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@ -1,14 +1,13 @@
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use super::chunks::*;
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use std::io::{Write, BufWriter, ErrorKind, BufReader, Read};
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use std::fs::File;
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use std::collections::HashMap;
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use std::io::Error;
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use byteorder::{BigEndian, ByteOrder};
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use std::collections::HashMap;
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use std::convert::TryInto;
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use std::fs::File;
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use std::io::Error;
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use std::io::{BufReader, BufWriter, ErrorKind, Read, Write};
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const ENTRIES_PER_CHUNK: u32 = 100_000;
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pub struct BDFReader {
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reader: BufReader<File>,
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pub metadata: Option<MetaChunk>,
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@ -16,7 +15,6 @@ pub struct BDFReader {
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compressed: bool,
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}
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pub struct BDFWriter {
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writer: BufWriter<File>,
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metadata: MetaChunk,
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@ -28,7 +26,14 @@ pub struct BDFWriter {
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}
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impl BDFWriter {
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/// Creates a new BDFWriter.
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/// The number for `entry_count` should be the total number of entries
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/// This is required since the META chunk containing the information is the
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/// first chunk to be written.
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/// The number of entries can be used in tools that provide a progress
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/// bar for how many entries were read.
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/// If the `compress` parameter is true, each data chunk will be compressed
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/// using lzma with a default level of 1.
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pub fn new(writer: BufWriter<File>, entry_count: u64, compress: bool) -> Self {
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Self {
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metadata: MetaChunk::new(entry_count, ENTRIES_PER_CHUNK, compress),
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@ -70,7 +75,6 @@ impl BDFWriter {
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}
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/// Writes the data to the file
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pub fn flush(&mut self) -> Result<(), Error> {
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if !self.head_written {
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self.writer.write(BDF_HDR)?;
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@ -98,6 +102,15 @@ impl BDFWriter {
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self.writer.flush()
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}
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/// Flushes the buffered chunk data and the writer
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/// to finish the file.
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pub fn finish(&mut self) -> Result<(), Error> {
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self.flush()?;
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self.flush_writer()?;
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Ok(())
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}
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/// Sets the compression level for lzma compression
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pub fn set_compression_level(&mut self, level: u32) {
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self.compression_level = level;
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@ -105,18 +118,21 @@ impl BDFWriter {
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/// Changes the entries per chunk value.
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/// Returns an error if the metadata has already been written.
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pub fn set_entries_per_chunk(&mut self, number: u32) -> Result<(), Error>{
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pub fn set_entries_per_chunk(&mut self, number: u32) -> Result<(), Error> {
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if self.head_written {
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return Err(Error::new(ErrorKind::Other, "the head has already been written"))
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return Err(Error::new(
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ErrorKind::Other,
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"the head has already been written",
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));
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}
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self.metadata.entries_per_chunk = number;
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self.metadata.chunk_count = (self.metadata.entry_count as f64 / number as f64).ceil() as u32;
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self.metadata.chunk_count =
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(self.metadata.entry_count as f64 / number as f64).ceil() as u32;
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Ok(())
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}
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}
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impl BDFReader {
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/// Creates a new BDFReader
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pub fn new(reader: BufReader<File>) -> Self {
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Self {
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@ -127,6 +143,14 @@ impl BDFReader {
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}
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}
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/// Reads the metadata and lookup table
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pub fn read_start(&mut self) -> Result<(), Error> {
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self.read_metadata()?;
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self.read_lookup_table()?;
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Ok(())
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}
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/// Verifies the header of the file and reads and stores the metadata
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pub fn read_metadata(&mut self) -> Result<&MetaChunk, Error> {
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if !self.validate_header() {
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@ -208,4 +232,4 @@ impl BDFReader {
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Ok(gen_chunk)
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}
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}
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}
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