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use std::collections::HashMap;
use std::io::Read;
use std::mem;
use Config;
use Value;
use Buffer;
use Field;
use RpResult;
use ErrorKind;
use {TYPE_NIL, TYPE_U8, TYPE_I8, TYPE_U16, TYPE_I16, TYPE_U32, TYPE_I32, TYPE_FLOAT, TYPE_STR,
TYPE_RAW, TYPE_MAP};
use {TYPE_AU8, TYPE_AI8, TYPE_AU16, TYPE_AI16, TYPE_AU32, TYPE_AI32, TYPE_AFLOAT, TYPE_ASTR,
TYPE_ARAW, TYPE_AMAP};
use {get_name_by_type, get_type_by_name};
pub fn decode_number(buffer: &mut Buffer, pattern: u16) -> RpResult<Value> {
match pattern {
TYPE_U8 => {
let data: &mut [u8; 1] = &mut [0];
try_read!(buffer.read(data), data.len());
Ok(Value::from(data[0]))
}
TYPE_I8 => {
let data: &mut [u8; 1] = &mut [0];
try_read!(buffer.read(data), data.len());
Ok(Value::from(data[0] as i8))
}
TYPE_U16 => {
let data: &mut [u8; 2] = &mut [0, 0];
try_read!(buffer.read(data), data.len());
let val = unsafe { mem::transmute::<[u8; 2], u16>(*data) };
Ok(Value::from(u16::from_le(val)))
}
TYPE_I16 => {
let data: &mut [u8; 2] = &mut [0, 0];
try_read!(buffer.read(data), data.len());
let val = unsafe { mem::transmute::<[u8; 2], i16>(*data) };
Ok(Value::from(i16::from_le(val)))
}
TYPE_U32 => {
let data: &mut [u8; 4] = &mut [0, 0, 0, 0];
try_read!(buffer.read(data), data.len());
let val = unsafe { mem::transmute::<[u8; 4], u32>(*data) };
Ok(Value::from(u32::from_le(val)))
}
TYPE_I32 => {
let data: &mut [u8; 4] = &mut [0, 0, 0, 0];
try_read!(buffer.read(data), data.len());
let val = unsafe { mem::transmute::<[u8; 4], i32>(*data) };
Ok(Value::from(i32::from_le(val)))
}
TYPE_FLOAT => {
let data: &mut [u8; 4] = &mut [0, 0, 0, 0];
try_read!(buffer.read(data), data.len());
let val = unsafe { mem::transmute::<[u8; 4], i32>(*data) };
Ok(Value::from(val as f32 / 1000.0))
}
_ => {
unreachable!("not other numbers");
}
}
}
pub fn decode_str_raw(buffer: &mut Buffer, pattern: u16) -> RpResult<Value> {
match pattern {
TYPE_STR => {
let len: u16 = try!(decode_number(buffer, TYPE_U16)).into();
if len == 0 {
return Ok(Value::from(String::new()));
}
let mut rv = vec![0; len as usize];
try_read!(buffer.read(&mut rv[..]), len as usize);
let val = String::from_utf8(rv);
if val.is_err() {
fail!((ErrorKind::StringFormatError, "string format error"));
}
Ok(Value::from(val.ok().unwrap()))
}
TYPE_RAW => {
let len: u16 = try!(decode_number(buffer, TYPE_U16)).into();
if len == 0 {
return Ok(Value::from(vec![]))
}
let mut rv = vec![0; len as usize];
try_read!(buffer.read(&mut rv[..]), len as usize);
Ok(Value::from(rv))
}
_ => {
unreachable!("not other str");
}
}
}
pub fn decode_map(buffer: &mut Buffer, config: &Config) -> RpResult<Value> {
let mut map = HashMap::<String, Value>::new();
loop {
let field = try!(read_field(buffer));
if field.is_nil_type() {
return Ok(Value::from(map));
}
let sub_value = try!(decode_field(buffer, config));
let name = config.get_field_index_name(&field.index);
if name.is_none() {
continue;
}
let name = name.map(|s| s.clone()).unwrap();
map.insert(name, sub_value);
}
}
pub fn read_field(buffer: &mut Buffer) -> RpResult<Field> {
let index = try!(decode_number(buffer, TYPE_U16)).into();
let pattern = try!(decode_number(buffer, TYPE_U16)).into();
Ok(Field {
index: index,
pattern: get_name_by_type(pattern).to_string(),
})
}
fn decode_by_field(buffer: &mut Buffer, config: &Config, field: &Field) -> RpResult<Value> {
let t = get_type_by_name(&*field.pattern);
match t {
TYPE_U8 | TYPE_I8 | TYPE_U16 | TYPE_I16 | TYPE_U32 | TYPE_I32 | TYPE_FLOAT => {
decode_number(buffer, t)
}
TYPE_STR | TYPE_RAW => decode_str_raw(buffer, t),
TYPE_MAP => decode_map(buffer, config),
TYPE_AU8 => decode_array!(decode_field(buffer, config), Value::AU8, Value::U8),
TYPE_AI8 => decode_array!(decode_field(buffer, config), Value::AI8, Value::I8),
TYPE_AU16 => decode_array!(decode_field(buffer, config), Value::AU16, Value::U16),
TYPE_AI16 => decode_array!(decode_field(buffer, config), Value::AI16, Value::I16),
TYPE_AU32 => decode_array!(decode_field(buffer, config), Value::AU32, Value::U32),
TYPE_AI32 => decode_array!(decode_field(buffer, config), Value::AI32, Value::I32),
TYPE_AFLOAT => decode_array!(decode_field(buffer, config), Value::AFloat, Value::Float),
TYPE_ASTR => decode_array!(decode_field(buffer, config), Value::AStr, Value::Str),
TYPE_ARAW => decode_array!(decode_field(buffer, config), Value::ARaw, Value::Raw),
TYPE_AMAP => decode_array!(decode_field(buffer, config), Value::AMap, Value::Map),
TYPE_NIL => Ok(Value::Nil),
_ => fail!((ErrorKind::TypeNotMatchError, "must match type")),
}
}
pub fn decode_field(buffer: &mut Buffer, config: &Config) -> RpResult<Value> {
let field = try!(read_field(buffer));
if field.is_nil_type() {
return Ok(Value::Nil);
}
decode_by_field(buffer, config, &field)
}
pub fn decode_proto(buffer: &mut Buffer, config: &Config) -> RpResult<(String, Vec<Value>)> {
let name = try!(decode_str_raw(buffer, TYPE_STR)).into();
let mut value: Vec<Value> = vec![];
loop {
let sub_value = try!(decode_field(buffer, config));
match sub_value {
Value::Nil => break,
_ => (),
}
value.push(sub_value);
}
let proto = config.get_proto_by_name(&name);
match proto {
Some(val) => {
if val.args.len() != value.len() {
fail!((ErrorKind::TypeNotMatchError, "must match type"));
}
}
_ => {
fail!((ErrorKind::TypeNotMatchError, "must match type"));
}
}
Ok((name, value))
}