#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "misc.h"
#include "defines.h"
#include "interface.h"
#include "graphics.h"

//Signum function
#if defined(WIN32) && !defined(__GNUC__)
_inline int isign(float i)
#else
inline int isign(float i)
#endif
{
	if (i<0)
		return -1;
	if (i>0)
		return 1;
	return 0;
}

#if defined(WIN32) && !defined(__GNUC__)
_inline unsigned clamp_flt(float f, float min, float max)
#else
inline unsigned clamp_flt(float f, float min, float max)
#endif
{
	if (f<min)
		return 0;
	if (f>max)
		return 255;
	return (int)(255.0f*(f-min)/(max-min));
}

#if defined(WIN32) && !defined(__GNUC__)
_inline float restrict_flt(float f, float min, float max)
#else
inline float restrict_flt(float f, float min, float max)
#endif
{
	if (f<min)
		return min;
	if (f>max)
		return max;
	return f;
}

char *mystrdup(char *s)
{
	char *x;
	if (s)
	{
		x = (char*)malloc(strlen(s)+1);
		strcpy(x, s);
		return x;
	}
	return s;
}

void strlist_add(struct strlist **list, char *str)
{
	struct strlist *item = malloc(sizeof(struct strlist));
	item->str = mystrdup(str);
	item->next = *list;
	*list = item;
}

int strlist_find(struct strlist **list, char *str)
{
	struct strlist *item;
	for (item=*list; item; item=item->next)
		if (!strcmp(item->str, str))
			return 1;
	return 0;
}

void strlist_free(struct strlist **list)
{
	struct strlist *item;
	while (*list)
	{
		item = *list;
		*list = (*list)->next;
		free(item);
	}
}

void save_presets(int do_update)
{
	FILE *f=fopen("powder.def", "wb");
	unsigned char sig[4] = {0x50, 0x44, 0x65, 0x66};
	unsigned char tmp = sdl_scale;
	if (!f)
		return;
	fwrite(sig, 1, 4, f);
	save_string(f, svf_user);
	save_string(f, svf_pass);
	fwrite(&tmp, 1, 1, f);
	tmp = cmode;
	fwrite(&tmp, 1, 1, f);
	tmp = svf_admin;
	fwrite(&tmp, 1, 1, f);
	tmp = svf_mod;
	fwrite(&tmp, 1, 1, f);
	save_string(f, http_proxy_string);
	tmp = SAVE_VERSION;
	fwrite(&tmp, 1, 1, f);
	tmp = MINOR_VERSION;
	fwrite(&tmp, 1, 1, f);
	tmp = do_update;
	fwrite(&tmp, 1, 1, f);
	fclose(f);
}

void load_presets(void)
{
	FILE *f=fopen("powder.def", "rb");
	unsigned char sig[4], tmp;
	if (!f)
		return;
	fread(sig, 1, 4, f);
	if (sig[0]!=0x50 || sig[1]!=0x44 || sig[2]!=0x65 || sig[3]!=0x66)
	{
		if (sig[0]==0x4D && sig[1]==0x6F && sig[2]==0x46 && sig[3]==0x6F)
		{
			if (fseek(f, -3, SEEK_END))
			{
				remove("powder.def");
				return;
			}
			if (fread(sig, 1, 3, f) != 3)
			{
				remove("powder.def");
				goto fail;
			}
			last_major = sig[0];
			last_minor = sig[1];
			update_flag = sig[2];
		}
		fclose(f);
		remove("powder.def");
		return;
	}
	if (load_string(f, svf_user, 63))
		goto fail;
	if (load_string(f, svf_pass, 63))
		goto fail;
	svf_login = !!svf_user[0];
	if (fread(&tmp, 1, 1, f) != 1)
		goto fail;
	sdl_scale = (tmp == 2) ? 2 : 1;
	if (fread(&tmp, 1, 1, f) != 1)
		goto fail;
	cmode = tmp%7;
	if (fread(&tmp, 1, 1, f) != 1)
		goto fail;
	svf_admin = tmp;
	if (fread(&tmp, 1, 1, f) != 1)
		goto fail;
	svf_mod = tmp;
	if (load_string(f, http_proxy_string, 255))
		goto fail;
	if (fread(sig, 1, 3, f) != 3)
		goto fail;
	last_major = sig[0];
	last_minor = sig[1];
	update_flag = sig[2];
fail:
	fclose(f);
}

void save_string(FILE *f, char *str)
{
	int li = strlen(str);
	unsigned char lb[2];
	lb[0] = li;
	lb[1] = li >> 8;
	fwrite(lb, 2, 1, f);
	fwrite(str, li, 1, f);
}

int load_string(FILE *f, char *str, int max)
{
	int li;
	unsigned char lb[2];
	fread(lb, 2, 1, f);
	li = lb[0] | (lb[1] << 8);
	if (li > max)
	{
		str[0] = 0;
		return 1;
	}
	fread(str, li, 1, f);
	str[li] = 0;
	return 0;
}

void strcaturl(char *dst, char *src)
{
	char *d;
	unsigned char *s;

	for (d=dst; *d; d++) ;

	for (s=(unsigned char *)src; *s; s++)
	{
		if ((*s>='0' && *s<='9') ||
		        (*s>='a' && *s<='z') ||
		        (*s>='A' && *s<='Z'))
			*(d++) = *s;
		else
		{
			*(d++) = '%';
			*(d++) = hex[*s>>4];
			*(d++) = hex[*s&15];
		}
	}
	*d = 0;
}

void strappend(char *dst, char *src)
{
	char *d;
	unsigned char *s;

	for (d=dst; *d; d++) ;

	for (s=(unsigned char *)src; *s; s++)
	{
		*(d++) = *s;
	}
	*d = 0;
}

void *file_load(char *fn, int *size)
{
	FILE *f = fopen(fn, "rb");
	void *s;

	if (!f)
		return NULL;
	fseek(f, 0, SEEK_END);
	*size = ftell(f);
	fseek(f, 0, SEEK_SET);
	s = malloc(*size);
	if (!s)
	{
		fclose(f);
		return NULL;
	}
	fread(s, *size, 1, f);
	fclose(f);
	return s;
}

int cpu_check(void)
{
#ifdef MACOSX
	return 0;
#else
#ifdef X86
	unsigned af,bf,cf,df;
	x86_cpuid(0, af, bf, cf, df);
	if (bf==0x68747541 && cf==0x444D4163 && df==0x69746E65)
		amd = 1;
	x86_cpuid(1, af, bf, cf, df);
#ifdef X86_SSE
	if (!(df&(1<<25)))
		return 1;
#endif
#ifdef X86_SSE2
	if (!(df&(1<<26)))
		return 1;
#endif
#ifdef X86_SSE3
	if (!(cf&1))
		return 1;
#endif
#endif
#endif
	return 0;
}