// Looks ahead to see if the next character completes the entry. Does not read
// any characters from the reader.
func entryCompleted(r *strings.Reader) bool {
if r.Len() > 0 {
b, _ := r.ReadByte()
r.UnreadByte()
return b == lineSeparator || b == entrySeparator
}
return true
}
func sum(stream *strings.Reader) (s int) {
v, err := stream.ReadByte()
for ; v != 0 && err != os.EOF; v, err = stream.ReadByte() {
s += int(v)
}
return
}
// Attempts to consume the wanted character from the reader. Returns true if
// character was read successfully, false otherwise. If the character could
// not be read, then no characters are consumed from the reader.
func consume(r *strings.Reader, wanted byte) bool {
if r.Len() > 0 {
b, _ := r.ReadByte()
if b == wanted {
return true
}
r.UnreadByte()
}
return false
}
// field is of form: key="value"
func lexField(r *strings.Reader) (string, string, error) {
key := make([]byte, 0, 5)
val := make([]byte, 0, 32)
// read the key
for {
ch, _ := r.ReadByte()
if ch == '=' {
break
}
if ch < 'a' || ch > 'z' { // fail if not ASCII lowercase letter
return "", "", AuthFormatError{"header", "cannot parse header field"}
}
key = append(key, ch)
}
if ch, _ := r.ReadByte(); ch != '"' {
return "", "", AuthFormatError{string(key), "cannot parse value"}
}
// read the value
for {
ch, _ := r.ReadByte()
if ch == '"' {
break
}
// character class is ASCII printable [\x20-\x7E] without \ and "
if ch < 0x20 || ch > 0x7E || ch == '\\' {
return "", "", AuthFormatError{string(key), "cannot parse value"}
}
val = append(val, ch)
}
return string(key), string(val), nil
}
// Tear apart the Authorization header value.
// PAY ATTENTION: this is large and complicated relative to other ones I've seen
// based on Split() using ',', ' ', and '=' in various orders. It is also probably
// correct even if the realm contains a '=', ' ', or '"' character, or if the
// sender uses HT, CR, or LF in their whitespace.
//
// The map that comes back looks like { "qop": "auth", "ns":"00000001", etc... }
func parseAuthorization(auth *strings.Reader) (map[string]string, error) {
parts := map[string]string{}
skipLWS := func(r *strings.Reader) error {
for {
ch, err := r.ReadByte()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
if ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' {
// its white, we skip it and stay in loop
} else {
if err := r.UnreadByte(); err != nil {
return err
}
break
}
}
return nil
}
readName := func(r *strings.Reader) (string, error) {
name := []byte{}
for {
ch, err := r.ReadByte()
if err == io.EOF {
break
}
if err != nil {
return "", err
}
if (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') || ch == '-' {
name = append(name, ch)
} else {
if err := r.UnreadByte(); err != nil {
return "", err
}
break
}
}
if len(name) == 0 {
return "", fmt.Errorf("expected name, got didn't get one")
}
return string(name), nil
}
readValue := func(r *strings.Reader) (string, error) {
ch, err := r.ReadByte()
if err != nil {
return "", err
}
if ch == '"' {
v := []byte{}
for {
ch, err := r.ReadByte()
if err != nil {
return "", fmt.Errorf("premature end of value: %s", err.Error())
}
if ch == '\\' {
ch2, err := r.ReadByte()
if err != nil {
return "", fmt.Errorf("premature end of value: %s", err.Error())
}
v = append(v, ch2)
} else if ch == '"' {
break
} else {
v = append(v, ch)
}
}
return string(v), nil
} else {
r.UnreadByte()
return readName(r) // handles unquoted values, like true/false in the "stale" paramter
}
}
for {
name, err := readName(auth)
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if err := skipLWS(auth); err != nil {
return nil, err
}
eq, err := auth.ReadByte()
if err == io.EOF || eq != '=' {
return nil, fmt.Errorf("Malformed %s parameter, no equals", name)
}
if err := skipLWS(auth); err != nil {
return nil, err
}
val, err := readValue(auth)
if err != nil {
return nil, err
}
parts[name] = val
comma, err := auth.ReadByte()
if err == io.EOF {
break // our exit
}
if err != nil {
return nil, err
}
if comma != ',' {
return nil, fmt.Errorf("expected comma, got %v", comma)
}
if err := skipLWS(auth); err != nil {
if err == io.EOF {
break // our exit, finding an EOF after a value and some whitespace
}
return nil, err
}
}
if testing.Verbose() {
log.Printf("auth header = %#v", parts)
}
return parts, nil
}
// initw read a file .LIF and configure the world with it
func initw(f *os.File) bool {
var r *strings.Reader
var b byte
var x, y, oldy int
input := bufio.NewScanner(f)
input.Scan()
if input.Text() != "#Life 1.05" {
fmt.Fprintf(os.Stderr, "ERROR: The file for initialization the world is not a valid .LIF format\n")
return false
}
header:
// Read header of .LIF
for input.Scan() {
r = strings.NewReader(input.Text())
b, _ = r.ReadByte()
if b != '#' {
fmt.Println(input.Text())
} else {
b, _ = r.ReadByte()
switch b {
case 'D':
{
fmt.Println("Description")
}
case 'N':
{
fmt.Println("Rules Conway R 23/3")
}
case 'R':
{
fmt.Fprintf(os.Stderr, "ERROR: 'R' option not implemented\n")
return false
}
case 'P':
{
s := strings.Split(input.Text(), " ")
x, _ = strconv.Atoi(s[1])
y, _ = strconv.Atoi(s[2])
x += (M / 2)
y += (N / 2)
oldy = y
break header // Exit loop, now only blocks of position and cells
}
default:
{
fmt.Fprintf(os.Stderr, "ERROR: Option in header not implemented\n")
return false
}
}
}
}
var p Point
m := map[Point]int{}
// Read patterns and positions
for input.Scan() {
r = strings.NewReader(input.Text())
b, _ = r.ReadByte()
if b == '#' {
b, _ = r.ReadByte()
if b == 'P' {
s := strings.Split(input.Text(), " ")
x, _ = strconv.Atoi(s[1])
y, _ = strconv.Atoi(s[2])
x += (M / 2)
y += (N / 2)
oldy = y
} else {
fmt.Fprintf(os.Stderr, "ERROR: Expected Position or blocks not config parameters\n")
return false
}
} else {
p.x = x
for cells := int(r.Size()); cells > 0; cells-- {
p.y = y
switch b {
case '.':
{
//m[p] = 0
}
case '*':
{
m[p] = 1
}
default:
{
fmt.Fprintf(os.Stderr, "ERROR: Character not valid, only '.' or '*'\n")
return false
}
}
b, _ = r.ReadByte()
y++
}
}
x++
y = oldy
}
w.Matrix[0] = m
return true
// NOTE: ignoring potential errors from input.Err()
}