Mercurial > touhou

annotate src/th06/pbg3.rs @ 669:1bb8b34dbd32

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Don’t allocate a Vec while reading a String in ECL.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Mon, 12 Aug 2019 15:10:19 +0200
parents 7bde50132735
children 0ebf6467e4ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
637
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1 //! PBG3 archive files handling.
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2 //!
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3 //! This module provides classes for handling the PBG3 file format.
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4 //! The PBG3 format is the archive format used by Touhou 6: EoSD.
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5 //!
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6 //! PBG3 files are merely a bitstream composed of a header, a file
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7 //! table, and LZSS-compressed files.
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8
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9 use crate::util::bitstream::BitStream;
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10 use crate::util::lzss;
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11 use std::io;
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12 use std::collections::hash_map::{self, HashMap};
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13
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14 /// Helper struct to handle strings and integers in PBG3 bitstreams.
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15 pub struct PBG3BitStream<R: io::Read + io::Seek> {
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16 bitstream: BitStream<R>,
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17 }
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18
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19 impl<R: io::Read + io::Seek> PBG3BitStream<R> {
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20 /// Create a bitstream capable of reading u32 and strings.
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21 pub fn new(bitstream: BitStream<R>) -> PBG3BitStream<R> {
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22 PBG3BitStream {
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23 bitstream,
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24 }
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25 }
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26
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27 /// Seek inside the bitstream, ditching any unused data read.
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28 pub fn seek(&mut self, seek_from: io::SeekFrom) -> io::Result<u64> {
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29 self.bitstream.seek(seek_from)
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30 }
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31
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32 /// Return the current position in the stream.
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33 pub fn tell(&mut self) -> io::Result<u64> {
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34 self.bitstream.seek(io::SeekFrom::Current(0))
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35 }
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36
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37 /// Read a given amount of bits.
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38 pub fn read(&mut self, nb_bits: usize) -> io::Result<usize> {
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39 self.bitstream.read(nb_bits)
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40 }
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41
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42 /// Read a given amount of bytes.
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43 pub fn read_bytes(&mut self, nb_bytes: usize) -> io::Result<Vec<u8>> {
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44 self.bitstream.read_bytes(nb_bytes)
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45 }
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46
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47 /// Read an integer from the bitstream.
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48 ///
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49 /// Integers have variable sizes. They begin with a two-bit value indicating
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50 /// the number of (non-aligned) bytes to read.
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51 pub fn read_u32(&mut self) -> io::Result<u32> {
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52 let size = self.read(2)?;
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53 Ok(self.read((size + 1) * 8)? as u32)
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54 }
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55
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56 /// Read a string from the bitstream.
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57 ///
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58 /// Strings are stored as NULL-terminated sequences of bytes.
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59 /// The only catch is that they are not byte-aligned.
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60 pub fn read_string(&mut self, mut max_size: usize) -> io::Result<Vec<u8>> {
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61 let mut buf = Vec::new();
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62 while max_size > 0 {
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63 let byte = self.read(8)? as u8;
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64 if byte == 0 {
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65 break;
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66 }
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67 buf.push(byte);
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68 max_size -= 1;
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69 }
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70 Ok(buf)
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71 }
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72 }
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73
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74 type Entry = (u32, u32, u32, u32, u32);
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75
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76 /// Handle PBG3 archive files.
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77 ///
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78 /// PBG3 is a file archive format used in Touhou 6: EoSD.
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79 /// This class provides a representation of such files, as well as functions to
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80 /// read and extract files from a PBG3 archive.
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81 pub struct PBG3<R: io::Read + io::Seek> {
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82 /// List of PBG3Entry objects describing files present in the archive.
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83 entries: HashMap<String, Entry>,
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84
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85 /// PBG3BitStream struct.
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86 bitstream: PBG3BitStream<R>,
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87 }
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88
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89 impl<R: io::Read + io::Seek> PBG3<R> {
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90 /// Create a PBG3 archive.
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91 fn new(entries: HashMap<String, Entry>, bitstream: PBG3BitStream<R>) -> PBG3<R> {
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92 PBG3 {
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93 entries,
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94 bitstream,
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95 }
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96 }
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97
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98 /// Open a PBG3 archive.
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99 pub fn from_file(mut file: R) -> io::Result<PBG3<R>> {
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100 let mut magic = [0; 4];
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101 file.read(&mut magic)?;
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102 if &magic != b"PBG3" {
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103 return Err(io::Error::new(io::ErrorKind::Other, "Wrong magic!"));
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104 }
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105
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106 let bitstream = BitStream::new(file);
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107 let mut bitstream = PBG3BitStream::new(bitstream);
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108 let mut entries = HashMap::new();
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109
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110 let nb_entries = bitstream.read_u32()?;
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111 let offset = bitstream.read_u32()?;
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112 bitstream.seek(io::SeekFrom::Start(offset as u64))?;
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113
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114 for _ in 0..nb_entries {
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115 let unknown_1 = bitstream.read_u32()?;
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116 let unknown_2 = bitstream.read_u32()?;
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117 let checksum = bitstream.read_u32()?; // Checksum of *compressed data*
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118 let offset = bitstream.read_u32()?;
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119 let size = bitstream.read_u32()?;
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120 let name = bitstream.read_string(255)?;
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121 // XXX: no unwrap!
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122 let name = String::from_utf8(name).unwrap();
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123 entries.insert(name, (unknown_1, unknown_2, checksum, offset, size));
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124 }
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125
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126 Ok(PBG3::new(entries, bitstream))
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127 }
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128
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129 /// List all file entries in this PBG3 archive.
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130 pub fn list_files(&self) -> hash_map::Keys<String, Entry> {
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131 self.entries.keys()
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132 }
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133
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134 /// Read a single file from this PBG3 archive.
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135 pub fn get_file(&mut self, filename: String, check: bool) -> io::Result<Vec<u8>> {
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136 // XXX: no unwrap!
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137 let (_unknown_1, _unknown_2, checksum, offset, size) = self.entries.get(&filename).unwrap();
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138 self.bitstream.seek(io::SeekFrom::Start(*offset as u64))?;
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139 let data = lzss::decompress(&mut self.bitstream.bitstream, *size as usize, 0x2000, 13, 4, 3)?;
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140 if check {
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141 // Verify the checksum.
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142 let compressed_size = self.bitstream.tell()? as u32 - *offset;
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143 self.bitstream.seek(io::SeekFrom::Start(*offset as u64))?;
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144 let mut value: u32 = 0;
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145 for c in self.bitstream.read_bytes(compressed_size as usize)? {
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146 value += c as u32;
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147 value &= 0xffffffff;
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148 }
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149 if value != *checksum {
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150 return Err(io::Error::new(io::ErrorKind::Other, "Corrupted data!"));
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151 }
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152 }
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153 Ok(data)
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154 }
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155 }
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156
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157 #[cfg(test)]
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158 mod tests {
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159 use super::*;
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160 use crate::util::SeekableSlice;
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161 use std::fs::File;
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162
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163 #[test]
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164 fn bitstream() {
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165 let data = SeekableSlice::new(b"Hello world!\0");
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166 let bitstream = BitStream::new(data);
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167 let mut pbg3 = PBG3BitStream::new(bitstream);
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168 assert_eq!(pbg3.read_string(42).unwrap(), b"Hello world!");
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169 }
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170
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171 #[test]
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172 fn file_present() {
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173 let file = File::open("EoSD/MD.DAT").unwrap();
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174 let file = io::BufReader::new(file);
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175 let pbg3 = PBG3::from_file(file).unwrap();
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176 let files = pbg3.list_files().cloned().collect::<Vec<String>>();
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177 assert!(files.contains(&String::from("th06_01.pos")));
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178 }
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179
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180 #[test]
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181 fn check_all_files() {
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182 let file = File::open("EoSD/MD.DAT").unwrap();
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183 let file = io::BufReader::new(file);
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184 let mut pbg3 = PBG3::from_file(file).unwrap();
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185 let files = pbg3.list_files().cloned().collect::<Vec<String>>();
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186 for filename in files {
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187 pbg3.get_file(filename, true).unwrap();
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188 }
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189 }
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190 }