int load_huff_tables()
{
char aux;
int size, hclass, id, max;
int LeavesN, LeavesT, i;
int AuxCode;
size = get_size(); /* this is the tables' size */
size -= 2; //120 007A
while (size > 0) {
aux =FGETC();
hclass = first_quad(aux); /* AC or DC */
id = second_quad(aux); /* table no */
if (id > 1) {
//fprintf(stderr, "\tERROR:\tBad HTable identity %d!\n", id);
return -1;
}
id = HUFF_ID(hclass, id);
if (verbose);
//fprintf(stderr, "\tINFO:\tLoading Table %d\n", id);
size--;
LeavesT = 0;
AuxCode = 0;
for (i = 0; i < 16; i++) {
LeavesN = FGETC();
ValPtr[id][i] = LeavesT;
MinCode[id][i] = AuxCode * 2;
AuxCode = MinCode[id][i] + LeavesN;
MaxCode[id][i] = (LeavesN) ? (AuxCode - 1) : (-1);
LeavesT += LeavesN;
}
size -= 16;
if (LeavesT > MAX_SIZE(hclass)) {
max = MAX_SIZE(hclass);
//fprintf(stderr, "\tWARNING:\tTruncating Table by %d symbols\n", LeavesT - max);
} else
max = LeavesT;
for (i = 0; i < max; i++)
HTable[id][i] = FGETC(); /* load in raw order */
for (i = max; i < LeavesT; i++)
//fgetc(fi); /* skip if we don't load */
FGETC();
size -= LeavesT;
if (verbose);
//fprintf(stderr, "\tINFO:\tUsing %d words of table memory\n", LeavesT);
} /* loop on tables */
return 0;
}
int load_huff_tables()
{
char aux;
int size, hclass, id, max;
int LeavesN, LeavesT, i;
int AuxCode;
size = get_size(); /* this is the tables' size */
size -= 2; //120 007A
while (size > 0) {
aux =FGETC();
hclass = first_quad(aux); /* AC or DC */
id = second_quad(aux); /* table no */
if (id > 1) {
//fprintf(stderr, "\tERROR:\tBad HTable identity %d!\n", id);
return -1;
}
id = HUFF_ID(hclass, id);
size--;
LeavesT = 0;
AuxCode = 0;
for (i = 0; i < 16; i++) {
LeavesN = FGETC();
ValPtr[id][i] = LeavesT;
MinCode[id][i] = AuxCode * 2;
AuxCode = MinCode[id][i] + LeavesN;
MaxCode[id][i] = (LeavesN) ? (AuxCode - 1) : (-1);
LeavesT += LeavesN;
}
size -= 16;
if (LeavesT > MAX_SIZE(hclass)) {
max = MAX_SIZE(hclass);
} else
max = LeavesT;
for (i = 0; i < max; i++)
HTable[id][i] = FGETC(); /* load in raw order */
for (i = max; i < LeavesT; i++)
FGETC();
size -= LeavesT;
} /* loop on tables */
return 0;
}
unsigned char get_symbol(int select) {
long code = 0;
int length;
int index;
for (length = 0; length < 16; length++) {
code = (2 * code) | get_one_bit();
if (code <= MaxCode[select][length]) { break; }
}
index = ValPtr[select][length] + code - MinCode[select][length];
if (index < MAX_SIZE(select / 2)) { return HTable[select][index]; }
ERR("%ld:\tWARNING:\tOverflowing symbol table !\n", FTELL());
return 0;
}
unsigned char get_symbol( int select)
{
long code = 0;
int length;
int index;
for (length = 0; length < 16; length++) {
code = (2 * code) | get_one_bit();
if (code <= MaxCode[select][length])
break;
}
index = ValPtr[select][length] + code - MinCode[select][length];
if (index < MAX_SIZE(select / 2))
return HTable[select][index];
//fprintf(stderr, "%ld:\tWARNING:\tOverflowing symbol table !\n", ftell(fi));
return 0;
}
/*-----------------------------------------*/
#include "jpeg.h"
/*--------------------------------------*/
/* private huffman.c defines and macros */
/*--------------------------------------*/
/* Memory size of HTables; */
#define MAX_SIZE(hclass) ((hclass)?162:14)
/*--------------------------------------*/
/* some static structures for storage */
/*--------------------------------------*/
static unsigned char DC_Table0[MAX_SIZE(DC_CLASS)], DC_Table1[MAX_SIZE(DC_CLASS)];
static unsigned char AC_Table0[MAX_SIZE(AC_CLASS)], AC_Table1[MAX_SIZE(AC_CLASS)];
static unsigned char *HTable[4] = {
&DC_Table0[0], &DC_Table1[0],
&AC_Table0[0], &AC_Table1[0]
};
static int MinCode[4][16];
static int MaxCode[4][16];
static int ValPtr[4][16];
/*----------------------------------------------------------*/
/* Loading of Huffman table, with leaves drop ability */
/*----------------------------------------------------------*/
// Very simple menu with a heading and a scrolling banner as a footer
char plat_Menu(char **menuItems, char height, char *scroller)
{
static char *prevScroller, *pScroller, *pEnd;
int keyMask;
char i, j, sx, sy, numMenuItems, timerInit = 0, maxLen = 0;
// If the scroller message chages, cache the new one
if(prevScroller != scroller)
{
prevScroller = scroller;
pScroller = scroller;
pEnd = scroller + strlen(scroller);
}
// Find the longest entry
for(numMenuItems=0; menuItems[numMenuItems]; ++numMenuItems)
{
char len = strlen(menuItems[numMenuItems]);
if(len > maxLen)
maxLen = len;
}
// Centre on the screen
sy = MAX_SIZE(0, (SCREEN_HEIGHT / 2) - (height / 2) - 1);
sx = MAX_SIZE(0, (SCREEN_WIDTH / 2) - (maxLen / 2) - 1);
maxLen = MIN_SIZE(SCREEN_WIDTH-2, maxLen);
// Show the title
textcolor(COLOR_GREEN);
gotoxy(sx, sy);
cprintf(" %.*s ",maxLen, menuItems[0]);
// Leave a blank line
textcolor(COLOR_BLACK);
gotoxy(sx, ++sy);
for(j=0; j<maxLen+2; ++j)
cputc(' ');
// Show all the menu items
for(i=1; i<numMenuItems; ++i)
{
gotoxy(sx, sy+i);
cprintf(" %.*s ",maxLen, menuItems[i]);
}
// Pad with blank lines to menu height
for(;i<height;++i)
{
gotoxy(sx, sy+i);
for(j=0; j<maxLen+2; ++j)
cputc(' ');
}
// Select the first item
i = 1;
do
{
// Highlight the selected item
gotoxy(sx, sy+i);
textcolor(COLOR_WHITE);
cprintf(">%.*s<",maxLen, menuItems[i]);
textcolor(COLOR_BLACK);
// Look for user input
keyMask = plat_ReadKeys(0);
if(keyMask & INPUT_MOTION)
{
// selection changes so de-highlight the selected item
gotoxy(sx, sy+i);
cprintf(" %.*s ",maxLen, menuItems[i]);
// see if the selection goes up or down
switch(keyMask & INPUT_MOTION)
{
case INPUT_UP:
if(!--i)
i = numMenuItems-1;
break;
case INPUT_DOWN:
if(numMenuItems == ++i)
i = 1;
break;
}
}
keyMask &= (INPUT_SELECT | INPUT_BACKUP);
// Show the scroller
gotoxy(sx,sy+height);
textcolor(COLOR_CYAN);
cprintf(" %.*s ",maxLen, pScroller);
// Wrap the message if needed
if((pEnd - pScroller) < maxLen-1)
{
gotoxy(sx+(pEnd-pScroller)+1,sy+height);
cprintf(" %.*s ",maxLen-(pEnd - pScroller)-1, scroller);
}
// Only update the scrolling when needed
if(plat_TimeExpired(SCROLL_SPEED, &timerInit))
{
++pScroller;
if(!*pScroller)
pScroller = scroller;
}
} while(keyMask != INPUT_SELECT && keyMask != INPUT_BACKUP);
// if backing out of the menu, return 0
if(keyMask & INPUT_BACKUP)
return 0;
// return the selection
return i;
}