test: add corrupt .gz test case for tar unit test

Author: ingve

test/CMakeLists.txt

@@ -226,6 +226,8 @@ add_custom_command(
   COMMAND ${CMAKE_COMMAND} -E tar cf ${CMAKE_CURRENT_BINARY_DIR}/test-multiple.tar ${CMAKE_CURRENT_SOURCE_DIR}/*.py
   COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt ${CMAKE_CURRENT_BINARY_DIR}/test-invalid.tar
   COMMAND ${CMAKE_COMMAND} -E tar czf ${CMAKE_CURRENT_BINARY_DIR}/test.tar.gz ${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt
+  COMMAND ${CMAKE_COMMAND} -E tar czf ${CMAKE_CURRENT_BINARY_DIR}/test-corrupt.gz ${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt
+  COMMAND bash ${TEST}/util/unit/corrupt-tar-gz.sh ${CMAKE_CURRENT_BINARY_DIR}/test.tar.gz ${CMAKE_CURRENT_BINARY_DIR}/test-corrupt.gz
   COMMAND ${CMAKE_COMMAND} -E tar cf ${CMAKE_CURRENT_BINARY_DIR}/test-tar-gz-inside.tar ${CMAKE_CURRENT_BINARY_DIR}/test.tar.gz
 )
 

test/util/unit/corrupt-tar-gz.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+INFILE="$1"
+OUTFILE="$2"
+
+printf '\x0a\x0f\x0a\x0f\x0a\x0f\x0a\x0f' | dd conv=notrunc bs=1 of=$OUTFILE seek=$((`ls -nl $INFILE | awk '{print $5}'` - 8))

test/util/unit/tar_test.cpp

@@ -91,6 +91,20 @@ CASE("Reading invalid tar file")
   close(fd);
 }
 
+CASE("Reading corrupt tar.gz file")
+{
+  tar::Reader r;
+  struct stat st;
+  int res = stat("test-corrupt.gz", &st);
+  EXPECT(res != -1);
+  size_t size = st.st_size;
+  int fd = open("test-corrupt.gz", O_RDONLY);
+  EXPECT_NOT(fd == -1);
+  const uint8_t *mem = (const uint8_t *)mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
+  EXPECT_THROWS_AS(tar::Tar tar = r.decompress(mem, size), tar::Tar_exception);
+  close(fd);
+}
+
 CASE("Reading tar.gz inside tar file")
 {
   tar::Reader r;