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#
# Author:: John Keiser (<jkeiser@chef.io>)
# Copyright:: Copyright 2011-2016, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "error"
require_relative "api/memory"
class Chef
module ReservedNames::Win32
class Memory
include Chef::ReservedNames::Win32::API::Memory
extend Chef::ReservedNames::Win32::API::Memory
# local_alloc(length[, flags]) [BLOCK]
# Allocates memory using LocalAlloc
# If BLOCK is specified, the memory will be passed
# to the block and freed afterwards.
def self.local_alloc(length, flags = LPTR, &block)
result = LocalAlloc(flags, length)
if result.null?
Chef::ReservedNames::Win32::Error.raise!
end
# If a block is passed, handle freeing the memory at the end
if !block.nil?
begin
yield result
ensure
local_free(result)
end
else
result
end
end
# local_discard(pointer)
# Discard memory. Equivalent to local_realloc(pointer, 0)
def self.local_discard(pointer)
local_realloc(pointer, 0, LMEM_MOVEABLE)
end
# local_flags(pointer)
# Get lock count and Windows flags for local_alloc allocated memory.
# Use: flags, lock_count = local_flags(pointer)
def self.local_flags(pointer)
result = LocalFlags(pointer)
if result == LMEM_INVALID_HANDLE
Chef::ReservedNames::Win32::Error.raise!
end
[ result & ~LMEM_LOCKCOUNT, result & LMEM_LOCKCOUNT ]
end
# local_free(pointer)
# Free memory allocated using local_alloc
def self.local_free(pointer)
result = LocalFree(pointer)
unless result.null?
Chef::ReservedNames::Win32::Error.raise!
end
end
# local_realloc(pointer, size[, flags])
# Resizes memory allocated using LocalAlloc.
def self.local_realloc(pointer, size, flags = LMEM_MOVEABLE | LMEM_ZEROINIT)
result = LocalReAlloc(pointer, size, flags)
if result.null?
Chef::ReservedNames::Win32::Error.raise!
end
result
end
# local_size(pointer)
# Gets the size of memory allocated using LocalAlloc.
def self.local_size(pointer)
result = LocalSize(pointer)
if result == 0
Chef::ReservedNames::Win32::Error.raise!
end
result
end
def self.local_free_finalizer(pointer)
proc { local_free(pointer) }
end
end
end
end
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