From bfe6ce8c1e135d209a69185fa76b458f3b10badb Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Wed, 17 Aug 2022 23:06:09 +0200
Subject: [PATCH] Support detecting AIFF format

---
 signature.cpp | 16 ++++++++++++++++
 signature.h   |  1 +
 2 files changed, 17 insertions(+)

diff --git a/signature.cpp b/signature.cpp
index 557947b..43b6515 100644
--- a/signature.cpp
+++ b/signature.cpp
@@ -38,6 +38,13 @@ enum Sig48 : std::uint64_t {
     Xz = 0xFD377A585A00ul,
 };
 
+/*!
+ * \brief Holds 40-bit signatures.
+ */
+enum Sig40 : std::uint64_t {
+    Aiff = 0x464F524D00ul,
+};
+
 /*!
  * \brief Holds 32-bit signatures.
  */
@@ -156,6 +163,11 @@ ContainerFormat parseSignature(std::string_view buffer)
         return ContainerFormat::Xz;
     default:;
     }
+    switch (sig >> 24) { // check 40-bit signatures
+    case Aiff:
+        return ContainerFormat::Aiff;
+    default:;
+    }
     switch (sig >> 32) { // check 32-bit signatures
     case Dirac:
         return ContainerFormat::Dirac;
@@ -360,6 +372,8 @@ std::string_view containerFormatAbbreviation(ContainerFormat containerFormat, Me
         return "ape";
     case ContainerFormat::Midi:
         return "mid";
+    case ContainerFormat::Aiff:
+        return "aiff";
     default:
         return "";
     }
@@ -465,6 +479,8 @@ std::string_view containerFormatName(ContainerFormat containerFormat)
         return "Monkey's Audio";
     case ContainerFormat::Midi:
         return "MIDI";
+    case ContainerFormat::Aiff:
+        return "Audio Interchange File Format";
     default:
         return "unknown";
     }
diff --git a/signature.h b/signature.h
index 846e247..f0f2d3c 100644
--- a/signature.h
+++ b/signature.h
@@ -65,6 +65,7 @@ enum class ContainerFormat : unsigned int {
     Xz, /**< xz compressed file */
     YUV4Mpeg2, /**< YUV4MPEG2 */
     Zip, /**< ZIP archive */
+    Aiff, /**< Audio Interchange File Format */
 };
 
 TAG_PARSER_EXPORT ContainerFormat parseSignature(const char *buffer, std::size_t bufferSize);