Do not raise error if code equals range in get_bit

src/decode/rangecoder.rs

@@ -56,13 +56,7 @@ where
     fn get_bit(&mut self) -> error::Result<bool> {
         self.range >>= 1;
 
-        if self.code == self.range {
-            return Err(error::Error::LZMAError(String::from(
-                "Corrupted range coding",
-            )));
-        }
-
-        let bit = self.code > self.range;
+        let bit = self.code >= self.range;
         if bit {
             self.code -= self.range
         }

tests/files/README.md

@@ -0,0 +1,10 @@
+# Test files #
+
+This folder contains a collection of test files to cover different use cases of the lzma-rs library.
+
+This README describes files that are not self-explanatory in this folder.
+
+## bad-random-data
+
+This is a file that causes the code and range to be equal at some point during decoding LZMA data.
+Previously, this file would raise an `LZMAError("Corrupted range coding")`, although the file is a valid LZMA file.

tests/lzma.rs

@@ -72,13 +72,15 @@ fn round_trip_hello() {
 fn round_trip_files() {
     let _ = env_logger::try_init();
     round_trip_file("tests/files/foo.txt");
+    round_trip_file("tests/files/bad-random-data");
 }
 
 #[test]
 fn big_file() {
     let _ = env_logger::try_init();
     decomp_big_file("tests/files/foo.txt.lzma", "tests/files/foo.txt");
     decomp_big_file("tests/files/hugedict.txt.lzma", "tests/files/foo.txt");
+    decomp_big_file("tests/files/bad-random-data.lzma", "tests/files/bad-random-data");
 }
 
 #[test]