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const std = @import("std");
const io = std.io;
const DefaultPrng = std.Random.DefaultPrng;
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
const expectError = std.testing.expectError;
const mem = std.mem;
const fs = std.fs;
const File = std.fs.File;
const native_endian = @import("builtin").target.cpu.arch.endian();
const tmpDir = std.testing.tmpDir;
test "write a file, read it, then delete it" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
var data: [1024]u8 = undefined;
var prng = DefaultPrng.init(std.testing.random_seed);
const random = prng.random();
random.bytes(data[0..]);
const tmp_file_name = "temp_test_file.txt";
{
var file = try tmp.dir.createFile(tmp_file_name, .{});
defer file.close();
var buf_stream = io.bufferedWriter(file.writer());
const st = buf_stream.writer();
try st.print("begin", .{});
try st.writeAll(data[0..]);
try st.print("end", .{});
try buf_stream.flush();
}
{
// Make sure the exclusive flag is honored.
try expectError(File.OpenError.PathAlreadyExists, tmp.dir.createFile(tmp_file_name, .{ .exclusive = true }));
}
{
var file = try tmp.dir.openFile(tmp_file_name, .{});
defer file.close();
const file_size = try file.getEndPos();
const expected_file_size: u64 = "begin".len + data.len + "end".len;
try expectEqual(expected_file_size, file_size);
var buf_stream = io.bufferedReader(file.reader());
const st = buf_stream.reader();
const contents = try st.readAllAlloc(std.testing.allocator, 2 * 1024);
defer std.testing.allocator.free(contents);
try expect(mem.eql(u8, contents[0.."begin".len], "begin"));
try expect(mem.eql(u8, contents["begin".len .. contents.len - "end".len], &data));
try expect(mem.eql(u8, contents[contents.len - "end".len ..], "end"));
}
try tmp.dir.deleteFile(tmp_file_name);
}
test "BitStreams with File Stream" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
const tmp_file_name = "temp_test_file.txt";
{
var file = try tmp.dir.createFile(tmp_file_name, .{});
defer file.close();
var bit_stream = io.bitWriter(native_endian, file.writer());
try bit_stream.writeBits(@as(u2, 1), 1);
try bit_stream.writeBits(@as(u5, 2), 2);
try bit_stream.writeBits(@as(u128, 3), 3);
try bit_stream.writeBits(@as(u8, 4), 4);
try bit_stream.writeBits(@as(u9, 5), 5);
try bit_stream.writeBits(@as(u1, 1), 1);
try bit_stream.flushBits();
}
{
var file = try tmp.dir.openFile(tmp_file_name, .{});
defer file.close();
var bit_stream = io.bitReader(native_endian, file.reader());
var out_bits: u16 = undefined;
try expect(1 == try bit_stream.readBits(u2, 1, &out_bits));
try expect(out_bits == 1);
try expect(2 == try bit_stream.readBits(u5, 2, &out_bits));
try expect(out_bits == 2);
try expect(3 == try bit_stream.readBits(u128, 3, &out_bits));
try expect(out_bits == 3);
try expect(4 == try bit_stream.readBits(u8, 4, &out_bits));
try expect(out_bits == 4);
try expect(5 == try bit_stream.readBits(u9, 5, &out_bits));
try expect(out_bits == 5);
try expect(1 == try bit_stream.readBits(u1, 1, &out_bits));
try expect(out_bits == 1);
try expectError(error.EndOfStream, bit_stream.readBitsNoEof(u1, 1));
}
try tmp.dir.deleteFile(tmp_file_name);
}
test "File seek ops" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
const tmp_file_name = "temp_test_file.txt";
var file = try tmp.dir.createFile(tmp_file_name, .{});
defer {
file.close();
tmp.dir.deleteFile(tmp_file_name) catch {};
}
try file.writeAll(&([_]u8{0x55} ** 8192));
// Seek to the end
try file.seekFromEnd(0);
try expect((try file.getPos()) == try file.getEndPos());
// Negative delta
try file.seekBy(-4096);
try expect((try file.getPos()) == 4096);
// Positive delta
try file.seekBy(10);
try expect((try file.getPos()) == 4106);
// Absolute position
try file.seekTo(1234);
try expect((try file.getPos()) == 1234);
}
test "setEndPos" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
const tmp_file_name = "temp_test_file.txt";
var file = try tmp.dir.createFile(tmp_file_name, .{});
defer {
file.close();
tmp.dir.deleteFile(tmp_file_name) catch {};
}
// Verify that the file size changes and the file offset is not moved
try std.testing.expect((try file.getEndPos()) == 0);
try std.testing.expect((try file.getPos()) == 0);
try file.setEndPos(8192);
try std.testing.expect((try file.getEndPos()) == 8192);
try std.testing.expect((try file.getPos()) == 0);
try file.seekTo(100);
try file.setEndPos(4096);
try std.testing.expect((try file.getEndPos()) == 4096);
try std.testing.expect((try file.getPos()) == 100);
try file.setEndPos(0);
try std.testing.expect((try file.getEndPos()) == 0);
try std.testing.expect((try file.getPos()) == 100);
}
test "updateTimes" {
var tmp = tmpDir(.{});
defer tmp.cleanup();
const tmp_file_name = "just_a_temporary_file.txt";
var file = try tmp.dir.createFile(tmp_file_name, .{ .read = true });
defer {
file.close();
tmp.dir.deleteFile(tmp_file_name) catch {};
}
const stat_old = try file.stat();
// Set atime and mtime to 5s before
try file.updateTimes(
stat_old.atime - 5 * std.time.ns_per_s,
stat_old.mtime - 5 * std.time.ns_per_s,
);
const stat_new = try file.stat();
try expect(stat_new.atime < stat_old.atime);
try expect(stat_new.mtime < stat_old.mtime);
}
test "GenericReader methods can return error.EndOfStream" {
// https://github.com/ziglang/zig/issues/17733
var fbs = std.io.fixedBufferStream("");
try std.testing.expectError(
error.EndOfStream,
fbs.reader().readEnum(enum(u8) { a, b }, .little),
);
try std.testing.expectError(
error.EndOfStream,
fbs.reader().isBytes("foo"),
);
}
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