# Any kind of entity which can be searched for in a Sequence of Byte
interface BytePattern
# Return the first occurence of `self` in `b`, or -1 if not found
- fun first_index_in(b: SequenceRead[Byte]): Int do return first_index_in_from(b, 0)
+ fun first_index_in(b: SequenceRead[Int]): Int do return first_index_in_from(b, 0)
# Return the first occurence of `self` in `b` starting at `from`, or -1 if not found
- fun first_index_in_from(b: SequenceRead[Byte], from: Int): Int is abstract
+ fun first_index_in_from(b: SequenceRead[Int], from: Int): Int is abstract
# Return the last occurence of `self` in `b`, or -1 if not found
- fun last_index_in(b: SequenceRead[Byte]): Int do return last_index_in_from(b, b.length - 1)
+ fun last_index_in(b: SequenceRead[Int]): Int do return last_index_in_from(b, b.length - 1)
# Return the last occurence of `self` in `b`, or -1 if not found
- fun last_index_in_from(b: SequenceRead[Byte], from: Int): Int is abstract
+ fun last_index_in_from(b: SequenceRead[Int], from: Int): Int is abstract
# Returns the indexes of all the occurences of `self` in `b`
- fun search_all_in(b: SequenceRead[Byte]): SequenceRead[Int] is abstract
+ fun search_all_in(b: SequenceRead[Int]): SequenceRead[Int] is abstract
# Length of the pattern
fun pattern_length: Int is abstract
# Appends `self` to `b`
- fun append_to(b: Sequence[Byte]) is abstract
+ fun append_to(b: Sequence[Int]) is abstract
# Is `self` a prefix for `b` ?
- fun is_prefix(b: SequenceRead[Byte]): Bool is abstract
+ fun is_prefix(b: SequenceRead[Int]): Bool is abstract
# Is `self` a suffix for `b` ?
- fun is_suffix(b: SequenceRead[Byte]): Bool is abstract
+ fun is_suffix(b: SequenceRead[Int]): Bool is abstract
end
-redef class Byte
+redef class Int
super BytePattern
# Write self as a string into `ns` at position `pos`
- private fun add_digest_at(ns: NativeString, pos: Int) do
- var tmp = (0xF0u8 & self) >> 4
- ns[pos] = if tmp >= 0x0Au8 then tmp + 0x37u8 else tmp + 0x30u8
- tmp = 0x0Fu8 & self
- ns[pos + 1] = if tmp >= 0x0Au8 then tmp + 0x37u8 else tmp + 0x30u8
+ private fun add_digest_at(ns: CString, pos: Int) do
+ var tmp = (0xF0 & self) >> 4
+ ns[pos] = if tmp >= 0x0A then tmp + 0x37 else tmp + 0x30
+ tmp = 0x0F & self
+ ns[pos + 1] = if tmp >= 0x0A then tmp + 0x37 else tmp + 0x30
end
# Is `self` a valid hexadecimal digit (in ASCII)
#
# ~~~nit
# intrude import core::bytes
- # assert not '/'.ascii.is_valid_hexdigit
- # assert '0'.ascii.is_valid_hexdigit
- # assert '9'.ascii.is_valid_hexdigit
- # assert not ':'.ascii.is_valid_hexdigit
- # assert not '@'.ascii.is_valid_hexdigit
- # assert 'A'.ascii.is_valid_hexdigit
- # assert 'F'.ascii.is_valid_hexdigit
- # assert not 'G'.ascii.is_valid_hexdigit
- # assert not '`'.ascii.is_valid_hexdigit
- # assert 'a'.ascii.is_valid_hexdigit
- # assert 'f'.ascii.is_valid_hexdigit
- # assert not 'g'.ascii.is_valid_hexdigit
+ # assert not u'/'.is_valid_hexdigit
+ # assert u'0'.is_valid_hexdigit
+ # assert u'9'.is_valid_hexdigit
+ # assert not u':'.is_valid_hexdigit
+ # assert not u'@'.is_valid_hexdigit
+ # assert u'A'.is_valid_hexdigit
+ # assert u'F'.is_valid_hexdigit
+ # assert not u'G'.is_valid_hexdigit
+ # assert not u'`'.is_valid_hexdigit
+ # assert u'a'.is_valid_hexdigit
+ # assert u'f'.is_valid_hexdigit
+ # assert not u'g'.is_valid_hexdigit
# ~~~
private fun is_valid_hexdigit: Bool do
- return (self >= 0x30u8 and self <= 0x39u8) or
- (self >= 0x41u8 and self <= 0x46u8) or
- (self >= 0x61u8 and self <= 0x66u8)
+ return (self >= 0x30 and self <= 0x39) or
+ (self >= 0x41 and self <= 0x46) or
+ (self >= 0x61 and self <= 0x66)
end
# `self` as a hexdigit to its byte value
#
# ~~~nit
# intrude import core::bytes
- # assert 0x39u8.hexdigit_to_byteval == 0x09u8
- # assert 0x43u8.hexdigit_to_byteval == 0x0Cu8
+ # assert 0x39.hexdigit_to_byteval == 0x09
+ # assert 0x43.hexdigit_to_byteval == 0x0C
# ~~~
#
# REQUIRE: `self.is_valid_hexdigit`
- private fun hexdigit_to_byteval: Byte do
- if self >= 0x30u8 and self <= 0x39u8 then
- return self - 0x30u8
- else if self >= 0x41u8 and self <= 0x46u8 then
- return self - 0x37u8
- else if self >= 0x61u8 and self <= 0x66u8 then
- return self - 0x57u8
+ private fun hexdigit_to_byteval: Int do
+ if self >= 0x30 and self <= 0x39 then
+ return self - 0x30
+ else if self >= 0x41 and self <= 0x46 then
+ return self - 0x37
+ else if self >= 0x61 and self <= 0x66 then
+ return self - 0x57
end
# Happens only if the requirement is not met.
# i.e. this abort is here to please the compiler
redef fun append_to(b) do b.push self
- # assert 'b'.ascii.is_suffix("baqsdb".to_bytes)
- # assert not 'b'.ascii.is_suffix("baqsd".to_bytes)
+ # assert u'b'.is_suffix("baqsdb".to_bytes)
+ # assert not u'b'.is_suffix("baqsd".to_bytes)
redef fun is_suffix(b) do return b.length != 0 and b.last == self
- # assert 'b'.ascii.is_prefix("baqsdb".to_bytes)
- # assert not 'b'.ascii.is_prefix("aqsdb".to_bytes)
+ # assert u'b'.is_prefix("baqsdb".to_bytes)
+ # assert not u'b'.is_prefix("aqsdb".to_bytes)
redef fun is_prefix(b) do return b.length != 0 and b.first == self
+
+ # A signed big-endian representation of `self`
+ #
+ # ~~~
+ # assert 1.to_bytes.hexdigest == "01"
+ # assert 255.to_bytes.hexdigest == "FF"
+ # assert 256.to_bytes.hexdigest == "0100"
+ # assert 65535.to_bytes.hexdigest == "FFFF"
+ # assert 65536.to_bytes.hexdigest == "010000"
+ # ~~~
+ #
+ # Negative values are converted to their two's complement.
+ # Be careful as the result can be ambiguous.
+ #
+ # ~~~
+ # assert (-1).to_bytes.hexdigest == "FF"
+ # assert (-32).to_bytes.hexdigest == "E0"
+ # assert (-512).to_bytes.hexdigest == "FE00"
+ # assert (-65794).to_bytes.hexdigest == "FEFEFE"
+ # ~~~
+ #
+ # Optionally, set `n_bytes` to the desired number of bytes in the output.
+ # This setting can disambiguate the result between positive and negative
+ # integers. Be careful with this parameter as the result may overflow.
+ #
+ # ~~~
+ # assert 1.to_bytes(2).hexdigest == "0001"
+ # assert 65535.to_bytes(2).hexdigest == "FFFF"
+ # assert (-1).to_bytes(2).hexdigest == "FFFF"
+ # assert (-512).to_bytes(4).hexdigest == "FFFFFE00"
+ # assert 0x123456.to_bytes(2).hexdigest == "3456"
+ # ~~~
+ #
+ # For 0, a Bytes object with single nul byte is returned (instead of an empty Bytes object).
+ #
+ # ~~~
+ # assert 0.to_bytes.hexdigest == "00"
+ # ~~~
+ #
+ # For positive integers, `Bytes::to_i` can reverse the operation.
+ #
+ # ~~~
+ # assert 1234.to_bytes.to_i == 1234
+ # ~~~
+ #
+ # Require self >= 0
+ fun to_bytes(n_bytes: nullable Int): Bytes do
+
+ # If 0, force using at least one byte
+ if self == 0 and n_bytes == null then n_bytes = 1
+
+ # Compute the len (log256)
+ var len = 1
+ var max = 256
+ var s = self.abs
+ while s >= max do
+ len += 1
+ max *= 256
+ end
+
+ # Two's complement
+ s = self
+ if self < 0 then
+ var ff = 0
+ for j in [0..len[ do
+ ff *= 0x100
+ ff += 0xFF
+ end
+
+ s = ((-self) ^ ff) + 1
+ end
+
+ # Cut long values
+ if n_bytes != null and len > n_bytes then len = n_bytes
+
+ # Allocate the buffer
+ var cap = n_bytes or else len
+ var res = new Bytes.with_capacity(cap)
+
+ var filler = if self < 0 then 0xFF else 0
+ for i in [0..cap[ do res[i] = filler
+
+ # Fill it starting with the end
+ var i = cap
+ var sum = s
+ while i > cap - len do
+ i -= 1
+ res[i] = sum % 256
+ sum /= 256
+ end
+
+ return res
+ end
end
# A buffer containing Byte-manipulation facilities
#
# Uses Copy-On-Write when persisted
class Bytes
- super AbstractArray[Byte]
+ super AbstractArray[Int]
super BytePattern
- # A NativeString being a char*, it can be used as underlying representation here.
- var items: NativeString
+ # A CString being a char*, it can be used as underlying representation here.
+ var items: CString
# Number of bytes in the array
redef var length
# var b = new Bytes.empty
# assert b.to_s == ""
init empty do
- var ns = new NativeString(0)
+ var ns = new CString(0)
init(ns, 0, 0)
end
# Init a `Bytes` with capacity `cap`
init with_capacity(cap: Int) do
- var ns = new NativeString(cap)
+ var ns = new CString(cap)
init(ns, 0, cap)
end
redef fun is_empty do return length == 0
# var b = new Bytes.empty
- # b.add 101u8
- # assert b[0] == 101u8
+ # b.add 101
+ # assert b[0] == 101
redef fun [](i) do
assert i >= 0
assert i < length
fun trim: Bytes do
var st = 0
while st < length do
- if self[st] > 0x20u8 then break
+ if self[st] > 0x20 then break
st += 1
end
if st >= length then return new Bytes.empty
var ed = length - 1
while ed > 0 do
- if self[ed] > 0x20u8 then break
+ if self[ed] > 0x20 then break
ed -= 1
end
return slice(st, ed - st + 1)
end
- # Returns a subset of the content of `self` starting at `from` and of length `count`
+ # Copy a subset of `self` starting at `from` and of `count` bytes
#
# var b = "abcd".to_bytes
# assert b.slice(1, 2).hexdigest == "6263"
return ret
end
- # Returns a copy of `self` starting at `from`
+ # Copy of `self` starting at `from`
#
# var b = "abcd".to_bytes
# assert b.slice_from(1).hexdigest == "626364"
return slice(from, length)
end
- # Returns self as a hexadecimal digest
+ # Reverse the byte array in place
+ #
+ # var b = "abcd".to_bytes
+ # b.reverse
+ # assert b.to_s == "dcba"
+ fun reverse
+ do
+ var l = length
+ for i in [0..l/2[ do
+ var tmp = self[i]
+ self[i] = self[l-i-1]
+ self[l-i-1] = tmp
+ end
+ end
+
+ # Returns self as an hexadecimal digest.
+ #
+ # Also known as plain hexdump or postscript hexdump.
+ #
+ # ~~~
+ # var b = "abcd".to_bytes
+ # assert b.hexdigest == "61626364"
+ # assert b.hexdigest.hexdigest_to_bytes == b
+ # ~~~
fun hexdigest: String do
var elen = length * 2
- var ns = new NativeString(elen)
+ var ns = new CString(elen)
var i = 0
var oi = 0
while i < length do
i += 1
oi += 2
end
- return new FlatString.full(ns, elen, 0, elen - 1, elen)
+ return new FlatString.full(ns, elen, 0, elen)
+ end
+
+ # Return self as a C hexadecimal digest where bytes are prefixed by `\x`
+ #
+ # The output is compatible with literal stream of bytes for most languages
+ # including C and Nit.
+ #
+ # ~~~
+ # var b = "abcd".to_bytes
+ # assert b.chexdigest == "\\x61\\x62\\x63\\x64"
+ # assert b.chexdigest.unescape_to_bytes == b
+ # ~~~
+ fun chexdigest: String do
+ var elen = length * 4
+ var ns = new CString(elen)
+ var i = 0
+ var oi = 0
+ while i < length do
+ ns[oi] = u'\\'
+ ns[oi+1] = u'x'
+ self[i].add_digest_at(ns, oi+2)
+ i += 1
+ oi += 4
+ end
+ return new FlatString.full(ns, elen, 0, elen)
+ end
+
+
+ # Returns self as a stream of bits (0 and 1)
+ #
+ # ~~~
+ # var b = "abcd".to_bytes
+ # assert b.binarydigest == "01100001011000100110001101100100"
+ # assert b.binarydigest.binarydigest_to_bytes == b
+ # ~~~
+ fun binarydigest: String do
+ var elen = length * 8
+ var ns = new CString(elen)
+ var i = 0
+ var oi = 0
+ while i < length do
+ var c = self[i]
+ var b = 128
+ while b > 0 do
+ if c & b == 0 then
+ ns[oi] = u'0'
+ else
+ ns[oi] = u'1'
+ end
+ oi += 1
+ b = b >> 1
+ end
+ i += 1
+ end
+ return new FlatString.full(ns, elen, 0, elen)
+ end
+
+ # Interprets `self` as a big-endian integer (unsigned by default)
+ #
+ # ~~~
+ # var b = "0102".hexdigest_to_bytes
+ # assert b.to_i == 258
+ #
+ # assert "01".hexdigest_to_bytes.to_i == 1
+ # assert "FF".hexdigest_to_bytes.to_i == 255
+ # assert "0000".hexdigest_to_bytes.to_i == 0
+ # ~~~
+ #
+ # If `self.is_empty`, 0 is returned.
+ #
+ # ~~~
+ # assert "".hexdigest_to_bytes.to_i == 0
+ # ~~~
+ #
+ # If `signed == true`, the bytes are read as a signed integer.
+ # As usual, the sign bit is the left most bit, no matter the
+ # `length` of `self`.
+ #
+ # ~~~
+ # assert "01".hexdigest_to_bytes.to_i(true) == 1
+ # assert "FF".hexdigest_to_bytes.to_i(true) == -1
+ # assert "00FF".hexdigest_to_bytes.to_i(true) == 255
+ # assert "E0".hexdigest_to_bytes.to_i(true) == -32
+ # assert "FE00".hexdigest_to_bytes.to_i(true) == -512
+ # assert "FEFEFE".hexdigest_to_bytes.to_i(true) == -65794
+ # ~~~
+ #
+ # `Int::to_bytes` is a loosely reverse method.
+ #
+ # ~~~
+ # assert b.to_i.to_bytes == b
+ # assert (b.to_i + 1).to_bytes.hexdigest == "0103"
+ # assert "0001".hexdigest_to_bytes.to_i.to_bytes.hexdigest == "01"
+ #
+ # assert (-32).to_bytes.to_i(true) == -32
+ # ~~~
+ #
+ # Warning: `Int` might overflow for bytes with more than 60 bits.
+ fun to_i(signed: nullable Bool): Int do
+ var res = 0
+ var i = 0
+ while i < length do
+ res *= 256
+ res += self[i].to_i
+ i += 1
+ end
+
+ # Two's complement is `signed`
+ if signed == true and not_empty and first > 0x80 then
+ var ff = 0
+ for j in [0..length[ do
+ ff *= 0x100
+ ff += 0xFF
+ end
+
+ res = -((res ^ ff) + 1)
+ end
+
+ return res
end
# var b = new Bytes.with_capacity(1)
- # b[0] = 101u8
+ # b[0] = 101
# assert b.to_s == "e"
redef fun []=(i, v) do
if persisted then regen
end
# var b = new Bytes.empty
- # b.add 101u8
+ # b.add 101
# assert b.to_s == "e"
redef fun add(c) do
if persisted then regen
length += 1
end
+ # Adds the UTF-8 representation of `c` to `self`
+ #
+ # var b = new Bytes.empty
+ # b.add_char('A')
+ # b.add_char('キ')
+ # assert b.hexdigest == "41E382AD"
+ fun add_char(c: Char) do
+ if persisted then regen
+ var cln = c.u8char_len
+ var ln = length
+ enlarge(ln + cln)
+ items.set_char_at(length, c)
+ length += cln
+ end
+
+ redef fun has(c)
+ do
+ if not c isa Int then return false
+ return super(c&255)
+ end
+
# var b = new Bytes.empty
- # b.append([104u8, 101u8, 108u8, 108u8, 111u8])
+ # b.append([104, 101, 108, 108, 111])
# assert b.to_s == "hello"
redef fun append(arr) do
if arr isa Bytes then
end
# var b = new Bytes.empty
- # b.append([0x41u8, 0x41u8, 0x18u8])
+ # b.append([0x41, 0x41, 0x18])
# b.pop
# assert b.to_s == "AA"
redef fun pop do
# Regenerates the buffer, necessary when it was persisted
private fun regen do
- var nns = new NativeString(capacity)
+ var nns = new CString(capacity)
items.copy_to(nns, length, 0, 0)
persisted = false
end
# Appends the `ln` first bytes of `ns` to self
- fun append_ns(ns: NativeString, ln: Int) do
+ fun append_ns(ns: CString, ln: Int) do
if persisted then regen
var nlen = length + ln
if nlen > capacity then enlarge(nlen)
end
# Appends `ln` bytes from `ns` starting at index `from` to self
- fun append_ns_from(ns: NativeString, ln, from: Int) do
+ fun append_ns_from(ns: CString, ln, from: Int) do
if persisted then regen
var nlen = length + ln
if nlen > capacity then enlarge(nlen)
length += ln
end
- # Appends the bytes of `s` to `selftextextt`
- fun append_text(s: Text) do
- for i in s.substrings do
- append_ns(i.fast_cstring, i.bytelen)
- end
- end
+ # Appends the bytes of `str` to `self`
+ fun append_text(str: Text) do str.append_to_bytes self
redef fun append_to(b) do b.append self
redef fun enlarge(sz) do
if capacity >= sz then return
persisted = false
+ if capacity < 16 then capacity = 16
while capacity < sz do capacity = capacity * 2 + 2
- var ns = new NativeString(capacity)
+ var ns = new CString(capacity)
items.copy_to(ns, length, 0, 0)
items = ns
end
redef fun to_s do
persisted = true
var b = self
- var r = b.items.to_s_with_length(length)
+ var r = b.items.to_s_unsafe(length, copy=false)
if r != items then persisted = false
return r
end
# Splits the content on self when encountering `b`
#
- # var a = "String is string".to_bytes.split_with('s'.ascii)
+ # var a = "String is string".to_bytes.split_with(u's')
# assert a.length == 3
# assert a[0].hexdigest == "537472696E672069"
# assert a[1].hexdigest == "20"
# Splits `self` in two parts at the first occurence of `b`
#
- # var a = "String is string".to_bytes.split_once_on('s'.ascii)
+ # var a = "String is string".to_bytes.split_once_on(u's')
# assert a[0].hexdigest == "537472696E672069"
# assert a[1].hexdigest == "20737472696E67"
fun split_once_on(b: BytePattern): Array[Bytes] do
# Replaces all the occurences of `this` in `self` by `by`
#
- # var b = "String is string".to_bytes.replace(0x20u8, 0x41u8)
+ # var b = "String is string".to_bytes.replace(0x20, 0x41)
# assert b.hexdigest == "537472696E6741697341737472696E67"
fun replace(pattern: BytePattern, bytes: BytePattern): Bytes do
if is_empty then return new Bytes.empty
# Decode `self` from percent (or URL) encoding to a clear string
#
- # Replace invalid use of '%' with '?'.
+ # Invalid '%' are not decoded.
#
# assert "aBc09-._~".to_bytes.from_percent_encoding == "aBc09-._~".to_bytes
# assert "%25%28%29%3c%20%3e".to_bytes.from_percent_encoding == "%()< >".to_bytes
# assert ".com%2fpost%3fe%3dasdf%26f%3d123".to_bytes.from_percent_encoding == ".com/post?e=asdf&f=123".to_bytes
# assert "%25%28%29%3C%20%3E".to_bytes.from_percent_encoding == "%()< >".to_bytes
- # assert "incomplete %".to_bytes.from_percent_encoding == "incomplete ?".to_bytes
- # assert "invalid % usage".to_bytes.from_percent_encoding == "invalid ? usage".to_bytes
+ # assert "incomplete %".to_bytes.from_percent_encoding == "incomplete %".to_bytes
+ # assert "invalid % usage".to_bytes.from_percent_encoding == "invalid % usage".to_bytes
# assert "%c3%a9%e3%81%82%e3%81%84%e3%81%86".to_bytes.from_percent_encoding == "éあいう".to_bytes
+ # assert "%1 %A %C3%A9A9".to_bytes.from_percent_encoding == "%1 %A éA9".to_bytes
fun from_percent_encoding: Bytes do
var tmp = new Bytes.with_capacity(length)
var pos = 0
while pos < length do
var b = self[pos]
- if b != '%'.ascii then
+ if b != u'%' then
tmp.add b
pos += 1
continue
end
if length - pos < 2 then
- tmp.add '?'.ascii
+ tmp.add u'%'
pos += 1
continue
end
var bn = self[pos + 1]
var bnn = self[pos + 2]
if not bn.is_valid_hexdigit or not bnn.is_valid_hexdigit then
- tmp.add '?'.ascii
+ tmp.add u'%'
pos += 1
continue
end
end
private class BytesIterator
- super IndexedIterator[Byte]
+ super IndexedIterator[Int]
- var tgt: NativeString
+ var tgt: CString
redef var index
#
# ~~~nit
# assert "String".to_bytes isa Bytes
- # assert "String".to_bytes == [83u8, 116u8, 114u8, 105u8, 110u8, 103u8]
+ # assert "String".to_bytes == [83, 116, 114, 105, 110, 103]
# ~~~
fun to_bytes: Bytes do
- var b = new Bytes.with_capacity(bytelen)
+ var b = new Bytes.with_capacity(byte_length)
append_to_bytes b
return b
end
fun append_to_bytes(b: Bytes) do
for s in substrings do
var from = if s isa FlatString then s.first_byte else 0
- b.append_ns_from(s.items, s.bytelen, from)
+ b.append_ns_from(s.items, s.byte_length, from)
end
end
# Returns a new `Bytes` instance with the digest as content
#
- # assert "0B1F4D".hexdigest_to_bytes == [0x0Bu8, 0x1Fu8, 0x4Du8]
+ # assert "0B1F4D".hexdigest_to_bytes == [0x0B, 0x1F, 0x4D]
+ # assert "0B1F4D".hexdigest_to_bytes.hexdigest == "0B1F4D"
+ #
+ # Characters that are not hexadecimal digits are ignored.
+ #
+ # assert "z0B1 F4\nD".hexdigest_to_bytes.hexdigest == "0B1F4D"
+ # assert "\\x0b1 \\xf4d".hexdigest_to_bytes.hexdigest == "0B1F4D"
+ #
+ # When the number of hexadecimal digit is not even, then a leading 0 is
+ # implicitly considered to fill the left byte (the most significant one).
#
- # REQUIRE: `self` is a valid hexdigest and hexdigest.length % 2 == 0
+ # assert "1".hexdigest_to_bytes.hexdigest == "01"
+ # assert "FFF".hexdigest_to_bytes.hexdigest == "0FFF"
+ #
+ # `Bytes::hexdigest` is a loosely reverse method since its
+ # results contain only pairs of uppercase hexadecimal digits.
+ #
+ # assert "ABCD".hexdigest_to_bytes.hexdigest == "ABCD"
+ # assert "a b c".hexdigest_to_bytes.hexdigest == "0ABC"
fun hexdigest_to_bytes: Bytes do
var b = bytes
+ var max = byte_length
+
+ var dlength = 0 # Number of hex digits
var pos = 0
- var max = bytelen
- var ret = new Bytes.with_capacity(max / 2)
while pos < max do
- ret.add((b[pos].hexdigit_to_byteval << 4) |
- b[pos + 1].hexdigit_to_byteval)
- pos += 2
+ var c = b[pos]
+ if c.is_valid_hexdigit then dlength += 1
+ pos += 1
+ end
+
+ # Allocate the result buffer
+ var ret = new Bytes.with_capacity((dlength+1) / 2)
+
+ var i = (dlength+1) % 2 # current hex digit (1=high, 0=low)
+ var byte = 0 # current accumulated byte value
+
+ pos = 0
+ while pos < max do
+ var c = b[pos]
+ if c.is_valid_hexdigit then
+ byte = byte << 4 | c.hexdigit_to_byteval
+ i -= 1
+ if i < 0 then
+ # Last digit known: store and restart
+ ret.add byte
+ i = 1
+ byte = 0
+ end
+ end
+ pos += 1
end
return ret
end
#
# assert "<STRING/&rt;".hexdigest == "266C743B535452494E47262334373B2672743B"
fun hexdigest: String do
- var ln = bytelen
- var outns = new NativeString(ln * 2)
+ var ln = byte_length
+ var outns = new CString(ln * 2)
var oi = 0
for i in [0 .. ln[ do
bytes[i].add_digest_at(outns, oi)
oi += 2
end
- return new FlatString.with_infos(outns, ln * 2, 0, ln * 2 - 1)
+ return new FlatString.with_infos(outns, ln * 2, 0)
+ end
+
+ # Return a `Bytes` instance where Nit escape sequences are transformed.
+ #
+ # assert "B\\n\\x41\\u0103D3".unescape_to_bytes.hexdigest == "420A41F0908F93"
+ #
+ # `Bytes::chexdigest` is a loosely reverse methods since its result is only made
+ # of `"\x??"` escape sequences.
+ #
+ # assert "\\x41\\x42\\x43".unescape_to_bytes.chexdigest == "\\x41\\x42\\x43"
+ # assert "B\\n\\x41\\u0103D3".unescape_to_bytes.chexdigest == "\\x42\\x0A\\x41\\xF0\\x90\\x8F\\x93"
+ fun unescape_to_bytes: Bytes do
+ var res = new Bytes.with_capacity(self.byte_length)
+ var was_slash = false
+ var i = 0
+ while i < length do
+ var c = self[i]
+ if not was_slash then
+ if c == '\\' then
+ was_slash = true
+ else
+ res.add_char(c)
+ end
+ i += 1
+ continue
+ end
+ was_slash = false
+ if c == 'n' then
+ res.add_char('\n')
+ else if c == 'r' then
+ res.add_char('\r')
+ else if c == 't' then
+ res.add_char('\t')
+ else if c == '0' then
+ res.add_char('\0')
+ else if c == 'x' or c == 'X' then
+ var hx = substring(i + 1, 2)
+ if hx.is_hex then
+ res.add hx.to_hex
+ else
+ res.add_char(c)
+ end
+ i += 2
+ else if c == 'u' or c == 'U' then
+ var hx = substring(i + 1, 6)
+ if hx.is_hex then
+ res.add_char(hx.to_hex.code_point)
+ else
+ res.add_char(c)
+ end
+ i += 6
+ else
+ res.add_char(c)
+ end
+ i += 1
+ end
+ return res
+ end
+
+ # Return a `Bytes` by reading 0 and 1.
+ #
+ # assert "1010101100001101".binarydigest_to_bytes.hexdigest == "AB0D"
+ #
+ # Note that characters that are neither 0 or 1 are just ignored.
+ #
+ # assert "a1B01 010\n1100あ001101".binarydigest_to_bytes.hexdigest == "AB0D"
+ # assert "hello".binarydigest_to_bytes.is_empty
+ #
+ # When the number of bits is not divisible by 8, then leading 0 are
+ # implicitly considered to fill the left byte (the most significant one).
+ #
+ # assert "1".binarydigest_to_bytes.hexdigest == "01"
+ # assert "1111111".binarydigest_to_bytes.hexdigest == "7F"
+ # assert "1000110100".binarydigest_to_bytes.hexdigest == "0234"
+ #
+ # `Bytes::binarydigest` is a loosely reverse method since its
+ # results contain only 1 and 0 by blocks of 8.
+ #
+ # assert "1010101100001101".binarydigest_to_bytes.binarydigest == "1010101100001101"
+ # assert "1".binarydigest_to_bytes.binarydigest == "00000001"
+ fun binarydigest_to_bytes: Bytes
+ do
+ var b = bytes
+ var max = byte_length
+
+ # Count bits
+ var bitlen = 0
+ var pos = 0
+ while pos < max do
+ var c = b[pos]
+ pos += 1
+ if c == u'0' or c == u'1' then bitlen += 1
+ end
+
+ # Allocate (and take care of the padding)
+ var ret = new Bytes.with_capacity((bitlen+7) / 8)
+
+ var i = (bitlen+7) % 8 # current bit (7th=128, 0th=1)
+ var byte = 0 # current accumulated byte value
+
+ pos = 0
+ while pos < max do
+ var c = b[pos]
+ pos += 1
+ if c == u'0' then
+ byte = byte << 1
+ else if c == u'1' then
+ byte = byte << 1 | 1
+ else
+ continue
+ end
+
+ i -= 1
+ if i < 0 then
+ # Last bit known: store and restart
+ ret.add byte
+ i = 7
+ byte = 0
+ end
+ end
+ return ret
end
end
redef class FlatText
redef fun append_to_bytes(b) do
var from = if self isa FlatString then first_byte else 0
- b.append_ns_from(items, bytelen, from)
+ if isset _items then b.append_ns_from(items, byte_length, from)
end
end
-redef class NativeString
- # Creates a new `Bytes` object from `self` with `strlen` as length
- fun to_bytes: Bytes do
- var len = cstring_length
+redef class CString
+ # Creates a new `Bytes` object from `self` with `len` as length
+ #
+ # If `len` is null, strlen will determine the length of the Bytes
+ fun to_bytes(len: nullable Int): Bytes do
+ if len == null then len = cstring_length
return new Bytes(self, len, len)
end
+
+ # Creates a new `Bytes` object from a copy of `self` with `len` as length
+ #
+ # If `len` is null, strlen will determine the length of the Bytes
+ fun to_bytes_with_copy(len: nullable Int): Bytes do
+ if len == null then len = cstring_length
+ var nns = new CString(len)
+ copy_to(nns, len, 0, 0)
+ return new Bytes(nns, len, len)
+ end
end
# Joins an array of bytes `arr` separated by `sep`
#
-# assert join_bytes(["String".to_bytes, "is".to_bytes, "string".to_bytes], ' '.ascii).hexdigest == "537472696E6720697320737472696E67"
+# assert join_bytes(["String".to_bytes, "is".to_bytes, "string".to_bytes], u' ').hexdigest == "537472696E6720697320737472696E67"
fun join_bytes(arr: Array[Bytes], sep: nullable BytePattern): Bytes do
if arr.is_empty then return new Bytes.empty
sep = sep or else new Bytes.empty
nitlanguage / nit.git / blobdiff