Add ability to process PNG icons for perceptual hash calculation

LICENSE-THIRD-PARTY

@@ -19,6 +19,7 @@ RetDec uses the following third-party libraries or other resources:
 11) Eigen: http://eigen.tuxfamily.org/index.php?title=Main_Page
 12) cmake-modules: https://github.com/rpavlik/cmake-modules
 13) tlsh: https://github.com/trendmicro/tlsh
+13) stb: https://github.com/nothings/stb
 
 These third-party libraries or other resources are licensed under the
 following licenses:
@@ -973,3 +974,25 @@ DEALINGS IN THE SOFTWARE.
 
      Jonathan Oliver and Jayson Pryde
      http://blog.trendmicro.com/trendlabs-security-intelligence/smart-whitelisting-using-locality-sensitive-hashing/
+
+===============================================================================
+12) stb
+===============================================================================
+
+MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

cmake/options.cmake

@@ -503,6 +503,9 @@ set_if_at_least_one_set(RETDEC_ENABLE_YARAMOD
 set_if_at_least_one_set(RETDEC_ENABLE_TLSH
 		RETDEC_ENABLE_FILEFORMAT)
 
+set_if_at_least_one_set(RETDEC_ENABLE_STB
+		RETDEC_ENABLE_FILEFORMAT)
+
 # Support
 
 set_if_at_least_one_set(RETDEC_ENABLE_SUPPORT_ORDINALS

deps/CMakeLists.txt

@@ -14,6 +14,7 @@ endif()
 set(MSVC_GE $<BOOL:${MSVC}>)
 set(MSVC_CONFIG $<${MSVC_GE}:$<CONFIG>/>)
 
+cond_add_subdirectory(stb RETDEC_ENABLE_STB)
 cond_add_subdirectory(authenticode-parser RETDEC_ENABLE_AUTHENTICODE_PARSER)
 cond_add_subdirectory(capstone RETDEC_ENABLE_CAPSTONE)
 cond_add_subdirectory(elfio RETDEC_ENABLE_ELFIO)

deps/stb/CMakeLists.txt

@@ -0,0 +1,44 @@
+cmake_minimum_required(VERSION 3.13)
+
+project(stb VERSION 1.0.0 LANGUAGES C)
+
+add_library(stb STATIC
+        stb_image.c
+)
+
+add_library(retdec::deps::stb ALIAS stb)
+
+target_include_directories(stb
+        PUBLIC
+                $<BUILD_INTERFACE:${RETDEC_DEPS_DIR}/stb/include>
+                $<INSTALL_INTERFACE:${RETDEC_INSTALL_DEPS_INCLUDE_DIR}>
+        PRIVATE
+                ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+install(
+        DIRECTORY ${RETDEC_DEPS_DIR}/stb/include/
+        DESTINATION ${RETDEC_INSTALL_DEPS_INCLUDE_DIR}
+)
+
+install(TARGETS stb
+        EXPORT stb-targets
+        ARCHIVE DESTINATION ${RETDEC_INSTALL_LIB_DIR}
+        LIBRARY DESTINATION ${RETDEC_INSTALL_LIB_DIR}
+)
+
+install(EXPORT stb-targets
+        FILE "retdec-stb-targets.cmake"
+        NAMESPACE retdec::deps::
+        DESTINATION ${RETDEC_INSTALL_CMAKE_DIR}
+)
+
+configure_file(
+        "retdec-stb-config.cmake"
+        "${CMAKE_CURRENT_LIST_DIR}/retdec-stb-config.cmake"
+        @ONLY
+)
+install(
+        FILES "${CMAKE_CURRENT_LIST_DIR}/retdec-stb-config.cmake"
+        DESTINATION ${RETDEC_INSTALL_CMAKE_DIR}
+)