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use std::collections::HashMap;
use amqp_error::{AMQPError, AMQPResult};
use std::io::{Read, Write};
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
#[derive(Debug, Clone, PartialEq)]
pub enum TableEntry {
Bool(bool),
ShortShortInt(i8),
ShortShortUint(u8),
ShortInt(i16),
ShortUint(u16),
LongInt(i32),
LongUint(u32),
LongLongInt(i64),
LongLongUint(u64),
Float(f32),
Double(f64),
DecimalValue(u8, u32),
LongString(String),
FieldArray(Vec<TableEntry>),
Timestamp(u64),
FieldTable(Table),
Void,
}
pub type Table = HashMap<String, TableEntry>;
pub trait Init {
fn new() -> Self;
}
impl Init for Table {
fn new() -> Self {
HashMap::new()
}
}
fn read_table_entry<T>(reader: &mut T) -> AMQPResult<(TableEntry, usize)> where T: Read {
let (entry, entry_size) = match try!(reader.read_u8()) {
b't' => (TableEntry::Bool(!try!(reader.read_u8()) != 0), 1),
b'b' => (TableEntry::ShortShortInt(try!(reader.read_i8())), 1),
b'B' => (TableEntry::ShortShortUint(try!(reader.read_u8())), 1),
b'U' => (TableEntry::ShortInt(try!(reader.read_i16::<BigEndian>())), 2),
b'u' => (TableEntry::ShortUint(try!(reader.read_u16::<BigEndian>())), 2),
b'I' => (TableEntry::LongInt(try!(reader.read_i32::<BigEndian>())), 4),
b'i' => (TableEntry::LongUint(try!(reader.read_u32::<BigEndian>())), 4),
b'L' => (TableEntry::LongLongInt(try!(reader.read_i64::<BigEndian>())), 8),
b'l' => (TableEntry::LongLongUint(try!(reader.read_u64::<BigEndian>())), 8),
b'f' => (TableEntry::Float(try!(reader.read_f32::<BigEndian>())), 4),
b'd' => (TableEntry::Double(try!(reader.read_f64::<BigEndian>())), 8),
b'D' => ({
TableEntry::DecimalValue(try!(reader.read_u8()), try!(reader.read_u32::<BigEndian>()))
}, 5),
b'S' => {
let size = try!(reader.read_u32::<BigEndian>()) as usize;
let mut buffer: Vec<u8> = vec![0u8; size];
try!(reader.read(&mut buffer[..]));
let string = String::from_utf8_lossy(&buffer).to_string();
let entry = TableEntry::LongString(string);
(entry, 4 + size)
},
b'A' => {
let array_len = try!(reader.read_u32::<BigEndian>()) as usize;
let mut read_len = 0;
let mut arr = Vec::new();
while read_len < array_len {
let (entry, entry_len) = try!(read_table_entry(reader));
read_len += entry_len;
arr.push(entry)
}
let entry = TableEntry::FieldArray(arr);
(entry, 4 + array_len)
},
b'T' => (TableEntry::Timestamp(try!(reader.read_u64::<BigEndian>())), 8),
b'F' => {
let (table, table_size) = try!(decode_table(reader));
let entry = TableEntry::FieldTable(table);
(entry, table_size)
},
b'V' => (TableEntry::Void, 0),
x => {
debug!("Unknown type: {}", x);
return Err(AMQPError::DecodeError("Unknown type"));
}
};
Ok((entry, entry_size + 1))
}
fn write_table_entry(writer: &mut Vec<u8>, table_entry: &TableEntry) -> AMQPResult<()> {
match *table_entry {
TableEntry::Bool(val) => {
try!(writer.write_u8(b't'));
try!(writer.write_u8(val as u8));
}
TableEntry::ShortShortInt(val) => {
try!(writer.write_u8(b'b'));
try!(writer.write_i8(val));
}
TableEntry::ShortShortUint(val) => {
try!(writer.write_u8(b'B'));
try!(writer.write_u8(val));
}
TableEntry::ShortInt(val) => {
try!(writer.write_u8(b'U'));
try!(writer.write_i16::<BigEndian>(val));
}
TableEntry::ShortUint(val) => {
try!(writer.write_u8(b'u'));
try!(writer.write_u16::<BigEndian>(val));
}
TableEntry::LongInt(val) => {
try!(writer.write_u8(b'I'));
try!(writer.write_i32::<BigEndian>(val));
}
TableEntry::LongUint(val) => {
try!(writer.write_u8(b'i'));
try!(writer.write_u32::<BigEndian>(val));
}
TableEntry::LongLongInt(val) => {
try!(writer.write_u8(b'L'));
try!(writer.write_i64::<BigEndian>(val));
}
TableEntry::LongLongUint(val) => {
try!(writer.write_u8(b'l'));
try!(writer.write_u64::<BigEndian>(val));
}
TableEntry::Float(val) => {
try!(writer.write_u8(b'f'));
try!(writer.write_f32::<BigEndian>(val));
}
TableEntry::Double(val) => {
try!(writer.write_u8(b'd'));
try!(writer.write_f64::<BigEndian>(val));
}
TableEntry::DecimalValue(scale, value) => {
try!(writer.write_u8(b'D'));
try!(writer.write_u8(scale));
try!(writer.write_u32::<BigEndian>(value));
}
TableEntry::LongString(ref str) => {
try!(writer.write_u8(b'S'));
try!(writer.write_u32::<BigEndian>(str.len() as u32));
try!(writer.write_all(str.as_bytes()));
}
TableEntry::FieldArray(ref arr) => {
try!(writer.write_u8(b'A'));
let mut tmp_buffer = vec![];
for item in arr.iter() {
try!(write_table_entry(&mut tmp_buffer, item));
}
try!(writer.write_u32::<BigEndian>(tmp_buffer.len() as u32));
try!(writer.write(&tmp_buffer));
}
TableEntry::Timestamp(val) => {
try!(writer.write_u8(b'T'));
try!(writer.write_u64::<BigEndian>(val))
}
TableEntry::FieldTable(ref table) => {
try!(writer.write_u8(b'F'));
try!(encode_table(writer, table));
}
TableEntry::Void => try!(writer.write_u8(b'V')),
}
Ok(())
}
pub fn decode_table<T>(reader: &mut T) -> AMQPResult<(Table, usize)> where T: Read {
let mut table = Table::new();
let table_len = try!(reader.read_u32::<BigEndian>()) as usize;
debug!("decoding table, len: {}", table_len);
let mut bytes_read = 0;
while bytes_read < table_len {
let field_name_len = try!(reader.read_u8()) as usize;
let mut field_name: Vec<u8> = vec![0u8; field_name_len];
try!(reader.read(&mut field_name[..]));
let (table_entry, table_entry_size) = try!(read_table_entry(reader));
let stringified_field_name = String::from_utf8_lossy(&field_name).to_string();
debug!("Read table entry: {:?}:{} = {:?}", stringified_field_name, table_entry_size, table_entry);
table.insert(stringified_field_name, table_entry);
bytes_read += 1 + field_name_len + table_entry_size;
debug!("bytes_read: {} of {}", bytes_read, table_len);
}
debug!("table decoded, table len: {}, bytes_read: {}", table_len, bytes_read);
Ok((table, bytes_read + 4))
}
pub fn encode_table<T: Write>(writer: &mut T, table: &Table) -> AMQPResult<()> {
let mut tmp_buffer = vec![];
for (field_name, table_entry) in table.iter() {
try!(tmp_buffer.write_u8(field_name.len() as u8));
try!(tmp_buffer.write_all(field_name.as_bytes()));
try!(write_table_entry(&mut tmp_buffer, table_entry));
}
try!(writer.write_u32::<BigEndian>(tmp_buffer.len() as u32));
try!(writer.write_all(&tmp_buffer));
Ok(())
}