expose readSectionUint() for testing

Bug: 190519702
Test: atest bpf_module_test, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Original-Change: https://android-review.googlesource.com/1756850
Merged-In: I772c918d162440de6cc492b2faeafe03340fca11
Change-Id: I772c918d162440de6cc492b2faeafe03340fca11

libbpf_android/Loader.cpp

diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index aa1f3c0..259068a 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -210,7 +210,7 @@
     return -2;
 }
 
-static unsigned int readSectionUint(const char* name, ifstream& elfFile, unsigned int defVal) {
+unsigned int readSectionUint(const char* name, ifstream& elfFile, unsigned int defVal) {
     vector<char> theBytes;
     int ret = readSectionByName(name, elfFile, theBytes);
     if (ret) {

libbpf_android/include/libbpf_android.h

diff --git a/libbpf_android/include/libbpf_android.h b/libbpf_android/include/libbpf_android.h
index 90c9906..640f35b 100644
--- a/libbpf_android/include/libbpf_android.h
+++ b/libbpf_android/include/libbpf_android.h
@@ -29,6 +29,9 @@
 // BPF loader implementation. Loads an eBPF ELF object
 int loadProg(const char* elfPath, bool* isCritical, const char* prefix = "");
 
+// Exposed for testing
+unsigned int readSectionUint(const char* name, std::ifstream& elfFile, unsigned int defVal);
+
 // Wait for bpfloader to load BPF programs.
 static inline void waitForProgsLoaded() {
     // infinite loop until success with 5/10/20/40/60/60/60... delay