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Copy pathbytesconv.go
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546 lines (501 loc) · 13.5 KB
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//go:generate go run bytesconv_table_gen.go
package fasthttp
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"math"
"net"
"net/http"
"strconv"
"sync"
"time"
)
// AppendHTMLEscape appends html-escaped s to dst and returns the extended dst.
func AppendHTMLEscape(dst []byte, s string) []byte {
var (
prev int
sub string
)
for i, n := 0, len(s); i < n; i++ {
sub = ""
switch s[i] {
case '&':
sub = "&"
case '<':
sub = "<"
case '>':
sub = ">"
case '"':
sub = """ // """ is shorter than """.
case '\'':
sub = "'" // "'" is shorter than "'" and apos was not in HTML until HTML5.
}
if sub != "" {
dst = append(dst, s[prev:i]...)
dst = append(dst, sub...)
prev = i + 1
}
}
return append(dst, s[prev:]...)
}
// AppendHTMLEscapeBytes appends html-escaped s to dst and returns
// the extended dst.
func AppendHTMLEscapeBytes(dst, s []byte) []byte {
return AppendHTMLEscape(dst, b2s(s))
}
// AppendIPv4 appends string representation of the given ip v4 to dst
// and returns the extended dst.
func AppendIPv4(dst []byte, ip net.IP) []byte {
ip = ip.To4()
if len(ip) != net.IPv4len {
return append(dst, "non-v4 ip passed to AppendIPv4"...)
}
dst = AppendUint(dst, int(ip[0]))
for i := 1; i < 4; i++ {
dst = append(dst, '.')
dst = AppendUint(dst, int(ip[i]))
}
return dst
}
var errEmptyIPStr = errors.New("empty ip address string")
var httpDateGMT = time.FixedZone("GMT", 0)
// ParseIPv4 parses ip address from ipStr into dst and returns the extended dst.
func ParseIPv4(dst net.IP, ipStr []byte) (net.IP, error) {
if len(ipStr) == 0 {
return dst, errEmptyIPStr
}
if len(dst) < net.IPv4len || len(dst) > net.IPv4len {
dst = make([]byte, net.IPv4len)
}
copy(dst, net.IPv4zero)
dst = dst.To4() // dst is always non-nil here
b := ipStr
for i := range 3 {
n := bytes.IndexByte(b, '.')
if uint(n) >= uint(len(b)) {
return dst, fmt.Errorf("cannot find dot in ip string %q", ipStr)
}
octet, parsed, err := parseIPv4Octet(b[:n])
if err != nil {
if errors.Is(err, errIPv4PartTooLarge) {
return dst, fmt.Errorf("cannot parse ip string %q: ip part cannot exceed 255: parsed %d", ipStr, parsed)
}
return dst, fmt.Errorf("cannot parse ip string %q: %w", ipStr, err)
}
dst[i] = octet
b = b[n+1:]
}
octet, parsed, err := parseIPv4Octet(b)
if err != nil {
if errors.Is(err, errIPv4PartTooLarge) {
return dst, fmt.Errorf("cannot parse ip string %q: ip part cannot exceed 255: parsed %d", ipStr, parsed)
}
return dst, fmt.Errorf("cannot parse ip string %q: %w", ipStr, err)
}
dst[3] = octet
return dst, nil
}
// AppendHTTPDate appends HTTP-compliant (RFC1123) representation of date
// to dst and returns the extended dst.
func AppendHTTPDate(dst []byte, date time.Time) []byte {
date = date.UTC()
year, month, day := date.Date()
if year < 0 || year > 9999 {
dst = date.AppendFormat(dst, time.RFC1123)
copy(dst[len(dst)-3:], strGMT)
return dst
}
hour, minute, sec := date.Clock()
const (
weekdays = "SunMonTueWedThuFriSat"
months = "JanFebMarAprMayJunJulAugSepOctNovDec"
)
w := 3 * int(date.Weekday())
m := 3 * (int(month) - 1)
dst = append(dst, weekdays[w:w+3]...)
dst = append(dst, ',', ' ')
dst = append2Digits(dst, day)
dst = append(dst, ' ')
dst = append(dst, months[m:m+3]...)
dst = append(dst, ' ')
dst = append2Digits(dst, year/100)
dst = append2Digits(dst, year%100)
dst = append(dst, ' ')
dst = append2Digits(dst, hour)
dst = append(dst, ':')
dst = append2Digits(dst, minute)
dst = append(dst, ':')
dst = append2Digits(dst, sec)
return append(dst, ' ', 'G', 'M', 'T')
}
func append2Digits(dst []byte, v int) []byte {
const digits = "0123456789"
return append(dst, digits[v/10], digits[v%10])
}
// ParseHTTPDate parses HTTP-compliant (RFC1123) date.
//
// The obsolete RFC 850 and ANSI C asctime() formats are accepted too,
// as RFC 9110, section 5.6.7 requires.
func ParseHTTPDate(date []byte) (time.Time, error) {
if t, ok := parseRFC1123DateGMT(date); ok {
return t, nil
}
return http.ParseTime(b2s(date))
}
func parseRFC1123DateGMT(b []byte) (time.Time, bool) {
// Expects "Mon, 02 Jan 2006 15:04:05 GMT".
if len(b) != 29 {
return time.Time{}, false
}
if !isWeekday3(b[0], b[1], b[2]) {
return time.Time{}, false
}
if b[3] != ',' || b[4] != ' ' || b[7] != ' ' || b[11] != ' ' ||
b[16] != ' ' || b[19] != ':' || b[22] != ':' || b[25] != ' ' {
return time.Time{}, false
}
if b[26] != 'G' || b[27] != 'M' || b[28] != 'T' {
return time.Time{}, false
}
day, ok := parse2Digits(b[5], b[6])
if !ok || day < 1 || day > 31 {
return time.Time{}, false
}
month, ok := parseMonth3(b[8], b[9], b[10])
if !ok {
return time.Time{}, false
}
year, ok := parse4Digits(b[12], b[13], b[14], b[15])
if !ok {
return time.Time{}, false
}
hour, ok := parse2Digits(b[17], b[18])
if !ok || hour > 23 {
return time.Time{}, false
}
minute, ok := parse2Digits(b[20], b[21])
if !ok || minute > 59 {
return time.Time{}, false
}
second, ok := parse2Digits(b[23], b[24])
if !ok || second > 59 {
return time.Time{}, false
}
t := time.Date(year, month, day, hour, minute, second, 0, httpDateGMT)
// Reject calendar-invalid dates like "31 Feb", which time.Date normalizes.
if t.Year() != year || t.Month() != month || t.Day() != day {
return time.Time{}, false
}
return t, true
}
func isWeekday3(a, b, c byte) bool {
a |= 0x20
b |= 0x20
c |= 0x20
k := uint32(a)<<16 | uint32(b)<<8 | uint32(c)
switch k {
case uint32('m')<<16 | uint32('o')<<8 | uint32('n'),
uint32('t')<<16 | uint32('u')<<8 | uint32('e'),
uint32('w')<<16 | uint32('e')<<8 | uint32('d'),
uint32('t')<<16 | uint32('h')<<8 | uint32('u'),
uint32('f')<<16 | uint32('r')<<8 | uint32('i'),
uint32('s')<<16 | uint32('a')<<8 | uint32('t'),
uint32('s')<<16 | uint32('u')<<8 | uint32('n'):
return true
default:
return false
}
}
func parse2Digits(a, b byte) (int, bool) {
if a < '0' || a > '9' || b < '0' || b > '9' {
return 0, false
}
return int(a-'0')*10 + int(b-'0'), true
}
func parse4Digits(a, b, c, d byte) (int, bool) {
v1, ok := parse2Digits(a, b)
if !ok {
return 0, false
}
v2, ok := parse2Digits(c, d)
if !ok {
return 0, false
}
return v1*100 + v2, true
}
func parseMonth3(a, b, c byte) (time.Month, bool) {
a |= 0x20
b |= 0x20
c |= 0x20
k := uint32(a)<<16 | uint32(b)<<8 | uint32(c)
switch k {
case uint32('j')<<16 | uint32('a')<<8 | uint32('n'):
return time.January, true
case uint32('f')<<16 | uint32('e')<<8 | uint32('b'):
return time.February, true
case uint32('m')<<16 | uint32('a')<<8 | uint32('r'):
return time.March, true
case uint32('a')<<16 | uint32('p')<<8 | uint32('r'):
return time.April, true
case uint32('m')<<16 | uint32('a')<<8 | uint32('y'):
return time.May, true
case uint32('j')<<16 | uint32('u')<<8 | uint32('n'):
return time.June, true
case uint32('j')<<16 | uint32('u')<<8 | uint32('l'):
return time.July, true
case uint32('a')<<16 | uint32('u')<<8 | uint32('g'):
return time.August, true
case uint32('s')<<16 | uint32('e')<<8 | uint32('p'):
return time.September, true
case uint32('o')<<16 | uint32('c')<<8 | uint32('t'):
return time.October, true
case uint32('n')<<16 | uint32('o')<<8 | uint32('v'):
return time.November, true
case uint32('d')<<16 | uint32('e')<<8 | uint32('c'):
return time.December, true
}
return 0, false
}
// AppendUint appends n to dst and returns the extended dst.
func AppendUint(dst []byte, n int) []byte {
if n < 0 {
// developer sanity-check
panic("BUG: int must be positive")
}
return strconv.AppendUint(dst, uint64(n), 10)
}
// ParseUint parses uint from buf.
//
// A value too large for an int is an error rather than a wrapped result, so
// ParseUint accepts exactly the unsigned decimal strings whose value fits in an
// int on the current platform.
func ParseUint(buf []byte) (int, error) {
v, n, err := parseUintBuf(buf)
if n != len(buf) {
return -1, errUnexpectedTrailingChar
}
return v, err
}
var (
errEmptyInt = errors.New("empty integer")
errIPv4PartTooLarge = errors.New("ip part cannot exceed 255")
errUnexpectedFirstChar = errors.New("unexpected first char found: expecting 0-9")
errUnexpectedTrailingChar = errors.New("unexpected trailing char found: expecting 0-9")
errTooLongInt = errors.New("too long int")
)
const (
// maxIntDiv10 is the largest accumulator that can still take another digit.
// Anything above it overflows an int when multiplied by 10.
maxIntDiv10 = math.MaxInt / 10
// maxSafeIntDigits is how many leading decimal digits can never overflow an
// int, whatever the word size: 10**18-1 fits a 64-bit int and 10**9-1 fits a
// 32-bit one. Go defines strconv.IntSize as 32 or 64 and nothing else.
// TestMaxSafeIntDigits checks both halves of that claim on the build's own
// int size.
maxSafeIntDigits = 9 * (strconv.IntSize / 32)
)
func parseUintBuf(b []byte) (int, int, error) {
if len(b) == 0 {
return -1, 0, errEmptyInt
}
v := 0
for i, c := range b {
k := c - '0'
if k > 9 {
if i == 0 {
return -1, i, errUnexpectedFirstChar
}
return v, i, nil
}
vNew := 10*v + int(k)
// Test for overflow before trusting the result. Comparing the product
// against the accumulator afterwards is not enough: 10*v wraps modulo
// the int size and can land back above v, in which case the overflow
// goes unnoticed and a wrong value is returned instead of an error.
// Once v is known to be no larger than maxIntDiv10 the product cannot
// exceed math.MaxInt+2, so the sign test settles the only case left.
// Below maxSafeIntDigits neither can happen, which keeps the whole test
// out of the common path.
if i >= maxSafeIntDigits && (v > maxIntDiv10 || vNew < 0) {
return -1, i, errTooLongInt
}
v = vNew
}
return v, len(b), nil
}
func parseIPv4Octet(b []byte) (byte, int, error) {
if len(b) == 0 {
return 0, 0, errEmptyInt
}
var (
octet byte
parsed int
)
for i := range len(b) {
c := b[i]
k := c - '0'
if k > 9 {
if i == 0 {
return 0, parsed, errUnexpectedFirstChar
}
return 0, parsed, errUnexpectedTrailingChar
}
parsed = parsed*10 + int(k)
if octet > 25 || (octet == 25 && k > 5) {
return 0, parsed, errIPv4PartTooLarge
}
octet = octet*10 + k
}
return octet, parsed, nil
}
// ParseUfloat parses unsigned float from buf.
func ParseUfloat(buf []byte) (float64, error) {
// The implementation of parsing a float string is not easy.
// We believe that the conservative approach is to call strconv.ParseFloat.
// https://github.com/valyala/fasthttp/pull/1865
res, err := strconv.ParseFloat(b2s(buf), 64)
if res < 0 {
return -1, errors.New("negative input is invalid")
}
if err != nil {
return -1, err
}
return res, err
}
var (
errEmptyHexNum = errors.New("empty hex number")
errTooLargeHexNum = errors.New("too large hex number")
)
func readHexInt(r *bufio.Reader) (int, error) {
// Parse the buffered bytes first, so a number that ends inside them
// needs no ReadByte call per digit. The result, the error and the
// consumed bytes are the same as in the loop below.
b, _ := r.Peek(r.Buffered())
var n int
for i, c := range b {
k := int(hex2intTable[c])
if k == 16 {
if i == 0 {
_, _ = r.Discard(1)
return -1, errEmptyHexNum
}
_, _ = r.Discard(i)
return n, nil
}
if i >= maxHexIntChars {
_, _ = r.Discard(i + 1)
return -1, errTooLargeHexNum
}
n = (n << 4) | k
}
var k, i int
n = 0
for {
c, err := r.ReadByte()
if err != nil {
if err == io.EOF && i > 0 {
return n, nil
}
return -1, err
}
k = int(hex2intTable[c])
if k == 16 {
if i == 0 {
return -1, errEmptyHexNum
}
if err := r.UnreadByte(); err != nil {
return -1, err
}
return n, nil
}
if i >= maxHexIntChars {
return -1, errTooLargeHexNum
}
n = (n << 4) | k
i++
}
}
var hexIntBufPool sync.Pool
func writeHexInt(w *bufio.Writer, n int) error {
if n < 0 {
// developer sanity-check
panic("BUG: int must be positive")
}
v := hexIntBufPool.Get()
if v == nil {
v = make([]byte, maxHexIntChars+1)
}
buf := v.([]byte) //nolint:forcetypeassert
i := len(buf) - 1
for {
buf[i] = lowerhex[n&0xf]
n >>= 4
if n == 0 {
break
}
i--
}
_, err := w.Write(buf[i:])
hexIntBufPool.Put(v)
return err
}
const (
upperhex = "0123456789ABCDEF"
lowerhex = "0123456789abcdef"
)
func lowercaseBytes(b []byte) {
for len(b) >= 8 {
storeWord(b, lowercaseWord(loadWord(b)))
b = b[8:]
}
for i := range b {
b[i] = toLowerTable[b[i]]
}
}
// AppendUnquotedArg appends url-decoded src to dst and returns appended dst.
//
// dst may point to src. In this case src will be overwritten.
func AppendUnquotedArg(dst, src []byte) []byte {
return decodeArgAppend(dst, src)
}
// AppendQuotedArg appends url-encoded src to dst and returns appended dst.
func AppendQuotedArg(dst, src []byte) []byte {
i := 0
for i < len(src) && quotedArgShouldEscapeTable[src[i]] == 0 {
i++
}
dst = append(dst, src[:i]...)
for _, c := range src[i:] {
switch {
case c == ' ':
dst = append(dst, '+')
case quotedArgShouldEscapeTable[int(c)] != 0:
dst = append(dst, '%', upperhex[c>>4], upperhex[c&0xf])
default:
dst = append(dst, c)
}
}
return dst
}
func appendQuotedPath(dst, src []byte) []byte {
// Fix issue in https://github.com/golang/go/issues/11202
if len(src) == 1 && src[0] == '*' {
return append(dst, '*')
}
i := 0
for i < len(src) && quotedPathShouldEscapeTable[src[i]] == 0 {
i++
}
dst = append(dst, src[:i]...)
for _, c := range src[i:] {
if quotedPathShouldEscapeTable[c] != 0 {
dst = append(dst, '%', upperhex[c>>4], upperhex[c&0xf])
} else {
dst = append(dst, c)
}
}
return dst
}