Exemple #1
0
static int tiff_unpack_zlib(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
                            const uint8_t *src, int size, int width, int lines,
                            int strip_start, int is_yuv)
{
    uint8_t *zbuf;
    unsigned long outlen;
    int ret, line;
    outlen = width * lines;
    zbuf   = av_malloc(outlen);
    if (!zbuf)
        return AVERROR(ENOMEM);
    if (s->fill_order) {
        if ((ret = deinvert_buffer(s, src, size)) < 0) {
            av_free(zbuf);
            return ret;
        }
        src = s->deinvert_buf;
    }
    ret = tiff_uncompress(zbuf, &outlen, src, size);
    if (ret != Z_OK) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Uncompressing failed (%lu of %lu) with error %d\n", outlen,
               (unsigned long)width * lines, ret);
        av_free(zbuf);
        return AVERROR_UNKNOWN;
    }
    src = zbuf;
    for (line = 0; line < lines; line++) {
        if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
            horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
        } else {
            memcpy(dst, src, width);
        }
        if (is_yuv) {
            unpack_yuv(s, p, dst, strip_start + line);
            line += s->subsampling[1] - 1;
        }
        dst += stride;
        src += width;
    }
    av_free(zbuf);
    return 0;
}
Exemple #2
0
static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
                             const uint8_t *src, int size, int strip_start, int lines)
{
    PutByteContext pb;
    int c, line, pixels, code, ret;
    const uint8_t *ssrc = src;
    int width = ((s->width * s->bpp) + 7) >> 3;
    int is_yuv = s->photometric == TIFF_PHOTOMETRIC_YCBCR;

    if (s->planar)
        width /= s->bppcount;

    if (size <= 0)
        return AVERROR_INVALIDDATA;

    if (is_yuv) {
        int bytes_per_row = (((s->width - 1) / s->subsampling[0] + 1) * s->bpp *
                            s->subsampling[0] * s->subsampling[1] + 7) >> 3;
        av_fast_padded_malloc(&s->yuv_line, &s->yuv_line_size, bytes_per_row);
        if (s->yuv_line == NULL) {
            av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n");
            return AVERROR(ENOMEM);
        }
        dst = s->yuv_line;
        stride = 0;
        width = s->width * s->subsampling[1] + 2*(s->width / s->subsampling[0]);
        av_assert0(width <= bytes_per_row);
        av_assert0(s->bpp == 24);
    }

    if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
        if (is_yuv) {
            av_log(s->avctx, AV_LOG_ERROR, "YUV deflate is unsupported");
            return AVERROR_PATCHWELCOME;
        }
#if CONFIG_ZLIB
        return tiff_unpack_zlib(s, dst, stride, src, size, width, lines);
#else
        av_log(s->avctx, AV_LOG_ERROR,
               "zlib support not enabled, "
               "deflate compression not supported\n");
        return AVERROR(ENOSYS);
#endif
    }
    if (s->compr == TIFF_LZW) {
        if (s->fill_order) {
            if ((ret = deinvert_buffer(s, src, size)) < 0)
                return ret;
            ssrc = src = s->deinvert_buf;
        }
        if (size > 1 && !src[0] && (src[1]&1)) {
            av_log(s->avctx, AV_LOG_ERROR, "Old style LZW is unsupported\n");
        }
        if ((ret = ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF)) < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
            return ret;
        }
        for (line = 0; line < lines; line++) {
            pixels = ff_lzw_decode(s->lzw, dst, width);
            if (pixels < width) {
                av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
                       pixels, width);
                return AVERROR_INVALIDDATA;
            }
            if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
                horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
            if (is_yuv) {
                unpack_yuv(s, p, dst, strip_start + line);
                line += s->subsampling[1] - 1;
            }
            dst += stride;
        }
        return 0;
    }
    if (s->compr == TIFF_CCITT_RLE ||
        s->compr == TIFF_G3        ||
        s->compr == TIFF_G4) {
        if (is_yuv)
            return AVERROR_INVALIDDATA;

        return tiff_unpack_fax(s, dst, stride, src, size, width, lines);
    }

    bytestream2_init(&s->gb, src, size);
    bytestream2_init_writer(&pb, dst, is_yuv ? s->yuv_line_size : (stride * lines));

    for (line = 0; line < lines; line++) {
        if (src - ssrc > size) {
            av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
            return AVERROR_INVALIDDATA;
        }

        if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))
            break;
        bytestream2_seek_p(&pb, stride * line, SEEK_SET);
        switch (s->compr) {
        case TIFF_RAW:
            if (ssrc + size - src < width)
                return AVERROR_INVALIDDATA;

            if (!s->fill_order) {
                horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                dst, 1, src, 0, width, 0);
            } else {
                int i;
                for (i = 0; i < width; i++)
                    dst[i] = ff_reverse[src[i]];
            }
            src += width;
            break;
        case TIFF_PACKBITS:
            for (pixels = 0; pixels < width;) {
                if (ssrc + size - src < 2) {
                    av_log(s->avctx, AV_LOG_ERROR, "Read went out of bounds\n");
                    return AVERROR_INVALIDDATA;
                }
                code = s->fill_order ? (int8_t) ff_reverse[*src++]: (int8_t) *src++;
                if (code >= 0) {
                    code++;
                    if (pixels + code > width ||
                        ssrc + size - src < code) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "Copy went out of bounds\n");
                        return AVERROR_INVALIDDATA;
                    }
                    horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                    dst, 1, src, 0, code, pixels);
                    src    += code;
                    pixels += code;
                } else if (code != -128) { // -127..-1
                    code = (-code) + 1;
                    if (pixels + code > width) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "Run went out of bounds\n");
                        return AVERROR_INVALIDDATA;
                    }
                    c = *src++;
                    horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
                                    dst, 0, NULL, c, code, pixels);
                    pixels += code;
                }
            }
            if (s->fill_order) {
                int i;
                for (i = 0; i < width; i++)
                    dst[i] = ff_reverse[dst[i]];
            }
            break;
        }
        if (is_yuv) {
            unpack_yuv(s, p, dst, strip_start + line);
            line += s->subsampling[1] - 1;
        }
        dst += stride;
    }
    return 0;
}