FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/vmnc.c	Lines:	254	356	71.3 %
Date:	2020-08-14 10:39:37	Branches:	125	197	63.5 %


/*
 * VMware Screen Codec (VMnc) decoder
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * VMware Screen Codec (VMnc) decoder
 * As Alex Beregszaszi discovered, this is effectively RFB data dump
 */

#include <stdio.h>
#include <stdlib.h>

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"
#include "bytestream.h"

enum EncTypes {
    MAGIC_WMVd = 0x574D5664,
    MAGIC_WMVe,
    MAGIC_WMVf,
    MAGIC_WMVg,
    MAGIC_WMVh,
    MAGIC_WMVi,
    MAGIC_WMVj
};

enum HexTile_Flags {
    HT_RAW =  1, // tile is raw
    HT_BKG =  2, // background color is present
    HT_FG  =  4, // foreground color is present
    HT_SUB =  8, // subrects are present
    HT_CLR = 16  // each subrect has own color
};

/*
 * Decoder context
 */
typedef struct VmncContext {
    AVCodecContext *avctx;
    AVFrame *pic;

    int bpp;
    int bpp2;
    int bigendian;
    uint8_t pal[768];
    int width, height;
    GetByteContext gb;

    /* cursor data */
    int cur_w, cur_h;
    int cur_x, cur_y;
    int cur_hx, cur_hy;
    uint8_t *curbits, *curmask;
    uint8_t *screendta;
} VmncContext;

/* read pixel value from stream */
static av_always_inline int vmnc_get_pixel(GetByteContext *gb, int bpp, int be)
{
    switch (bpp * 2 + be) {
    case 2:
    case 3:
        return bytestream2_get_byte(gb);
    case 4:
        return bytestream2_get_le16(gb);
    case 5:
        return bytestream2_get_be16(gb);
    case 8:
        return bytestream2_get_le32(gb);
    case 9:
        return bytestream2_get_be32(gb);
    default: return 0;
    }
}

static void load_cursor(VmncContext *c)
{
    int i, j, p;
    const int bpp   = c->bpp2;
    uint8_t *dst8   =             c->curbits;
    uint16_t *dst16 = (uint16_t *)c->curbits;
    uint32_t *dst32 = (uint32_t *)c->curbits;

    for (j = 0; j < c->cur_h; j++) {
        for (i = 0; i < c->cur_w; i++) {
            p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
            if (bpp == 1)
                *dst8++ = p;
            if (bpp == 2)
                *dst16++ = p;
            if (bpp == 4)
                *dst32++ = p;
        }
    }
    dst8  =            c->curmask;
    dst16 = (uint16_t*)c->curmask;
    dst32 = (uint32_t*)c->curmask;
    for (j = 0; j < c->cur_h; j++) {
        for (i = 0; i < c->cur_w; i++) {
            p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
            if (bpp == 1)
                *dst8++ = p;
            if (bpp == 2)
                *dst16++ = p;
            if (bpp == 4)
                *dst32++ = p;
        }
    }
}

static void put_cursor(uint8_t *dst, int stride, VmncContext *c, int dx, int dy)
{
    int i, j;
    int w, h, x, y;
    w = c->cur_w;
    if (c->width < c->cur_x + c->cur_w)
        w = c->width - c->cur_x;
    h = c->cur_h;
    if (c->height < c->cur_y + c->cur_h)
        h = c->height - c->cur_y;
    x = c->cur_x;
    y = c->cur_y;
    if (x < 0) {
        w += x;
        x  = 0;
    }
    if (y < 0) {
        h += y;
        y  = 0;
    }

    if ((w < 1) || (h < 1))
        return;
    dst += x * c->bpp2 + y * stride;

    if (c->bpp2 == 1) {
        uint8_t *cd = c->curbits, *msk = c->curmask;
        for (j = 0; j < h; j++) {
            for (i = 0; i < w; i++)
                dst[i] = (dst[i] & cd[i]) ^ msk[i];
            msk += c->cur_w;
            cd  += c->cur_w;
            dst += stride;
        }
    } else if (c->bpp2 == 2) {
        uint16_t *cd = (uint16_t*)c->curbits, *msk = (uint16_t*)c->curmask;
        uint16_t *dst2;
        for (j = 0; j < h; j++) {
            dst2 = (uint16_t*)dst;
            for (i = 0; i < w; i++)
                dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
            msk += c->cur_w;
            cd  += c->cur_w;
            dst += stride;
        }
    } else if (c->bpp2 == 4) {
        uint32_t *cd = (uint32_t*)c->curbits, *msk = (uint32_t*)c->curmask;
        uint32_t *dst2;
        for (j = 0; j < h; j++) {
            dst2 = (uint32_t*)dst;
            for (i = 0; i < w; i++)
                dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
            msk += c->cur_w;
            cd  += c->cur_w;
            dst += stride;
        }
    }
}

/* fill rectangle with given color */
static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy,
                                        int w, int h, int color,
                                        int bpp, int stride)
{
    int i, j;
    dst += dx * bpp + dy * stride;
    if (bpp == 1) {
        for (j = 0; j < h; j++) {
            memset(dst, color, w);
            dst += stride;
        }
    } else if (bpp == 2) {
        uint16_t *dst2;
        for (j = 0; j < h; j++) {
            dst2 = (uint16_t*)dst;
            for (i = 0; i < w; i++)
                *dst2++ = color;
            dst += stride;
        }
    } else if (bpp == 4) {
        uint32_t *dst2;
        for (j = 0; j < h; j++) {
            dst2 = (uint32_t*)dst;
            for (i = 0; i < w; i++)
                dst2[i] = color;
            dst += stride;
        }
    }
}

static av_always_inline void paint_raw(uint8_t *dst, int w, int h,
                                       GetByteContext *gb, int bpp,
                                       int be, int stride)
{
    int i, j, p;
    for (j = 0; j < h; j++) {
        for (i = 0; i < w; i++) {
            p = vmnc_get_pixel(gb, bpp, be);
            switch (bpp) {
            case 1:
                dst[i] = p;
                break;
            case 2:
                ((uint16_t*)dst)[i] = p;
                break;
            case 4:
                ((uint32_t*)dst)[i] = p;
                break;
            }
        }
        dst += stride;
    }
}

static int decode_hextile(VmncContext *c, uint8_t* dst, GetByteContext *gb,
                          int w, int h, int stride)
{
    int i, j, k;
    int bg = 0, fg = 0, rects, color, flags, xy, wh;
    const int bpp = c->bpp2;
    uint8_t *dst2;
    int bw = 16, bh = 16;

    for (j = 0; j < h; j += 16) {
        dst2 = dst;
        bw   = 16;
        if (j + 16 > h)
            bh = h - j;
        for (i = 0; i < w; i += 16, dst2 += 16 * bpp) {
            if (bytestream2_get_bytes_left(gb) <= 0) {
                av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
                return AVERROR_INVALIDDATA;
            }
            if (i + 16 > w)
                bw = w - i;
            flags = bytestream2_get_byte(gb);
            if (flags & HT_RAW) {
                if (bytestream2_get_bytes_left(gb) < bw * bh * bpp) {
                    av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
                    return AVERROR_INVALIDDATA;
                }
                paint_raw(dst2, bw, bh, gb, bpp, c->bigendian, stride);
            } else {
                if (flags & HT_BKG)
                    bg = vmnc_get_pixel(gb, bpp, c->bigendian);
                if (flags & HT_FG)
                    fg = vmnc_get_pixel(gb, bpp, c->bigendian);
                rects = 0;
                if (flags & HT_SUB)
                    rects = bytestream2_get_byte(gb);
                color = !!(flags & HT_CLR);

                paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);

                if (bytestream2_get_bytes_left(gb) < rects * (color * bpp + 2)) {
                    av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
                    return AVERROR_INVALIDDATA;
                }
                for (k = 0; k < rects; k++) {
                    int rect_x, rect_y, rect_w, rect_h;
                    if (color)
                        fg = vmnc_get_pixel(gb, bpp, c->bigendian);
                    xy = bytestream2_get_byte(gb);
                    wh = bytestream2_get_byte(gb);

                    rect_x = xy >> 4;
                    rect_y = xy & 0xF;
                    rect_w = (wh >> 4) + 1;
                    rect_h = (wh & 0xF) + 1;

                    if (rect_x + rect_w > w - i || rect_y + rect_h > h - j) {
                        av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n");
                        return AVERROR_INVALIDDATA;
                    }

                    paint_rect(dst2, rect_x, rect_y,
                               rect_w, rect_h, fg, bpp, stride);
                }
            }
        }
        dst += stride * 16;
    }
    return 0;
}

static void reset_buffers(VmncContext *c)
{
    av_freep(&c->curbits);
    av_freep(&c->curmask);
    av_freep(&c->screendta);
    c->cur_w = c->cur_h = 0;
    c->cur_hx = c->cur_hy = 0;

}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    VmncContext * const c = avctx->priv_data;
    GetByteContext *gb = &c->gb;
    uint8_t *outptr;
    int dx, dy, w, h, depth, enc, chunks, res, size_left, ret;

    bytestream2_init(gb, buf, buf_size);
    bytestream2_skip(gb, 2);
    chunks = bytestream2_get_be16(gb);
    if (12LL * chunks > bytestream2_get_bytes_left(gb))
        return AVERROR_INVALIDDATA;

    if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
        return ret;

    c->pic->key_frame = 0;
    c->pic->pict_type = AV_PICTURE_TYPE_P;

    // restore screen after cursor
    if (c->screendta) {
        int i;
        w = c->cur_w;
        if (c->width < c->cur_x + w)
            w = c->width - c->cur_x;
        h = c->cur_h;
        if (c->height < c->cur_y + h)
            h = c->height - c->cur_y;
        dx = c->cur_x;
        if (dx < 0) {
            w += dx;
            dx = 0;
        }
        dy = c->cur_y;
        if (dy < 0) {
            h += dy;
            dy = 0;
        }
        if ((w > 0) && (h > 0)) {
            outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
            for (i = 0; i < h; i++) {
                memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2,
                       w * c->bpp2);
                outptr += c->pic->linesize[0];
            }
        }
    }

    while (chunks--) {
        if (bytestream2_get_bytes_left(gb) < 12) {
            av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n");
            return -1;
        }
        dx  = bytestream2_get_be16(gb);
        dy  = bytestream2_get_be16(gb);
        w   = bytestream2_get_be16(gb);
        h   = bytestream2_get_be16(gb);
        enc = bytestream2_get_be32(gb);
        if ((dx + w > c->width) || (dy + h > c->height)) {
            av_log(avctx, AV_LOG_ERROR,
                    "Incorrect frame size: %ix%i+%ix%i of %ix%i\n",
                    w, h, dx, dy, c->width, c->height);
            return AVERROR_INVALIDDATA;
        }
        outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
        size_left = bytestream2_get_bytes_left(gb);
        switch (enc) {
        case MAGIC_WMVd: // cursor
            if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) {
                av_log(avctx, AV_LOG_ERROR, "dimensions too large\n");
                return AVERROR_INVALIDDATA;
            }
            if (size_left < 2 + w * h * c->bpp2 * 2) {
                av_log(avctx, AV_LOG_ERROR,
                       "Premature end of data! (need %i got %i)\n",
                       2 + w * h * c->bpp2 * 2, size_left);
                return AVERROR_INVALIDDATA;
            }
            bytestream2_skip(gb, 2);
            c->cur_w  = w;
            c->cur_h  = h;
            c->cur_hx = dx;
            c->cur_hy = dy;
            if ((c->cur_hx > c->cur_w) || (c->cur_hy > c->cur_h)) {
                av_log(avctx, AV_LOG_ERROR,
                       "Cursor hot spot is not in image: "
                       "%ix%i of %ix%i cursor size\n",
                       c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
                c->cur_hx = c->cur_hy = 0;
            }
            if (c->cur_w * c->cur_h >= INT_MAX / c->bpp2) {
                reset_buffers(c);
                return AVERROR(EINVAL);
            } else {
                int screen_size = c->cur_w * c->cur_h * c->bpp2;
                if ((ret = av_reallocp(&c->curbits, screen_size)) < 0 ||
                    (ret = av_reallocp(&c->curmask, screen_size)) < 0 ||
                    (ret = av_reallocp(&c->screendta, screen_size)) < 0) {
                    reset_buffers(c);
                    return ret;
                }
            }
            load_cursor(c);
            break;
        case MAGIC_WMVe: // unknown
            bytestream2_skip(gb, 2);
            break;
        case MAGIC_WMVf: // update cursor position
            c->cur_x = dx - c->cur_hx;
            c->cur_y = dy - c->cur_hy;
            break;
        case MAGIC_WMVg: // unknown
            bytestream2_skip(gb, 10);
            break;
        case MAGIC_WMVh: // unknown
            bytestream2_skip(gb, 4);
            break;
        case MAGIC_WMVi: // ServerInitialization struct
            c->pic->key_frame = 1;
            c->pic->pict_type = AV_PICTURE_TYPE_I;
            depth = bytestream2_get_byte(gb);
            if (depth != c->bpp) {
                av_log(avctx, AV_LOG_INFO,
                       "Depth mismatch. Container %i bpp, "
                       "Frame data: %i bpp\n",
                       c->bpp, depth);
            }
            bytestream2_skip(gb, 1);
            c->bigendian = bytestream2_get_byte(gb);
            if (c->bigendian & (~1)) {
                av_log(avctx, AV_LOG_INFO,
                       "Invalid header: bigendian flag = %i\n", c->bigendian);
                return AVERROR_INVALIDDATA;
            }
            //skip the rest of pixel format data
            bytestream2_skip(gb, 13);
            break;
        case MAGIC_WMVj: // unknown
            bytestream2_skip(gb, 2);
            break;
        case 0x00000000: // raw rectangle data
            if (size_left < w * h * c->bpp2) {
                av_log(avctx, AV_LOG_ERROR,
                       "Premature end of data! (need %i got %i)\n",
                       w * h * c->bpp2, size_left);
                return AVERROR_INVALIDDATA;
            }
            paint_raw(outptr, w, h, gb, c->bpp2, c->bigendian,
                      c->pic->linesize[0]);
            break;
        case 0x00000005: // HexTile encoded rectangle
            res = decode_hextile(c, outptr, gb, w, h, c->pic->linesize[0]);
            if (res < 0)
                return res;
            break;
        default:
            av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
            chunks = 0; // leave chunks decoding loop
        }
    }
    if (c->screendta) {
        int i;
        // save screen data before painting cursor
        w = c->cur_w;
        if (c->width < c->cur_x + w)
            w = c->width - c->cur_x;
        h = c->cur_h;
        if (c->height < c->cur_y + h)
            h = c->height - c->cur_y;
        dx = c->cur_x;
        if (dx < 0) {
            w += dx;
            dx = 0;
        }
        dy = c->cur_y;
        if (dy < 0) {
            h += dy;
            dy = 0;
        }
        if ((w > 0) && (h > 0)) {
            outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
            for (i = 0; i < h; i++) {
                memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr,
                       w * c->bpp2);
                outptr += c->pic->linesize[0];
            }
            outptr = c->pic->data[0];
            put_cursor(outptr, c->pic->linesize[0], c, c->cur_x, c->cur_y);
        }
    }
    *got_frame = 1;
    if ((ret = av_frame_ref(data, c->pic)) < 0)
        return ret;

    /* always report that the buffer was completely consumed */
    return buf_size;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    VmncContext * const c = avctx->priv_data;

    c->avctx  = avctx;
    c->width  = avctx->width;
    c->height = avctx->height;
    c->bpp    = avctx->bits_per_coded_sample;

    switch (c->bpp) {
    case 8:
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
        break;
    case 16:
        avctx->pix_fmt = AV_PIX_FMT_RGB555;
        break;
    case 24:
        /* 24 bits is not technically supported, but some clients might
         * mistakenly set it, so let's assume they actually meant 32 bits */
        c->bpp = 32;
    case 32:
        avctx->pix_fmt = AV_PIX_FMT_0RGB32;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
        return AVERROR_INVALIDDATA;
    }
    c->bpp2 = c->bpp / 8;

    c->pic = av_frame_alloc();
    if (!c->pic)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    VmncContext * const c = avctx->priv_data;

    av_frame_free(&c->pic);

    av_freep(&c->curbits);
    av_freep(&c->curmask);
    av_freep(&c->screendta);
    return 0;
}

AVCodec ff_vmnc_decoder = {
    .name           = "vmnc",
    .long_name      = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_VMNC,
    .priv_data_size = sizeof(VmncContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* VMware Screen Codec (VMnc) decoder
3			* Copyright (c) 2006 Konstantin Shishkov
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* VMware Screen Codec (VMnc) decoder
25			* As Alex Beregszaszi discovered, this is effectively RFB data dump
26			*/
27
28			#include <stdio.h>
29			#include <stdlib.h>
30
31			#include "libavutil/common.h"
32			#include "libavutil/intreadwrite.h"
33			#include "avcodec.h"
34			#include "internal.h"
35			#include "bytestream.h"
36
37			enum EncTypes {
38			MAGIC_WMVd = 0x574D5664,
39			MAGIC_WMVe,
40			MAGIC_WMVf,
41			MAGIC_WMVg,
42			MAGIC_WMVh,
43			MAGIC_WMVi,
44			MAGIC_WMVj
45			};
46
47			enum HexTile_Flags {
48			HT_RAW = 1, // tile is raw
49			HT_BKG = 2, // background color is present
50			HT_FG = 4, // foreground color is present
51			HT_SUB = 8, // subrects are present
52			HT_CLR = 16 // each subrect has own color
53			};
54
55			/*
56			* Decoder context
57			*/
58			typedef struct VmncContext {
59			AVCodecContext *avctx;
60			AVFrame *pic;
61
62			int bpp;
63			int bpp2;
64			int bigendian;
65			uint8_t pal[768];
66			int width, height;
67			GetByteContext gb;
68
69			/* cursor data */
70			int cur_w, cur_h;
71			int cur_x, cur_y;
72			int cur_hx, cur_hy;
73			uint8_t curbits, curmask;
74			uint8_t *screendta;
75			} VmncContext;
76
77			/* read pixel value from stream */
78		401741	static av_always_inline int vmnc_get_pixel(GetByteContext *gb, int bpp, int be)
79			{
80	✗✓✗✓ ✗✗	401741	switch (bpp * 2 + be) {
81			case 2:
82			case 3:
83			return bytestream2_get_byte(gb);
84		58268	case 4:
85		58268	return bytestream2_get_le16(gb);
86			case 5:
87			return bytestream2_get_be16(gb);
88		343473	case 8:
89		343473	return bytestream2_get_le32(gb);
90			case 9:
91			return bytestream2_get_be32(gb);
92			default: return 0;
93			}
94			}
95
96		16	static void load_cursor(VmncContext *c)
97			{
98			int i, j, p;
99		16	const int bpp = c->bpp2;
100		16	uint8_t *dst8 = c->curbits;
101		16	uint16_t dst16 = (uint16_t )c->curbits;
102		16	uint32_t dst32 = (uint32_t )c->curbits;
103
104	✓✓	432	for (j = 0; j < c->cur_h; j++) {
105	✓✓	13728	for (i = 0; i < c->cur_w; i++) {
106		13312	p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
107	✗✓	13312	if (bpp == 1)
108			*dst8++ = p;
109	✗✓	13312	if (bpp == 2)
110			*dst16++ = p;
111	✓✗	13312	if (bpp == 4)
112		13312	*dst32++ = p;
113			}
114			}
115		16	dst8 = c->curmask;
116		16	dst16 = (uint16_t*)c->curmask;
117		16	dst32 = (uint32_t*)c->curmask;
118	✓✓	432	for (j = 0; j < c->cur_h; j++) {
119	✓✓	13728	for (i = 0; i < c->cur_w; i++) {
120		13312	p = vmnc_get_pixel(&c->gb, bpp, c->bigendian);
121	✗✓	13312	if (bpp == 1)
122			*dst8++ = p;
123	✗✓	13312	if (bpp == 2)
124			*dst16++ = p;
125	✓✗	13312	if (bpp == 4)
126		13312	*dst32++ = p;
127			}
128			}
129		16	}
130
131		49	static void put_cursor(uint8_t dst, int stride, VmncContext c, int dx, int dy)
132			{
133			int i, j;
134			int w, h, x, y;
135		49	w = c->cur_w;
136	✗✓	49	if (c->width < c->cur_x + c->cur_w)
137			w = c->width - c->cur_x;
138		49	h = c->cur_h;
139	✗✓	49	if (c->height < c->cur_y + c->cur_h)
140			h = c->height - c->cur_y;
141		49	x = c->cur_x;
142		49	y = c->cur_y;
143	✗✓	49	if (x < 0) {
144			w += x;
145			x = 0;
146			}
147	✗✓	49	if (y < 0) {
148			h += y;
149			y = 0;
150			}
151
152	✓✗✗✓	49	if ((w < 1) \|\| (h < 1))
153			return;
154		49	dst += x * c->bpp2 + y * stride;
155
156	✗✓	49	if (c->bpp2 == 1) {
157			uint8_t cd = c->curbits, msk = c->curmask;
158			for (j = 0; j < h; j++) {
159			for (i = 0; i < w; i++)
160			dst[i] = (dst[i] & cd[i]) ^ msk[i];
161			msk += c->cur_w;
162			cd += c->cur_w;
163			dst += stride;
164			}
165	✗✓	49	} else if (c->bpp2 == 2) {
166			uint16_t cd = (uint16_t)c->curbits, msk = (uint16_t)c->curmask;
167			uint16_t *dst2;
168			for (j = 0; j < h; j++) {
169			dst2 = (uint16_t*)dst;
170			for (i = 0; i < w; i++)
171			dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
172			msk += c->cur_w;
173			cd += c->cur_w;
174			dst += stride;
175			}
176	✓✗	49	} else if (c->bpp2 == 4) {
177		49	uint32_t cd = (uint32_t)c->curbits, msk = (uint32_t)c->curmask;
178			uint32_t *dst2;
179	✓✓	1617	for (j = 0; j < h; j++) {
180		1568	dst2 = (uint32_t*)dst;
181	✓✓	51744	for (i = 0; i < w; i++)
182		50176	dst2[i] = (dst2[i] & cd[i]) ^ msk[i];
183		1568	msk += c->cur_w;
184		1568	cd += c->cur_w;
185		1568	dst += stride;
186			}
187			}
188			}
189
190			/* fill rectangle with given color */
191		443805	static av_always_inline void paint_rect(uint8_t *dst, int dx, int dy,
192			int w, int h, int color,
193			int bpp, int stride)
194			{
195			int i, j;
196		443805	dst += dx * bpp + dy * stride;
197	✗✓	443805	if (bpp == 1) {
198			for (j = 0; j < h; j++) {
199			memset(dst, color, w);
200			dst += stride;
201			}
202	✓✓	443805	} else if (bpp == 2) {
203			uint16_t *dst2;
204	✓✓	779284	for (j = 0; j < h; j++) {
205		687588	dst2 = (uint16_t*)dst;
206	✓✓	9596125	for (i = 0; i < w; i++)
207		8908537	*dst2++ = color;
208		687588	dst += stride;
209			}
210	✓✗	352109	} else if (bpp == 4) {
211			uint32_t *dst2;
212	✓✓	1672564	for (j = 0; j < h; j++) {
213		1320455	dst2 = (uint32_t*)dst;
214	✓✓	14028614	for (i = 0; i < w; i++)
215		12708159	dst2[i] = color;
216		1320455	dst += stride;
217			}
218			}
219		443805	}
220
221		50	static av_always_inline void paint_raw(uint8_t *dst, int w, int h,
222			GetByteContext *gb, int bpp,
223			int be, int stride)
224			{
225			int i, j, p;
226	✓✓	467	for (j = 0; j < h; j++) {
227	✓✓	6621	for (i = 0; i < w; i++) {
228		6204	p = vmnc_get_pixel(gb, bpp, be);
229	✗✗✓✗	6204	switch (bpp) {
230			case 1:
231			dst[i] = p;
232			break;
233			case 2:
234			((uint16_t*)dst)[i] = p;
235			break;
236		6204	case 4:
237		6204	((uint32_t*)dst)[i] = p;
238		6204	break;
239			}
240		6204	}
241		417	dst += stride;
242			}
243		50	}
244
245		463	static int decode_hextile(VmncContext c, uint8_t dst, GetByteContext *gb,
246			int w, int h, int stride)
247			{
248			int i, j, k;
249		463	int bg = 0, fg = 0, rects, color, flags, xy, wh;
250		463	const int bpp = c->bpp2;
251			uint8_t *dst2;
252		463	int bw = 16, bh = 16;
253
254	✓✓	2709	for (j = 0; j < h; j += 16) {
255		2247	dst2 = dst;
256		2247	bw = 16;
257	✓✓	2247	if (j + 16 > h)
258		420	bh = h - j;
259	✓✓	78438	for (i = 0; i < w; i += 16, dst2 += 16 * bpp) {
260	✗✓	76192	if (bytestream2_get_bytes_left(gb) <= 0) {
261			av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
262			return AVERROR_INVALIDDATA;
263			}
264	✓✓	76192	if (i + 16 > w)
265		2103	bw = w - i;
266		76192	flags = bytestream2_get_byte(gb);
267	✓✓	76192	if (flags & HT_RAW) {
268	✗✓	42	if (bytestream2_get_bytes_left(gb) < bw * bh * bpp) {
269			av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
270			return AVERROR_INVALIDDATA;
271			}
272		42	paint_raw(dst2, bw, bh, gb, bpp, c->bigendian, stride);
273			} else {
274	✓✓	76150	if (flags & HT_BKG)
275		1377	bg = vmnc_get_pixel(gb, bpp, c->bigendian);
276	✓✓	76150	if (flags & HT_FG)
277		1494	fg = vmnc_get_pixel(gb, bpp, c->bigendian);
278		76150	rects = 0;
279	✓✓	76150	if (flags & HT_SUB)
280		30064	rects = bytestream2_get_byte(gb);
281		76150	color = !!(flags & HT_CLR);
282
283		76150	paint_rect(dst2, 0, 0, bw, bh, bg, bpp, stride);
284
285	✓✓	76150	if (bytestream2_get_bytes_left(gb) < rects * (color * bpp + 2)) {
286		1	av_log(c->avctx, AV_LOG_ERROR, "Premature end of data!\n");
287		1	return AVERROR_INVALIDDATA;
288			}
289	✓✓	443804	for (k = 0; k < rects; k++) {
290			int rect_x, rect_y, rect_w, rect_h;
291	✓✓	367655	if (color)
292		366042	fg = vmnc_get_pixel(gb, bpp, c->bigendian);
293		367655	xy = bytestream2_get_byte(gb);
294		367655	wh = bytestream2_get_byte(gb);
295
296		367655	rect_x = xy >> 4;
297		367655	rect_y = xy & 0xF;
298		367655	rect_w = (wh >> 4) + 1;
299		367655	rect_h = (wh & 0xF) + 1;
300
301	✓✗✗✓	367655	if (rect_x + rect_w > w - i \|\| rect_y + rect_h > h - j) {
302			av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n");
303			return AVERROR_INVALIDDATA;
304			}
305
306		367655	paint_rect(dst2, rect_x, rect_y,
307			rect_w, rect_h, fg, bpp, stride);
308			}
309			}
310			}
311		2246	dst += stride * 16;
312			}
313		462	return 0;
314			}
315
316			static void reset_buffers(VmncContext *c)
317			{
318			av_freep(&c->curbits);
319			av_freep(&c->curmask);
320			av_freep(&c->screendta);
321			c->cur_w = c->cur_h = 0;
322			c->cur_hx = c->cur_hy = 0;
323
324			}
325
326		242	static int decode_frame(AVCodecContext avctx, void data, int *got_frame,
327			AVPacket *avpkt)
328			{
329		242	const uint8_t *buf = avpkt->data;
330		242	int buf_size = avpkt->size;
331		242	VmncContext * const c = avctx->priv_data;
332		242	GetByteContext *gb = &c->gb;
333			uint8_t *outptr;
334			int dx, dy, w, h, depth, enc, chunks, res, size_left, ret;
335
336		242	bytestream2_init(gb, buf, buf_size);
337		242	bytestream2_skip(gb, 2);
338		242	chunks = bytestream2_get_be16(gb);
339	✗✓	242	if (12LL * chunks > bytestream2_get_bytes_left(gb))
340			return AVERROR_INVALIDDATA;
341
342	✗✓	242	if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
343			return ret;
344
345		242	c->pic->key_frame = 0;
346		242	c->pic->pict_type = AV_PICTURE_TYPE_P;
347
348			// restore screen after cursor
349	✓✓	242	if (c->screendta) {
350			int i;
351		49	w = c->cur_w;
352	✗✓	49	if (c->width < c->cur_x + w)
353			w = c->width - c->cur_x;
354		49	h = c->cur_h;
355	✗✓	49	if (c->height < c->cur_y + h)
356			h = c->height - c->cur_y;
357		49	dx = c->cur_x;
358	✗✓	49	if (dx < 0) {
359			w += dx;
360			dx = 0;
361			}
362		49	dy = c->cur_y;
363	✗✓	49	if (dy < 0) {
364			h += dy;
365			dy = 0;
366			}
367	✓✗✓✗	49	if ((w > 0) && (h > 0)) {
368		49	outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
369	✓✓	1617	for (i = 0; i < h; i++) {
370		1568	memcpy(outptr, c->screendta + i * c->cur_w * c->bpp2,
371		1568	w * c->bpp2);
372		1568	outptr += c->pic->linesize[0];
373			}
374			}
375			}
376
377	✓✓	808	while (chunks--) {
378	✗✓	567	if (bytestream2_get_bytes_left(gb) < 12) {
379			av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n");
380			return -1;
381			}
382		567	dx = bytestream2_get_be16(gb);
383		567	dy = bytestream2_get_be16(gb);
384		567	w = bytestream2_get_be16(gb);
385		567	h = bytestream2_get_be16(gb);
386		567	enc = bytestream2_get_be32(gb);
387	✓✗✗✓	567	if ((dx + w > c->width) \|\| (dy + h > c->height)) {
388			av_log(avctx, AV_LOG_ERROR,
389			"Incorrect frame size: %ix%i+%ix%i of %ix%i\n",
390			w, h, dx, dy, c->width, c->height);
391			return AVERROR_INVALIDDATA;
392			}
393		567	outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
394		567	size_left = bytestream2_get_bytes_left(gb);
395	✓✓✓✓ ✓✓✓✓ ✓✗	567	switch (enc) {
396		16	case MAGIC_WMVd: // cursor
397	✗✓	16	if (w(int64_t)hc->bpp2 > INT_MAX/2 - 2) {
398			av_log(avctx, AV_LOG_ERROR, "dimensions too large\n");
399			return AVERROR_INVALIDDATA;
400			}
401	✗✓	16	if (size_left < 2 + w * h * c->bpp2 * 2) {
402			av_log(avctx, AV_LOG_ERROR,
403			"Premature end of data! (need %i got %i)\n",
404			2 + w * h * c->bpp2 * 2, size_left);
405			return AVERROR_INVALIDDATA;
406			}
407		16	bytestream2_skip(gb, 2);
408		16	c->cur_w = w;
409		16	c->cur_h = h;
410		16	c->cur_hx = dx;
411		16	c->cur_hy = dy;
412	✓✗✗✓	16	if ((c->cur_hx > c->cur_w) \|\| (c->cur_hy > c->cur_h)) {
413			av_log(avctx, AV_LOG_ERROR,
414			"Cursor hot spot is not in image: "
415			"%ix%i of %ix%i cursor size\n",
416			c->cur_hx, c->cur_hy, c->cur_w, c->cur_h);
417			c->cur_hx = c->cur_hy = 0;
418			}
419	✗✓	16	if (c->cur_w * c->cur_h >= INT_MAX / c->bpp2) {
420			reset_buffers(c);
421			return AVERROR(EINVAL);
422			} else {
423		16	int screen_size = c->cur_w * c->cur_h * c->bpp2;
424	✓✗✓✗	32	if ((ret = av_reallocp(&c->curbits, screen_size)) < 0 \|\|
425	✗✓	32	(ret = av_reallocp(&c->curmask, screen_size)) < 0 \|\|
426		16	(ret = av_reallocp(&c->screendta, screen_size)) < 0) {
427			reset_buffers(c);
428			return ret;
429			}
430			}
431		16	load_cursor(c);
432		16	break;
433		35	case MAGIC_WMVe: // unknown
434		35	bytestream2_skip(gb, 2);
435		35	break;
436		29	case MAGIC_WMVf: // update cursor position
437		29	c->cur_x = dx - c->cur_hx;
438		29	c->cur_y = dy - c->cur_hy;
439		29	break;
440		4	case MAGIC_WMVg: // unknown
441		4	bytestream2_skip(gb, 10);
442		4	break;
443		4	case MAGIC_WMVh: // unknown
444		4	bytestream2_skip(gb, 4);
445		4	break;
446		4	case MAGIC_WMVi: // ServerInitialization struct
447		4	c->pic->key_frame = 1;
448		4	c->pic->pict_type = AV_PICTURE_TYPE_I;
449		4	depth = bytestream2_get_byte(gb);
450	✗✓	4	if (depth != c->bpp) {
451			av_log(avctx, AV_LOG_INFO,
452			"Depth mismatch. Container %i bpp, "
453			"Frame data: %i bpp\n",
454			c->bpp, depth);
455			}
456		4	bytestream2_skip(gb, 1);
457		4	c->bigendian = bytestream2_get_byte(gb);
458	✗✓	4	if (c->bigendian & (~1)) {
459			av_log(avctx, AV_LOG_INFO,
460			"Invalid header: bigendian flag = %i\n", c->bigendian);
461			return AVERROR_INVALIDDATA;
462			}
463			//skip the rest of pixel format data
464		4	bytestream2_skip(gb, 13);
465		4	break;
466		4	case MAGIC_WMVj: // unknown
467		4	bytestream2_skip(gb, 2);
468		4	break;
469		8	case 0x00000000: // raw rectangle data
470	✗✓	8	if (size_left < w * h * c->bpp2) {
471			av_log(avctx, AV_LOG_ERROR,
472			"Premature end of data! (need %i got %i)\n",
473			w * h * c->bpp2, size_left);
474			return AVERROR_INVALIDDATA;
475			}
476		8	paint_raw(outptr, w, h, gb, c->bpp2, c->bigendian,
477		8	c->pic->linesize[0]);
478		8	break;
479		463	case 0x00000005: // HexTile encoded rectangle
480		463	res = decode_hextile(c, outptr, gb, w, h, c->pic->linesize[0]);
481	✓✓	463	if (res < 0)
482		1	return res;
483		462	break;
484			default:
485			av_log(avctx, AV_LOG_ERROR, "Unsupported block type 0x%08X\n", enc);
486			chunks = 0; // leave chunks decoding loop
487			}
488			}
489	✓✓	241	if (c->screendta) {
490			int i;
491			// save screen data before painting cursor
492		49	w = c->cur_w;
493	✗✓	49	if (c->width < c->cur_x + w)
494			w = c->width - c->cur_x;
495		49	h = c->cur_h;
496	✗✓	49	if (c->height < c->cur_y + h)
497			h = c->height - c->cur_y;
498		49	dx = c->cur_x;
499	✗✓	49	if (dx < 0) {
500			w += dx;
501			dx = 0;
502			}
503		49	dy = c->cur_y;
504	✗✓	49	if (dy < 0) {
505			h += dy;
506			dy = 0;
507			}
508	✓✗✓✗	49	if ((w > 0) && (h > 0)) {
509		49	outptr = c->pic->data[0] + dx * c->bpp2 + dy * c->pic->linesize[0];
510	✓✓	1617	for (i = 0; i < h; i++) {
511		1568	memcpy(c->screendta + i * c->cur_w * c->bpp2, outptr,
512		1568	w * c->bpp2);
513		1568	outptr += c->pic->linesize[0];
514			}
515		49	outptr = c->pic->data[0];
516		49	put_cursor(outptr, c->pic->linesize[0], c, c->cur_x, c->cur_y);
517			}
518			}
519		241	*got_frame = 1;
520	✗✓	241	if ((ret = av_frame_ref(data, c->pic)) < 0)
521			return ret;
522
523			/* always report that the buffer was completely consumed */
524		241	return buf_size;
525			}
526
527		4	static av_cold int decode_init(AVCodecContext *avctx)
528			{
529		4	VmncContext * const c = avctx->priv_data;
530
531		4	c->avctx = avctx;
532		4	c->width = avctx->width;
533		4	c->height = avctx->height;
534		4	c->bpp = avctx->bits_per_coded_sample;
535
536	✗✓✗✓ ✗	4	switch (c->bpp) {
537			case 8:
538			avctx->pix_fmt = AV_PIX_FMT_PAL8;
539			break;
540		2	case 16:
541		2	avctx->pix_fmt = AV_PIX_FMT_RGB555;
542		2	break;
543			case 24:
544			/* 24 bits is not technically supported, but some clients might
545			* mistakenly set it, so let's assume they actually meant 32 bits */
546			c->bpp = 32;
547		2	case 32:
548		2	avctx->pix_fmt = AV_PIX_FMT_0RGB32;
549		2	break;
550			default:
551			av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp);
552			return AVERROR_INVALIDDATA;
553			}
554		4	c->bpp2 = c->bpp / 8;
555
556		4	c->pic = av_frame_alloc();
557	✗✓	4	if (!c->pic)
558			return AVERROR(ENOMEM);
559
560		4	return 0;
561			}
562
563		4	static av_cold int decode_end(AVCodecContext *avctx)
564			{
565		4	VmncContext * const c = avctx->priv_data;
566
567		4	av_frame_free(&c->pic);
568
569		4	av_freep(&c->curbits);
570		4	av_freep(&c->curmask);
571		4	av_freep(&c->screendta);
572		4	return 0;
573			}
574
575			AVCodec ff_vmnc_decoder = {
576			.name = "vmnc",
577			.long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
578			.type = AVMEDIA_TYPE_VIDEO,
579			.id = AV_CODEC_ID_VMNC,
580			.priv_data_size = sizeof(VmncContext),
581			.init = decode_init,
582			.close = decode_end,
583			.decode = decode_frame,
584			.capabilities = AV_CODEC_CAP_DR1,
585			};