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/* xbm.c
* portable bitmap format (xbm) decoder
* (c) 2002 Petr 'Brain' Kulhavy
* This file is a part of the Links program, released under GPL
*/
#include "cfg.h"
#ifdef G
#include "links.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define XBM_BUFFER_LEN 1024
#ifdef min
#undef min
#endif
#ifdef max
#undef max
#endif
#define min(a,b) (a<b?a:b)
#define max(a,b) (a>b?a:b)
struct xbm_decoder{
int width, height; /* rozmery obrazku */
int partnum; /* buffer skoncil uprostred cisla */
int *numdest; /* kam se ma ukladat to cislo kdyz je partnum */
int in_data_block; /* jsme v bloku dat (uz jsme precetli otviraci slozenou zavorku) */
int image_pos; /* pixelova pozice v cimg->buffer */
int pixels; /* velikost cimg->buffer v pixelech */
int state; /* stav automatu na zrani komentaru */
int actual_eight; /* aktualni cislo, ktere se ma putnout do cimg */
int line_pos; /* aktualni pozice pixelu na radce (kolik pixelu v cimg->buffer je platnych na momentalne zpracovavane radce) */
unsigned char barvicky[6]; /* 0-2 background, 3-5 foreground */
/*
* stavy:
* 0 - mimo komentar
* 1 - za 1. lomitkem
* 2 - za 1. lomitkem a hvezdickou
* 3 - za 2. hvezdickou
*/
int buffer_pos; /* delka platnych dat v bufferu */
unsigned char buffer[XBM_BUFFER_LEN];
};
static unsigned char *my_memmem(unsigned char *h, int hl, unsigned char *n, int nl)
{
for (;hl>=nl;hl--,h++)
if (*h==*n&&!memcmp(h,n,nl))return h;
return NULL;
}
void xbm_start(struct cached_image *cimg)
{
struct xbm_decoder *deco;
unsigned short r,g,b;
deco=mem_alloc(sizeof(struct xbm_decoder));
cimg->decoder=deco;
deco->state=0;
deco->width=-1;
deco->height=-1;
deco->buffer_pos=0;
deco->partnum=0;
deco->in_data_block=0;
round_color_sRGB_to_48(&r,&g,&b,cimg->background_color);
deco->barvicky[0]=apply_gamma_single_16_to_8(r,display_red_gamma);
deco->barvicky[1]=apply_gamma_single_16_to_8(g,display_green_gamma);
deco->barvicky[2]=apply_gamma_single_16_to_8(b,display_blue_gamma);
round_color_sRGB_to_48(&r,&g,&b,get_foreground(cimg->background_color));
deco->barvicky[3]=apply_gamma_single_16_to_8(r,display_red_gamma);
deco->barvicky[4]=apply_gamma_single_16_to_8(g,display_green_gamma);
deco->barvicky[5]=apply_gamma_single_16_to_8(b,display_blue_gamma);
}
/* vrati cislo, nebo -1, kdyz to neni cislo, a nastavi p a l na posledni necislici */
static inline int xbm_read_num(unsigned char **p,int *l,int *partnum,int *digits, int *base)
{
static int a=-1;
static int b=10;
static int d=0;
int retval;
int was_partnum=*partnum;
*partnum=0;
dalsi_runda:
if (!(*l))return a;
**p=tolower(**p);
if (!was_partnum&&b==10&&((**p)<'0'||(**p)>'9'))goto smitec; /* tohle neni cislo, to si strc nekam... */
if (b==16&&((**p)<'a'||(**p>'f'))&&((**p)<'0'||(**p)>'9'))goto smitec;
if (a==-1)a=0;
for (;*l&&(((**p)>='0'&&(**p)<='9')||(b==16&&(**p)>='a'&&(**p)<='f'));(*l)--,(*p)++){d++;a*=b;a+=((**p)>='a'?10+(**p)-'a':(**p)-'0');}
if (b==10&&!a&&(*l)&&((**p)|32)=='x'){b=16;d=0;(*p)++;(*l)--;if (!*l)*partnum=1;goto dalsi_runda;}
smitec:
retval=a;
if (!*l)*partnum=1;
else a=-1,*base=b,b=10,*digits=d,d=0;
return retval;
}
static inline void xbm_skip_space_tab(unsigned char **p, int *l)
{
for (;*l&&(**p==' '||**p==9);(*l)--,(*p)++)
;
}
static inline void xbm_skip_whitespace(unsigned char **p, int *l)
{
for (;*l&&((**p)>'9'||(**p)<'0');(*l)--,(*p)++)
;
}
static inline void put_eight(struct cached_image *cimg,int bits)
{
struct xbm_decoder *deco=(struct xbm_decoder *)cimg->decoder;
int ten_napis_v_s3_nekecal;
for (ten_napis_v_s3_nekecal=0;ten_napis_v_s3_nekecal<bits&&deco->image_pos<deco->pixels&&deco->line_pos<cimg->width;ten_napis_v_s3_nekecal++,deco->image_pos++,deco->line_pos++)
{
memcpy(cimg->buffer+deco->image_pos*3,deco->barvicky+((deco->actual_eight)&1)*3,3);
deco->actual_eight>>=1;
cimg->rows_added=1;
}
if (deco->line_pos==cimg->width)
deco->line_pos=0,deco->actual_eight=0;
}
/* opravdovy dekoder xbm, data jsou bez komentaru */
/* length is always !=NULL */
static int xbm_decode(struct cached_image *cimg, unsigned char *data, int length)
{
struct xbm_decoder *deco=(struct xbm_decoder *)cimg->decoder;
/* okurky v decu ;-) */
int a;
int must_return=0;
restart_again:
if (must_return&&!length)return 0;
must_return=0;
a=min(length,XBM_BUFFER_LEN-deco->buffer_pos);
memcpy(deco->buffer+deco->buffer_pos,data,a);
length-=a;
deco->buffer_pos+=a;
if (!deco->buffer_pos)return 0; /* z toho nic plodnyho nevznikne */
data+=a;
if (!deco->in_data_block&&deco->partnum)
{
unsigned char *p;
int a;
int b,d;
p=deco->buffer;
a=deco->buffer_pos;
*(deco->numdest)=xbm_read_num(&p,&a,&(deco->partnum),&d,&b);
/* p i a ukazuje na 1. neciselnej znak (at uz za mezerama bylo cislo nebo nebylo) */
memmove(deco->buffer,p,a);
deco->buffer_pos=a;
if (deco->partnum){must_return=1;goto restart_again;} /* zase konec bufferu */
}
if (deco->width<0||deco->height<0) /* decoding header */
{
unsigned char *p,*q;
int *d;
int a;
int base, digits;
p=my_memmem(deco->buffer,deco->buffer_pos,"width",5);
q=my_memmem(deco->buffer,deco->buffer_pos,"height",6);
if (!p&&!q) /* sezereme zacatek */
{
int a=deco->buffer_pos>5?deco->buffer_pos:0; /* nesmime ukrast kus width/height */
memmove(deco->buffer,deco->buffer+deco->buffer_pos-a,deco->buffer_pos-a); /* sezereme to pred width/height */
deco->buffer_pos-=a;
must_return=1;
goto restart_again;
}
p=p&&q?min(p,q):max(p,q); /* bereme vetsi, protoze ten 2. je NULL */
memmove(deco->buffer,p,(deco->buffer_pos)+(deco->buffer)-p); /* sezereme to pred width/height */
deco->buffer_pos-=p-deco->buffer;
/* deco->buffer zacina height/width */
if (deco->buffer[0]=='w'){p=deco->buffer+5;d=&(deco->width);}
else {p=deco->buffer+6;d=&(deco->height);}
a=deco->buffer_pos+deco->buffer-p;
xbm_skip_space_tab(&p,&a);
if (!a){must_return=1;goto restart_again;} /* v bufferu je: width/height, whitespace, konec */
*d=xbm_read_num(&p,&a,&(deco->partnum),&digits, &base);
if (deco->partnum)deco->numdest=d,must_return=1;
/* p i a ukazuje na 1. neciselnej znak (at uz za mezerama bylo cislo nebo nebylo) */
memmove(deco->buffer,p,a);
deco->buffer_pos=a;
goto restart_again;
}
else /* decoding data */
{
unsigned char *p;
int a;
int d=0,b=10;
if (!deco->in_data_block)
{
p=memchr(deco->buffer,'{',deco->buffer_pos);
if (!p){deco->buffer_pos=0;must_return=1;goto restart_again;} /* sezerem celej blok a cekame na zavorku */
cimg->width=deco->width;
cimg->height=deco->height;
cimg->buffer_bytes_per_pixel=3;
cimg->red_gamma=display_red_gamma;
cimg->green_gamma=display_green_gamma;
cimg->blue_gamma=display_blue_gamma;
cimg->strip_optimized=0;
if (header_dimensions_known(cimg)) {img_end(cimg);return 1;}
deco->in_data_block=1;
p++;
memmove(deco->buffer,p,deco->buffer_pos+deco->buffer-p); /* sezereme to pred width/height */
deco->buffer_pos-=p-deco->buffer;
deco->image_pos=0;
deco->pixels=deco->width*deco->height;
deco->line_pos=0;
}
p=deco->buffer;
a=deco->buffer_pos;
if (!deco->partnum) xbm_skip_whitespace(&p,&a);
if (!a){must_return=1; goto restart_again;}
deco->actual_eight=xbm_read_num(&p,&a,&(deco->partnum),&d,&b);
memmove(deco->buffer,p,a);
deco->buffer_pos=a;
if (deco->partnum)must_return=1;
else put_eight(cimg,(b==16&&d>2)||(b==10&&deco->actual_eight>255)?16:8);
if (deco->image_pos>=deco->pixels) {img_end(cimg);return 1;}
goto restart_again;
}
}
/* skip comments and call real decoding function */
void xbm_restart(struct cached_image *cimg, unsigned char *data, int length)
{
struct xbm_decoder *deco=(struct xbm_decoder*)cimg->decoder;
cycle_again:
if (!length)return;
switch(deco->state)
{
case 0: /* mimo komentar */
{
unsigned char *p;
p=memchr(data,'/',length);
if (!p){xbm_decode(cimg, data, length);return;}
if (xbm_decode(cimg, data, p-data)) return;
length-=p-data+1;
data=p+1; /* preskocim lomitko */
deco->state=1;
goto cycle_again;
}
case 1: /* za 1. lomitkem */
{
if (*data=='*'){deco->state=2;data++;length--;goto cycle_again;} /* zacal komentar */
if (xbm_decode(cimg, "/", 1)) return;
deco->state=0; /* to nebyl komentar */
goto cycle_again;
}
case 2: /* za lomeno hvezdicka (uvnitr komentare) */
{
unsigned char *p;
p=memchr(data,'*',length);
if (!p)return; /* furt komentar */
length-=p-data+1;
data=p+1; /* preskocim hvezdicku */
deco->state=3;
goto cycle_again;
}
case 3: /* za 2. hvezdickou */
{
if (*data=='/'){data++;length--;deco->state=0;goto cycle_again;} /* skoncil komentar */
deco->state=2;
data++;
length--;
goto cycle_again;
}
}
}
#endif /* G */
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