From 81378d71401f39ced7d275777a6813db0ff04117 Mon Sep 17 00:00:00 2001
From: Mike Buland <mike@xagasoft.com>
Date: Wed, 18 Sep 2024 13:24:38 -0700
Subject: Open is more complete now. It's not fully tested.

It should allow you to open and create arbitrary stream ids, truncate,
exclusive mode, etc.
---
 src/stable/myriad.cpp | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

(limited to 'src/stable/myriad.cpp')

diff --git a/src/stable/myriad.cpp b/src/stable/myriad.cpp
index 4edd004..1bf2301 100644
--- a/src/stable/myriad.cpp
+++ b/src/stable/myriad.cpp
@@ -80,7 +80,31 @@ Bu::MyriadStream Bu::Myriad::create( Bu::Myriad::Mode eMode,
 Bu::MyriadStream Bu::Myriad::open( Bu::Myriad::StreamId iStream,
         Bu::Myriad::Mode eMode )
 {
+    Stream *pStream = NULL;
     Bu::MutexLocker l( mhStream );
+    if( (eMode&Create) )
+    {
+        if( !hStream.has( iStream ) )
+        {
+            if( (eMode&Exclusive) )
+            {
+                throw Bu::MyriadException( MyriadException::noSuchStream,
+                    "Stream exists.");
+            }
+        }
+        else
+        {
+            Bu::MutexLocker l( mAccess );
+            if( iStream >= iLastUsedIndex )
+            {
+                iLastUsedIndex = iStream;
+            }
+            pStream = new Stream( *this, iStream, 0 );
+            pStream->aBlocks.append( __allocateBlock() );
+            hStream.insert( pStream->iStream, pStream );
+            bStructureChanged = true;
+        }
+    }
     if( !hStream.has( iStream ) )
     {
         throw Bu::MyriadException( MyriadException::noSuchStream,
@@ -94,7 +118,15 @@ Bu::MyriadStream Bu::Myriad::open( Bu::Myriad::StreamId iStream,
                 "Backing stream does not support writing.");
         }
     }
-    return Bu::MyriadStream( *this, hStream.get( iStream ), eMode );
+    if( pStream == NULL )
+    {
+        pStream = hStream.get( iStream );
+    }
+    if( (eMode&Truncate) )
+    {
+        pStream->setSize( 0 );
+    }
+    return Bu::MyriadStream( *this, pStream, eMode );
 }
 
 void Bu::Myriad::erase( Bu::Myriad::StreamId /*iStream*/ )
@@ -461,6 +493,7 @@ void Bu::Myriad::writeHeader()
 
     Bu::MyriadStream sHeader( *this, hStream.get( 0 ), Bu::Myriad::Write );
     sHeader.write( mbHeader.getString() );
+    bStructureChanged = false;
 }
 
 int32_t Bu::Myriad::__calcHeaderSize()
@@ -506,6 +539,7 @@ int32_t Bu::Myriad::allocateBlock()
 
 int32_t Bu::Myriad::__allocateBlock()
 {
+    bStructureChanged = true;
     if( lFreeBlocks.isEmpty() )
     {
         // Increase the size of the backing stream
@@ -528,6 +562,7 @@ void Bu::Myriad::releaseBlock( int32_t iBlockId, bool bBlank )
 
 void Bu::Myriad::__releaseBlock( int32_t iBlockId, bool bBlank )
 {
+    bStructureChanged = true;
     lFreeBlocks.append( iBlockId );
     if( bBlank )
     {
@@ -602,8 +637,7 @@ Bu::Myriad::Stream::Stream( Bu::Myriad &rParent, Bu::Myriad::StreamId iStream,
     rParent( rParent ),
     iStream( iStream ),
     iSize( iSize ),
-    iOpenCount( 0 ),
-    bStructureChanged( false )
+    iOpenCount( 0 )
 {
 }
 
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