Implement get_size_of_partition() operation,
which is required by the latest upstream libavb [1].

[1] https://android.googlesource.com/platform/external/avb/+/master/README.md

Signed-off-by: Igor Opaniuk <igor.opan...@linaro.org>
---

Changes for v2:
- changed the return code for the case when out_size_num_bytes is NULL
  (s/AVB_IO_RESULT_ERROR_IO/AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE/g)

 common/avb_verify.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/common/avb_verify.c b/common/avb_verify.c
index f9a00f8..ab5f9aa 100644
--- a/common/avb_verify.c
+++ b/common/avb_verify.c
@@ -699,6 +699,37 @@ static AvbIOResult get_unique_guid_for_partition(AvbOps 
*ops,
 }
 
 /**
+ * get_size_of_partition() - gets the size of a partition identified
+ * by a string name
+ *
+ * @ops: contains AVB ops handlers
+ * @partition: partition name (NUL-terminated UTF-8 string)
+ * @out_size_num_bytes: returns the value of a partition size
+ *
+ * @return:
+ *      AVB_IO_RESULT_OK, on success (GUID found)
+ *      AVB_IO_RESULT_ERROR_IO, out_size_num_bytes is NULL
+ *      AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition was not found
+ */
+static AvbIOResult get_size_of_partition(AvbOps *ops,
+                                        const char *partition,
+                                        u64 *out_size_num_bytes)
+{
+       struct mmc_part *part;
+
+       if (!out_size_num_bytes)
+               return AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE;
+
+       part = get_partition(ops, partition);
+       if (!part)
+               return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION;
+
+       *out_size_num_bytes = part->info.blksz * part->info.size;
+
+       return AVB_IO_RESULT_OK;
+}
+
+/**
  * ============================================================================
  * AVB2.0 AvbOps alloc/initialisation/free
  * ============================================================================
@@ -721,7 +752,7 @@ AvbOps *avb_ops_alloc(int boot_device)
        ops_data->ops.read_is_device_unlocked = read_is_device_unlocked;
        ops_data->ops.get_unique_guid_for_partition =
                get_unique_guid_for_partition;
-
+       ops_data->ops.get_size_of_partition = get_size_of_partition;
        ops_data->mmc_dev = boot_device;
 
        return &ops_data->ops;
-- 
2.7.4

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