From a57134dc2bd259f3dcb959dfd45c96493d577f70 Mon Sep 17 00:00:00 2001
From: bnnm <bananaman255@gmail.com>
Date: Sat, 19 May 2018 11:37:21 +0200
Subject: [PATCH] Add .gwd Ogg [Adagio Cloudburst (PC)]

---
 src/formats.c         |  2 ++
 src/meta/ogg_vorbis.c | 22 ++++++++++++++++++++++
 src/vgmstream.h       |  1 +
 3 files changed, 25 insertions(+)

diff --git a/src/formats.c b/src/formats.c
index aa893007..9ee28ba9 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -135,6 +135,7 @@ static const char* extension_list[] = {
     "gms",
     "gsb",
     "gtd",
+    "gwm",
 
     "hca",
     "hgc1",
@@ -1014,6 +1015,7 @@ static const meta_info meta_info_list[] = {
         {meta_UBI_BAO,              "Ubisoft BAO header"},
         {meta_DSP_SWITCH_AUDIO,     "UE4 Switch Audio header"},
         {meta_TA_AAC_VITA,          "tri-Ace AAC (Vita) header"},
+        {meta_OGG_GWM,              "Ogg Vorbis (GWM header)"},
 
 #ifdef VGM_USE_FFMPEG
         {meta_FFmpeg,               "FFmpeg supported file format"},
diff --git a/src/meta/ogg_vorbis.c b/src/meta/ogg_vorbis.c
index 8041e79b..93b3b955 100644
--- a/src/meta/ogg_vorbis.c
+++ b/src/meta/ogg_vorbis.c
@@ -215,6 +215,17 @@ static void ys8_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, vo
     }
 }
 
+static void gwm_ogg_decryption_callback(void *ptr, size_t size, size_t nmemb, void *datasource) {
+    size_t bytes_read = size*nmemb;
+    ogg_vorbis_streamfile * const ov_streamfile = datasource;
+    int i;
+
+    /* bytes are xor'd with key */
+    for (i = 0; i < bytes_read; i++) {
+        ((uint8_t*)ptr)[i] ^= (uint8_t)ov_streamfile->xor_value;
+    }
+}
+
 /* Ogg Vorbis, by way of libvorbisfile; may contain loop comments */
 VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
     ogg_vorbis_meta_info_t ovmi = {0};
@@ -227,6 +238,7 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
     int is_isd = 0;
     int is_rpgmvo = 0;
     int is_eno = 0;
+    int is_gwm = 0;
 
 
     /* check extension */
@@ -248,6 +260,8 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
         is_rpgmvo = 1;
     } else if (check_extensions(streamFile,"eno")) { /* .eno: Metronomicon (PC) */
         is_eno = 1;
+    } else if (check_extensions(streamFile,"gwm")) { /* .gwm: Adagio: Cloudburst (PC) */
+        is_gwm = 1;
     } else {
         goto fail;
     }
@@ -342,6 +356,14 @@ VGMSTREAM * init_vgmstream_ogg_vorbis(STREAMFILE *streamFile) {
     }
 
 
+    /* check GWM [Adagio: Cloudburst (PC)], encrypted */
+    if (is_gwm) {
+        ovmi.xor_value = 0x5D;
+        ovmi.decryption_callback = gwm_ogg_decryption_callback;
+        ovmi.meta_type = meta_OGG_GWM;
+    }
+
+
     return init_vgmstream_ogg_vorbis_callbacks(streamFile, NULL, start_offset, &ovmi);
 
 fail:
diff --git a/src/vgmstream.h b/src/vgmstream.h
index 01ed8682..fe019961 100644
--- a/src/vgmstream.h
+++ b/src/vgmstream.h
@@ -676,6 +676,7 @@ typedef enum {
     meta_UBI_BAO,           /* Ubisoft BAO */
     meta_DSP_SWITCH_AUDIO,  /* Gal Gun 2 (Switch) */
     meta_TA_AAC_VITA,       /* tri-Ace AAC (Judas Code) */
+    meta_OGG_GWM,           /* Ogg Vorbis with encryption [Metronomicon (PC)] */
 
 #ifdef VGM_USE_FFMPEG
     meta_FFmpeg,