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-rw-r--r--Makefile.am12
-rw-r--r--src/fs/io/GunzipReader.cxx102
-rw-r--r--src/fs/io/GunzipReader.hxx69
-rw-r--r--test/run_gunzip.cxx76
4 files changed, 258 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am
index 2ee505f96..b8179b31a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -529,6 +529,7 @@ libfs_a_CPPFLAGS = $(AM_CPPFLAGS) $(ZLIB_CFLAGS)
if HAVE_ZLIB
libfs_a_SOURCES += \
+ src/fs/io/GunzipReader.cxx src/fs/io/GunzipReader.hxx \
src/fs/io/GzipOutputStream.cxx src/fs/io/GzipOutputStream.hxx
FS_LIBS += $(ZLIB_LIBS)
endif
@@ -1617,12 +1618,21 @@ endif
if HAVE_ZLIB
-noinst_PROGRAMS += test/run_gzip
+noinst_PROGRAMS += test/run_gzip test/run_gunzip
+
test_run_gzip_LDADD = \
libutil.a \
$(FS_LIBS)
test_run_gzip_SOURCES = test/run_gzip.cxx
+test_run_gunzip_SOURCES = test/run_gunzip.cxx \
+ src/Log.cxx src/LogBackend.cxx
+test_run_gunzip_LDADD = \
+ $(GLIB_LIBS) \
+ libutil.a \
+ $(FS_LIBS) \
+ libsystem.a
+
endif
test_dump_text_file_LDADD = \
diff --git a/src/fs/io/GunzipReader.cxx b/src/fs/io/GunzipReader.cxx
new file mode 100644
index 000000000..388b26412
--- /dev/null
+++ b/src/fs/io/GunzipReader.cxx
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "GunzipReader.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+const Domain zlib_domain("zlib");
+
+GunzipReader::GunzipReader(Reader &_next, Error &error)
+ :next(_next), eof(false)
+{
+ z.next_in = nullptr;
+ z.avail_in = 0;
+ z.zalloc = Z_NULL;
+ z.zfree = Z_NULL;
+ z.opaque = Z_NULL;
+
+ int result = inflateInit2(&z, 16 + MAX_WBITS);
+ if (result != Z_OK) {
+ z.opaque = this;
+ error.Set(zlib_domain, result, zError(result));
+ }
+}
+
+GunzipReader::~GunzipReader()
+{
+ if (IsDefined())
+ inflateEnd(&z);
+}
+
+inline bool
+GunzipReader::FillBuffer(Error &error)
+{
+ auto w = buffer.Write();
+ assert(!w.IsEmpty());
+
+ size_t nbytes = next.Read(w.data, w.size, error);
+ if (nbytes == 0)
+ return false;
+
+ buffer.Append(nbytes);
+ return true;
+}
+
+size_t
+GunzipReader::Read(void *data, size_t size, Error &error)
+{
+ if (eof)
+ return 0;
+
+ z.next_out = (Bytef *)data;
+ z.avail_out = size;
+
+ while (true) {
+ int flush = Z_NO_FLUSH;
+
+ auto r = buffer.Read();
+ if (r.IsEmpty()) {
+ if (FillBuffer(error))
+ r = buffer.Read();
+ else if (error.IsDefined())
+ return 0;
+ else
+ flush = Z_FINISH;
+ }
+
+ z.next_in = r.data;
+ z.avail_in = r.size;
+
+ int result = inflate(&z, flush);
+ if (result == Z_STREAM_END) {
+ eof = true;
+ return size - z.avail_out;
+ } else if (result != Z_OK) {
+ error.Set(zlib_domain, result, zError(result));
+ return 0;
+ }
+
+ buffer.Consume(r.size - z.avail_in);
+
+ if (z.avail_out < size)
+ return size - z.avail_out;
+ }
+}
diff --git a/src/fs/io/GunzipReader.hxx b/src/fs/io/GunzipReader.hxx
new file mode 100644
index 000000000..689125a6a
--- /dev/null
+++ b/src/fs/io/GunzipReader.hxx
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_GUNZIP_READER_HXX
+#define MPD_GUNZIP_READER_HXX
+
+#include "check.h"
+#include "Reader.hxx"
+#include "util/StaticFifoBuffer.hxx"
+
+#include <zlib.h>
+
+class Error;
+class Domain;
+
+extern const Domain zlib_domain;
+
+/**
+ * A filter that decompresses data using zlib.
+ */
+class GunzipReader final : public Reader {
+ Reader &next;
+
+ bool eof;
+
+ z_stream z;
+
+ StaticFifoBuffer<Bytef, 4096> buffer;
+
+public:
+ /**
+ * Construct the filter. Call IsDefined() to check whether
+ * the constructor has succeeded. If not, #error will hold
+ * information about the failure.
+ */
+ GunzipReader(Reader &_next, Error &error);
+ ~GunzipReader();
+
+ /**
+ * Check whether the constructor has succeeded.
+ */
+ bool IsDefined() const {
+ return z.opaque == nullptr;
+ }
+
+ /* virtual methods from class Reader */
+ virtual size_t Read(void *data, size_t size, Error &error) override;
+
+private:
+ bool FillBuffer(Error &error);
+};
+
+#endif
diff --git a/test/run_gunzip.cxx b/test/run_gunzip.cxx
new file mode 100644
index 000000000..51bdb532e
--- /dev/null
+++ b/test/run_gunzip.cxx
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "fs/io/GunzipReader.hxx"
+#include "fs/io/FileReader.hxx"
+#include "fs/io/StdioOutputStream.hxx"
+#include "util/Error.hxx"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static bool
+Copy(OutputStream &dest, Reader &src, Error &error)
+{
+ while (true) {
+ char buffer[4096];
+ size_t nbytes = src.Read(buffer, sizeof(buffer), error);
+ if (nbytes == 0)
+ return !error.IsDefined();
+
+ if (!dest.Write(buffer, nbytes, error))
+ return false;
+ }
+}
+
+static bool
+CopyGunzip(OutputStream &dest, Reader &_src, Error &error)
+{
+ GunzipReader src(_src, error);
+ return src.IsDefined() && Copy(dest, src, error);
+}
+
+static bool
+CopyGunzip(FILE *_dest, Path src_path, Error &error)
+{
+ StdioOutputStream dest(_dest);
+ FileReader src(src_path, error);
+ return src.IsDefined() && CopyGunzip(dest, src, error);
+}
+
+int
+main(int argc, gcc_unused char **argv)
+{
+ if (argc != 2) {
+ fprintf(stderr, "Usage: run_gunzip PATH\n");
+ return EXIT_FAILURE;
+ }
+
+ Path path = Path::FromFS(argv[1]);
+
+ Error error;
+ if (!CopyGunzip(stdout, path, error)) {
+ fprintf(stderr, "%s\n", error.GetMessage());
+ return EXIT_FAILURE;
+ }
+
+ return EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 04:18:10 +0000