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const std = @import("index.zig");
const io = std.io;
const DefaultPrng = std.rand.DefaultPrng;
const assert = std.debug.assert;
const mem = std.mem;
const os = std.os;
const builtin = @import("builtin");
test "write a file, read it, then delete it" {
var raw_bytes: [200 * 1024]u8 = undefined;
var allocator = &std.heap.FixedBufferAllocator.init(raw_bytes[0..]).allocator;
var data: [1024]u8 = undefined;
var prng = DefaultPrng.init(1234);
prng.random.bytes(data[0..]);
const tmp_file_name = "temp_test_file.txt";
{
var file = try os.File.openWrite(allocator, tmp_file_name);
defer file.close();
var file_out_stream = io.FileOutStream.init(&file);
var buf_stream = io.BufferedOutStream(io.FileOutStream.Error).init(&file_out_stream.stream);
const st = &buf_stream.stream;
try st.print("begin");
try st.write(data[0..]);
try st.print("end");
try buf_stream.flush();
}
{
var file = try os.File.openRead(allocator, tmp_file_name);
defer file.close();
const file_size = try file.getEndPos();
const expected_file_size = "begin".len + data.len + "end".len;
assert(file_size == expected_file_size);
var file_in_stream = io.FileInStream.init(&file);
var buf_stream = io.BufferedInStream(io.FileInStream.Error).init(&file_in_stream.stream);
const st = &buf_stream.stream;
const contents = try st.readAllAlloc(allocator, 2 * 1024);
defer allocator.free(contents);
assert(mem.eql(u8, contents[0.."begin".len], "begin"));
assert(mem.eql(u8, contents["begin".len .. contents.len - "end".len], data));
assert(mem.eql(u8, contents[contents.len - "end".len ..], "end"));
}
try os.deleteFile(allocator, tmp_file_name);
}
test "BufferOutStream" {
var bytes: [100]u8 = undefined;
var allocator = &std.heap.FixedBufferAllocator.init(bytes[0..]).allocator;
var buffer = try std.Buffer.initSize(allocator, 0);
var buf_stream = &std.io.BufferOutStream.init(&buffer).stream;
const x: i32 = 42;
const y: i32 = 1234;
try buf_stream.print("x: {}\ny: {}\n", x, y);
assert(mem.eql(u8, buffer.toSlice(), "x: 42\ny: 1234\n"));
}
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