diff --git a/Cargo.toml b/Cargo.toml
index 52cbe8f..34931cb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ mmap = ["memmap"]
 
 [dependencies]
 bytes = "1.1.0"
+eyre = "0.6.5"
 log = "0.4.14"
 lz4_flex = { version = "0.8.2", default-features = false, features = ["std", "checked-decode", "frame"] }
 memmap = { version = "0.7.0", optional = true }
@@ -21,5 +22,6 @@ smallvec = "1.6.1"
 thiserror = "1.0.28"
 
 [dev-dependencies]
+color-eyre = "0.5.11"
 env_logger = "0.9.0"
 eyre = "0.6.5"
diff --git a/examples/bag_info.rs b/examples/bag_info.rs
index 6fd1af1..323a224 100644
--- a/examples/bag_info.rs
+++ b/examples/bag_info.rs
@@ -1,29 +1,32 @@
 use std::{convert::TryFrom, env::args, fs::File, io};
 
+use eyre::Context;
 use log::{error, info, trace};
 use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
 use regex::Regex;
 use ros_message::{MessagePath, Msg};
 use rsbag::{
+    chunk::ChunkHeader,
     index::{BagIndex, ConnInfo},
     reader::{BagReader, MmapReader},
+    Result,
 };
 
-fn parse_msgdef(message_name: &str, msgdef: &str) -> rsbag::Result<Msg> {
+fn parse_msgdef(message_name: &str, msgdef: &str) -> Result<Msg> {
     trace!("message definition: {}", msgdef);
-    let path = MessagePath::try_from(message_name).map_err(rsbag::Error::other)?;
-    let msgtype = Msg::new(path, msgdef).map_err(rsbag::Error::other)?;
+    let path = MessagePath::try_from(message_name)?;
+    let msgtype = Msg::new(path, msgdef)?;
     Ok(msgtype)
 }
 
-fn parse_message_definitions(conn: &ConnInfo) -> rsbag::Result<Vec<Msg>> {
-    let msgdefs = conn.message_definition()?;
-    let boundary_re = Regex::new(r"\r?\n==+\r?\nMSG: ([^\r\n]+)\r?\n").unwrap();
-    let mut name = conn.datatype()?;
+fn parse_message_definitions(conn: &ConnInfo) -> Result<Vec<Msg>> {
+    let msgdefs = &conn.message_definition;
+    let boundary_re = Regex::new(r"\r?\n==+\r?\nMSG: ([^\r\n]+)\r?\n")?;
+    let mut name = conn.datatype.clone();
     let mut begin = 0usize;
     let mut msgs = Vec::new();
 
-    for cap in boundary_re.captures_iter(&msgdefs) {
+    for cap in boundary_re.captures_iter(msgdefs) {
         let boundary_range = cap.get(0).unwrap();
         let end = boundary_range.start();
 
@@ -43,37 +46,32 @@ fn parse_message_definitions(conn: &ConnInfo) -> rsbag::Result<Vec<Msg>> {
     Ok(msgs)
 }
 
-fn read_chunk<R: BagReader>(bag_reader: &mut R, pos: u64) -> rsbag::Result<Vec<u8>> {
-    let chunk_header = bag_reader.read_chunk_header(pos)?;
+fn read_chunk<R: BagReader>(bag_reader: &mut R, pos: u64) -> Result<Vec<u8>> {
+    let chunk_header = ChunkHeader::read(bag_reader, pos)?;
 
-    let compressed_data = bag_reader.read_data().unwrap();
+    let compressed_data = bag_reader.read_data()?;
     let mut data = Vec::with_capacity(chunk_header.uncompressed_size as usize);
     let mut decompresor = chunk_header.compression.decompress(compressed_data);
-    io::copy(&mut decompresor, &mut data).unwrap();
+    io::copy(&mut decompresor, &mut data)?;
 
     Ok(data)
 }
 
-fn main() {
+fn main() -> Result<()> {
+    color_eyre::install()?;
     env_logger::init();
 
     let args: Vec<_> = args().collect();
     if args.len() != 2 {
         eprintln!("Usage: {} <bag path>", args[0]);
-        return;
+        return Ok(());
     }
 
     let bag_path = &args[1];
     let bag_file = File::open(bag_path).expect("Could not open bag file");
-    let mut bag_reader = MmapReader::new(bag_file).unwrap();
+    let mut bag_reader = MmapReader::new(bag_file)?;
 
-    let index = match BagIndex::read_all(&mut bag_reader) {
-        Ok(index) => index,
-        Err(err) => {
-            error!("bag parse error: {}", err);
-            return;
-        }
-    };
+    let index = BagIndex::read_all(&mut bag_reader).wrap_err("bag parse error")?;
 
     for conn in &index.connections {
         match parse_message_definitions(conn) {
@@ -93,42 +91,45 @@ fn main() {
         }
     }
 
-    // let mut total_size = 0;
-
-    // let total_size = index
-    //     .chunks
-    //     .par_iter()
-    //     .try_fold(
-    //         || 0u64,
-    //         |total_size, chunk| -> rsbag::Result<_> {
-    //             let chunk_header = bag_reader.clone().read_chunk_header(chunk.pos)?;
-
-    //             // let data = read_chunk(&mut bag_reader.clone(), chunk.pos)?;
-    //             // chunks.push(data);
-    //             Ok(total_size + chunk_header.uncompressed_size as u64)
-    //         },
-    //     )
-    //     .reduce(
-    //         // || Ok(Vec::new()),
-    //         || Ok(0),
-    //         |a, b| a.and_then(|a| b.map(|b| a + b)),
-    //     ).unwrap();
-
     let total_size = index
         .chunks
         .par_iter()
         .try_fold(
             || 0u64,
             |total_size, chunk| -> rsbag::Result<_> {
-                let data = read_chunk(&mut bag_reader.clone(), chunk.pos)?;
-                Ok(total_size + data.len() as u64)
+                let mut reader = bag_reader.clone();
+                let chunk_header = ChunkHeader::read(&mut reader, chunk.pos)?;
+                reader.skip_data()?;
+
+                // let data = read_chunk(&mut bag_reader.clone(), chunk.pos)?;
+                // chunks.push(data);
+                Ok(total_size + chunk_header.uncompressed_size as u64)
             },
         )
         .reduce(
             // || Ok(Vec::new()),
             || Ok(0),
             |a, b| a.and_then(|a| b.map(|b| a + b)),
-        ).unwrap();
+        )
+        .unwrap();
+
+    // let total_size = index
+    //     .chunks
+    //     .par_iter()
+    //     .try_fold(
+    //         || 0u64,
+    //         |total_size, chunk| -> Result<_> {
+    //             let data = read_chunk(&mut bag_reader.clone(), chunk.pos)?;
+    //             Ok(total_size + data.len() as u64)
+    //         },
+    //     )
+    //     .reduce(
+    //         // || Ok(Vec::new()),
+    //         || Ok(0),
+    //         |a, b| a.and_then(|a| b.map(|b| a + b)),
+    //     )?;
 
     info!("total uncompressed size: {}", total_size);
+
+    Ok(())
 }
diff --git a/src/chunk.rs b/src/chunk.rs
index 7891614..1230ee9 100644
--- a/src/chunk.rs
+++ b/src/chunk.rs
@@ -1,6 +1,16 @@
-use std::{io, str::FromStr};
+use std::{
+    io::{self, SeekFrom},
+    str::FromStr,
+};
 
-use crate::{parse::Header, Error, Result};
+use eyre::bail;
+
+use crate::{
+    error,
+    parse::{Header, Op},
+    reader::BagReader,
+    Error, Result,
+};
 
 #[derive(Clone, Copy, Debug)]
 pub enum Compression {
@@ -17,7 +27,7 @@ impl FromStr for Compression {
             "none" => Compression::None,
             "bz2" => Compression::Bz2,
             "lz4" => Compression::Lz4,
-            _ => return Err(Error::UnsupportedCompression(s.to_string())),
+            _ => bail!(error::UnsupportedCompression(s.to_string())),
         })
     }
 }
@@ -39,8 +49,14 @@ pub struct ChunkHeader {
 }
 
 impl ChunkHeader {
+    pub fn read<R: BagReader>(reader: &mut R, pos: u64) -> Result<ChunkHeader> {
+        reader.seek(SeekFrom::Start(pos))?;
+        let header = reader.read_header_op(Op::Chunk)?;
+        ChunkHeader::from_header(header)
+    }
+
     pub fn from_header(header: Header) -> Result<Self> {
-        Ok(Self {
+        Ok(ChunkHeader {
             compression: header.read_string(b"compression")?.parse()?,
             uncompressed_size: header.read_u32(b"size")?,
         })
diff --git a/src/error.rs b/src/error.rs
index 8fbb6b0..17352fc 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,51 +1,21 @@
-use num_enum::TryFromPrimitiveError;
 use thiserror::Error;
 
-use crate::parse::{self, Op};
+use crate::parse::{self};
 
 #[derive(Debug, Error)]
-pub enum Error {
-    #[error("i/o error: {0}")]
-    Io(#[from] std::io::Error),
-    #[error("{0}")]
-    Parse(parse::Error<parse::InputOwned>),
-    #[error("unsupported version: {0}")]
-    UnsupportedVersion(parse::Version),
-    #[error("unsupported encryptor: {0}")]
-    UnsupportedEncryptor(String),
-    #[error("unsupported compression: {0}")]
-    UnsupportedCompression(String),
-    #[error("unexpected EOF")]
-    Eof,
-    #[error("invalid header op: {0}")]
-    InvalidOp(#[from] TryFromPrimitiveError<Op>),
-    #[error("missing field: {0:?}")]
-    MissingField(String),
-    #[error("bag is unindexed")]
-	Unindexed,
-    #[error("{0}")]
-    Other(String),
-}
+#[error("bag is unindexed")]
+pub struct Unindexed;
 
-impl<'a> From<parse::Error<parse::Input<'a>>> for Error {
-    fn from(err: parse::Error<parse::Input>) -> Self {
-        Error::Parse(err.into_owned())
-    }
-}
+#[derive(Debug, Error)]
+#[error("unsupported encryptor: {0}")]
+pub struct UnsupportedEncryptor(pub String);
 
-impl<'a> From<nom::Err<parse::Error<parse::Input<'a>>>> for Error {
-    fn from(err: nom::Err<parse::Error<parse::Input<'a>>>) -> Self {
-        match err {
-            nom::Err::Error(e) | nom::Err::Failure(e) => e.into(),
-            nom::Err::Incomplete(_) => panic!("incomplete error"),
-        }
-    }
-}
+#[derive(Debug, Error)]
+#[error("unsupported bag version: {0}")]
+pub struct UnsupportedVersion(pub parse::Version);
 
-impl Error {
-    pub fn other<S: ToString>(message: S) -> Self {
-        Error::Other(message.to_string())
-    }
-}
+#[derive(Debug, Error)]
+#[error("unsupported compression: {0}")]
+pub struct UnsupportedCompression(pub String);
 
-pub type Result<T, E = Error> = core::result::Result<T, E>;
+pub use eyre::{Report as Error, Result};
diff --git a/src/index.rs b/src/index.rs
index eb29c3f..66a0789 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -1,40 +1,41 @@
 use std::io::SeekFrom;
 
+use eyre::bail;
 use log::trace;
+use nom::{number::streaming::le_u32, sequence::tuple, Parser};
 
 use crate::{
-    parse::{Header, Op},
+    error,
+    parse::{self, Header, Op},
     reader::BagReader,
-    Error, Result,
+    Result,
 };
 
 #[derive(Debug)]
 pub struct ConnInfo {
     pub id: u32,
     pub topic: String,
-    pub conn_header: Header,
+    pub message_definition: String,
+    pub datatype: String,
+    pub md5sum: String,
 }
 
 impl ConnInfo {
+    pub fn read<R: BagReader>(reader: &mut R) -> Result<Self> {
+        let record_header = reader.read_header_op(Op::Connection)?;
+        let conn_header = reader.read_header()?;
+        Self::from_headers(record_header, conn_header)
+    }
+
     pub fn from_headers(record_header: Header, conn_header: Header) -> Result<Self> {
         Ok(ConnInfo {
             id: record_header.read_u32(b"conn")?,
             topic: record_header.read_string(b"topic")?,
-            conn_header,
+            message_definition: conn_header.read_string(b"message_definition")?,
+            datatype: conn_header.read_string(b"type")?,
+            md5sum: conn_header.read_string(b"md5sum")?,
         })
     }
-
-    pub fn message_definition(&self) -> Result<String> {
-        self.conn_header.read_string(b"message_definition")
-    }
-
-    pub fn datatype(&self) -> Result<String> {
-        self.conn_header.read_string(b"type")
-    }
-
-    pub fn md5sum(&self) -> Result<String> {
-        self.conn_header.read_string(b"md5sum")
-    }
 }
 
 #[derive(Debug)]
@@ -42,23 +43,51 @@ pub struct ChunkInfo {
     pub pos: u64,
     pub start_time: u64, // TODO: unpack time
     pub end_time: u64,
-    pub conn_count: u32,
+    pub connections: Vec<ChunkConnection>,
 }
 
 impl ChunkInfo {
-    pub fn from_header(header: Header) -> Result<Self> {
+    pub fn read<R: BagReader>(reader: &mut R) -> Result<Self> {
+        let header = reader.read_header_op(Op::ChunkInfo)?;
         if header.read_u32(b"ver")? != 1 {
-            return Err(Error::other("unsupported ChunkInfo version"));
+            bail!("unsupported ChunkInfo version");
+        }
+
+        reader.read_data_length()?; // Data length not needed
+
+        let conn_count = header.read_u32(b"count")?;
+        let mut connections = Vec::with_capacity(conn_count as usize);
+        for _ in 0..conn_count {
+            let conn = ChunkConnection::read(reader)?;
+            connections.push(conn);
         }
         Ok(ChunkInfo {
             pos: header.read_u64(b"chunk_pos")?,
             start_time: header.read_u64(b"start_time")?,
             end_time: header.read_u64(b"end_time")?,
-            conn_count: header.read_u32(b"count")?,
+            connections,
         })
     }
 }
 
+#[derive(Debug)]
+pub struct ChunkConnection {
+    pub conn_id: u32,
+    pub count: u32,
+}
+
+impl ChunkConnection {
+    pub fn parse(input: parse::Input) -> parse::IResult<Self> {
+        tuple((le_u32, le_u32))
+            .map(|(conn_id, count)| ChunkConnection { conn_id, count })
+            .parse(input)
+    }
+
+    pub fn read<R: BagReader>(reader: &mut R) -> Result<Self> {
+        reader.read_parser(Self::parse)
+    }
+}
+
 #[derive(Debug)]
 pub struct BagIndex {
     pub connections: Vec<ConnInfo>,
@@ -76,11 +105,11 @@ impl BagIndex {
         trace!("index pos: {}", index_pos);
 
         if index_pos == 0 {
-            return Err(Error::Unindexed);
+            bail!(error::Unindexed);
         }
 
         if let Ok(encryptor) = file_header.read_string(b"encryptor") {
-            return Err(Error::UnsupportedEncryptor(encryptor));
+            bail!(error::UnsupportedEncryptor(encryptor));
         }
 
         reader.seek(SeekFrom::Start(index_pos))?;
@@ -91,7 +120,7 @@ impl BagIndex {
         let mut connections = Vec::with_capacity(conn_count as usize);
 
         for _ in 0..conn_count {
-            let conn = reader.read_conn_info()?;
+            let conn = ConnInfo::read(reader)?;
             trace!("connection: id={}, topic={}", conn.id, conn.topic);
             connections.push(conn);
         }
@@ -102,7 +131,7 @@ impl BagIndex {
         let mut chunks = Vec::with_capacity(chunk_count as usize);
 
         for _ in 0..chunk_count {
-            let chunk = reader.read_chunk_info()?;
+            let chunk = ChunkInfo::read(reader)?;
             chunks.push(chunk);
         }
 
@@ -118,7 +147,7 @@ impl BagIndex {
         if (version.major, version.minor) == (2, 0) {
             Self::read_v2(reader)
         } else {
-            Err(Error::UnsupportedVersion(version))
+            bail!(error::UnsupportedVersion(version));
         }
     }
 }
diff --git a/src/parse.rs b/src/parse.rs
index b458a04..e935464 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -1,11 +1,9 @@
 mod error;
-mod fields;
-mod header;
+pub mod header;
 mod version;
 
 pub use error::{Error, ErrorKind};
-pub use fields::Op;
-pub use header::Header;
+pub use header::{Header, Op};
 pub use version::Version;
 
 pub type Input<'a> = &'a [u8];
diff --git a/src/parse/error.rs b/src/parse/error.rs
index 38b1609..b5ac198 100644
--- a/src/parse/error.rs
+++ b/src/parse/error.rs
@@ -149,6 +149,12 @@ impl<I: ToOwned + ?Sized> Error<&I> {
     }
 }
 
+impl<'a> From<Error<&'a [u8]>> for Error<Vec<u8>> {
+    fn from(e: Error<&'a [u8]>) -> Self {
+        e.into_owned()
+    }
+}
+
 // adapted from https://fasterthanli.me/series/making-our-own-ping/part-9
 impl<I: ErrorInputDisplay> fmt::Display for Error<I> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
diff --git a/src/parse/header.rs b/src/parse/header.rs
index f963d91..a9005b6 100644
--- a/src/parse/header.rs
+++ b/src/parse/header.rs
@@ -11,8 +11,16 @@ use nom::{
 };
 use smallvec::SmallVec;
 
-use super::{fields, IResult, Input, Op};
-use crate::{Error, Result};
+use super::{IResult, Input};
+use crate::Result;
+
+mod error;
+mod fields;
+
+pub use self::{
+    error::{FieldDataError, MissingFieldError},
+    fields::Op,
+};
 
 #[derive(Clone, Debug)]
 pub struct HeaderField {
@@ -70,15 +78,15 @@ impl Header {
         .parse(input)
     }
 
-    pub fn find_field(&self, name: &[u8]) -> Result<&[u8]> {
+    fn find_field(&self, name: &[u8]) -> Result<&[u8]> {
         self.0
             .iter()
             .find(|field| field.name() == name)
             .map(|field| field.value())
-            .ok_or_else(|| Error::MissingField(String::from_utf8_lossy(name).into_owned()))
+            .ok_or_else(|| MissingFieldError(String::from_utf8_lossy(name).into_owned()).into())
     }
 
-    pub fn read_op(&self) -> Result<Op> {
+    pub fn read_op(&self) -> Result<fields::Op> {
         self.find_field(b"op").and_then(fields::Op::parse)
     }
 
diff --git a/src/parse/header/error.rs b/src/parse/header/error.rs
new file mode 100644
index 0000000..42e61e6
--- /dev/null
+++ b/src/parse/header/error.rs
@@ -0,0 +1,26 @@
+use thiserror::Error;
+
+use crate::parse;
+
+#[derive(Debug, Error)]
+#[error("missing field {0:?}")]
+pub struct MissingFieldError(pub String);
+
+#[derive(Debug, Error)]
+#[error("bad field data: {0}")]
+pub struct FieldDataError(#[source] pub parse::Error<parse::InputOwned>);
+
+impl<'a> From<parse::Error<parse::Input<'a>>> for FieldDataError {
+    fn from(err: parse::Error<parse::Input<'a>>) -> Self {
+        FieldDataError(err.into_owned())
+    }
+}
+
+impl<'a> From<nom::Err<parse::Error<parse::Input<'a>>>> for FieldDataError {
+    fn from(err: nom::Err<parse::Error<parse::Input<'a>>>) -> Self {
+        match err {
+            nom::Err::Error(e) | nom::Err::Failure(e) => e.into(),
+            nom::Err::Incomplete(_) => unreachable!("incomplete error"),
+        }
+    }
+}
diff --git a/src/parse/fields.rs b/src/parse/header/fields.rs
similarity index 61%
rename from src/parse/fields.rs
rename to src/parse/header/fields.rs
index 47efada..44433cf 100644
--- a/src/parse/fields.rs
+++ b/src/parse/header/fields.rs
@@ -5,8 +5,7 @@ use nom::{
 };
 use num_enum::TryFromPrimitive;
 
-use super::Input;
-use crate::{Error, Result};
+use super::{FieldDataError, Input, Result};
 
 #[derive(Clone, Copy, Debug, TryFromPrimitive, PartialEq)]
 #[repr(u8)]
@@ -21,21 +20,27 @@ pub enum Op {
 
 impl Op {
     pub fn parse(input: Input) -> Result<Self> {
-        let (_, op) = all_consuming(le_u8).parse(input)?;
+        let (_, op) = all_consuming(le_u8)
+            .parse(input)
+            .map_err(FieldDataError::from)?;
         Op::try_from_primitive(op).map_err(Into::into)
     }
 }
 
 pub fn parse_u32(input: Input) -> Result<u32> {
-    let (_, x) = all_consuming(le_u32).parse(input)?;
+    let (_, x) = all_consuming(le_u32)
+        .parse(input)
+        .map_err(FieldDataError::from)?;
     Ok(x)
 }
 
 pub fn parse_u64(input: Input) -> Result<u64> {
-    let (_, x) = all_consuming(le_u64).parse(input)?;
+    let (_, x) = all_consuming(le_u64)
+        .parse(input)
+        .map_err(FieldDataError::from)?;
     Ok(x)
 }
 
 pub fn parse_string(input: Input) -> Result<String> {
-    String::from_utf8(input.to_owned()).map_err(|_| Error::other("invalid utf8"))
+    Ok(String::from_utf8(input.to_owned())?)
 }
diff --git a/src/reader.rs b/src/reader.rs
index cc3faf8..ed016fe 100644
--- a/src/reader.rs
+++ b/src/reader.rs
@@ -3,18 +3,17 @@ use std::io::SeekFrom;
 use nom::multi::length_data;
 use nom::number::streaming::le_u32;
 
-use crate::chunk::ChunkHeader;
-use crate::error::{Error, Result};
-use crate::index::{ChunkInfo, ConnInfo};
+use crate::error::Result;
 use crate::parse::{self, Header, Op, Version};
 
+pub mod error;
 mod io;
 #[cfg(feature = "mmap")]
 mod mmap;
 
-pub use io::IoReader;
+pub use self::io::IoReader;
 #[cfg(feature = "mmap")]
-pub use mmap::MmapReader;
+pub use self::mmap::MmapReader;
 
 pub trait BagReader {
     type Read: std::io::Read;
@@ -37,8 +36,9 @@ pub trait BagReader {
 
     fn read_header_op(&mut self, op: Op) -> Result<Header> {
         let header = self.read_header()?;
-        if header.read_op()? != op {
-            return Err(Error::other(format!("Expected {:?} op", op)));
+        let actual_op = header.read_op()?;
+        if actual_op != op {
+            return Err(error::UnexpectedOp(op, actual_op).into());
         }
         Ok(header)
     }
@@ -56,23 +56,4 @@ pub trait BagReader {
     fn read_data(&mut self) -> Result<&[u8]> {
         self.read_parser(length_data(le_u32))
     }
-
-    fn read_conn_info(&mut self) -> Result<ConnInfo> {
-        let record_header = self.read_header_op(Op::Connection)?;
-        let conn_header = self.read_header()?;
-        ConnInfo::from_headers(record_header, conn_header)
-    }
-
-    fn read_chunk_info(&mut self) -> Result<ChunkInfo> {
-        let header = self.read_header_op(Op::ChunkInfo)?;
-        // TODO: read connection message counts
-        self.skip_data()?;
-        ChunkInfo::from_header(header)
-    }
-
-    fn read_chunk_header(&mut self, pos: u64) -> Result<ChunkHeader> {
-        self.seek(SeekFrom::Start(pos))?;
-        let header = self.read_header_op(Op::Chunk)?;
-        ChunkHeader::from_header(header)
-    }
 }
diff --git a/src/reader/error.rs b/src/reader/error.rs
new file mode 100644
index 0000000..46e6e2f
--- /dev/null
+++ b/src/reader/error.rs
@@ -0,0 +1,11 @@
+use thiserror::Error;
+
+use crate::parse::Op;
+
+#[derive(Debug, Error)]
+#[error("unexpected EOF")]
+pub struct UnexpectedEof;
+
+#[derive(Debug, Error)]
+#[error("expected op {0:?}, got {1:?}")]
+pub struct UnexpectedOp(pub Op, pub Op);
diff --git a/src/reader/io.rs b/src/reader/io.rs
index 5095aec..0b7900c 100644
--- a/src/reader/io.rs
+++ b/src/reader/io.rs
@@ -2,8 +2,8 @@ use std::io;
 
 use bytes::{Buf, BytesMut};
 
-use super::BagReader;
-use crate::{parse, Error, Result};
+use super::{error::UnexpectedEof, BagReader};
+use crate::{parse, Result};
 
 const READ_SIZE: usize = 4096;
 
@@ -31,7 +31,7 @@ impl<R: io::Read + io::Seek> IoReader<R> {
         let read = self.read.read(&mut self.buffer[old_size..])?;
         self.buffer.truncate(old_size + read);
         if read == 0 {
-            return Err(Error::Eof);
+            return Err(UnexpectedEof.into());
         }
         Ok(())
     }
@@ -69,7 +69,7 @@ impl<R: io::Read + io::Seek> BagReader for IoReader<R> {
                     unsafe { &mut *this }.read_more(needed.max(READ_SIZE))?;
                 }
                 Err(nom::Err::Error(e) | nom::Err::Failure(e)) => {
-                    return Err(e.into());
+                    return Err(e.into_owned().into());
                 }
             }
         }
diff --git a/src/reader/mmap.rs b/src/reader/mmap.rs
index 49f0c50..b7aea93 100644
--- a/src/reader/mmap.rs
+++ b/src/reader/mmap.rs
@@ -1,9 +1,10 @@
 use std::{fs::File, io, sync::Arc};
 
+use eyre::bail;
 use memmap::Mmap;
 
-use super::BagReader;
-use crate::{parse, Error, Result};
+use super::{error::UnexpectedEof, BagReader};
+use crate::{parse, Result};
 
 #[derive(Clone)]
 pub struct MmapReader {
@@ -46,14 +47,14 @@ impl BagReader for MmapReader {
     where
         P: nom::Parser<&'a [u8], O, parse::Error<&'a [u8]>>,
     {
-        let input = self.mmap.get(self.pos..).ok_or(Error::Eof)?;
+        let input = self.mmap.get(self.pos..).ok_or(UnexpectedEof)?;
         match parser.parse(input) {
             Ok((rest, output)) => {
                 self.pos += input.len() - rest.len();
                 Ok(output)
             }
-            Err(nom::Err::Incomplete(_)) => Err(Error::Eof),
-            Err(nom::Err::Error(e) | nom::Err::Failure(e)) => Err(e.into()),
+            Err(nom::Err::Incomplete(_)) => bail!(UnexpectedEof),
+            Err(nom::Err::Error(e) | nom::Err::Failure(e)) => Err(e.into_owned().into()),
         }
     }