Implement the encoder for the field values.
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KAMADA Ken'ichi
parent
a49a8be441
commit
132c9e9d18
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@ -76,3 +76,4 @@ mod tag_priv;
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mod tiff;
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mod util;
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mod value;
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mod writer;
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@ -0,0 +1,174 @@
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//
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// Copyright (c) 2017 KAMADA Ken'ichi.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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//
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use std::mem;
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use std::slice;
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use endian::{Endian, BigEndian, LittleEndian};
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use error::Error;
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use value::Value;
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// Returns the type, count, and encoded value.
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fn compose_value<E>(value: &Value)
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-> Result<(u16, usize, Vec<u8>), Error> where E: Endian {
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match *value {
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Value::Byte(ref vec) =>
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Ok((1, vec.len(), vec.clone())),
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Value::Ascii(ref vec) => {
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let mut buf = Vec::new();
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for &s in vec {
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buf.extend_from_slice(s);
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buf.push(0);
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}
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Ok((2, buf.len(), buf))
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},
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Value::Short(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu16(&mut buf, v));
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}
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Ok((3, vec.len(), buf))
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},
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Value::Long(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu32(&mut buf, v));
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}
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Ok((4, vec.len(), buf))
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},
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Value::Rational(ref vec) => {
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let mut buf = Vec::new();
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for v in vec {
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try!(E::writeu32(&mut buf, v.num));
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try!(E::writeu32(&mut buf, v.denom));
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}
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Ok((5, vec.len(), buf))
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},
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Value::SByte(ref vec) => {
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let uslice = unsafe { slice::from_raw_parts(
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vec.as_ptr() as *const u8, vec.len()) };
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Ok((6, vec.len(), uslice.to_vec()))
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},
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Value::Undefined(ref s) =>
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Ok((7, s.len(), s.to_vec())),
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Value::SShort(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu16(&mut buf, v as u16));
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}
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Ok((8, vec.len(), buf))
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},
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Value::SLong(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu32(&mut buf, v as u32));
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}
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Ok((9, vec.len(), buf))
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},
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Value::SRational(ref vec) => {
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let mut buf = Vec::new();
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for v in vec {
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try!(E::writeu32(&mut buf, v.num as u32));
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try!(E::writeu32(&mut buf, v.denom as u32));
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}
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Ok((10, vec.len(), buf))
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},
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Value::Float(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu32(&mut buf, unsafe { mem::transmute(v) }));
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}
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Ok((11, vec.len(), buf))
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},
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Value::Double(ref vec) => {
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let mut buf = Vec::new();
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for &v in vec {
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try!(E::writeu64(&mut buf, unsafe { mem::transmute(v) }));
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}
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Ok((12, vec.len(), buf))
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},
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Value::Unknown(_, _, _) =>
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Err(Error::InvalidFormat("Cannot write unknown field types")),
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}
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}
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#[cfg(test)]
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mod tests {
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use value::{Rational, SRational};
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use super::*;
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#[test]
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fn compose_field_value() {
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let patterns = vec![
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(Value::Byte(vec![1, 2]),
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(1, 2, vec![1, 2]),
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(1, 2, vec![1, 2])),
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(Value::Ascii(vec![b"a", b"b"]),
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(2, 4, b"a\0b\0".to_vec()),
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(2, 4, b"a\0b\0".to_vec())),
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(Value::Short(vec![0x0102, 0x0304]),
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(3, 2, b"\x01\x02\x03\x04".to_vec()),
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(3, 2, b"\x02\x01\x04\x03".to_vec())),
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(Value::Long(vec![0x01020304, 0x05060708]),
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(4, 2, b"\x01\x02\x03\x04\x05\x06\x07\x08".to_vec()),
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(4, 2, b"\x04\x03\x02\x01\x08\x07\x06\x05".to_vec())),
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(Value::Rational(vec![Rational { num: 1, denom: 2},
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Rational { num: 3, denom: 4}]),
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(5, 2, b"\0\0\0\x01\0\0\0\x02\0\0\0\x03\0\0\0\x04".to_vec()),
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(5, 2, b"\x01\0\0\0\x02\0\0\0\x03\0\0\0\x04\0\0\0".to_vec())),
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(Value::SByte(vec![-2, -128]),
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(6, 2, b"\xfe\x80".to_vec()),
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(6, 2, b"\xfe\x80".to_vec())),
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(Value::Undefined(b"abc"),
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(7, 3, b"abc".to_vec()),
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(7, 3, b"abc".to_vec())),
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(Value::SShort(vec![-2, -0x8000]),
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(8, 2, b"\xff\xfe\x80\x00".to_vec()),
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(8, 2, b"\xfe\xff\x00\x80".to_vec())),
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(Value::SLong(vec![-2, -0x80000000]),
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(9, 2, b"\xff\xff\xff\xfe\x80\x00\x00\x00".to_vec()),
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(9, 2, b"\xfe\xff\xff\xff\x00\x00\x00\x80".to_vec())),
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(Value::SRational(vec![SRational { num: -1, denom: -2},
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SRational { num: -3, denom: -4}]),
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(10, 2, b"\xff\xff\xff\xff\xff\xff\xff\xfe\
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\xff\xff\xff\xfd\xff\xff\xff\xfc".to_vec()),
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(10, 2, b"\xff\xff\xff\xff\xfe\xff\xff\xff\
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\xfd\xff\xff\xff\xfc\xff\xff\xff".to_vec())),
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(Value::Float(vec![2.5, -0.5]),
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(11, 2, b"\x40\x20\x00\x00\xbf\x00\x00\x00".to_vec()),
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(11, 2, b"\x00\x00\x20\x40\x00\x00\x00\xbf".to_vec())),
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(Value::Double(vec![2.5, -0.5]),
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(12, 2, b"\x40\x04\x00\x00\x00\x00\x00\x00\
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\xbf\xe0\x00\x00\x00\x00\x00\x00".to_vec()),
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(12, 2, b"\x00\x00\x00\x00\x00\x00\x04\x40\
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\x00\x00\x00\x00\x00\x00\xe0\xbf".to_vec())),
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];
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for p in patterns.into_iter() {
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assert_eq!(compose_value::<BigEndian>(&p.0).unwrap(), p.1);
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assert_eq!(compose_value::<LittleEndian>(&p.0).unwrap(), p.2);
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}
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}
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}
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