import os const tfolder = os.join_path(os.vtmp_dir(), 'v', 'tests', 'os_file_test') const tfile = os.join_path_single(tfolder, 'test_file') fn testsuite_begin() { os.rmdir_all(tfolder) or {} assert !os.is_dir(tfolder) os.mkdir_all(tfolder)! os.chdir(tfolder)! assert os.is_dir(tfolder) } fn testsuite_end() { os.rmdir_all(tfolder) or {} } struct Point { x f64 y f64 z f64 } struct Extended_Point { a f64 b f64 c f64 d f64 e f64 f f64 g f64 h f64 i f64 } enum Color { red green blue } [flag] enum Permissions { read write execute } const ( unit_point = Point{1.0, 1.0, 1.0} another_point = Point{0.25, 2.25, 6.25} extended_point = Extended_Point{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0} another_byte = u8(123) another_color = Color.red another_permission = Permissions.read | .write ) // test_read_bytes_into_newline_text tests reading text from a file with newlines. // This test simulates reading a larger text file step by step into a buffer and // returning on each newline, even before the buffer is full, and reaching EOF before // the buffer is completely filled. fn test_read_bytes_into_newline_text() { mut f := os.open_file(tfile, 'w')! f.write_string('Hello World!\nGood\r morning.')! f.close() f = os.open_file(tfile, 'r')! mut buf := []u8{len: 8} n0 := f.read_bytes_into_newline(mut buf)! assert n0 == 8 n1 := f.read_bytes_into_newline(mut buf)! assert n1 == 5 n2 := f.read_bytes_into_newline(mut buf)! assert n2 == 8 n3 := f.read_bytes_into_newline(mut buf)! assert n3 == 6 f.close() } // test_read_bytes_into_newline_binary tests reading a binary file with NUL bytes. // This test simulates the scenario when a byte stream is read and a newline byte // appears in that stream and an EOF occurs before the buffer is full. fn test_read_bytes_into_newline_binary() { os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w' mut bw := []u8{len: 15} bw[9] = 0xff bw[12] = 10 // newline n0_bytes := bw[0..10] n1_bytes := bw[10..13] n2_bytes := bw[13..] mut f := os.open_file(tfile, 'w')! f.write(bw)! f.close() f = os.open_file(tfile, 'r')! mut buf := []u8{len: 10} n0 := f.read_bytes_into_newline(mut buf)! assert n0 == 10 assert buf[..n0] == n0_bytes n1 := f.read_bytes_into_newline(mut buf)! assert n1 == 3 assert buf[..n1] == n1_bytes n2 := f.read_bytes_into_newline(mut buf)! assert n2 == 2 assert buf[..n2] == n2_bytes f.close() } // test_read_eof_last_read_partial_buffer_fill tests that when reading a file // the end-of-file is detected and results in a none error being returned. This // test simulates file reading where the end-of-file is reached inside an fread // containing data. fn test_read_eof_last_read_partial_buffer_fill() { mut f := os.open_file(tfile, 'w')! bw := []u8{len: 199, init: 5} f.write(bw)! f.close() f = os.open_file(tfile, 'r')! mut br := []u8{len: 100} // Read first 100 bytes of 199 byte file, should fill buffer with no error. n0 := f.read(mut br)! assert n0 == 100 // Read remaining 99 bytes of 199 byte file, should fill buffer with no // error, even though end-of-file was reached. n1 := f.read(mut br)! assert n1 == 99 // Read again, end-of-file was previously reached so should return none // error. if _ := f.read(mut br) { // This is not intended behavior because the read function should // not return a number of bytes read when end-of-file is reached. assert false } else { // Expected an error when received end-of-file. assert err is os.Eof } f.close() } // test_read_eof_last_read_full_buffer_fill tests that when reading a file the // end-of-file is detected and results in a none error being returned. This test // simulates file reading where the end-of-file is reached at the beinning of an // fread that returns no data. fn test_read_eof_last_read_full_buffer_fill() { mut f := os.open_file(tfile, 'w')! bw := []u8{len: 200, init: 5} f.write(bw)! f.close() f = os.open_file(tfile, 'r')! mut br := []u8{len: 100} // Read first 100 bytes of 200 byte file, should fill buffer with no error. n0 := f.read(mut br)! assert n0 == 100 // Read remaining 100 bytes of 200 byte file, should fill buffer with no // error. The end-of-file isn't reached yet, but there is no more data. n1 := f.read(mut br)! assert n1 == 100 // Read again, end-of-file was previously reached so should return none // error. if _ := f.read(mut br) { // This is not intended behavior because the read function should // not return a number of bytes read when end-of-file is reached. assert false } else { // Expect an error at EOF. assert err is os.Eof } f.close() } fn test_write_struct() { os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w' size_of_point := int(sizeof(Point)) mut f := os.open_file(tfile, 'w')! f.write_struct(another_point)! f.close() x := os.read_file(tfile)! pcopy := unsafe { &u8(memdup(&another_point, size_of_point)) } y := unsafe { pcopy.vstring_with_len(size_of_point) } assert x == y $if debug { eprintln(x.bytes()) eprintln(y.bytes()) } } fn test_write_struct_at() { mut f := os.open_file(tfile, 'w')! f.write_struct(extended_point)! f.write_struct_at(another_point, 3)! f.close() f = os.open_file(tfile, 'r')! mut p := Point{} f.read_struct_at(mut p, 3)! f.close() assert p == another_point } fn test_read_struct() { mut f := os.open_file(tfile, 'w')! f.write_struct(another_point)! f.close() f = os.open_file(tfile, 'r')! mut p := Point{} f.read_struct(mut p)! f.close() assert p == another_point } fn test_read_struct_at() { mut f := os.open_file(tfile, 'w')! f.write([u8(1), 2, 3])! f.write_struct(another_point)! f.close() f = os.open_file(tfile, 'r')! mut p := Point{} f.read_struct_at(mut p, 3)! f.close() assert p == another_point } fn test_write_raw() { os.rm(tfile) or {} // FIXME This is a workaround for macos, because the file isn't truncated when open with 'w' size_of_point := int(sizeof(Point)) mut f := os.open_file(tfile, 'w')! f.write_raw(another_point)! f.close() x := os.read_file(tfile)! pcopy := unsafe { &u8(memdup(&another_point, size_of_point)) } y := unsafe { pcopy.vstring_with_len(size_of_point) } assert x == y $if debug { eprintln(x.bytes()) eprintln(y.bytes()) } } fn test_write_raw_at() { mut f := os.open_file(tfile, 'w')! f.write_raw(extended_point)! f.write_raw_at(another_point, 3)! f.close() f = os.open_file(tfile, 'r')! mut p := Point{} f.read_struct_at(mut p, 3)! f.close() assert p == another_point } fn test_write_raw_at_negative_pos() { mut f := os.open_file(tfile, 'w')! if _ := f.write_raw_at(another_point, u64(-1)) { assert false } f.write_raw_at(another_point, u64(-1)) or { assert err.msg() == 'Invalid argument' } f.close() } fn test_read_raw() { mut f := os.open_file(tfile, 'w')! f.write_raw(another_point)! f.write_raw(another_byte)! f.write_raw(another_color)! f.write_raw(another_permission)! f.close() f = os.open_file(tfile, 'r')! p := f.read_raw[Point]()! b := f.read_raw[u8]()! c := f.read_raw[Color]()! x := f.read_raw[Permissions]()! f.close() assert p == another_point assert b == another_byte assert c == another_color assert x == another_permission } fn test_read_raw_at() { mut f := os.open_file(tfile, 'w')! f.write([u8(1), 2, 3])! f.write_raw(another_point)! f.write_raw(another_byte)! f.write_raw(another_color)! f.write_raw(another_permission)! f.close() f = os.open_file(tfile, 'r')! mut at := u64(3) p := f.read_raw_at[Point](at)! at += sizeof(Point) b := f.read_raw_at[u8](at)! at += sizeof(u8) c := f.read_raw_at[Color](at)! at += sizeof(Color) x := f.read_raw_at[Permissions](at)! at += sizeof(Permissions) f.close() assert p == another_point assert b == another_byte assert c == another_color assert x == another_permission } fn test_read_raw_at_negative_pos() { mut f := os.open_file(tfile, 'r')! if _ := f.read_raw_at[Point](u64(-1)) { assert false } f.read_raw_at[Point](u64(-1)) or { assert err.msg() == 'Invalid argument' } f.close() } fn test_seek() { mut f := os.open_file(tfile, 'w')! f.write_raw(another_point)! f.write_raw(another_byte)! f.write_raw(another_color)! f.write_raw(another_permission)! f.close() // println('> ${sizeof(Point)} ${sizeof(byte)} ${sizeof(Color)} ${sizeof(Permissions)}') f = os.open_file(tfile, 'r')! // f.seek(i64(sizeof(Point)), .start)! assert f.tell()! == sizeof(Point) b := f.read_raw[u8]()! assert b == another_byte f.seek(i64(sizeof(Color)), .current)! x := f.read_raw[Permissions]()! assert x == another_permission // f.close() } fn test_tell() { for size in 10 .. 30 { s := 'x'.repeat(size) os.write_file(tfile, s)! fs := os.file_size(tfile) assert int(fs) == size // mut f := os.open_file(tfile, 'r')! f.seek(-5, .end)! pos := f.tell()! f.close() // dump(pos) assert pos == size - 5 } } fn test_reopen() { tfile1 := os.join_path_single(tfolder, 'tfile1') tfile2 := os.join_path_single(tfolder, 'tfile2') os.write_file(tfile1, 'Hello World!\nGood\r morning.\nBye 1.')! os.write_file(tfile2, 'Another file\nAnother line.\nBye 2.')! assert os.file_size(tfile1) > 0 assert os.file_size(tfile2) > 0 mut line_buffer := []u8{len: 1024} mut f2 := os.open(tfile2)! x := f2.read_bytes_into_newline(mut line_buffer)! assert !f2.eof() assert x > 0 assert line_buffer#[..x].bytestr() == 'Another file\n' // Note: after this call, f2 should be using the file `tfile1`: f2.reopen(tfile1, 'r')! assert !f2.eof() z := f2.read(mut line_buffer) or { panic(err) } assert f2.eof() assert z > 0 content := line_buffer#[..z].bytestr() // dump(content) assert content.starts_with('Hello World') assert content.ends_with('Bye 1.') } fn test_eof() { os.write_file(tfile, 'Hello World!\n')! mut f := os.open(tfile)! f.read_bytes(10) assert !f.eof() f.read_bytes(100) assert f.eof() } fn test_open_file_wb_ab() { os.rm(tfile) or {} mut wfile := os.open_file('text.txt', 'wb', 0o666)! wfile.write_string('hello')! wfile.close() assert os.read_file('text.txt')! == 'hello' // mut afile := os.open_file('text.txt', 'ab', 0o666)! afile.write_string('hello')! afile.close() assert os.read_file('text.txt')? == 'hellohello' }