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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include "../util.h"
#include "../paths.h"
#include "sfnt.h"
typedef enum {
STATE_DEFAULT,
STATE_DECL,
STATE_COMMENT,
STATE_TAG,
STATE_PRE_ATTRIB,
STATE_ATTRIB,
STATE_PRE_VALUE,
STATE_VALUE
} parse_state;
#define DEFAULT_WEIGHT 400
char *default_font_path(void)
{
//Would probably be better to call into Java for this, but this should do for now
FILE *f = fopen("/system/etc/fonts.xml", "rb");
if (!f) {
return NULL;
}
long size = file_size(f);
char *font_xml = malloc(size+1);
if (size != fread(font_xml, 1, size, f)) {
free(font_xml);
fclose(f);
return NULL;
}
fclose(f);
font_xml[size] = 0;
char *last_tag = NULL, *last_attrib = NULL, *last_value = NULL;
uint8_t last_style_was_normal = 0;
char *capture_best = NULL;
char *best = NULL;
int best_weight_diff = INT_MAX;
int last_weight = INT_MAX;
parse_state state = STATE_DEFAULT;
for(char *cur = font_xml; *cur; ++cur) {
switch (state)
{
case STATE_DEFAULT:
if (*cur == '<' && cur[1]) {
cur++;
switch(*cur)
{
case '?':
state = STATE_DECL;
break;
case '!':
if (cur[1] == '-' && cur[2] == '-') {
state = STATE_COMMENT;
cur++;
} else {
debug_message("Invalid comment\n");
cur = font_xml + size - 1;
}
break;
default:
if (capture_best) {
cur[-1] = 0;
best = strip_ws(capture_best);
capture_best = NULL;
best_weight_diff = abs(last_weight - DEFAULT_WEIGHT);
debug_message("Found candidate %s with weight %d\n", best, last_weight);
}
state = STATE_TAG;
last_tag = cur;
last_attrib = NULL;
last_value = NULL;
last_weight = INT_MAX;
break;
}
}
break;
case STATE_DECL:
if (*cur == '?' && cur[1] == '>') {
cur++;
state = STATE_DEFAULT;
}
break;
case STATE_COMMENT:
if (*cur == '-' && cur[1] == '-' && cur[2] == '>') {
cur += 2;
state = STATE_DEFAULT;
}
break;
case STATE_TAG:
if (*cur == ' ' || *cur == '\t' || *cur == '\n' || *cur == '\r') {
*cur = 0;
state = STATE_PRE_ATTRIB;
} else if (*cur == '>') {
*cur = 0;
state = STATE_DEFAULT;
}
break;
case STATE_PRE_ATTRIB:
if (!(*cur == ' ' || *cur == '\t' || *cur == '\n' || *cur == '\r')) {
if (*cur == '>') {
state = STATE_DEFAULT;
if (last_style_was_normal && abs(last_weight - DEFAULT_WEIGHT) < best_weight_diff) {
capture_best = cur + 1;
} else if (best && !strcmp("/family", last_tag)) {
debug_message("found family close tag, stopping search\n");
cur = font_xml + size - 1;
}
} else {
last_attrib = cur;
state = STATE_ATTRIB;
}
}
break;
case STATE_ATTRIB:
if (*cur == '=') {
*cur = 0;
state = STATE_PRE_VALUE;
} else if (*cur == ' ' || *cur == '\t' || *cur == '\n' || *cur == '\r') {
*cur = 0;
}
break;
case STATE_PRE_VALUE:
if (*cur == '"') {
state = STATE_VALUE;
last_value = cur + 1;
}
break;
case STATE_VALUE:
if (*cur == '"') {
*cur = 0;
state = STATE_PRE_ATTRIB;
if (!strcmp("weight", last_attrib)) {
last_weight = atoi(last_value);
} else if (!strcmp("style", last_attrib)) {
last_style_was_normal = !strcmp("normal", last_value);
}
}
break;
}
}
if (best) {
best = path_append("/system/fonts", best);
}
free(font_xml);
return best;
}
static uint8_t *try_load_font(char *path, uint32_t *size_out)
{
debug_message("Trying to load font %s\n", path);
FILE *f = fopen(path, "rb");
free(path);
if (!f) {
return NULL;
}
long size = file_size(f);
uint8_t *buffer = malloc(size);
if (size != fread(buffer, 1, size, f)) {
fclose(f);
return NULL;
}
fclose(f);
sfnt_container *sfnt = load_sfnt(buffer, size);
if (!sfnt) {
free(buffer);
return NULL;
}
return sfnt_flatten(sfnt->tables, size_out);
}
uint8_t *default_font(uint32_t *size_out)
{
char *path = default_font_path();
if (!path) {
goto error;
}
uint8_t *ret = try_load_font(path, size_out);
if (ret) {
return ret;
}
error:
//try some likely suspects if we failed to parse fonts.xml or failed to find the indicated font
ret = try_load_font("/system/fonts/Roboto-Regular.ttf", size_out);
if (!ret) {
ret = try_load_font("/system/fonts/DroidSans.ttf", size_out);
}
return ret;
}
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