr.xSize * tile_x;