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#include "globals.h"
/* NOTE: integers are represented internally by unsigned long long ints, but in the save they are always 64 bits */
static uint32_t cksum;
#define ADD_CKSUM(x) (cksum += (x*x) + 1)
#define FAIL() fail("Failed to read from file.")
uint64_t read_be64(FILE *f)
{
uint64_t n;
if(fread(&n, sizeof(n), 1, f) != 1)
FAIL();
n = to_sys64(n);
ADD_CKSUM(n);
return n;
}
uint32_t read_be32(FILE *f)
{
uint32_t n;
if(fread(&n, sizeof(n), 1, f) != 1)
FAIL();
n = to_sys32(n);
ADD_CKSUM(n);
return n;
}
uint32_t read_be32_nocheck(FILE *f)
{
uint32_t n;
if(fread(&n, sizeof(n), 1, f) != 1)
FAIL();
n = to_sys32(n);
return n;
}
uint16_t read_be16(FILE *f)
{
uint16_t n;
if(fread(&n, sizeof(n), 1, f) != 1)
FAIL();
n = to_sys16(n);
ADD_CKSUM(n);
return n;
}
uint8_t read_int8(FILE *f)
{
uint8_t n;
if(fread(&n, sizeof(n), 1, f) != 1)
FAIL();
ADD_CKSUM(n);
return n;
}
/* this is SLOWWW, but who cares? :P */
size_t ck_read(char *buf, size_t sz, size_t nmemb, FILE* f)
{
for(size_t i = 0 ; i < sz * nmemb; ++i)
{
buf[i] = read_int8(f);
}
return nmemb;
}
void load_portfolio(struct player_t *player, const char *filename)
{
output("Loading portfolio...\n");
if(player->need_to_free_portfolio)
free(player->portfolio);
player->portfolio_len = 0;
player->portfolio = NULL;
cksum = 0;
FILE *f = fopen(filename, "rb");
char magic[MAGIC_LEN];
if(!f || ck_read(magic, 1, sizeof(magic), f) != 6 || memcmp(magic, SAVE_MAGIC, sizeof(magic)) != 0)
{
fail("Failed to load save.");
}
player->cash.cents = read_be64(f);
do {
/* read portfolio data */
player->portfolio_len += 1;
player->portfolio = realloc(player->portfolio, player->portfolio_len * sizeof(struct stock_t));
player->need_to_free_portfolio = true;
struct stock_t *stock = player->portfolio + player->portfolio_len - 1;
memset(stock, 0, sizeof(struct stock_t));
uint64_t symlen = read_be64(f);
char *sym = malloc(symlen + 1);
if(ck_read(sym, symlen + 1, 1, f) != 1)
{
fail("Save is corrupted (symbol too short).");
}
stock->symbol = sym;
stock->count = read_be64(f);
uint32_t histlen = read_be32(f);
/* load history */
if(histlen)
{
stock->history = malloc(histlen * sizeof(struct history_item));
struct history_item *hist = stock->history;
for(uint i = 0; i < histlen; ++i)
{
hist->action = read_be32(f);
hist->count = read_be64(f);
hist->price.cents = read_be64(f);
hist->action_time.year = read_be16(f);
hist->action_time.month = read_int8(f);
hist->action_time.day = read_int8(f);
hist->action_time.hour = read_int8(f);
hist->action_time.minute = read_int8(f);
hist->action_time.second = read_int8(f);
if(i + 1 < histlen)
hist->next = hist + 1;
else
hist->next = NULL;
++stock->history_len;
hist = hist->next;
}
}
uint32_t ck = read_be32_nocheck(f);
if(ck != cksum)
{
fail("Bad checksum, file is corrupt.\nCalculated: %d File: %d", ck, cksum);
}
int junk = fgetc(f);
ungetc(junk, f);
} while (!feof(f) && !ferror(f));
update_handler(player);
}
void load_handler(struct player_t *player)
{
output("Enter the file to load portfolio from: ");
char *filename = read_string();
load_portfolio(player, filename);
free(filename);
}
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