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@ -1,4 +1,5 @@
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use byteorder::{BigEndian, ByteOrder};
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use crc::crc32;
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use std::collections::HashMap;
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use std::convert::{TryFrom, TryInto};
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use std::fs::File;
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@ -168,28 +169,50 @@ impl GenericChunk {
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impl From<MetaChunk> for GenericChunk {
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fn from(chunk: MetaChunk) -> GenericChunk {
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let serialized_data = chunk.serialize();
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let crc_sum = crc32::checksum_ieee(serialized_data.as_slice());
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GenericChunk {
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length: serialized_data.len() as u32,
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name: META_CHUNK_NAME.to_string(),
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data: serialized_data,
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crc: crc_sum,
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}
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}
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}
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impl From<HashLookupTable> for GenericChunk {
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fn from(chunk: HashLookupTable) -> GenericChunk {
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let serialized_data = chunk.serialize();
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let crc_sum = crc32::checksum_ieee(serialized_data.as_slice());
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GenericChunk {
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length: serialized_data.len() as u32,
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name: HTBL_CHUNK_NAME.to_string(),
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data: serialized_data,
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crc: crc_sum,
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}
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}
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}
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impl MetaChunk {
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pub fn serialize(&self) -> Vec<u8> {
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let mut serialized_data: Vec<u8> = Vec::new();
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let mut chunk_count_raw = [0u8; 4];
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BigEndian::write_u32(&mut chunk_count_raw, chunk.chunk_count);
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BigEndian::write_u32(&mut chunk_count_raw, self.chunk_count);
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serialized_data.append(&mut chunk_count_raw.to_vec());
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let mut entries_pc_raw = [0u8; 4];
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BigEndian::write_u32(&mut entries_pc_raw, chunk.entries_per_chunk);
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BigEndian::write_u32(&mut entries_pc_raw, self.entries_per_chunk);
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serialized_data.append(&mut entries_pc_raw.to_vec());
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let mut total_entries_raw = [0u8; 4];
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BigEndian::write_u32(&mut total_entries_raw, chunk.entry_count);
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BigEndian::write_u32(&mut total_entries_raw, self.entry_count);
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serialized_data.append(&mut total_entries_raw.to_vec());
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if let Some(method) = chunk.compression_method {
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serialized_data.append(&mut method.into_bytes());
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let mut compression_method = self.compression_method.clone();
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if let Some(method) = &mut compression_method {
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serialized_data.append(&mut method.clone().into_bytes());
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} else {
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serialized_data.append(&mut vec![0, 0, 0, 0]);
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}
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GenericChunk {
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length: serialized_data.len() as u32,
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name: META_CHUNK_NAME.to_string(),
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data: serialized_data,
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crc: 0,
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}
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serialized_data
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}
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}
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@ -235,6 +258,16 @@ impl HashLookupTable {
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pub fn get_entry(&self, id: u32) -> Option<&HashEntry> {
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self.entries.get(&id)
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}
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/// Serializes the lookup table into a vector of bytes
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pub fn serialize(&self) -> Vec<u8> {
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let mut serialized_full: Vec<u8> = Vec::new();
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for (_, entry) in &self.entries {
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serialized_full.append(entry.serialize().as_mut())
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}
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serialized_full
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}
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}
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impl TryFrom<GenericChunk> for HashLookupTable {
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@ -278,7 +311,7 @@ impl TryFrom<GenericChunk> for HashLookupTable {
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}
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impl HashEntry {
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pub fn serialize(&mut self) -> Vec<u8> {
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pub fn serialize(&self) -> Vec<u8> {
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let mut serialized: Vec<u8> = Vec::new();
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let mut id_raw = [0u8; 4];
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BigEndian::write_u32(&mut id_raw, self.id);
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trivernis
5 years ago