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use crate::datafile_parse::Item;
use crate::compression::compress;
use crate::convert::{To, TryTo};
use std::collections::HashMap;
use std::error;
use std::fmt;
use std::io;
use std::io::Write;
use std::borrow::Cow;
#[derive(Debug)]
pub struct SizeError {
size: u64,
}
impl fmt::Display for SizeError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Datafile of size {} is too large, max size: {}", self.size, i32::max_value())
}
}
impl error::Error for SizeError {}
#[derive(Debug)]
pub enum SaveError {
Io(io::Error),
Datafile(SizeError),
}
impl fmt::Display for SaveError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
SaveError::Io(e) => write!(f, "IO Error: {:?}", e),
SaveError::Datafile(err) => err.fmt(f),
}
}
}
impl error::Error for SaveError {}
impl From<io::Error> for SaveError {
fn from(err: io::Error) -> Self {
SaveError::Io(err)
}
}
impl From<SizeError> for SaveError {
fn from(err: SizeError) -> Self {
SaveError::Datafile(err)
}
}
impl Item {
fn len(&self) -> u64 {
(self.item_data.len().try_to::<u64>() + 2) * 4
}
fn write(&self, file: &mut dyn Write, type_id: u16) -> Result<(), SaveError> {
file.write_all(&u16::to_le_bytes(self.id))?;
file.write_all(&u16::to_le_bytes(type_id))?;
let size = self.item_data.len().try_to::<i32>() * 4;
file.write_all(&i32::to_le_bytes(size))?;
for &n in &self.item_data {
file.write_all(&i32::to_le_bytes(n))?;
}
Ok(())
}
}
pub fn save(output: &mut dyn Write, items: &HashMap<u16, Vec<Item>>, uncompressed_data_items: &[Cow<[u8]>]) -> Result<(), SaveError> {
check_items(items);
version_header(output)?;
let data_items: Vec<Vec<u8>> = uncompressed_data_items.iter()
.map(|data| compress(data))
.collect();
header(output, &items, &data_items)?;
item_types(output, &items)?;
item_offsets(output, &items)?;
data_offsets(output, &data_items)?;
data_sizes(output, uncompressed_data_items)?;
write_items(output, &items)?;
write_data_items(output, &data_items)?;
output.flush()?;
Ok(())
}
fn check_items(items: &HashMap<u16, Vec<Item>>) {
for (type_id, items_vec) in items {
if items_vec.len() == 0 {
panic!("Empty ItemTypes are not valid. Empty type id: {}", type_id);
}
}
}
fn version_header(file: &mut dyn Write) -> Result<(), SaveError> {
file.write_all(b"DATA")?;
file.write_all(&i32::to_le_bytes(4))?;
Ok(())
}
fn num_items(items: &HashMap<u16, Vec<Item>>) -> u64 {
let mut sum = 0;
for (_, items_vec) in items {
sum += items_vec.len().try_to::<u64>();
}
sum
}
fn item_size(items: &HashMap<u16, Vec<Item>>) -> u64 {
let mut sum = 0;
for (_, items_vec) in items {
for item in items_vec {
sum += item.len();
}
}
sum
}
fn data_size(data_items: &[Vec<u8>]) -> u64 {
let mut sum = 0;
for data_item in data_items {
sum += data_item.len().try_to::<u64>();
}
sum
}
fn header(file: &mut dyn Write, items: &HashMap<u16, Vec<Item>>, data_items: &[Vec<u8>]) -> Result<(), SaveError> {
let num_item_types = items.len().try_to::<u64>();
let num_items = num_items(items);
let num_data = data_items.len().try_to::<u64>();
let item_size = item_size(items);
let data_size = data_size(data_items);
let swap_len = (5 + num_item_types * 3 + num_items + num_data * 2) * 4 + item_size;
let size = swap_len + data_size;
if size > i32::MAX.try_to::<u64>() {
return Err(SizeError {
size,
}.into())
}
for &n in [size, swap_len, num_item_types, num_items, num_data, item_size, data_size].iter() {
file.write_all(&i32::to_le_bytes(n.try_to()))?;
}
Ok(())
}
fn item_types(file: &mut dyn Write, items: &HashMap<u16, Vec<Item>>) -> Result<(), SaveError> {
let mut start = 0;
let mut keys: Vec<&u16> = items.keys().collect();
keys.sort();
for key in keys {
let type_id = (*key).to::<i32>();
let num = items[&key].len().try_to::<i32>();
for &n in [type_id, start, num].iter() {
file.write_all(&i32::to_le_bytes(n))?;
}
start += num;
}
Ok(())
}
fn item_offsets(file: &mut dyn Write, items: &HashMap<u16, Vec<Item>>) -> Result<(), SaveError> {
let mut keys: Vec<&u16> = items.keys().collect();
keys.sort();
let mut start: i32 = 0;
for key in keys {
for item in items.get(key).unwrap() {
let size = item.len().try_to::<i32>();
file.write_all(&i32::to_le_bytes(start))?;
start += size;
}
}
Ok(())
}
fn data_offsets(file: &mut dyn Write, compressed_data_items: &[Vec<u8>]) -> Result<(), SaveError> {
let mut start: i32 = 0;
for compressed_data in compressed_data_items {
file.write_all(&i32::to_le_bytes(start))?;
start += compressed_data.len().try_to::<i32>();
}
Ok(())
}
fn data_sizes(file: &mut dyn Write, data_items: &[Cow<[u8]>]) -> Result<(), SaveError> {
for data_item in data_items {
let size = data_item.len().try_to::<i32>();
file.write_all(&i32::to_le_bytes(size))?;
}
Ok(())
}
fn write_items(file: &mut dyn Write, items: &HashMap<u16, Vec<Item>>) -> Result<(), SaveError> {
let mut keys: Vec<&u16> = items.keys().collect();
keys.sort();
for key in keys {
for item in items.get(key).unwrap() {
item.write(file, *key)?;
}
}
Ok(())
}
fn write_data_items(file: &mut dyn Write, data_items: &[Vec<u8>]) -> Result<(), SaveError> {
for data_item in data_items {
file.write_all(data_item)?;
}
Ok(())
}