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// MIT License, Copyright (c) 2020 Marvin Borner
// PSF parser
#include <def.h>
#include <libgui/gfx.h>
#include <libgui/psf.h>
#include <mem.h>
#include <print.h>
// Verifies the PSF magics
// Returns the PSF version or 0
static 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;
}
struct gfx_font *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 {
print("Unknown font!\n");
return NULL;
}
struct gfx_font *font = malloc(sizeof(*font));
font->raw = data;
font->chars = chars;
font->size.x = width;
font->size.y = height;
font->char_size = char_size;
return font;
}
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