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authorViliam Mateicka <viliam.mateicka@gmail.com>2008-12-16 21:45:59 +0100
committerViliam Mateicka <viliam.mateicka@gmail.com>2008-12-16 21:45:59 +0100
commit98fd9b7da8547efe81d473371bb3ca7620c7b2b2 (patch)
treebdd2d95aaadf8c75b352630b2c65c495a2f11832 /src/archive/bz2_plugin.c
parent77946a901f1bf7bf7b2dfb5238b14f9d1941d49c (diff)
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archiveapi: archive plugin for BZ2 files
Diffstat (limited to '')
-rw-r--r--src/archive/bz2_plugin.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/src/archive/bz2_plugin.c b/src/archive/bz2_plugin.c
new file mode 100644
index 000000000..00c59c693
--- /dev/null
+++ b/src/archive/bz2_plugin.c
@@ -0,0 +1,303 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2008 Viliam Mateicka <viliam.mateicka@gmail.com>
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/**
+ * single bz2 archive handling (requires libbz2)
+ */
+
+#include "archive_api.h"
+#include "input_stream.h"
+#include "utils.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
+
+#define BZ_BUFSIZE 5000
+
+typedef struct {
+ char *name;
+ bool reset;
+ struct input_stream istream;
+ int last_bz_result;
+ int last_parent_result;
+ bz_stream bzstream;
+ char *buffer;
+} bz2_context;
+
+
+static const struct input_plugin bz2_inputplugin;
+
+/* single archive handling allocation helpers */
+
+static bool
+bz2_alloc(bz2_context *data)
+{
+ data->bzstream.bzalloc = NULL;
+ data->bzstream.bzfree = NULL;
+ data->bzstream.opaque = NULL;
+
+ data->buffer = g_malloc(BZ_BUFSIZE);
+ data->bzstream.next_in = (void *) data->buffer;
+ data->bzstream.avail_in = 0;
+
+ if (BZ2_bzDecompressInit(&data->bzstream, 0, 0) != BZ_OK) {
+ g_free(data->buffer);
+ g_free(data);
+ return false;
+ }
+
+ data->last_bz_result = BZ_OK;
+ data->last_parent_result = 0;
+ return true;
+}
+
+static void
+bz2_destroy(bz2_context *data)
+{
+ BZ2_bzDecompressEnd(&data->bzstream);
+ g_free(data->buffer);
+}
+
+/* archive open && listing routine */
+
+static struct archive_file *
+bz2_open(char * pathname)
+{
+ bz2_context *context;
+ char *name;
+ int len;
+
+ context = g_malloc(sizeof(bz2_context));
+ if (!context) {
+ return NULL;
+ }
+ //open archive
+ if (!input_stream_open(&context->istream, pathname)) {
+ g_warning("failed to open an bzip2 archive %s\n",pathname);
+ g_free(context);
+ return NULL;
+ }
+ //capture filename
+ name = strrchr(pathname, '/');
+ if (name == NULL) {
+ g_warning("failed to get bzip2 name from %s\n",pathname);
+ g_free(context);
+ return NULL;
+ }
+ context->name = g_strdup(name+1);
+ //remove suffix
+ len = strlen(context->name);
+ if (len > 4) {
+ context->name[len-4] = 0; //remove .bz2 suffix
+ }
+ return (struct archive_file *) context;
+}
+
+static void
+bz2_scan_reset(struct archive_file *file)
+{
+ bz2_context *context = (bz2_context *) file;
+ context->reset = true;
+}
+
+static char *
+bz2_scan_next(struct archive_file *file)
+{
+ bz2_context *context = (bz2_context *) file;
+ char *name = NULL;
+ if (context->reset) {
+ name = context->name;
+ context->reset = false;
+ }
+ return name;
+}
+
+static void
+bz2_close(struct archive_file *file)
+{
+ bz2_context *context = (bz2_context *) file;
+ if (context->name)
+ g_free(context->name);
+
+ input_stream_close(&context->istream);
+ g_free(context);
+}
+
+/* single archive handling */
+
+static void
+bz2_setup_stream(struct archive_file *file, struct input_stream *is)
+{
+ bz2_context *context = (bz2_context *) file;
+ //setup file ops
+ is->plugin = &bz2_inputplugin;
+ //insert back reference
+ is->archive = context;
+ is->seekable = false;
+}
+
+
+static bool
+bz2_is_open(struct input_stream *is, G_GNUC_UNUSED const char *url)
+{
+ bz2_context *context = (bz2_context *) is->archive;
+
+ if (!bz2_alloc(context)) {
+ g_warning("alloc bz2 failed\n");
+ return false;
+ }
+ return true;
+}
+
+static void
+bz2_is_close(struct input_stream *is)
+{
+ bz2_context *context = (bz2_context *) is->archive;
+ bz2_destroy(context);
+ is->data = NULL;
+}
+
+static int
+bz2_fillbuffer(bz2_context *context,
+ size_t numBytes)
+{
+ size_t count;
+ bz_stream *bzstream;
+
+ bzstream = &context->bzstream;
+
+ if (bzstream->avail_in > 0)
+ return 0;
+
+ count = input_stream_read(&context->istream,
+ context->buffer, BZ_BUFSIZE);
+
+ if (count == 0) {
+ if (bzstream->avail_out == numBytes)
+ return -1;
+ if (!input_stream_eof(&context->istream))
+ context->last_parent_result = 1;
+ } else {
+ bzstream->next_in = context->buffer;
+ bzstream->avail_in = count;
+ }
+
+ return 0;
+}
+
+static size_t
+bz2_is_read(struct input_stream *is, void *ptr, size_t size)
+{
+ bz2_context *context = (bz2_context *) is->archive;
+ bz_stream *bzstream;
+ int bz_result;
+ size_t numBytes = size;
+ size_t bytesRead = 0;
+
+ if (context->last_bz_result != BZ_OK)
+ return 0;
+ if (context->last_parent_result != 0)
+ return 0;
+
+ bzstream = &context->bzstream;
+ bzstream->next_out = ptr;
+ bzstream->avail_out = numBytes;
+
+ while (bzstream->avail_out != 0) {
+ if (bz2_fillbuffer(context, numBytes) != 0)
+ break;
+
+ bz_result = BZ2_bzDecompress(bzstream);
+
+ if (context->last_bz_result != BZ_OK
+ && bzstream->avail_out == numBytes) {
+ context->last_bz_result = bz_result;
+ break;
+ }
+
+ if (bz_result == BZ_STREAM_END) {
+ context->last_bz_result = bz_result;
+ break;
+ }
+ }
+
+ bytesRead = numBytes - bzstream->avail_out;
+ is->offset += bytesRead;
+
+ return bytesRead;
+}
+
+static bool
+bz2_is_eof(struct input_stream *is)
+{
+ bz2_context *context = (bz2_context *) is->archive;
+
+ if (context->last_bz_result == BZ_STREAM_END) {
+ return true;
+ }
+
+ return false;
+}
+
+static bool
+bz2_is_seek(G_GNUC_UNUSED struct input_stream *is,
+ G_GNUC_UNUSED off_t offset, G_GNUC_UNUSED int whence)
+{
+ return false;
+}
+
+static int
+bz2_is_buffer(G_GNUC_UNUSED struct input_stream *is)
+{
+ return 0;
+}
+
+/* exported structures */
+
+static const char *const bz2_extensions[] = {
+ "bz2",
+ NULL
+};
+
+static const struct input_plugin bz2_inputplugin = {
+ .open = bz2_is_open,
+ .close = bz2_is_close,
+ .read = bz2_is_read,
+ .eof = bz2_is_eof,
+ .seek = bz2_is_seek,
+ .buffer = bz2_is_buffer
+};
+
+const struct archive_plugin bz2_plugin = {
+ .name = "bz2",
+ .open = bz2_open,
+ .scan_reset = bz2_scan_reset,
+ .scan_next = bz2_scan_next,
+ .setup_stream = bz2_setup_stream,
+ .close = bz2_close,
+ .suffixes = bz2_extensions
+};
+