--- /dev/null
+++ dyld/dyld-132.13/launch-cache/dsc_iterator.cpp
@@ -0,0 +1,107 @@
+/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*- 
+ *
+ * Copyright (c) 2009 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+
+#include "dsc_iterator.h"
+#include "dyld_cache_format.h"
+#define NO_ULEB
+#include "Architectures.hpp"
+#include "MachOFileAbstraction.hpp"
+#include "CacheFileAbstraction.hpp"
+
+
+namespace dyld {
+
+	// convert an address in the shared region where the cache would normally be mapped, into an address where the cache is currently mapped
+	template <typename E>
+	const uint8_t* mappedAddress(const uint8_t* cache, uint64_t addr)
+	{
+		const dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)cache;
+		const dyldCacheFileMapping<E>* mappings = (dyldCacheFileMapping<E>*)&cache[header->mappingOffset()];
+		for (uint32_t i=0; i < header->mappingCount(); ++i) {
+			if ( (mappings[i].address() <= addr) &&  (addr < (mappings[i].address() + mappings[i].size())) ) {
+				return &cache[mappings[i].file_offset() + addr - mappings[i].address()];
+			}
+		}
+		return NULL;
+	}
+
+	// call the callback block on each segment in this image						  	  
+	template <typename A>
+	void walkSegments(const uint8_t* cache, const char* dylibPath, const uint8_t* machHeader, dyld_shared_cache_iterator_t callback) 
+	{
+		typedef typename A::P		P;	
+		typedef typename A::P::E	E;	
+		const macho_header<P>* mh = (const macho_header<P>*)machHeader;
+		const macho_load_command<P>* const cmds = (macho_load_command<P>*)(machHeader + sizeof(macho_header<P>));
+		const uint32_t cmd_count = mh->ncmds();
+		const macho_load_command<P>* cmd = cmds;
+		for (uint32_t i = 0; i < cmd_count; ++i) {
+			if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
+				macho_segment_command<P>* segCmd = (macho_segment_command<P>*)cmd;
+				const uint8_t* segStartInCache = mappedAddress<E>(cache, segCmd->vmaddr());
+				uint64_t fileOffset = segStartInCache - cache;
+				callback(dylibPath, segCmd->segname(), fileOffset, segCmd->vmsize());
+			}
+			cmd = (const macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
+		}
+	}
+						
+							  
+	// call walkSegments on each image in the cache							  	  
+	template <typename A>
+	int walkImages(const uint8_t* cache, dyld_shared_cache_iterator_t callback) 
+	{
+		typedef typename A::P::E   E;	
+		const dyldCacheHeader<E>* header = (dyldCacheHeader<E>*)cache;
+		const dyldCacheImageInfo<E>* dylibs = (dyldCacheImageInfo<E>*)&cache[header->imagesOffset()];
+		for (uint32_t i=0; i < header->imagesCount(); ++i) {
+			const char* dylibPath  = (char*)cache + dylibs[i].pathFileOffset();
+			const uint8_t* machHeader = mappedAddress<E>(cache, dylibs[i].address());
+			walkSegments<A>(cache, dylibPath, machHeader, callback);
+		}
+		return 0;
+	}
+
+}
+
+
+// Given a pointer to an in-memory copy of a dyld shared cache file,
+// this routine will call the callback block once for each segment
+// in each dylib in the shared cache file.  
+// Returns -1 if there was an error, otherwise 0.
+int dyld_shared_cache_iterate_segments(const void* shared_cache_file, dyld_shared_cache_iterator_t callback)
+{
+	const uint8_t* cache = (uint8_t*)shared_cache_file;
+		 if ( strcmp((char*)cache, "dyld_v1    i386") == 0 ) 
+			return dyld::walkImages<x86>(cache, callback);
+	else if ( strcmp((char*)cache, "dyld_v1  x86_64") == 0 ) 
+			return dyld::walkImages<x86_64>(cache, callback);
+	else if ( strcmp((char*)cache, "dyld_v1     ppc") == 0 ) 
+			return dyld::walkImages<ppc>(cache, callback);
+	else
+		return -1;
+}
+