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// MIT License, Copyright (c) 2020 Marvin Borner
// PSF parser
#include <def.h>
#include <print.h>
#include <psf.h>
#include <vesa.h>
// Verifies the PSF magics
// Returns the PSF version or 0
int psf_verify(char *data)
{
struct psf1_header *header1 = (struct psf1_header *)data;
struct psf2_header *header2 = (struct psf2_header *)data;
if (header1->magic[0] == PSF1_MAGIC_0 && header1->magic[1] == PSF1_MAGIC_1)
return 1;
else if (header2->magic[0] == PSF2_MAGIC_0 && header2->magic[1] == PSF2_MAGIC_1 &&
header2->magic[2] == PSF2_MAGIC_2 && header2->magic[3] == PSF2_MAGIC_3)
return 2;
else
return 0;
}
// Will be removed in the future
void psf_test(char *chars)
{
char ch = 'a';
int x = 50;
int y = 400;
const u32 c[3] = { 0xff, 0x00, 0x00 };
int font_height = 16;
int font_width = 8;
int pos = x * vbe_bpl + y * vbe_pitch;
char *draw = (char *)&fb[pos];
u16 row = 0;
for (int cy = 0; cy <= font_height; cy++) {
row = chars[ch * font_height + cy];
for (int cx = 0; cx <= font_width + 1; cx++) {
if (row & 0x80) {
draw[vbe_bpl * cx] = (char)c[2];
draw[vbe_bpl * cx + 1] = (char)c[1];
draw[vbe_bpl * cx + 2] = (char)c[0];
/* } else { */
/* draw[vbe_bpl * cx] = (char)c[2]; */
/* draw[vbe_bpl * cx + 1] = (char)terminal_background[1]; */
/* draw[vbe_bpl * cx + 2] = (char)terminal_background[0]; */
/* } */
}
row <<= 1;
}
draw += vbe_pitch;
}
}
char *psf_parse(char *data)
{
int version = psf_verify(data);
char *chars;
if (version == 1)
chars = data + sizeof(struct psf1_header);
else if (version == 2)
chars = data + sizeof(struct psf2_header);
else
return 0;
psf_test(chars);
return chars;
}
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