Big bang!

.gitignore

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+*.a
+*.o
+.*
+*.swp
+*~
+obj
+cscope.*
+tags

CMakeLists.txt

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+project(parsecat)
+
+cmake_minimum_required(VERSION 3.5)
+
+# Create the compile command database for clang by default
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(CMAKE_MODULE_PATH
+  ${CMAKE_SOURCE_DIR}/cmake/Modules
+)
+
+include(CheckCCompilerFlag)
+if (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
+
+    # add -Wconversion ?
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
+
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-format-attribute -Wcast-align -Wcast-qual")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-missing-field-initializers")
+
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=pointer-arith -Werror=declaration-after-statement")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=implicit-function-declaration -Werror=write-strings")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast")
+    # -Werror=strict-aliasing is broken
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-aliasing -Wstrict-aliasing=2")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-overflow -Wstrict-overflow=5 -Werror=strict-overflow")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE")
+
+    # with -fPIC
+    check_c_compiler_flag("-fPIC" WITH_FPIC)
+    if (WITH_FPIC)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+    endif (WITH_FPIC)
+
+    if (CMAKE_BUILD_TYPE)
+        string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
+        if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
+            check_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" WITH_FORTIFY_SOURCE)
+            if (WITH_FORTIFY_SOURCE)
+                set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
+            endif (WITH_FORTIFY_SOURCE)
+
+            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=uninitialized")
+        endif()
+    endif()
+endif (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
+
+find_package(GnuTLS REQUIRED)
+find_package(Libtasn1 REQUIRED)
+
+add_subdirectory(src)

cmake/Modules/FindLibtasn1.cmake

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+# - Try to find Libtasn1
+# Once done this will define
+#
+#  LIBTASN1_FOUND - system has Libtasn1
+#  LIBTASN1_INCLUDE_DIR - the Libtasn1 include directory
+#  LIBTASN1_LIBRARIES - Link these to use Libtasn1
+#  LIBTASN1_DEFINITIONS - Compiler switches required for using Libtasn1
+#
+#=============================================================================
+#  Copyright (c) 2016 Andreas Schneider <asn@samba.org>
+#
+#  Distributed under the OSI-approved BSD License (the "License");
+#  see accompanying file Copyright.txt for details.
+#
+#  This software is distributed WITHOUT ANY WARRANTY; without even the
+#  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#  See the License for more information.
+#=============================================================================
+#
+
+if (UNIX)
+  find_package(PkgConfig)
+  if (PKG_CONFIG_FOUND)
+    pkg_check_modules(_LIBTASN1 libtasn1)
+  endif (PKG_CONFIG_FOUND)
+endif (UNIX)
+
+find_path(LIBTASN1_INCLUDE_DIR
+    NAMES
+        libtasn1.h
+    PATHS
+        ${_LIBTASN1_INCLUDEDIR}
+)
+
+find_library(TASN1_LIBRARY
+    NAMES
+        tasn1
+    PATHS
+        ${_LIBTASN1_LIBDIR}
+)
+
+if (TASN1_LIBRARY)
+    set(LIBTASN1_LIBRARIES
+        ${LIBTASN1_LIBRARIES}
+        ${TASN1_LIBRARY}
+    )
+endif (TASN1_LIBRARY)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Libtasn1 DEFAULT_MSG LIBTASN1_LIBRARIES LIBTASN1_INCLUDE_DIR)
+
+# show the LIBTASN1_INCLUDE_DIR and LIBTASN1_LIBRARIES variables only in the advanced view
+mark_as_advanced(LIBTASN1_INCLUDE_DIR LIBTASN1_LIBRARIES)
+

src/CMakeLists.txt

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+include_directories(${GNUTLS_INCLUDE_DIR})
+include_directories(${LIBTASN1_INCLUDE_DIR})
+
+add_executable(parsemscat
+               parsemscat.c)
+
+target_link_libraries(parsemscat
+                      ${GNUTLS_LIBRARIES}
+                      ${LIBTASN1_LIBRARIES})
+
+configure_file(mscat.asn ${CMAKE_CURRENT_BINARY_DIR}/mscat.asn COPYONLY)

src/mscat.asn

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+--
+-- ASN.1 Description for Microsoft Catalog Files
+--
+-- Copyright 2016 Andreas Schneider <asn@samba.org>
+-- Copyright 2016 Nikos Mavrogiannopoulos <nmav@redhat.com>
+--
+CATALOG {}
+DEFINITIONS IMPLICIT TAGS ::= -- assuming implicit tags, should try explicit too
+
+BEGIN
+
+SpcSerializedObject ::= SEQUENCE {
+    classID    OCTET STRING,
+    data       OCTET STRING
+}
+
+SpcString ::= CHOICE {
+    unicode    [0] IMPLICIT BMPString,
+    ascii      [1] IMPLICIT IA5String
+}
+
+SpcLink ::= CHOICE { --tags may not be accurate
+    url        [0]    IA5String,
+    moniker    [1]    SpcSerializedObject,
+    file       [2]    SpcString
+}
+
+-- CATALOG_NAME_VALUE
+CatalogNameValue ::= SEQUENCE { -- 180
+    name       BMPString,
+    flags      INTEGER, -- 10010001
+    value      OCTET STRING -- UTF-16-LE
+}
+
+-- CATALOG_MEMBER_INFO
+CatalogMemberInfo ::= SEQUENCE {
+    name       BMPString,
+    id         INTEGER -- 0200
+}
+
+SpcImageDataFile ::= SEQUENCE { -- 458
+    flags BIT STRING,
+    file SpcLink
+}
+
+AlgorithmIdentifier  ::=  SEQUENCE  { -- 500
+     algorithm   OBJECT IDENTIFIER,
+     parameters  [0]    ANY DEFINED BY algorithm OPTIONAL
+}
+
+DigestInfo ::= SEQUENCE { --struct498
+     digestAlgorithm AlgorithmIdentifier,
+     digest OCTET STRING
+}
+
+-- SPC_INDIRECT_DATA
+SpcAttributeTypeAndOptionalValue ::= AlgorithmIdentifier
+
+SpcIndirectDataContent ::= SEQUENCE {
+    data SpcAttributeTypeAndOptionalValue,
+    messageDigest DigestInfo
+}
+
+-- SPC_PE_IMAGE_DATA
+SpcPeImageFlags ::= BIT STRING {
+    includeResources            (0),
+    includeDebugInfo            (1),
+    includeImportAddressTable   (2)
+}
+
+SpcPeImageData ::= SEQUENCE {
+    flags SpcPeImageFlags DEFAULT includeResources,
+    file  SpcLink
+}
+
+-----------------------------------------------------------
+-- CERT_TRUST_LIST STRUCTURE
+-----------------------------------------------------------
+
+CatalogListId ::= SEQUENCE {
+    oid OBJECT IDENTIFIER
+}
+
+CatalogListMemberId ::= SEQUENCE {
+    oid OBJECT IDENTIFIER,
+    optional NULL
+}
+
+MemberAttribute ::= SEQUENCE {
+    oid OBJECT IDENTIFIER,
+    content SET OF ANY
+}
+
+CatalogListMember ::= SEQUENCE {
+    data OCTET STRING,
+    attributes SET OF MemberAttribute OPTIONAL
+}
+
+CatalogAttribute ::= SEQUENCE {
+    oid OBJECT IDENTIFIER,
+    encapsulated_data OCTET STRING -- encapsulates CatNameValue or SpcPeImageData
+}
+
+CertTrustList ::= SEQUENCE {
+    catalogListId CatalogListId,
+    unkownString OCTET STRING, -- 16 bytes MD5 hash?
+    trustUtcTime UTCTime,
+    catalogListMemberId CatalogListMemberId,
+    members SEQUENCE OF CatalogListMember,
+    attributes [0] EXPLICIT SEQUENCE OF CatalogAttribute OPTIONAL
+}
+
+END