Add support for processing Aaru metadata JSON blocks

include/aaruformat/context.h

@@ -236,6 +236,9 @@ typedef struct aaruformatContext
     size_t         sector_suffix_length;  ///< Length of sector_suffix
     size_t         sector_prefix_offset;  ///< Current position in sector_prefix
     size_t         sector_suffix_offset;  ///< Current position in sector_suffix
+
+    AaruMetadataJsonBlockHeader jsonBlockHeader;  ///< JSON metadata block header (if present).
+    uint8_t                    *jsonBlock;        ///< JSON metadata block payload (UTF-8).
 } aaruformatContext;
 
 /** \struct DumpHardwareEntriesWithData

include/aaruformat/enums.h

@@ -153,7 +153,8 @@ typedef enum
     SnapshotBlock                = 0x50414E53,  ///< Block containing a snapshot index (reserved / TODO).
     ParentBlock                  = 0x50524E54,  ///< Block describing how to locate the parent image (reserved / TODO).
     DumpHardwareBlock            = 0x2A504D44,  ///< Block containing an array of hardware used to create the image.
-    TapeFileBlock                = 0x454C4654   ///< Block containing list of files for a tape image (reserved / TODO).
+    TapeFileBlock                = 0x454C4654,  ///< Block containing list of files for a tape image (reserved / TODO).
+    AaruMetadataJsonBlock        = 0x444D534A   ///< Block containing JSON version of Aaru Metadata
 } BlockType;
 
 /**

include/aaruformat/structs/metadata.h

@@ -110,6 +110,18 @@ typedef struct CicmMetadataBlock
     uint32_t length;      ///< Length in bytes of the CICM metadata payload that follows.
 } CicmMetadataBlock;
 
+/** \struct AaruMetadataJsonBlockHeader
+ *  \brief Header for an Aaru metadata JSON block (identifier == BlockType::AaruMetadataJsonBlock).
+ *
+ *  The following 'length' bytes immediately after the header contain the Aaru metadata JSON payload. Encoding is
+ *  typically UTF-8; the payload is not required to be null-terminated.
+ */
+typedef struct AaruMetadataJsonBlockHeader
+{
+    uint32_t identifier;  ///< Block identifier, must be BlockType::AaruMetadataJsonBlock.
+    uint32_t length;      ///< Length in bytes of the Aaru metadata JSON payload that follows.
+} AaruMetadataJsonBlockHeader;
+
 #pragma pack(pop)
 
 #endif  // LIBAARUFORMAT_METADATA_H