func TestPeek(t *testing.T) {
pagesize := os.Getpagesize()
peeks := []int{3, pagesize * 2 / 3, 3, pagesize - 1, 3, pagesize * 13 / 5, 3, 0, 3}
counts := []int{1, 0, 0, 0, 0, 1, 0, 0, 1}
sizes := []int{0, 1, 0, pagesize * 2 / 3, 0, pagesize * 11 / 7, 0, pagesize * 13 / 5, 0}
lastAttempt := 511
incomplete := 255
lastCount := 0
total := incomplete
for _, size := range sizes {
total += size
}
rndr := newrndreader(23, 0, total, io.EOF, nil)
r := bufio.NewReader(rndr)
offset := 0
for i, size := range sizes {
verifypeek(t, r, peeks[i], []error{nil}, rndr, 23, offset, peeks[i], counts[i])
offset = verifyread(t, r, size, []error{nil}, rndr, 23, offset, size)
}
verifypeek(t, r, lastAttempt, []error{io.EOF}, rndr, 23, offset, incomplete, lastCount)
}
func TestReadFlatSnapshot(t *testing.T) {
pagesize := os.Getpagesize()
rndr := newrndreader(23, 0, -1, io.EOF, nil)
r := bufio.NewReader(rndr)
offset := 0
readers := make([]bufio.SnapshotReader, 30)
offsets := make([]int, 30)
rnd := newrnd(42)
for i := 0; i < len(readers); i++ {
rnd.step()
d := rnd.intn(256) + 128
rnd.step()
n := rnd.intn(256) + d + 1
offset = verifyread(t, r, pagesize*n/d, []error{nil}, rndr, 23, offset, pagesize*n/d)
for j := 0; j < i; j++ {
rnd.step()
d := rnd.intn(256) + 128
rnd.step()
n := rnd.intn(256) + d + 1
offsets[j] = verifyread(t, readers[j], pagesize*n/d, []error{nil}, rndr, 23, offsets[j], pagesize*n/d)
}
readers[i] = r.Snapshot()
offsets[i] = offset
}
for i := 0; i < len(readers); i++ {
rnd.step()
d := rnd.intn(256) + 128
rnd.step()
n := rnd.intn(256) + d + 1
offset = verifyread(t, r, pagesize*n/d, []error{nil}, rndr, 23, offset, pagesize*n/d)
for j := i; j < len(readers); j++ {
rnd.step()
d := rnd.intn(256) + 128
rnd.step()
n := rnd.intn(256) + d + 1
offsets[j] = verifyread(t, readers[j], pagesize*n/d, []error{nil}, rndr, 23, offsets[j], pagesize*n/d)
}
readers[i].Close()
readers[i] = nil
offsets[i] = -1
}
}
func TestReadDeepSnapshot(t *testing.T) {
pagesize := os.Getpagesize()
readers := make([]bufio.SnapshotReader, 31)
offsets := make([]int, 31)
rndr := newrndreader(23, 0, -1, io.EOF, nil)
readers[0] = bufio.NewReader(rndr)
offsets[0] = 0
rndk := newrnd(42)
rndj := newrnd(80)
for i := 1; i < len(readers); i++ {
for j := 0; j < i; j++ {
rndk.step()
d := rndk.intn(256) + 128
rndk.step()
n := rndk.intn(256) + d + 1
offsets[j] = verifyread(t, readers[j], pagesize*n/d, []error{nil}, rndr, 23, offsets[j], pagesize*n/d)
}
rndj.step()
j := rndj.intn(i)
readers[i] = readers[j].Snapshot()
offsets[i] = offsets[j]
}
/*
rndi := newrnd(66)
for len(readers) > 1 {
for j := 0; j < len(readers); j++ {
rndk.step()
d := rndk.intn(256) + 128
rndk.step()
n := rndk.intn(256) + d + 1
offsets[j] = verifyread(t, readers[j], pagesize*n/d, []error{nil}, rndr, 23, offsets[j], pagesize*n/d)
}
m := len(readers) - 1
rndi.step()
i := rndi.intn(m) + 1
readers[i].Close()
readers[i], readers[m], readers = readers[m], nil, readers[:m]
offsets[i], offsets = offsets[m], offsets[:m]
}
*/
}
func TestReadSmallSplit(t *testing.T) {
pagesize := os.Getpagesize()
split := pagesize/2 + 1
mutate := func(length int, r *testreader) (n int, err error) {
n = (int(r.offset)/split+1)*split - int(r.offset)
if length < n {
n = length
}
return
}
rndr := newrndreader(23, 0, split*3+1, io.EOF, mutate)
r := bufio.NewReader(rndr)
offset := 0
offset = verifyread(t, r, split-1, []error{nil}, rndr, 23, offset, split-1)
offset = verifyread(t, r, pagesize+3, []error{nil}, rndr, 23, offset, split+1)
offset = verifyread(t, r, pagesize+3, []error{nil}, rndr, 23, offset, split)
offset = verifyread(t, r, 2, []error{io.EOF}, rndr, 23, offset, 1)
}
func TestRead(t *testing.T) {
pagesize := os.Getpagesize()
sizes := []int{0, 1, 0, pagesize * 2 / 3, 0, pagesize * 11 / 7, 0, pagesize * 13 / 5, 0}
incomplete := 255
attempt := 511
total := incomplete
for _, size := range sizes {
total += size
}
rndr := newrndreader(23, 0, total, io.EOF, nil)
r := bufio.NewReader(rndr)
offset := 0
for _, size := range sizes {
offset = verifyread(t, r, size, []error{nil}, rndr, 23, offset, size)
}
offset = verifyread(t, r, attempt, []error{io.EOF}, rndr, 23, offset, incomplete)
}