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authorViliam Mateicka <viliam.mateicka@gmail.com>2008-12-16 21:42:34 +0100
committerViliam Mateicka <viliam.mateicka@gmail.com>2008-12-16 21:42:34 +0100
commitc73ebac4af7a3158189ba82c5eb74ae26e2b1106 (patch)
tree32b460ff927e6e15dcdc49b7c886e494514c8f4a /src/input_archive.c
parent01c591fb84dff8c481dc5dc59420300880e37fcc (diff)
downloadmpd-c73ebac4af7a3158189ba82c5eb74ae26e2b1106.tar.gz
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new archive api, input_archive stream
Diffstat (limited to 'src/input_archive.c')
-rw-r--r--src/input_archive.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/src/input_archive.c b/src/input_archive.c
new file mode 100644
index 000000000..4f573bd78
--- /dev/null
+++ b/src/input_archive.c
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+/* 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
+ */
+
+#include "archive_api.h"
+#include "archive_list.h"
+#include "input_archive.h"
+#include "input_stream.h"
+#include "gcc.h"
+#include "log.h"
+#include "ls.h"
+#include "utils.h"
+
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+#include <glib.h>
+
+typedef struct {
+ const struct archive_plugin *aplugin;
+ const struct input_plugin *iplugin;
+ struct archive_file *file;
+} archive_context;
+
+/**
+ * select correct archive plugin to handle the input stream
+ * may allow stacking of archive plugins. for example for handling
+ * tar.gz a gzip handler opens file (through inputfile stream)
+ * then it opens a tar handler and sets gzip inputstream as
+ * parent_stream so tar plugin fetches file data from gzip
+ * plugin and gzip fetches file from disk
+ */
+static bool
+input_archive_open(struct input_stream *is, const char *pathname)
+{
+ archive_context *arch_ctx;
+ const struct archive_plugin *arplug;
+ char *archive, *filename, *suffix, *pname;
+ bool opened;
+
+ if (pathname[0] != '/')
+ return false;
+
+ pname = g_strdup(pathname);
+ // archive_lookup will modify pname when true is returned
+ if (!archive_lookup(pname, &archive, &filename, &suffix)) {
+ g_debug("not an archive, lookup %s failed\n", pname);
+ g_free(pname);
+ return false;
+ }
+
+ //check which archive plugin to use (by ext)
+ arplug = archive_plugin_from_suffix(suffix);
+ if (!arplug) {
+ g_warning("can't handle archive %s\n",archive);
+ g_free(pname);
+ return false;
+ }
+
+ arch_ctx = (archive_context *) g_malloc(sizeof(archive_context));
+
+ //setup archive plugin pointer
+ arch_ctx->aplugin = arplug;
+ //open archive file
+ arch_ctx->file = arplug->open(archive);
+ //setup fileops
+ arplug->setup_stream(arch_ctx->file, is);
+ //setup input plugin backup
+ arch_ctx->iplugin = is->plugin;
+ is->plugin = &input_plugin_archive;
+
+ //internal handle
+ is->data = arch_ctx;
+
+ //open archive
+ opened = arch_ctx->iplugin->open(is, filename);
+
+ if (!opened) {
+ g_warning("open inarchive file %s failed\n\n",filename);
+ } else {
+ is->ready = true;
+ }
+ g_free(pname);
+ return opened;
+}
+
+static void
+input_archive_close(struct input_stream *is)
+{
+ archive_context *arch_ctx = (archive_context *)is->data;
+ //close archive infile ops
+ arch_ctx->iplugin->close(is);
+ //close archive
+ arch_ctx->aplugin->close(arch_ctx->file);
+ //free private data
+ g_free(arch_ctx);
+}
+
+static bool
+input_archive_seek(struct input_stream *is, off_t offset, int whence)
+{
+ archive_context *arch_ctx = (archive_context *)is->data;
+ return arch_ctx->iplugin->seek(is, offset, whence);
+}
+
+static size_t
+input_archive_read(struct input_stream *is, void *ptr, size_t size)
+{
+ archive_context *arch_ctx = (archive_context *)is->data;
+ assert(ptr != NULL);
+ assert(size > 0);
+ return arch_ctx->iplugin->read(is, ptr, size);
+}
+
+static bool
+input_archive_eof(struct input_stream *is)
+{
+ archive_context *arch_ctx = (archive_context *)is->data;
+ return arch_ctx->iplugin->eof(is);
+}
+
+static int
+input_archive_buffer(struct input_stream *is)
+{
+ archive_context *arch_ctx = (archive_context *)is->data;
+ return arch_ctx->iplugin->buffer(is);
+}
+
+const struct input_plugin input_plugin_archive = {
+ .open = input_archive_open,
+ .close = input_archive_close,
+ .buffer = input_archive_buffer,
+ .read = input_archive_read,
+ .eof = input_archive_eof,
+ .seek = input_archive_seek,
+};