Add ReadFully and WriteFully to libbase.
Change-Id: I6b7aa2a93398e7acdd1d74c71d9abed08a72b3c4
diff --git a/base/file.cpp b/base/file.cpp
index a51c5ff..6b19818 100644
--- a/base/file.cpp
+++ b/base/file.cpp
@@ -120,5 +120,29 @@
return result || CleanUpAfterFailedWrite(path);
}
+bool ReadFully(int fd, void* data, size_t byte_count) {
+ uint8_t* p = reinterpret_cast<uint8_t*>(data);
+ size_t remaining = byte_count;
+ while (remaining > 0) {
+ ssize_t n = TEMP_FAILURE_RETRY(read(fd, p, remaining));
+ if (n <= 0) return false;
+ p += n;
+ remaining -= n;
+ }
+ return true;
+}
+
+bool WriteFully(int fd, const void* data, size_t byte_count) {
+ const uint8_t* p = reinterpret_cast<const uint8_t*>(data);
+ size_t remaining = byte_count;
+ while (remaining > 0) {
+ ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, remaining));
+ if (n == -1) return false;
+ p += n;
+ remaining -= n;
+ }
+ return true;
+}
+
} // namespace base
} // namespace android