aboutsummaryrefslogtreecommitdiffstats
path: root/src/archive/bz2_archive_plugin.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/archive/bz2_archive_plugin.c')
-rw-r--r--src/archive/bz2_archive_plugin.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/src/archive/bz2_archive_plugin.c b/src/archive/bz2_archive_plugin.c
new file mode 100644
index 000000000..75b4b1ece
--- /dev/null
+++ b/src/archive/bz2_archive_plugin.c
@@ -0,0 +1,300 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+/**
+ * single bz2 archive handling (requires libbz2)
+ */
+
+#include "config.h"
+#include "archive/bz2_archive_plugin.h"
+#include "archive_api.h"
+#include "input_plugin.h"
+#include "refcount.h"
+
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include <glib.h>
+#include <bzlib.h>
+
+#ifdef HAVE_OLDER_BZIP2
+#define BZ2_bzDecompressInit bzDecompressInit
+#define BZ2_bzDecompress bzDecompress
+#endif
+
+struct bz2_archive_file {
+ struct archive_file base;
+
+ struct refcount ref;
+
+ char *name;
+ bool reset;
+ struct input_stream *istream;
+};
+
+struct bz2_input_stream {
+ struct input_stream base;
+
+ struct bz2_archive_file *archive;
+
+ bool eof;
+
+ bz_stream bzstream;
+
+ char buffer[5000];
+};
+
+static const struct input_plugin bz2_inputplugin;
+
+static inline GQuark
+bz2_quark(void)
+{
+ return g_quark_from_static_string("bz2");
+}
+
+/* single archive handling allocation helpers */
+
+static bool
+bz2_alloc(struct bz2_input_stream *data, GError **error_r)
+{
+ int ret;
+
+ data->bzstream.bzalloc = NULL;
+ data->bzstream.bzfree = NULL;
+ data->bzstream.opaque = NULL;
+
+ data->bzstream.next_in = (void *) data->buffer;
+ data->bzstream.avail_in = 0;
+
+ ret = BZ2_bzDecompressInit(&data->bzstream, 0, 0);
+ if (ret != BZ_OK) {
+ g_free(data);
+
+ g_set_error(error_r, bz2_quark(), ret,
+ "BZ2_bzDecompressInit() has failed");
+ return false;
+ }
+
+ return true;
+}
+
+static void
+bz2_destroy(struct bz2_input_stream *data)
+{
+ BZ2_bzDecompressEnd(&data->bzstream);
+}
+
+/* archive open && listing routine */
+
+static struct archive_file *
+bz2_open(const char *pathname, GError **error_r)
+{
+ struct bz2_archive_file *context;
+ int len;
+
+ context = g_malloc(sizeof(*context));
+ archive_file_init(&context->base, &bz2_archive_plugin);
+ refcount_init(&context->ref);
+
+ //open archive
+ context->istream = input_stream_open(pathname, error_r);
+ if (context->istream == NULL) {
+ g_free(context);
+ return NULL;
+ }
+
+ context->name = g_path_get_basename(pathname);
+
+ //remove suffix
+ len = strlen(context->name);
+ if (len > 4) {
+ context->name[len - 4] = 0; //remove .bz2 suffix
+ }
+
+ return &context->base;
+}
+
+static void
+bz2_scan_reset(struct archive_file *file)
+{
+ struct bz2_archive_file *context = (struct bz2_archive_file *) file;
+ context->reset = true;
+}
+
+static char *
+bz2_scan_next(struct archive_file *file)
+{
+ struct bz2_archive_file *context = (struct bz2_archive_file *) file;
+ char *name = NULL;
+
+ if (context->reset) {
+ name = context->name;
+ context->reset = false;
+ }
+
+ return name;
+}
+
+static void
+bz2_close(struct archive_file *file)
+{
+ struct bz2_archive_file *context = (struct bz2_archive_file *) file;
+
+ if (!refcount_dec(&context->ref))
+ return;
+
+ g_free(context->name);
+
+ input_stream_close(context->istream);
+ g_free(context);
+}
+
+/* single archive handling */
+
+static struct input_stream *
+bz2_open_stream(struct archive_file *file,
+ G_GNUC_UNUSED const char *path, GError **error_r)
+{
+ struct bz2_archive_file *context = (struct bz2_archive_file *) file;
+ struct bz2_input_stream *bis = g_new(struct bz2_input_stream, 1);
+
+ input_stream_init(&bis->base, &bz2_inputplugin);
+
+ bis->archive = context;
+
+ bis->base.ready = true;
+ bis->base.seekable = false;
+
+ if (!bz2_alloc(bis, error_r)) {
+ g_free(bis);
+ return NULL;
+ }
+
+ bis->eof = false;
+
+ refcount_inc(&context->ref);
+
+ return &bis->base;
+}
+
+static void
+bz2_is_close(struct input_stream *is)
+{
+ struct bz2_input_stream *bis = (struct bz2_input_stream *)is;
+
+ bz2_destroy(bis);
+
+ bz2_close(&bis->archive->base);
+
+ g_free(bis);
+}
+
+static bool
+bz2_fillbuffer(struct bz2_input_stream *bis, GError **error_r)
+{
+ size_t count;
+ bz_stream *bzstream;
+
+ bzstream = &bis->bzstream;
+
+ if (bzstream->avail_in > 0)
+ return true;
+
+ count = input_stream_read(bis->archive->istream,
+ bis->buffer, sizeof(bis->buffer),
+ error_r);
+ if (count == 0)
+ return false;
+
+ bzstream->next_in = bis->buffer;
+ bzstream->avail_in = count;
+ return true;
+}
+
+static size_t
+bz2_is_read(struct input_stream *is, void *ptr, size_t length,
+ GError **error_r)
+{
+ struct bz2_input_stream *bis = (struct bz2_input_stream *)is;
+ bz_stream *bzstream;
+ int bz_result;
+ size_t nbytes = 0;
+
+ if (bis->eof)
+ return 0;
+
+ bzstream = &bis->bzstream;
+ bzstream->next_out = ptr;
+ bzstream->avail_out = length;
+
+ do {
+ if (!bz2_fillbuffer(bis, error_r))
+ return 0;
+
+ bz_result = BZ2_bzDecompress(bzstream);
+
+ if (bz_result == BZ_STREAM_END) {
+ bis->eof = true;
+ break;
+ }
+
+ if (bz_result != BZ_OK) {
+ g_set_error(error_r, bz2_quark(), bz_result,
+ "BZ2_bzDecompress() has failed");
+ return 0;
+ }
+ } while (bzstream->avail_out == length);
+
+ nbytes = length - bzstream->avail_out;
+ is->offset += nbytes;
+
+ return nbytes;
+}
+
+static bool
+bz2_is_eof(struct input_stream *is)
+{
+ struct bz2_input_stream *bis = (struct bz2_input_stream *)is;
+
+ return bis->eof;
+}
+
+/* exported structures */
+
+static const char *const bz2_extensions[] = {
+ "bz2",
+ NULL
+};
+
+static const struct input_plugin bz2_inputplugin = {
+ .close = bz2_is_close,
+ .read = bz2_is_read,
+ .eof = bz2_is_eof,
+};
+
+const struct archive_plugin bz2_archive_plugin = {
+ .name = "bz2",
+ .open = bz2_open,
+ .scan_reset = bz2_scan_reset,
+ .scan_next = bz2_scan_next,
+ .open_stream = bz2_open_stream,
+ .close = bz2_close,
+ .suffixes = bz2_extensions
+};
+