Minor updates.

README.md

@@ -1,15 +1,35 @@
 # fortran-zstd
 
 A collection of Fortran 2018 interface bindings to selected
-[Zstandard](http://www.zstd.net/) functions (zstd ⩾ 1.5.5). In comparison to
-the original C API, the Fortran interfaces, types, and arguments have been
-converted to snake case. See [COVERAGE](COVERAGE.md) for an overview of bound
-procedures.
+[Zstandard](http://www.zstd.net/) functions (zstd ≥ 1.5.5). In comparison to the
+original C API, the Fortran interfaces, types, and arguments have been converted
+to snake case. See [COVERAGE](COVERAGE.md) for an overview of bound procedures.
 
 ## Build Instructions
 
-The zstd library has to be installed with development headers. Build and
-install the Fortran library using the provided Makefile:
+The zstd library has to be installed with development headers. On FreeBSD, run:
+
+```
+# pkg install archivers/zstd
+```
+
+On Linux, instead:
+
+```
+# apt-get install libzstd1 libzstd-dev
+```
+
+Or, to build and install the zstd library from source:
+
+```
+$ cd /tmp/
+$ git clone --depth 1 https://github.com/facebook/zstd
+$ cd zstd/build/cmake/
+$ cmake --build . --config Release
+$ sudo cmake --install . --prefix /usr/local
+```
+
+Build and install the Fortran library using the provided Makefile:
 
 ```
 $ make

test/test_zstd.f90

@@ -208,9 +208,9 @@ logical function test_stream() result(success)
                 last_chunk = (nbytes < to_read)
 
                 ! Select the flush mode. If the read may not be finished
-                ! (read == toRead) we use ZSTD_E_CONTINUE. If this is the last
-                ! chunk, we use ZSTD_E_END. Zstd optimises the case where the
-                ! first flush mode is ZSTD_E_END, since it knows it is
+                ! (nbytes == to_read) we use ZSTD_E_CONTINUE. If this is the
+                ! last chunk, we use ZSTD_E_END. Zstd optimises the case where
+                ! the first flush mode is ZSTD_E_END, since it knows it is
                 ! compressing the entire source in one pass.
                 if (last_chunk) then
                     mode = ZSTD_E_END
@@ -309,7 +309,7 @@ logical function test_stream() result(success)
                 ! Given a valid frame, zstd won't consume the last byte of the frame
                 ! until it has flushed all of the decompressed data of the frame.
                 ! Therefore, instead of checking if the return code is 0, we can
-                ! decompress just check if input.pos < input.size.
+                ! decompress just check if input%pos < input%size.
                 do while (input%pos < input%size)
                     output = zstd_out_buffer_type(c_loc(buf_out), buf_out_sz, 0)