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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, int height, int width, int char_size)
{
char ch = 'a';
int x = 0;
int y = 0;
const u32 c[3] = { 0xff, 0x00, 0x00 };
printf("%d %d %d\n", height, width, char_size);
int pos = x * vbe_bpl + y * vbe_pitch;
char *draw = (char *)&fb[pos];
u32 stride = char_size / height;
for (int cy = 0; cy < height; cy++) {
for (int cx = 0; cx < width; cx++) {
u8 bits = chars[ch * char_size + cy * stride + cx / 8];
u8 bit = bits >> (7 - cx % 8) & 1;
if (bit) {
draw[vbe_bpl * cx] = (char)c[2];
draw[vbe_bpl * cx + 1] = (char)c[1];
draw[vbe_bpl * cx + 2] = (char)c[0];
}
}
draw += vbe_pitch;
}
}
char *psf_parse(char *data)
{
int version = psf_verify(data);
char *chars;
int height;
int width;
int char_size;
if (version == 1) {
chars = data + sizeof(struct psf1_header);
height = ((struct psf1_header *)data)->char_size;
width = 8;
char_size = ((struct psf1_header *)data)->char_size;
} else if (version == 2) {
chars = data + ((struct psf2_header *)data)->size;
height = ((struct psf2_header *)data)->height;
width = ((struct psf2_header *)data)->width;
char_size = ((struct psf2_header *)data)->char_size;
} else {
return 0;
}
psf_test(chars, height, width, char_size);
return chars;
}
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