GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pcx.c Lines: 63 136 46.3 %
Date: 2019-11-18 18:00:01 Branches: 33 99 33.3 %

Line Branch Exec Source
1
/*
2
 * PC Paintbrush PCX (.pcx) image decoder
3
 * Copyright (c) 2007, 2008 Ivo van Poorten
4
 *
5
 * This decoder does not support CGA palettes. I am unable to find samples
6
 * and Netpbm cannot generate them.
7
 *
8
 * This file is part of FFmpeg.
9
 *
10
 * FFmpeg is free software; you can redistribute it and/or
11
 * modify it under the terms of the GNU Lesser General Public
12
 * License as published by the Free Software Foundation; either
13
 * version 2.1 of the License, or (at your option) any later version.
14
 *
15
 * FFmpeg is distributed in the hope that it will be useful,
16
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18
 * Lesser General Public License for more details.
19
 *
20
 * You should have received a copy of the GNU Lesser General Public
21
 * License along with FFmpeg; if not, write to the Free Software
22
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23
 */
24
25
#include "libavutil/imgutils.h"
26
#include "avcodec.h"
27
#include "bytestream.h"
28
#include "get_bits.h"
29
#include "internal.h"
30
31
#define PCX_HEADER_SIZE 128
32
33
4320
static int pcx_rle_decode(GetByteContext *gb,
34
                           uint8_t *dst,
35
                           unsigned int bytes_per_scanline,
36
                           int compressed)
37
{
38
4320
    unsigned int i = 0;
39
    unsigned char run, value;
40
41
4320
    if (bytestream2_get_bytes_left(gb) < 1)
42
        return AVERROR_INVALIDDATA;
43
44
4320
    if (compressed) {
45

4330025
        while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) {
46
4325705
            run   = 1;
47
4325705
            value = bytestream2_get_byte(gb);
48

4325705
            if (value >= 0xc0 && bytestream2_get_bytes_left(gb)>0) {
49
1136991
                run   = value & 0x3f;
50
1136991
                value = bytestream2_get_byte(gb);
51
            }
52

8887625
            while (i < bytes_per_scanline && run--)
53
4561920
                dst[i++] = value;
54
        }
55
    } else {
56
        bytestream2_get_buffer(gb, dst, bytes_per_scanline);
57
    }
58
4320
    return 0;
59
}
60
61
static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen)
62
{
63
    int i;
64
65
    pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3);
66
    for (i = 0; i < pallen; i++)
67
        *dst++ = 0xFF000000 | bytestream2_get_be24u(gb);
68
    if (pallen < 256)
69
        memset(dst, 0, (256 - pallen) * sizeof(*dst));
70
}
71
72
15
static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
73
                            AVPacket *avpkt)
74
{
75
    GetByteContext gb;
76
15
    AVFrame * const p  = data;
77
    int compressed, xmin, ymin, xmax, ymax;
78
    int ret;
79
    unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
80
                 bytes_per_scanline;
81
    uint8_t *ptr, *scanline;
82
83
15
    if (avpkt->size < PCX_HEADER_SIZE) {
84
        av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
85
        return AVERROR_INVALIDDATA;
86
    }
87
88
15
    bytestream2_init(&gb, avpkt->data, avpkt->size);
89
90

15
    if (bytestream2_get_byteu(&gb) != 0x0a || bytestream2_get_byteu(&gb) > 5) {
91
        av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
92
        return AVERROR_INVALIDDATA;
93
    }
94
95
15
    compressed                     = bytestream2_get_byteu(&gb);
96
15
    bits_per_pixel                 = bytestream2_get_byteu(&gb);
97
15
    xmin                           = bytestream2_get_le16u(&gb);
98
15
    ymin                           = bytestream2_get_le16u(&gb);
99
15
    xmax                           = bytestream2_get_le16u(&gb);
100
15
    ymax                           = bytestream2_get_le16u(&gb);
101
15
    avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb);
102
15
    avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb);
103
104

15
    if (xmax < xmin || ymax < ymin) {
105
        av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
106
        return AVERROR_INVALIDDATA;
107
    }
108
109
15
    w = xmax - xmin + 1;
110
15
    h = ymax - ymin + 1;
111
112
15
    bytestream2_skipu(&gb, 49);
113
15
    nplanes            = bytestream2_get_byteu(&gb);
114
15
    bytes_per_line     = bytestream2_get_le16u(&gb);
115
15
    bytes_per_scanline = nplanes * bytes_per_line;
116
117

15
    if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 ||
118
        (!compressed && bytes_per_scanline > bytestream2_get_bytes_left(&gb) / h)) {
119
        av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
120
        return AVERROR_INVALIDDATA;
121
    }
122
123
15
    switch ((nplanes << 8) + bits_per_pixel) {
124
15
    case 0x0308:
125
15
        avctx->pix_fmt = AV_PIX_FMT_RGB24;
126
15
        break;
127
    case 0x0108:
128
    case 0x0104:
129
    case 0x0102:
130
    case 0x0101:
131
    case 0x0401:
132
    case 0x0301:
133
    case 0x0201:
134
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
135
        break;
136
    default:
137
        av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
138
        return AVERROR_INVALIDDATA;
139
    }
140
141
15
    bytestream2_skipu(&gb, 60);
142
143
15
    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
144
        return ret;
145
146
15
    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
147
        return ret;
148
149
15
    p->pict_type = AV_PICTURE_TYPE_I;
150
151
15
    ptr    = p->data[0];
152
15
    stride = p->linesize[0];
153
154
15
    scanline = av_malloc(bytes_per_scanline + AV_INPUT_BUFFER_PADDING_SIZE);
155
15
    if (!scanline)
156
        return AVERROR(ENOMEM);
157
158

15
    if (nplanes == 3 && bits_per_pixel == 8) {
159
4335
        for (y = 0; y < h; y++) {
160
4320
            ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
161
4320
            if (ret < 0)
162
                goto end;
163
164
1524960
            for (x = 0; x < w; x++) {
165
1520640
                ptr[3 * x]     = scanline[x];
166
1520640
                ptr[3 * x + 1] = scanline[x + bytes_per_line];
167
1520640
                ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)];
168
            }
169
170
4320
            ptr += stride;
171
        }
172
    } else if (nplanes == 1 && bits_per_pixel == 8) {
173
        int palstart = avpkt->size - 769;
174
175
        if (avpkt->size < 769) {
176
            av_log(avctx, AV_LOG_ERROR, "File is too short\n");
177
            ret = avctx->err_recognition & AV_EF_EXPLODE ?
178
                  AVERROR_INVALIDDATA : avpkt->size;
179
            goto end;
180
        }
181
182
        for (y = 0; y < h; y++, ptr += stride) {
183
            ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
184
            if (ret < 0)
185
                goto end;
186
            memcpy(ptr, scanline, w);
187
        }
188
189
        if (bytestream2_tell(&gb) != palstart) {
190
            av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
191
            bytestream2_seek(&gb, palstart, SEEK_SET);
192
        }
193
        if (bytestream2_get_byte(&gb) != 12) {
194
            av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
195
            ret = avctx->err_recognition & AV_EF_EXPLODE ?
196
                  AVERROR_INVALIDDATA : avpkt->size;
197
            goto end;
198
        }
199
    } else if (nplanes == 1) {   /* all packed formats, max. 16 colors */
200
        GetBitContext s;
201
202
        for (y = 0; y < h; y++) {
203
            init_get_bits8(&s, scanline, bytes_per_scanline);
204
205
            ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
206
            if (ret < 0)
207
                goto end;
208
209
            for (x = 0; x < w; x++)
210
                ptr[x] = get_bits(&s, bits_per_pixel);
211
            ptr += stride;
212
        }
213
    } else {    /* planar, 4, 8 or 16 colors */
214
        int i;
215
216
        for (y = 0; y < h; y++) {
217
            ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
218
            if (ret < 0)
219
                goto end;
220
221
            for (x = 0; x < w; x++) {
222
                int m = 0x80 >> (x & 7), v = 0;
223
                for (i = nplanes - 1; i >= 0; i--) {
224
                    v <<= 1;
225
                    v  += !!(scanline[i * bytes_per_line + (x >> 3)] & m);
226
                }
227
                ptr[x] = v;
228
            }
229
            ptr += stride;
230
        }
231
    }
232
233
15
    ret = bytestream2_tell(&gb);
234

15
    if (nplanes == 1 && bits_per_pixel == 8) {
235
        pcx_palette(&gb, (uint32_t *)p->data[1], 256);
236
        ret += 256 * 3;
237
15
    } else if (bits_per_pixel * nplanes == 1) {
238
        AV_WN32A(p->data[1]  , 0xFF000000);
239
        AV_WN32A(p->data[1]+4, 0xFFFFFFFF);
240
15
    } else if (bits_per_pixel < 8) {
241
        bytestream2_seek(&gb, 16, SEEK_SET);
242
        pcx_palette(&gb, (uint32_t *)p->data[1], 16);
243
    }
244
245
15
    *got_frame = 1;
246
247
15
end:
248
15
    av_free(scanline);
249
15
    return ret;
250
}
251
252
AVCodec ff_pcx_decoder = {
253
    .name         = "pcx",
254
    .long_name    = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
255
    .type         = AVMEDIA_TYPE_VIDEO,
256
    .id           = AV_CODEC_ID_PCX,
257
    .decode       = pcx_decode_frame,
258
    .capabilities = AV_CODEC_CAP_DR1,
259
};