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FFmpeg/libavcodec/xpmdec.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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15 KiB
C
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/*
* XPM image format
*
* Copyright (c) 2012 Paul B Mahol
* Copyright (c) 2017 Paras Chadha
*
* 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
*/
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#define MIN_ELEMENT ' '
#define MAX_ELEMENT 0xfe
#define NB_ELEMENTS (MAX_ELEMENT - MIN_ELEMENT + 1)
typedef struct XPMContext {
uint32_t *pixels;
int pixels_size;
uint8_t *buf;
int buf_size;
} XPMDecContext;
typedef struct ColorEntry {
const char *name; ///< a string representing the name of the color
uint32_t rgb_color; ///< RGB values for the color
} ColorEntry;
static int color_table_compare(const void *lhs, const void *rhs)
{
return av_strcasecmp(lhs, ((const ColorEntry *)rhs)->name);
}
static const ColorEntry color_table[] = {
{ "AliceBlue", 0xFFF0F8FF },
{ "AntiqueWhite", 0xFFFAEBD7 },
{ "Aqua", 0xFF00FFFF },
{ "Aquamarine", 0xFF7FFFD4 },
{ "Azure", 0xFFF0FFFF },
{ "Beige", 0xFFF5F5DC },
{ "Bisque", 0xFFFFE4C4 },
{ "Black", 0xFF000000 },
{ "BlanchedAlmond", 0xFFFFEBCD },
{ "Blue", 0xFF0000FF },
{ "BlueViolet", 0xFF8A2BE2 },
{ "Brown", 0xFFA52A2A },
{ "BurlyWood", 0xFFDEB887 },
{ "CadetBlue", 0xFF5F9EA0 },
{ "Chartreuse", 0xFF7FFF00 },
{ "Chocolate", 0xFFD2691E },
{ "Coral", 0xFFFF7F50 },
{ "CornflowerBlue", 0xFF6495ED },
{ "Cornsilk", 0xFFFFF8DC },
{ "Crimson", 0xFFDC143C },
{ "Cyan", 0xFF00FFFF },
{ "DarkBlue", 0xFF00008B },
{ "DarkCyan", 0xFF008B8B },
{ "DarkGoldenRod", 0xFFB8860B },
{ "DarkGray", 0xFFA9A9A9 },
{ "DarkGreen", 0xFF006400 },
{ "DarkKhaki", 0xFFBDB76B },
{ "DarkMagenta", 0xFF8B008B },
{ "DarkOliveGreen", 0xFF556B2F },
{ "Darkorange", 0xFFFF8C00 },
{ "DarkOrchid", 0xFF9932CC },
{ "DarkRed", 0xFF8B0000 },
{ "DarkSalmon", 0xFFE9967A },
{ "DarkSeaGreen", 0xFF8FBC8F },
{ "DarkSlateBlue", 0xFF483D8B },
{ "DarkSlateGray", 0xFF2F4F4F },
{ "DarkTurquoise", 0xFF00CED1 },
{ "DarkViolet", 0xFF9400D3 },
{ "DeepPink", 0xFFFF1493 },
{ "DeepSkyBlue", 0xFF00BFFF },
{ "DimGray", 0xFF696969 },
{ "DodgerBlue", 0xFF1E90FF },
{ "FireBrick", 0xFFB22222 },
{ "FloralWhite", 0xFFFFFAF0 },
{ "ForestGreen", 0xFF228B22 },
{ "Fuchsia", 0xFFFF00FF },
{ "Gainsboro", 0xFFDCDCDC },
{ "GhostWhite", 0xFFF8F8FF },
{ "Gold", 0xFFFFD700 },
{ "GoldenRod", 0xFFDAA520 },
{ "Gray", 0xFFBEBEBE },
{ "Green", 0xFF00FF00 },
{ "GreenYellow", 0xFFADFF2F },
{ "HoneyDew", 0xFFF0FFF0 },
{ "HotPink", 0xFFFF69B4 },
{ "IndianRed", 0xFFCD5C5C },
{ "Indigo", 0xFF4B0082 },
{ "Ivory", 0xFFFFFFF0 },
{ "Khaki", 0xFFF0E68C },
{ "Lavender", 0xFFE6E6FA },
{ "LavenderBlush", 0xFFFFF0F5 },
{ "LawnGreen", 0xFF7CFC00 },
{ "LemonChiffon", 0xFFFFFACD },
{ "LightBlue", 0xFFADD8E6 },
{ "LightCoral", 0xFFF08080 },
{ "LightCyan", 0xFFE0FFFF },
{ "LightGoldenRodYellow", 0xFFFAFAD2 },
{ "LightGreen", 0xFF90EE90 },
{ "LightGrey", 0xFFD3D3D3 },
{ "LightPink", 0xFFFFB6C1 },
{ "LightSalmon", 0xFFFFA07A },
{ "LightSeaGreen", 0xFF20B2AA },
{ "LightSkyBlue", 0xFF87CEFA },
{ "LightSlateGray", 0xFF778899 },
{ "LightSteelBlue", 0xFFB0C4DE },
{ "LightYellow", 0xFFFFFFE0 },
{ "Lime", 0xFF00FF00 },
{ "LimeGreen", 0xFF32CD32 },
{ "Linen", 0xFFFAF0E6 },
{ "Magenta", 0xFFFF00FF },
{ "Maroon", 0xFFB03060 },
{ "MediumAquaMarine", 0xFF66CDAA },
{ "MediumBlue", 0xFF0000CD },
{ "MediumOrchid", 0xFFBA55D3 },
{ "MediumPurple", 0xFF9370D8 },
{ "MediumSeaGreen", 0xFF3CB371 },
{ "MediumSlateBlue", 0xFF7B68EE },
{ "MediumSpringGreen", 0xFF00FA9A },
{ "MediumTurquoise", 0xFF48D1CC },
{ "MediumVioletRed", 0xFFC71585 },
{ "MidnightBlue", 0xFF191970 },
{ "MintCream", 0xFFF5FFFA },
{ "MistyRose", 0xFFFFE4E1 },
{ "Moccasin", 0xFFFFE4B5 },
{ "NavajoWhite", 0xFFFFDEAD },
{ "Navy", 0xFF000080 },
{ "None", 0x00000000 },
{ "OldLace", 0xFFFDF5E6 },
{ "Olive", 0xFF808000 },
{ "OliveDrab", 0xFF6B8E23 },
{ "Orange", 0xFFFFA500 },
{ "OrangeRed", 0xFFFF4500 },
{ "Orchid", 0xFFDA70D6 },
{ "PaleGoldenRod", 0xFFEEE8AA },
{ "PaleGreen", 0xFF98FB98 },
{ "PaleTurquoise", 0xFFAFEEEE },
{ "PaleVioletRed", 0xFFD87093 },
{ "PapayaWhip", 0xFFFFEFD5 },
{ "PeachPuff", 0xFFFFDAB9 },
{ "Peru", 0xFFCD853F },
{ "Pink", 0xFFFFC0CB },
{ "Plum", 0xFFDDA0DD },
{ "PowderBlue", 0xFFB0E0E6 },
{ "Purple", 0xFFA020F0 },
{ "Red", 0xFFFF0000 },
{ "RosyBrown", 0xFFBC8F8F },
{ "RoyalBlue", 0xFF4169E1 },
{ "SaddleBrown", 0xFF8B4513 },
{ "Salmon", 0xFFFA8072 },
{ "SandyBrown", 0xFFF4A460 },
{ "SeaGreen", 0xFF2E8B57 },
{ "SeaShell", 0xFFFFF5EE },
{ "Sienna", 0xFFA0522D },
{ "Silver", 0xFFC0C0C0 },
{ "SkyBlue", 0xFF87CEEB },
{ "SlateBlue", 0xFF6A5ACD },
{ "SlateGray", 0xFF708090 },
{ "Snow", 0xFFFFFAFA },
{ "SpringGreen", 0xFF00FF7F },
{ "SteelBlue", 0xFF4682B4 },
{ "Tan", 0xFFD2B48C },
{ "Teal", 0xFF008080 },
{ "Thistle", 0xFFD8BFD8 },
{ "Tomato", 0xFFFF6347 },
{ "Turquoise", 0xFF40E0D0 },
{ "Violet", 0xFFEE82EE },
{ "Wheat", 0xFFF5DEB3 },
{ "White", 0xFFFFFFFF },
{ "WhiteSmoke", 0xFFF5F5F5 },
{ "Yellow", 0xFFFFFF00 },
{ "YellowGreen", 0xFF9ACD32 }
};
static unsigned hex_char_to_number(uint8_t x)
{
#define TIMES256(idx) \
TIMES64(4 * (idx)) TIMES64(4 * (idx) + 1) TIMES64(4 * (idx) + 2) TIMES64(4 * (idx) + 3)
#define TIMES64(idx) \
TIMES16(4 * (idx)) TIMES16(4 * (idx) + 1) TIMES16(4 * (idx) + 2) TIMES16(4 * (idx) + 3)
#define TIMES16(idx) \
TIMES4(4 * (idx)) TIMES4(4 * (idx) + 1) TIMES4(4 * (idx) + 2) TIMES4(4 * (idx) + 3)
#define TIMES4(idx) \
ENTRY(4 * (idx)) ENTRY(4 * (idx) + 1) ENTRY(4 * (idx) + 2) ENTRY(4 * (idx) + 3)
#define ENTRY(x) [x] = ((x) >= 'a' && (x) <= 'f') ? (x) - ('a' - 10) : \
((x) >= 'A' && (x) <= 'F') ? (x) - ('A' - 10) : \
((x) >= '0' && (x) <= '9') ? (x) - '0' : 0,
static const uint8_t lut[] = {
TIMES256(0)
};
return lut[x];
}
/*
* Function same as strcspn but ignores characters if they are inside a C style comments
*/
static size_t mod_strcspn(const char *string, const char *reject)
{
int i, j;
for (i = 0; string && string[i]; i++) {
if (string[i] == '/' && string[i+1] == '*') {
i += 2;
while ( string && string[i] && (string[i] != '*' || string[i+1] != '/') )
i++;
i++;
} else if (string[i] == '/' && string[i+1] == '/') {
i += 2;
while ( string && string[i] && string[i] != '\n' )
i++;
} else {
for (j = 0; reject && reject[j]; j++) {
if (string[i] == reject[j])
break;
}
if (reject && reject[j])
break;
}
}
return i;
}
static uint32_t color_string_to_rgba(const char *p, size_t len)
{
uint32_t ret = 0xFF000000;
const ColorEntry *entry;
char color_name[100];
if (*p == '#') {
p++;
len--;
if (len == 3) {
ret |= (hex_char_to_number(p[2]) << 4) |
(hex_char_to_number(p[1]) << 12) |
(hex_char_to_number(p[0]) << 20);
} else if (len == 4) {
ret = (hex_char_to_number(p[3]) << 4) |
(hex_char_to_number(p[2]) << 12) |
(hex_char_to_number(p[1]) << 20) |
(hex_char_to_number(p[0]) << 28);
} else if (len == 6) {
ret |= hex_char_to_number(p[5]) |
(hex_char_to_number(p[4]) << 4) |
(hex_char_to_number(p[3]) << 8) |
(hex_char_to_number(p[2]) << 12) |
(hex_char_to_number(p[1]) << 16) |
(hex_char_to_number(p[0]) << 20);
} else if (len == 8) {
ret = hex_char_to_number(p[7]) |
(hex_char_to_number(p[6]) << 4) |
(hex_char_to_number(p[5]) << 8) |
(hex_char_to_number(p[4]) << 12) |
(hex_char_to_number(p[3]) << 16) |
(hex_char_to_number(p[2]) << 20) |
(hex_char_to_number(p[1]) << 24) |
(hex_char_to_number(p[0]) << 28);
}
} else {
len = FFMIN(len, sizeof(color_name) - 1);
strncpy(color_name, p, len);
color_name[len] = '\0';
entry = bsearch(color_name,
color_table,
FF_ARRAY_ELEMS(color_table),
sizeof(ColorEntry),
color_table_compare);
if (!entry)
return ret;
ret = entry->rgb_color;
}
return ret;
}
static int ascii2index(const uint8_t *cpixel, int cpp)
{
const uint8_t *p = cpixel;
int n = 0, m = 1, i;
for (i = 0; i < cpp; i++) {
if (*p < MIN_ELEMENT || *p > MAX_ELEMENT)
return AVERROR_INVALIDDATA;
n += (*p++ - MIN_ELEMENT) * m;
m *= NB_ELEMENTS;
}
return n;
}
static int xpm_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
XPMDecContext *x = avctx->priv_data;
const uint8_t *end, *ptr;
int ncolors, cpp, ret, i, j;
int64_t size;
uint32_t *dst;
int width, height;
avctx->pix_fmt = AV_PIX_FMT_BGRA;
av_fast_padded_malloc(&x->buf, &x->buf_size, avpkt->size);
if (!x->buf)
return AVERROR(ENOMEM);
memcpy(x->buf, avpkt->data, avpkt->size);
x->buf[avpkt->size] = 0;
ptr = x->buf;
end = x->buf + avpkt->size;
while (end - ptr > 9 && memcmp(ptr, "/* XPM */", 9))
ptr++;
if (end - ptr <= 9) {
av_log(avctx, AV_LOG_ERROR, "missing signature\n");
return AVERROR_INVALIDDATA;
}
ptr += mod_strcspn(ptr, "\"");
if (sscanf(ptr, "\"%u %u %u %u\",",
&width, &height, &ncolors, &cpp) != 4) {
av_log(avctx, AV_LOG_ERROR, "missing image parameters\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
if (cpp <= 0 || cpp >= 5) {
av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of chars per pixel: %d\n", cpp);
return AVERROR_INVALIDDATA;
}
size = 1;
for (i = 0; i < cpp; i++)
size *= NB_ELEMENTS;
if (ncolors <= 0 || ncolors > size) {
av_log(avctx, AV_LOG_ERROR, "invalid number of colors: %d\n", ncolors);
return AVERROR_INVALIDDATA;
}
if (size > SIZE_MAX / 4)
return AVERROR(ENOMEM);
size *= 4;
ptr += mod_strcspn(ptr, ",") + 1;
if (end - ptr < 1)
return AVERROR_INVALIDDATA;
if (avctx->skip_frame >= AVDISCARD_ALL)
return avpkt->size;
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
if (!x->pixels)
return AVERROR(ENOMEM);
for (i = 0; i < ncolors; i++) {
const uint8_t *index;
size_t len;
ptr += mod_strcspn(ptr, "\"") + 1;
if (end - ptr < cpp)
return AVERROR_INVALIDDATA;
index = ptr;
ptr += cpp;
ptr = strstr(ptr, "c ");
if (ptr) {
ptr += 2;
} else {
return AVERROR_INVALIDDATA;
}
len = strcspn(ptr, "\" ");
if ((ret = ascii2index(index, cpp)) < 0)
return ret;
x->pixels[ret] = color_string_to_rgba(ptr, len);
ptr += mod_strcspn(ptr, ",") + 1;
if (end - ptr < 1)
return AVERROR_INVALIDDATA;
}
for (i = 0; i < avctx->height; i++) {
dst = (uint32_t *)(p->data[0] + i * p->linesize[0]);
if (end - ptr < 1)
return AVERROR_INVALIDDATA;
ptr += mod_strcspn(ptr, "\"") + 1;
if (end - ptr < 1)
return AVERROR_INVALIDDATA;
for (j = 0; j < avctx->width; j++) {
if (end - ptr < cpp)
return AVERROR_INVALIDDATA;
if ((ret = ascii2index(ptr, cpp)) < 0)
return ret;
*dst++ = x->pixels[ret];
ptr += cpp;
}
ptr += mod_strcspn(ptr, ",") + 1;
}
p->flags |= AV_FRAME_FLAG_KEY;
p->pict_type = AV_PICTURE_TYPE_I;
*got_frame = 1;
return avpkt->size;
}
static av_cold int xpm_decode_close(AVCodecContext *avctx)
{
XPMDecContext *x = avctx->priv_data;
av_freep(&x->pixels);
av_freep(&x->buf);
x->buf_size = 0;
return 0;
}
const FFCodec ff_xpm_decoder = {
.p.name = "xpm",
CODEC_LONG_NAME("XPM (X PixMap) image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_XPM,
.p.capabilities = AV_CODEC_CAP_DR1,
.priv_data_size = sizeof(XPMDecContext),
.close = xpm_decode_close,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
FF_CODEC_DECODE_CB(xpm_decode_frame),
};
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