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use crate::message; use crate::wire::unmarshal; use crate::wire::unmarshal::UnmarshalResult; pub fn pad_to_align(align_to: usize, buf: &mut Vec<u8>) { let padding_needed = align_to - (buf.len() % align_to); if padding_needed != align_to { buf.resize(buf.len() + padding_needed, 0); assert!(buf.len() % align_to == 0); } } pub fn write_u16(val: u16, byteorder: message::ByteOrder, buf: &mut Vec<u8>) { match byteorder { message::ByteOrder::LittleEndian => buf.extend(&val.to_le_bytes()[..]), message::ByteOrder::BigEndian => buf.extend(&val.to_be_bytes()[..]), } } pub fn write_u32(val: u32, byteorder: message::ByteOrder, buf: &mut Vec<u8>) { match byteorder { message::ByteOrder::LittleEndian => buf.extend(&val.to_le_bytes()[..]), message::ByteOrder::BigEndian => buf.extend(&val.to_be_bytes()[..]), } } pub fn write_u64(val: u64, byteorder: message::ByteOrder, buf: &mut Vec<u8>) { match byteorder { message::ByteOrder::LittleEndian => buf.extend(&val.to_le_bytes()[..]), message::ByteOrder::BigEndian => buf.extend(&val.to_be_bytes()[..]), } } pub fn insert_u16(byteorder: message::ByteOrder, val: u16, buf: &mut [u8]) { match byteorder { message::ByteOrder::LittleEndian => { buf[0] = (val) as u8; buf[1] = (val >> 8) as u8; } message::ByteOrder::BigEndian => { buf[0] = (val >> 8) as u8; buf[1] = (val) as u8; } } } pub fn insert_u32(byteorder: message::ByteOrder, val: u32, buf: &mut [u8]) { match byteorder { message::ByteOrder::LittleEndian => { buf[0] = (val) as u8; buf[1] = (val >> 8) as u8; buf[2] = (val >> 16) as u8; buf[3] = (val >> 24) as u8; } message::ByteOrder::BigEndian => { buf[0] = (val >> 24) as u8; buf[1] = (val >> 16) as u8; buf[2] = (val >> 8) as u8; buf[3] = (val) as u8; } } } pub fn insert_u64(byteorder: message::ByteOrder, val: u64, buf: &mut [u8]) { match byteorder { message::ByteOrder::LittleEndian => { buf[0] = (val) as u8; buf[1] = (val >> 8) as u8; buf[2] = (val >> 16) as u8; buf[3] = (val >> 24) as u8; buf[4] = (val >> 32) as u8; buf[5] = (val >> 40) as u8; buf[6] = (val >> 48) as u8; buf[7] = (val >> 56) as u8; } message::ByteOrder::BigEndian => { buf[7] = (val) as u8; buf[6] = (val >> 8) as u8; buf[5] = (val >> 16) as u8; buf[4] = (val >> 24) as u8; buf[3] = (val >> 32) as u8; buf[2] = (val >> 40) as u8; buf[1] = (val >> 48) as u8; buf[0] = (val >> 56) as u8; } } } fn extend_with_memcopy(val: &str, buf: &mut Vec<u8>) { buf.reserve(val.len() + 1); unsafe { let target = buf.as_mut_ptr().add(buf.len()); std::ptr::copy(val.as_ptr(), target, val.len()); buf.set_len(buf.len() + val.len()); } } pub fn write_string(val: &str, byteorder: message::ByteOrder, buf: &mut Vec<u8>) { let len = val.len() as u32; write_u32(len, byteorder, buf); extend_with_memcopy(val, buf); buf.push(0); } pub fn write_signature(val: &str, buf: &mut Vec<u8>) { let len = val.len() as u8; buf.push(len); extend_with_memcopy(val, buf); buf.push(0); } pub fn parse_u64(number: &[u8], byteorder: message::ByteOrder) -> UnmarshalResult<u64> { if number.len() < 8 { return Err(unmarshal::Error::NotEnoughBytes); } let val = match byteorder { message::ByteOrder::LittleEndian => { (number[0] as u64) + ((number[1] as u64) << 8) + ((number[2] as u64) << 16) + ((number[3] as u64) << 24) + ((number[4] as u64) << 32) + ((number[5] as u64) << 40) + ((number[6] as u64) << 48) + ((number[7] as u64) << 56) } message::ByteOrder::BigEndian => { (number[7] as u64) + ((number[6] as u64) << 8) + ((number[5] as u64) << 16) + ((number[4] as u64) << 24) + ((number[3] as u64) << 32) + ((number[2] as u64) << 40) + ((number[1] as u64) << 48) + ((number[0] as u64) << 56) } }; Ok((8, val)) } pub fn parse_u32(number: &[u8], byteorder: message::ByteOrder) -> UnmarshalResult<u32> { if number.len() < 4 { return Err(unmarshal::Error::NotEnoughBytes); } let val = match byteorder { message::ByteOrder::LittleEndian => { (number[0] as u32) + ((number[1] as u32) << 8) + ((number[2] as u32) << 16) + ((number[3] as u32) << 24) } message::ByteOrder::BigEndian => { (number[3] as u32) + ((number[2] as u32) << 8) + ((number[1] as u32) << 16) + ((number[0] as u32) << 24) } }; Ok((4, val)) } pub fn parse_u16(number: &[u8], byteorder: message::ByteOrder) -> UnmarshalResult<u16> { if number.len() < 2 { return Err(unmarshal::Error::NotEnoughBytes); } let val = match byteorder { message::ByteOrder::LittleEndian => (number[0] as u16) + ((number[1] as u16) << 8), message::ByteOrder::BigEndian => (number[1] as u16) + ((number[0] as u16) << 8), }; Ok((2, val)) } pub fn align_offset(align_to: usize, buf: &[u8], offset: usize) -> Result<usize, unmarshal::Error> { let padding_delete = align_to - (offset % align_to); let padding_delete = if padding_delete == align_to { 0 } else { padding_delete }; if buf.len() < padding_delete { return Err(unmarshal::Error::NotEnoughBytes); } for x in 0..padding_delete { if buf[offset + x] != b'\0' { return Err(unmarshal::Error::PaddingContainedData); } } Ok(padding_delete) } pub fn unmarshal_signature(buf: &[u8]) -> UnmarshalResult<String> { if buf.is_empty() { return Err(unmarshal::Error::NotEnoughBytes); } let len = buf[0] as usize; if buf.len() < len + 2 { return Err(unmarshal::Error::NotEnoughBytes); } let sig_buf = &buf[1..]; let string = String::from_utf8(sig_buf[..len].to_vec()).map_err(|_| unmarshal::Error::InvalidUtf8)?; Ok((len + 2, string)) } pub fn unmarshal_string(byteorder: message::ByteOrder, buf: &[u8]) -> UnmarshalResult<String> { let len = parse_u32(buf, byteorder)?.1 as usize; if buf.len() < len + 5 { return Err(unmarshal::Error::NotEnoughBytes); } let str_buf = &buf[4..]; let string = String::from_utf8(str_buf[..len].to_vec()).map_err(|_| unmarshal::Error::InvalidUtf8)?; Ok((len + 5, string)) }