libavfilter/parseutils.c

   1 /*
   2  * copyright (c) 2009 Stefano Sabatini
   3  * This file is part of FFmpeg.
   4  *
   5  * FFmpeg is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * FFmpeg is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with FFmpeg; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 /**
  21  * @file libavfilter/parseutils.c
  22  * parsing utils
  23  */
  24
  25 #include <string.h>
  26 #include "libavutil/avutil.h"
  27 #include "parseutils.h"
  28
  29 #define WHITESPACES " \n\t"
  30
  31 char *av_get_token(const char **buf, const char *term)
  32 {
  33     char *out = av_malloc(strlen(*buf) + 1);
  34     char *ret= out, *end= out;
  35     const char *p = *buf;
  36     p += strspn(p, WHITESPACES);
  37
  38     while(*p && !strspn(p, term)) {
  39         char c = *p++;
  40         if(c == '\\' && *p){
  41             *out++ = *p++;
  42             end= out;
  43         }else if(c == '\''){
  44             while(*p && *p != '\'')
  45                 *out++ = *p++;
  46             if(*p){
  47                 p++;
  48                 end= out;
  49             }
  50         }else{
  51             *out++ = c;
  52         }
  53     }
  54
  55     do{
  56         *out-- = 0;
  57     }while(out >= end && strspn(out, WHITESPACES));
  58
  59     *buf = p;
  60
  61     return ret;
  62 }
  63
  64 typedef struct {
  65     const char *name;            ///< a string representing the name of the color
  66     uint8_t     rgba_color[4];   ///< RGBA values for the color
  67 } ColorEntry;
  68
  69 static ColorEntry color_table[] = {
  70     { "AliceBlue",            { 0xF0, 0xF8, 0xFF } },
  71     { "AntiqueWhite",         { 0xFA, 0xEB, 0xD7 } },
  72     { "Aqua",                 { 0x00, 0xFF, 0xFF } },
  73     { "Aquamarine",           { 0x7F, 0xFF, 0xD4 } },
  74     { "Azure",                { 0xF0, 0xFF, 0xFF } },
  75     { "Beige",                { 0xF5, 0xF5, 0xDC } },
  76     { "Bisque",               { 0xFF, 0xE4, 0xC4 } },
  77     { "Black",                { 0x00, 0x00, 0x00 } },
  78     { "BlanchedAlmond",       { 0xFF, 0xEB, 0xCD } },
  79     { "Blue",                 { 0x00, 0x00, 0xFF } },
  80     { "BlueViolet",           { 0x8A, 0x2B, 0xE2 } },
  81     { "Brown",                { 0xA5, 0x2A, 0x2A } },
  82     { "BurlyWood",            { 0xDE, 0xB8, 0x87 } },
  83     { "CadetBlue",            { 0x5F, 0x9E, 0xA0 } },
  84     { "Chartreuse",           { 0x7F, 0xFF, 0x00 } },
  85     { "Chocolate",            { 0xD2, 0x69, 0x1E } },
  86     { "Coral",                { 0xFF, 0x7F, 0x50 } },
  87     { "CornflowerBlue",       { 0x64, 0x95, 0xED } },
  88     { "Cornsilk",             { 0xFF, 0xF8, 0xDC } },
  89     { "Crimson",              { 0xDC, 0x14, 0x3C } },
  90     { "Cyan",                 { 0x00, 0xFF, 0xFF } },
  91     { "DarkBlue",             { 0x00, 0x00, 0x8B } },
  92     { "DarkCyan",             { 0x00, 0x8B, 0x8B } },
  93     { "DarkGoldenRod",        { 0xB8, 0x86, 0x0B } },
  94     { "DarkGray",             { 0xA9, 0xA9, 0xA9 } },
  95     { "DarkGreen",            { 0x00, 0x64, 0x00 } },
  96     { "DarkKhaki",            { 0xBD, 0xB7, 0x6B } },
  97     { "DarkMagenta",          { 0x8B, 0x00, 0x8B } },
  98     { "DarkOliveGreen",       { 0x55, 0x6B, 0x2F } },
  99     { "Darkorange",           { 0xFF, 0x8C, 0x00 } },
 100     { "DarkOrchid",           { 0x99, 0x32, 0xCC } },
 101     { "DarkRed",              { 0x8B, 0x00, 0x00 } },
 102     { "DarkSalmon",           { 0xE9, 0x96, 0x7A } },
 103     { "DarkSeaGreen",         { 0x8F, 0xBC, 0x8F } },
 104     { "DarkSlateBlue",        { 0x48, 0x3D, 0x8B } },
 105     { "DarkSlateGray",        { 0x2F, 0x4F, 0x4F } },
 106     { "DarkTurquoise",        { 0x00, 0xCE, 0xD1 } },
 107     { "DarkViolet",           { 0x94, 0x00, 0xD3 } },
 108     { "DeepPink",             { 0xFF, 0x14, 0x93 } },
 109     { "DeepSkyBlue",          { 0x00, 0xBF, 0xFF } },
 110     { "DimGray",              { 0x69, 0x69, 0x69 } },
 111     { "DodgerBlue",           { 0x1E, 0x90, 0xFF } },
 112     { "FireBrick",            { 0xB2, 0x22, 0x22 } },
 113     { "FloralWhite",          { 0xFF, 0xFA, 0xF0 } },
 114     { "ForestGreen",          { 0x22, 0x8B, 0x22 } },
 115     { "Fuchsia",              { 0xFF, 0x00, 0xFF } },
 116     { "Gainsboro",            { 0xDC, 0xDC, 0xDC } },
 117     { "GhostWhite",           { 0xF8, 0xF8, 0xFF } },
 118     { "Gold",                 { 0xFF, 0xD7, 0x00 } },
 119     { "GoldenRod",            { 0xDA, 0xA5, 0x20 } },
 120     { "Gray",                 { 0x80, 0x80, 0x80 } },
 121     { "Green",                { 0x00, 0x80, 0x00 } },
 122     { "GreenYellow",          { 0xAD, 0xFF, 0x2F } },
 123     { "HoneyDew",             { 0xF0, 0xFF, 0xF0 } },
 124     { "HotPink",              { 0xFF, 0x69, 0xB4 } },
 125     { "IndianRed",            { 0xCD, 0x5C, 0x5C } },
 126     { "Indigo",               { 0x4B, 0x00, 0x82 } },
 127     { "Ivory",                { 0xFF, 0xFF, 0xF0 } },
 128     { "Khaki",                { 0xF0, 0xE6, 0x8C } },
 129     { "Lavender",             { 0xE6, 0xE6, 0xFA } },
 130     { "LavenderBlush",        { 0xFF, 0xF0, 0xF5 } },
 131     { "LawnGreen",            { 0x7C, 0xFC, 0x00 } },
 132     { "LemonChiffon",         { 0xFF, 0xFA, 0xCD } },
 133     { "LightBlue",            { 0xAD, 0xD8, 0xE6 } },
 134     { "LightCoral",           { 0xF0, 0x80, 0x80 } },
 135     { "LightCyan",            { 0xE0, 0xFF, 0xFF } },
 136     { "LightGoldenRodYellow", { 0xFA, 0xFA, 0xD2 } },
 137     { "LightGrey",            { 0xD3, 0xD3, 0xD3 } },
 138     { "LightGreen",           { 0x90, 0xEE, 0x90 } },
 139     { "LightPink",            { 0xFF, 0xB6, 0xC1 } },
 140     { "LightSalmon",          { 0xFF, 0xA0, 0x7A } },
 141     { "LightSeaGreen",        { 0x20, 0xB2, 0xAA } },
 142     { "LightSkyBlue",         { 0x87, 0xCE, 0xFA } },
 143     { "LightSlateGray",       { 0x77, 0x88, 0x99 } },
 144     { "LightSteelBlue",       { 0xB0, 0xC4, 0xDE } },
 145     { "LightYellow",          { 0xFF, 0xFF, 0xE0 } },
 146     { "Lime",                 { 0x00, 0xFF, 0x00 } },
 147     { "LimeGreen",            { 0x32, 0xCD, 0x32 } },
 148     { "Linen",                { 0xFA, 0xF0, 0xE6 } },
 149     { "Magenta",              { 0xFF, 0x00, 0xFF } },
 150     { "Maroon",               { 0x80, 0x00, 0x00 } },
 151     { "MediumAquaMarine",     { 0x66, 0xCD, 0xAA } },
 152     { "MediumBlue",           { 0x00, 0x00, 0xCD } },
 153     { "MediumOrchid",         { 0xBA, 0x55, 0xD3 } },
 154     { "MediumPurple",         { 0x93, 0x70, 0xD8 } },
 155     { "MediumSeaGreen",       { 0x3C, 0xB3, 0x71 } },
 156     { "MediumSlateBlue",      { 0x7B, 0x68, 0xEE } },
 157     { "MediumSpringGreen",    { 0x00, 0xFA, 0x9A } },
 158     { "MediumTurquoise",      { 0x48, 0xD1, 0xCC } },
 159     { "MediumVioletRed",      { 0xC7, 0x15, 0x85 } },
 160     { "MidnightBlue",         { 0x19, 0x19, 0x70 } },
 161     { "MintCream",            { 0xF5, 0xFF, 0xFA } },
 162     { "MistyRose",            { 0xFF, 0xE4, 0xE1 } },
 163     { "Moccasin",             { 0xFF, 0xE4, 0xB5 } },
 164     { "NavajoWhite",          { 0xFF, 0xDE, 0xAD } },
 165     { "Navy",                 { 0x00, 0x00, 0x80 } },
 166     { "OldLace",              { 0xFD, 0xF5, 0xE6 } },
 167     { "Olive",                { 0x80, 0x80, 0x00 } },
 168     { "OliveDrab",            { 0x6B, 0x8E, 0x23 } },
 169     { "Orange",               { 0xFF, 0xA5, 0x00 } },
 170     { "OrangeRed",            { 0xFF, 0x45, 0x00 } },
 171     { "Orchid",               { 0xDA, 0x70, 0xD6 } },
 172     { "PaleGoldenRod",        { 0xEE, 0xE8, 0xAA } },
 173     { "PaleGreen",            { 0x98, 0xFB, 0x98 } },
 174     { "PaleTurquoise",        { 0xAF, 0xEE, 0xEE } },
 175     { "PaleVioletRed",        { 0xD8, 0x70, 0x93 } },
 176     { "PapayaWhip",           { 0xFF, 0xEF, 0xD5 } },
 177     { "PeachPuff",            { 0xFF, 0xDA, 0xB9 } },
 178     { "Peru",                 { 0xCD, 0x85, 0x3F } },
 179     { "Pink",                 { 0xFF, 0xC0, 0xCB } },
 180     { "Plum",                 { 0xDD, 0xA0, 0xDD } },
 181     { "PowderBlue",           { 0xB0, 0xE0, 0xE6 } },
 182     { "Purple",               { 0x80, 0x00, 0x80 } },
 183     { "Red",                  { 0xFF, 0x00, 0x00 } },
 184     { "RosyBrown",            { 0xBC, 0x8F, 0x8F } },
 185     { "RoyalBlue",            { 0x41, 0x69, 0xE1 } },
 186     { "SaddleBrown",          { 0x8B, 0x45, 0x13 } },
 187     { "Salmon",               { 0xFA, 0x80, 0x72 } },
 188     { "SandyBrown",           { 0xF4, 0xA4, 0x60 } },
 189     { "SeaGreen",             { 0x2E, 0x8B, 0x57 } },
 190     { "SeaShell",             { 0xFF, 0xF5, 0xEE } },
 191     { "Sienna",               { 0xA0, 0x52, 0x2D } },
 192     { "Silver",               { 0xC0, 0xC0, 0xC0 } },
 193     { "SkyBlue",              { 0x87, 0xCE, 0xEB } },
 194     { "SlateBlue",            { 0x6A, 0x5A, 0xCD } },
 195     { "SlateGray",            { 0x70, 0x80, 0x90 } },
 196     { "Snow",                 { 0xFF, 0xFA, 0xFA } },
 197     { "SpringGreen",          { 0x00, 0xFF, 0x7F } },
 198     { "SteelBlue",            { 0x46, 0x82, 0xB4 } },
 199     { "Tan",                  { 0xD2, 0xB4, 0x8C } },
 200     { "Teal",                 { 0x00, 0x80, 0x80 } },
 201     { "Thistle",              { 0xD8, 0xBF, 0xD8 } },
 202     { "Tomato",               { 0xFF, 0x63, 0x47 } },
 203     { "Turquoise",            { 0x40, 0xE0, 0xD0 } },
 204     { "Violet",               { 0xEE, 0x82, 0xEE } },
 205     { "Wheat",                { 0xF5, 0xDE, 0xB3 } },
 206     { "White",                { 0xFF, 0xFF, 0xFF } },
 207     { "WhiteSmoke",           { 0xF5, 0xF5, 0xF5 } },
 208     { "Yellow",               { 0xFF, 0xFF, 0x00 } },
 209     { "YellowGreen",          { 0x9A, 0xCD, 0x32 } },
 210 };
 211
 212 static int color_table_compare(const void *lhs, const void *rhs)
 213 {
 214     return strcmp(lhs, ((const ColorEntry *)rhs)->name);
 215 }
 216
 217 int av_parse_color(uint8_t *rgba_color, const char *color_string, void *log_ctx)
 218 {
 219     if (!strncmp(color_string, "0x", 2)) {
 220         char *tail;
 221         int len = strlen(color_string);
 222         int rgba = strtol(color_string, &tail, 16);
 223
 224         if (*tail || (len != 8 && len != 10)) {
 225             av_log(log_ctx, AV_LOG_ERROR, "Invalid 0xRRGGBB[AA] color string: '%s'\n", color_string);
 226             return -1;
 227         }
 228         if (len == 10) {
 229             rgba_color[3] = rgba;
 230             rgba >>= 8;
 231         }
 232         rgba_color[0] = rgba >> 16;
 233         rgba_color[1] = rgba >> 8;
 234         rgba_color[2] = rgba;
 235     } else {
 236         const ColorEntry *entry = bsearch(color_string,
 237                                           color_table,
 238                                           FF_ARRAY_ELEMS(color_table),
 239                                           sizeof(ColorEntry),
 240                                           color_table_compare);
 241         if (!entry) {
 242             av_log(log_ctx, AV_LOG_DEBUG, "Cannot find color '%s'\n", color_string);
 243             return -1;
 244         }
 245         memcpy(rgba_color, entry->rgba_color, 4);
 246     }
 247
 248     return 0;
 249 }
 250
 251 #ifdef TEST
 252
 253 #undef printf
 254
 255 int main(void)
 256 {
 257     int i;
 258
 259     const char *strings[] = {
 260         "''",
 261         "",
 262         ":",
 263         "\\",
 264         "'",
 265         "    ''    :",
 266         "    ''  ''  :",
 267         "foo   '' :",
 268         "'foo'",
 269         "foo     ",
 270         "foo\\",
 271         "foo':  blah:blah",
 272         "foo\\:  blah:blah",
 273         "foo\'",
 274         "'foo :  '  :blahblah",
 275         "\\ :blah",
 276         "     foo",
 277         "      foo       ",
 278         "      foo     \\ ",
 279         "foo ':blah",
 280         " foo   bar    :   blahblah",
 281         "\\f\\o\\o",
 282         "'foo : \\ \\  '   : blahblah",
 283         "'\\fo\\o:': blahblah",
 284         "\\'fo\\o\\:':  foo  '  :blahblah"
 285     };
 286
 287     for (i=0; i < FF_ARRAY_ELEMS(strings); i++) {
 288         const char *p= strings[i];
 289         printf("|%s|", p);
 290         printf(" -> |%s|", av_get_token(&p, ":"));
 291         printf(" + |%s|\n", p);
 292     }
 293
 294     printf("\nTesting av_parse_color()\n");
 295     {
 296         uint8_t rgba[4];
 297         const char *color_names[] = {
 298             "foo",
 299             "red",
 300             "Red ",
 301             "RED",
 302             "Violet",
 303             "Yellow",
 304             "Red",
 305             "0x000000",
 306             "0x0000000",
 307             "0x3e34ff",
 308             "0x3e34ffaa",
 309             "0xffXXee",
 310             "0xfoobar",
 311             "0xffffeeeeeeee",
 312         };
 313
 314         av_log_set_level(AV_LOG_DEBUG);
 315
 316         for (int i = 0;  i < FF_ARRAY_ELEMS(color_names); i++) {
 317             if (av_parse_color(rgba, color_names[i], NULL) >= 0)
 318                 printf("%s -> R(%d) G(%d) B(%d) A(%d)\n", color_names[i], rgba[0], rgba[1], rgba[2], rgba[3]);
 319         }
 320     }
 321
 322     return 0;
 323 }
 324
 325 #endif