From 84c93fbf0f371bcd26893d1c33e3a5bf1a61223e Mon Sep 17 00:00:00 2001
From: Mike Buland <mike@xagasoft.com>
Date: Mon, 30 Sep 2024 10:23:55 -0700
Subject: Forgot about erase, it seems to be working now.

---
 src/stable/myriad.cpp | 24 +++++++++++++++++++++++-
 src/stable/myriad.h   |  4 +++-
 src/tools/myriad.cpp  | 18 ++++++++++++++++++
 3 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/src/stable/myriad.cpp b/src/stable/myriad.cpp
index 0bd2ff2..eba1ebf 100644
--- a/src/stable/myriad.cpp
+++ b/src/stable/myriad.cpp
@@ -129,8 +129,30 @@ Bu::MyriadStream Bu::Myriad::open( Bu::Myriad::StreamId iStream,
     return Bu::MyriadStream( *this, pStream, eMode );
 }
 
-void Bu::Myriad::erase( Bu::Myriad::StreamId /*iStream*/ )
+void Bu::Myriad::erase( Bu::Myriad::StreamId iStream )
 {
+    // For now, let's prevent you from erasing a stream if it's open.
+    Bu::MutexLocker l( mhStream );
+    if( !hStream.has( iStream ) )
+    {
+        throw Bu::MyriadException( Bu::MyriadException::noSuchStream,
+                "No such stream exists.");
+    }
+    Stream *pStream = hStream.get( iStream );
+    Bu::MutexLocker sl( pStream->mAccess );
+    if( pStream->iOpenCount > 0 )
+    {
+        throw Bu::MyriadException( Bu::MyriadException::streamOpen,
+                "Cannot currently erase a stream while it is open.");
+    }
+
+    for( Bu::Array<int32_t>::iterator i = pStream->aBlocks.begin(); i; i++ )
+    {
+        releaseBlock( *i, false );
+    }
+    pStream->aBlocks.clear();
+    hStream.erase( iStream );
+    delete pStream;
 }
 
 void Bu::Myriad::setSize( Bu::Myriad::StreamId iStream,
diff --git a/src/stable/myriad.h b/src/stable/myriad.h
index c3f682d..60c5a39 100644
--- a/src/stable/myriad.h
+++ b/src/stable/myriad.h
@@ -25,6 +25,7 @@ namespace Bu
             invalidParameter,
             invalidBackingStream,
             badMode,
+            streamOpen,
         };
     subExceptionDeclEnd();
 
@@ -68,7 +69,8 @@ namespace Bu
          *   4 -   7:  Size of stream in bytes
          *   8 - ...:  List of blocks in stream (4 bytes per block
          */
-        Myriad( Bu::Stream &rBacking, int32_t iBlockSize=-1, int32_t iPreallocateBlocks=-1 );
+        Myriad( Bu::Stream &rBacking, int32_t iBlockSize=-1,
+                int32_t iPreallocateBlocks=-1 );
         virtual ~Myriad();
 
         MyriadStream create( Mode eMode, int32_t iPreallocateBytes=-1 );
diff --git a/src/tools/myriad.cpp b/src/tools/myriad.cpp
index 1dc73ec..346cd85 100644
--- a/src/tools/myriad.cpp
+++ b/src/tools/myriad.cpp
@@ -20,6 +20,7 @@ enum Mode
     modeCreate,
     modeInfo,
     modeStreamNew,
+    modeStreamErase,
     modeStreamDump,
     modeStreamPut,
     modeStreamGet,
@@ -44,6 +45,8 @@ public:
                 "Display some info about a Myriad file." );
         addOption( eMode, 'n', "new",
                 "Create a new sub-stream in a Myriad file.");
+        addOption( eMode, 'e', "erase",
+                "Erase sub-stream in a Myriad file.");
         addOption( eMode, 'd', "dump",
                 "Display a hexdump of a stream from a Myriad file.");
         addOption( eMode, "get",
@@ -67,6 +70,7 @@ public:
         setOverride( "create", modeCreate );
         setOverride( "info", modeInfo );
         setOverride( "new", modeStreamNew );
+        setOverride( "erase", modeStreamErase );
         setOverride( "dump", modeStreamDump );
         setOverride( "put", modeStreamPut );
         setOverride( "get", modeStreamGet );
@@ -153,6 +157,20 @@ int main( int argc, char *argv[] )
             }
             break;
 
+        case modeStreamErase:
+            if( !opts.sFile.isSet() )
+            {
+                sio << "Please specify a file manipulate." << sio.nl;
+                return 0;
+            }
+            else
+            {
+                File fOut( opts.sFile, File::Write|File::Read );
+                Myriad m( fOut );
+                m.erase( opts.iStream );
+            }
+            break;
+
         case modeStreamDump:
             if( !opts.sFile.isSet() )
             {
-- 
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