From 3fda6384eb74aaa5aafa34960b6bcbb168f74627 Mon Sep 17 00:00:00 2001
From: Vreixo Formoso Lopes <metalpain2002@yahoo.es>
Date: Wed, 12 Sep 2007 15:46:41 +0000
Subject: [PATCH] Added implementation of a data source for reading from
 drives.

---
 libisoburn/data_source.c | 86 ++++++++++++++++++++++++++++++++++++++++
 libisoburn/isoburn.h     |  9 +++++
 2 files changed, 95 insertions(+)
 create mode 100644 libisoburn/data_source.c

diff --git a/libisoburn/data_source.c b/libisoburn/data_source.c
new file mode 100644
index 00000000..7b9560dd
--- /dev/null
+++ b/libisoburn/data_source.c
@@ -0,0 +1,86 @@
+/*
+  data source for libisoburn.
+
+  Copyright 2007 Vreixo Formoso Lopes <metalpain2002@yahoo.es>
+*/
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "isoburn.h"
+#include "../libisofs/libisofs.h"
+#include "../libburn/libburn.h"
+
+struct disc_data_src {
+ struct burn_drive *d;
+ int nblocks;
+};
+
+static int 
+ds_read_block(struct data_source *src, int lba, unsigned char *buffer)
+{
+ int ret;
+ struct disc_data_src *data;
+ off_t count;
+
+ assert(src && buffer);
+
+ data = (struct disc_data_src*)src->data;
+
+ /* if (lba >= data->nblocks) 
+  *	return BLOCK_OUT_OF_FILE;
+  */
+	
+ ret = burn_read_data(data->d, (off_t) lba * (off_t) 2048, buffer, 2048, &count, 0);
+ if (ret <= 0 )
+   return -1; //error
+
+ return 0;
+}
+	
+static int 
+ds_get_size(struct data_source *src)
+{
+ struct disc_data_src *data;
+
+ assert(src);
+	
+ data = (struct disc_data_src*)src->data;
+ return data->nblocks;
+}
+	
+static void 
+ds_free_data(struct data_source *src)
+{
+ free(src->data);
+}
+
+static struct data_source *
+isoburn_data_source_new(struct burn_drive *d)
+{
+ struct disc_data_src *data;
+ struct data_source *ret;
+
+ assert(d);
+	
+ data = malloc(sizeof(struct disc_data_src));
+ if (!data)
+   return NULL;
+ data->d = d;
+	
+ //TODO should be filled with the size of disc (or track?)
+ data->nblocks = 0;
+	
+ ret = malloc(sizeof(struct data_source));
+ if (!ret) {
+   free(data);
+   return NULL;
+ }
+ ret->refcount = 1;
+ ret->read_block = ds_read_block;
+ ret->get_size = ds_get_size;
+ ret->free_data = ds_free_data;
+ ret->data = data;
+ return ret;
+}
+
diff --git a/libisoburn/isoburn.h b/libisoburn/isoburn.h
index 15df05ff..ebb78c03 100644
--- a/libisoburn/isoburn.h
+++ b/libisoburn/isoburn.h
@@ -123,6 +123,15 @@ int isoburn_find_emulator(struct isoburn **pt,
 */
 int isoburn_set_start_byte(struct isoburn *o, off_t value, int flag);
 
+/** Get a data source suitable for read from a drive using burn_read_data()
+    function.
+    @param d drive to read from. Must be grabbed.
+    @return the data source, NULL on error. Must be freed with libisofs
+            data_source_free() function. Note that that doesn't release the
+            drive.
+*/
+static struct data_source *
+isoburn_data_source_new(struct burn_drive *d);
 
 #endif /* Isoburn_includeD */