Added file stream API

Added API for streaming file contents over the network using the RSYNC
algorithm from librsync.

Ticket: ENT-12414
Changelog: None
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>

configure.ac

@@ -521,6 +521,21 @@ CF3_WITH_LIBRARY(pcre2, [
   )]
 )
 
+dnl librsync
+
+AC_ARG_WITH([librsync], [AS_HELP_STRING([--with-librsync[[=PATH]]], [Spefify librsync path])], [], [with_librsync=yes])
+
+if test "x$with_librsync" = "xno"; then
+   AC_MSG_ERROR([librsync is required])
+fi
+
+CF3_WITH_LIBRARY(librsync, [
+    AC_CHECK_HEADERS([librsync.h], [], AC_MSG_ERROR(Cannot find librsync))
+    AC_CHECK_HEADERS([librsync_export.h], [], AC_MSG_ERROR(Cannot find librsync))
+    AC_CHECK_LIB(rsync, rs_file_size, [], [AC_MSG_ERROR(Cannot find librsync)])
+  ]
+)
+
 dnl defined for libntech
 
 AC_DEFINE(WITH_PCRE2, 1, [Define if PCRE2 is being used])
@@ -1317,10 +1332,10 @@ dnl ######################################################################
 dnl Collect all the options
 dnl ######################################################################
 
-CORE_CPPFLAGS="$LMDB_CPPFLAGS $TOKYOCABINET_CPPFLAGS $QDBM_CPPFLAGS $PCRE2_CPPFLAGS $OPENSSL_CPPFLAGS $SQLITE3_CPPFLAGS $LIBACL_CPPFLAGS $LIBCURL_CPPFLAGS $LIBYAML_CPPFLAGS $POSTGRESQL_CPPFLAGS $MYSQL_CPPFLAGS $LIBXML2_CPPFLAGS $CPPFLAGS $CFECOMPAT_CPPFLAGS"
-CORE_CFLAGS="$LMDB_CFLAGS $TOKYOCABINET_CFLAGS $QDBM_CFLAGS $PCRE2_CFLAGS $OPENSSL_CFLAGS $SQLITE3_CFLAGS $LIBACL_CFLAGS $LIBCURL_CFLAGS $LIBYAML_CFLAGS $POSTGRESQL_CFLAGS $MYSQL_CFLAGS $LIBXML2_CFLAGS $CFLAGS"
-CORE_LDFLAGS="$LMDB_LDFLAGS $TOKYOCABINET_LDFLAGS $QDBM_LDFLAGS $PCRE2_LDFLAGS $OPENSSL_LDFLAGS $SQLITE3_LDFLAGS $LIBACL_LDFLAGS $LIBCURL_LDFLAGS $LIBYAML_LDFLAGS $POSTGRESQL_LDFLAGS $MYSQL_LDFLAGS $LIBXML2_LDFLAGS $LDFLAGS"
-CORE_LIBS="$LMDB_LIBS $TOKYOCABINET_LIBS $QDBM_LIBS $PCRE2_LIBS $OPENSSL_LIBS $SQLITE3_LIBS $LIBACL_LIBS $LIBCURL_LIBS $LIBYAML_LIBS $POSTGRESQL_LIBS $MYSQL_LIBS $LIBXML2_LIBS $LIBS"
+CORE_CPPFLAGS="$LMDB_CPPFLAGS $TOKYOCABINET_CPPFLAGS $QDBM_CPPFLAGS $PCRE2_CPPFLAGS $OPENSSL_CPPFLAGS $SQLITE3_CPPFLAGS $LIBACL_CPPFLAGS $LIBCURL_CPPFLAGS $LIBRSYNC_CPPFLAGS $LIBYAML_CPPFLAGS $POSTGRESQL_CPPFLAGS $MYSQL_CPPFLAGS $LIBXML2_CPPFLAGS $CPPFLAGS $CFECOMPAT_CPPFLAGS"
+CORE_CFLAGS="$LMDB_CFLAGS $TOKYOCABINET_CFLAGS $QDBM_CFLAGS $PCRE2_CFLAGS $OPENSSL_CFLAGS $SQLITE3_CFLAGS $LIBACL_CFLAGS $LIBCURL_CFLAGS $LIBRSYNC_CFLAGS $LIBYAML_CFLAGS $POSTGRESQL_CFLAGS $MYSQL_CFLAGS $LIBXML2_CFLAGS $CFLAGS"
+CORE_LDFLAGS="$LMDB_LDFLAGS $TOKYOCABINET_LDFLAGS $QDBM_LDFLAGS $PCRE2_LDFLAGS $OPENSSL_LDFLAGS $SQLITE3_LDFLAGS $LIBACL_LDFLAGS $LIBCURL_LDFLAGS $LIBRSYNC_LDFLAGS $LIBYAML_LDFLAGS $POSTGRESQL_LDFLAGS $MYSQL_LDFLAGS $LIBXML2_LDFLAGS $LDFLAGS"
+CORE_LIBS="$LMDB_LIBS $TOKYOCABINET_LIBS $QDBM_LIBS $PCRE2_LIBS $OPENSSL_LIBS $SQLITE3_LIBS $LIBACL_LIBS $LIBCURL_LIBS $LIBRSYNC_LIBS $LIBYAML_LIBS $POSTGRESQL_LIBS $MYSQL_LIBS $LIBXML2_LIBS $LIBS"
 
 dnl ######################################################################
 dnl Make them available to subprojects.

libcfnet/Makefile.am

@@ -46,4 +46,5 @@ libcfnet_la_SOURCES = \
 	server_code.c server_code.h \
 	stat_cache.c stat_cache.h \
 	tls_client.c tls_client.h \
-	tls_generic.c tls_generic.h
+	tls_generic.c tls_generic.h \
+	file_stream.c file_stream.h