static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height)

{

    const uint8_t *frame_start = frame;

    const uint8_t *frame_end   = frame + width * height;

    int mask = 0x10000, bitbuf = 0;

    int v, count, segments;

    unsigned offset;



    segments = bytestream2_get_le32(gb);

    offset   = bytestream2_get_le32(gb);

    if (segments == 0 && offset == frame_end - frame)

        return 0; // skip frame

    if (frame_end - frame <= offset)

        return AVERROR_INVALIDDATA;

    frame += offset;

    while (segments--) {

        if (bytestream2_get_bytes_left(gb) < 2)

            return AVERROR_INVALIDDATA;

        if (mask == 0x10000) {

            bitbuf = bytestream2_get_le16u(gb);

            mask = 1;

        }

        if (frame_end - frame < 2)

            return AVERROR_INVALIDDATA;

        if (bitbuf & mask) {

            v = bytestream2_get_le16(gb);

            offset = (v & 0x1FFF) << 1;

            count = ((v >> 13) + 2) << 1;

            if (frame - frame_start < offset || frame_end - frame < count)

                return AVERROR_INVALIDDATA;

            av_memcpy_backptr(frame, offset, count);

            frame += count;

        } else {

            *frame++ = bytestream2_get_byte(gb);

            *frame++ = bytestream2_get_byte(gb);

        }

        mask <<= 1;

    }



    return 0;

}

static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height)

{

    const uint8_t *frame_start = frame;

    const uint8_t *frame_end   = frame + width * height;

    int mask = 0x10000, bitbuf = 0;

    int v, count, segments;

    unsigned offset;



    segments = bytestream2_get_le32(gb);

    offset   = bytestream2_get_le32(gb);

    if (segments == 0 && offset == frame_end - frame)

        return 0; 

    if (frame_end - frame <= offset)

        return AVERROR_INVALIDDATA;

    frame += offset;

    while (segments--) {

        if (bytestream2_get_bytes_left(gb) < 2)

            return AVERROR_INVALIDDATA;

        if (mask == 0x10000) {

            bitbuf = bytestream2_get_le16u(gb);

            mask = 1;

        }

        if (frame_end - frame < 2)

            return AVERROR_INVALIDDATA;

        if (bitbuf & mask) {

            v = bytestream2_get_le16(gb);

            offset = (v & 0x1FFF) << 1;

            count = ((v >> 13) + 2) << 1;

            if (frame - frame_start < offset || frame_end - frame < count)

                return AVERROR_INVALIDDATA;

            av_memcpy_backptr(frame, offset, count);

            frame += count;

        } else {

            *frame++ = bytestream2_get_byte(gb);

            *frame++ = bytestream2_get_byte(gb);

        }

        mask <<= 1;

    }



    return 0;

}

    int v, count, segments;
static int FUNC_0(GetByteContext *VAR_0, uint8_t *VAR_1, int VAR_2, int VAR_3)

{

    const uint8_t *VAR_4 = VAR_1;

    const uint8_t *VAR_5   = VAR_1 + VAR_2 * VAR_3;

    int VAR_6 = 0x10000, VAR_7 = 0;

    int VAR_8, VAR_9, VAR_10;

    unsigned VAR_11;



    VAR_10 = bytestream2_get_le32(VAR_0);

    VAR_11   = bytestream2_get_le32(VAR_0);

    if (VAR_10 == 0 && VAR_11 == VAR_5 - VAR_1)

        return 0; 

    if (VAR_5 - VAR_1 <= VAR_11)

        return AVERROR_INVALIDDATA;

    VAR_1 += VAR_11;

    while (VAR_10--) {

        if (bytestream2_get_bytes_left(VAR_0) < 2)

            return AVERROR_INVALIDDATA;

        if (VAR_6 == 0x10000) {

            VAR_7 = bytestream2_get_le16u(VAR_0);

            VAR_6 = 1;

        }

        if (VAR_5 - VAR_1 < 2)

            return AVERROR_INVALIDDATA;

        if (VAR_7 & VAR_6) {

            VAR_8 = bytestream2_get_le16(VAR_0);

            VAR_11 = (VAR_8 & 0x1FFF) << 1;

            VAR_9 = ((VAR_8 >> 13) + 2) << 1;

            if (VAR_1 - VAR_4 < VAR_11 || VAR_5 - VAR_1 < VAR_9)

                return AVERROR_INVALIDDATA;

            av_memcpy_backptr(VAR_1, VAR_11, VAR_9);

            VAR_1 += VAR_9;

        } else {

            *VAR_1++ = bytestream2_get_byte(VAR_0);

            *VAR_1++ = bytestream2_get_byte(VAR_0);

        }

        VAR_6 <<= 1;

    }



    return 0;

}

static int FUNC_0(GetByteContext *VAR_0, uint8_t *VAR_1, int VAR_2, int VAR_3)
{ const uint8_t *VAR_4 = VAR_1; const uint8_t *VAR_5   = VAR_1 + VAR_2 * VAR_3; int VAR_6 = 0x10000, VAR_7 = 0; int VAR_8, VAR_9, VAR_10; unsigned VAR_11; VAR_10 = bytestream2_get_le32(VAR_0); VAR_11   = bytestream2_get_le32(VAR_0); if (VAR_10 == 0 && VAR_11 == VAR_5 - VAR_1)
return 0; if (VAR_5 - VAR_1 <= VAR_11)
return AVERROR_INVALIDDATA; VAR_1 += VAR_11; while (VAR_10--) { if (bytestream2_get_bytes_left(VAR_0) < 2)
return AVERROR_INVALIDDATA; if (VAR_6 == 0x10000) { VAR_7 = bytestream2_get_le16u(VAR_0); VAR_6 = 1; } if (VAR_5 - VAR_1 < 2)
return AVERROR_INVALIDDATA; if (VAR_7 & VAR_6) { VAR_8 = bytestream2_get_le16(VAR_0); VAR_11 = (VAR_8 & 0x1FFF) << 1; VAR_9 = ((VAR_8 >> 13) + 2) << 1; if (VAR_1 - VAR_4 < VAR_11 || VAR_5 - VAR_1 < VAR_9)
return AVERROR_INVALIDDATA; av_memcpy_backptr(VAR_1, VAR_11, VAR_9); VAR_1 += VAR_9; } else { *VAR_1++ = bytestream2_get_byte(VAR_0); *VAR_1++ = bytestream2_get_byte(VAR_0); } VAR_6 <<= 1; } return 0; }