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FFmpeg/libavcodec/xpmdec.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

449 lines
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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/parseutils.h"
#include "libavutil/avstring.h"
#include "avcodec.h"
#include "internal.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)
{
if (x >= 'a' && x <= 'f')
x -= 'a' - 10;
else if (x >= 'A' && x <= 'F')
x -= 'A' - 10;
else if (x >= '0' && x <= '9')
x -= '0';
else
x = 0;
return 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, int len)
{
uint32_t ret = 0xFF000000;
const ColorEntry *entry;
char color_name[100];
len = FFMIN(FFMAX(len, 0), sizeof(color_name) - 1);
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 {
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, void *data,
int *got_frame, AVPacket *avpkt)
{
XPMDecContext *x = avctx->priv_data;
AVFrame *p=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 ((ret = ff_get_buffer(avctx, p, 0)) < 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;
}
size *= 4;
av_fast_padded_malloc(&x->pixels, &x->pixels_size, size);
if (!x->pixels)
return AVERROR(ENOMEM);
ptr += mod_strcspn(ptr, ",") + 1;
if (end - ptr < 1)
return AVERROR_INVALIDDATA;
for (i = 0; i < ncolors; i++) {
const uint8_t *index;
int 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->key_frame = 1;
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 AVCodec ff_xpm_decoder = {
.name = "xpm",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_XPM,
.priv_data_size = sizeof(XPMDecContext),
.close = xpm_decode_close,
.decode = xpm_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("XPM (X PixMap) image")
};
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