Implementation of IsoStream for IsoFileSources.

Makefile.am

@@ -23,7 +23,8 @@ src_libisofs_la_SOURCES = \
 	src/messages.c \
 	src/libiso_msgs.h \
 	src/libiso_msgs.c \
-	src/stream.h 
+	src/stream.h  \
+	src/stream.c 
 libinclude_HEADERS = \
 	src/libisofs.h
 

src/image.h

@@ -41,6 +41,4 @@ struct Iso_Image {
     struct libiso_msgs *messenger;
 };
 
-
-
 #endif /*LIBISO_IMAGE_H_*/

src/stream.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2007 Vreixo Formoso
+ * 
+ * This file is part of the libisofs project; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License version 2 as 
+ * published by the Free Software Foundation. See COPYING file for details.
+ */
+
+#include "libisofs.h"
+#include "stream.h"
+#include "fsource.h"
+#include "error.h"
+
+#include <stdlib.h>
+
+typedef struct
+{
+    IsoFileSource *src;
+} _FSrcStream;
+
+static
+int fsrc_open(IsoStream *stream)
+{
+    IsoFileSource *src;
+    if (stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    src = (IsoFileSource*)stream->data;
+    return src->open(src);
+}
+
+static
+int fsrc_close(IsoStream *stream)
+{
+    IsoFileSource *src;
+    if (stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    src = (IsoFileSource*)stream->data;
+    return src->close(src);
+}
+
+static
+off_t fsrc_get_size(IsoStream *stream)
+{
+    struct stat info;
+    IsoFileSource *src;
+    if (stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    src = (IsoFileSource*)stream->data;
+    
+    if (src->lstat(src, &info) < 0) {
+        return (off_t) -1;
+    }
+    
+    return info.st_size;
+}
+
+static 
+int fsrc_read(IsoStream *stream, void *buf, size_t count)
+{
+    IsoFileSource *src;
+    if (stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    src = (IsoFileSource*)stream->data;
+    return src->read(src, buf, count);
+}
+
+static 
+int fsrc_is_repeatable(IsoStream *stream)
+{
+    int ret;
+    struct stat info;
+    IsoFileSource *src;
+    if (stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    src = (IsoFileSource*)stream->data;
+    
+    ret = src->stat(src, &info);
+    if (ret < 0) {
+        return ret; 
+    }
+    if (info.st_mode & (S_IFREG | S_IFBLK)) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+static
+void fsrc_free(IsoStream *stream)
+{
+    IsoFileSource *src;
+    src = (IsoFileSource*)stream->data;
+    iso_file_source_unref(src);
+}
+
+int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
+{
+    int r;
+    struct stat info;
+    IsoStream *str;
+    if (src == NULL || stream == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    
+    r = src->stat(src, &info);
+    if (r < 0) {
+        return r;
+    }
+    if (S_ISDIR(info.st_mode)) {
+        return ISO_FILE_IS_DIR;
+    }
+    
+    str = malloc(sizeof(IsoStream));
+    if (str == NULL) {
+        return ISO_MEM_ERROR;
+    }
+    
+    str->refcount = 1;
+    str->data = src;
+    str->open = fsrc_open;
+    str->close = fsrc_close;
+    str->get_size = fsrc_get_size;
+    str->read = fsrc_read;
+    str->is_repeatable = fsrc_is_repeatable;
+    str->free = fsrc_free;
+    
+    *stream = str;
+    return ISO_SUCCESS;
+}
+
+void iso_stream_ref(IsoStream *stream)
+{
+    ++stream->refcount;
+}
+
+void iso_stream_unref(IsoStream *stream)
+{
+    if (--stream->refcount == 0) {
+        stream->free(stream);
+        free(stream);
+    }
+}

src/stream.h

@@ -11,6 +11,7 @@
 /*
  * Definitions of streams.
  */
+#include "fsource.h"
 
 /*
  * Some functions here will be moved to libisofs.h when we expose 
@@ -37,6 +38,8 @@ struct Iso_Stream
 
     /**
      * Get the size (in bytes) of the stream.
+     * @return
+     *      The size, or -1 on error
      */
     off_t (*get_size)(IsoStream *stream);
 
@@ -59,11 +62,36 @@ struct Iso_Stream
      * 
      * This function doesn't take into account if the file has been modified
      * between the two reads. 
+     * 
+     * @return
+     *     1 if stream is repeatable, 0 if not, < 0 on error
      */
     int (*is_repeatable)(IsoStream *stream);
 
+    /**
+     * Free implementation specific data. Should never be called by user.
+     * Use iso_stream_unref() instead.
+     */
+    void (*free)(IsoStream *stream);
+
     int refcount;
     void *data;
 };
 
+void iso_stream_ref(IsoStream *stream);
+void iso_stream_unref(IsoStream *stream);
+
+/**
+ * Create a stream to read from a IsoFileSource.
+ * The stream will take the ref. to the IsoFileSource, so after a successfully
+ * exectution of this function, you musn't unref() the source, unless you
+ * take an extra ref.
+ * 
+ * @return
+ *      1 sucess, < 0 error
+ *      Possible errors:
+ * 
+ */
+int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream);
+
 #endif /*STREAM_H_*/