id card generator

1 files changed, 827 insertions, 0 deletions

diff --git a/env/lib/python3.10/site-packages/PIL/JpegImagePlugin.py b/env/lib/python3.10/site-packages/PIL/JpegImagePlugin.py
new file mode 100644
index 0000000..a6ed223
--- /dev/null
+++ b/env/lib/python3.10/site-packages/PIL/JpegImagePlugin.py
@@ -0,0 +1,827 @@
+#
+# The Python Imaging Library.
+# $Id$
+#
+# JPEG (JFIF) file handling
+#
+# See "Digital Compression and Coding of Continuous-Tone Still Images,
+# Part 1, Requirements and Guidelines" (CCITT T.81 / ISO 10918-1)
+#
+# History:
+# 1995-09-09 fl   Created
+# 1995-09-13 fl   Added full parser
+# 1996-03-25 fl   Added hack to use the IJG command line utilities
+# 1996-05-05 fl   Workaround Photoshop 2.5 CMYK polarity bug
+# 1996-05-28 fl   Added draft support, JFIF version (0.1)
+# 1996-12-30 fl   Added encoder options, added progression property (0.2)
+# 1997-08-27 fl   Save mode 1 images as BW (0.3)
+# 1998-07-12 fl   Added YCbCr to draft and save methods (0.4)
+# 1998-10-19 fl   Don't hang on files using 16-bit DQT's (0.4.1)
+# 2001-04-16 fl   Extract DPI settings from JFIF files (0.4.2)
+# 2002-07-01 fl   Skip pad bytes before markers; identify Exif files (0.4.3)
+# 2003-04-25 fl   Added experimental EXIF decoder (0.5)
+# 2003-06-06 fl   Added experimental EXIF GPSinfo decoder
+# 2003-09-13 fl   Extract COM markers
+# 2009-09-06 fl   Added icc_profile support (from Florian Hoech)
+# 2009-03-06 fl   Changed CMYK handling; always use Adobe polarity (0.6)
+# 2009-03-08 fl   Added subsampling support (from Justin Huff).
+#
+# Copyright (c) 1997-2003 by Secret Labs AB.
+# Copyright (c) 1995-1996 by Fredrik Lundh.
+#
+# See the README file for information on usage and redistribution.
+#
+import array
+import io
+import math
+import os
+import struct
+import subprocess
+import sys
+import tempfile
+import warnings
+
+from . import Image, ImageFile, TiffImagePlugin
+from ._binary import i16be as i16
+from ._binary import i32be as i32
+from ._binary import o8
+from ._deprecate import deprecate
+from .JpegPresets import presets
+
+#
+# Parser
+
+
+def Skip(self, marker):
+    n = i16(self.fp.read(2)) - 2
+    ImageFile._safe_read(self.fp, n)
+
+
+def APP(self, marker):
+    #
+    # Application marker.  Store these in the APP dictionary.
+    # Also look for well-known application markers.
+
+    n = i16(self.fp.read(2)) - 2
+    s = ImageFile._safe_read(self.fp, n)
+
+    app = "APP%d" % (marker & 15)
+
+    self.app[app] = s  # compatibility
+    self.applist.append((app, s))
+
+    if marker == 0xFFE0 and s[:4] == b"JFIF":
+        # extract JFIF information
+        self.info["jfif"] = version = i16(s, 5)  # version
+        self.info["jfif_version"] = divmod(version, 256)
+        # extract JFIF properties
+        try:
+            jfif_unit = s[7]
+            jfif_density = i16(s, 8), i16(s, 10)
+        except Exception:
+            pass
+        else:
+            if jfif_unit == 1:
+                self.info["dpi"] = jfif_density
+            self.info["jfif_unit"] = jfif_unit
+            self.info["jfif_density"] = jfif_density
+    elif marker == 0xFFE1 and s[:5] == b"Exif\0":
+        if "exif" not in self.info:
+            # extract EXIF information (incomplete)
+            self.info["exif"] = s  # FIXME: value will change
+    elif marker == 0xFFE2 and s[:5] == b"FPXR\0":
+        # extract FlashPix information (incomplete)
+        self.info["flashpix"] = s  # FIXME: value will change
+    elif marker == 0xFFE2 and s[:12] == b"ICC_PROFILE\0":
+        # Since an ICC profile can be larger than the maximum size of
+        # a JPEG marker (64K), we need provisions to split it into
+        # multiple markers. The format defined by the ICC specifies
+        # one or more APP2 markers containing the following data:
+        #   Identifying string      ASCII "ICC_PROFILE\0"  (12 bytes)
+        #   Marker sequence number  1, 2, etc (1 byte)
+        #   Number of markers       Total of APP2's used (1 byte)
+        #   Profile data            (remainder of APP2 data)
+        # Decoders should use the marker sequence numbers to
+        # reassemble the profile, rather than assuming that the APP2
+        # markers appear in the correct sequence.
+        self.icclist.append(s)
+    elif marker == 0xFFED and s[:14] == b"Photoshop 3.0\x00":
+        # parse the image resource block
+        offset = 14
+        photoshop = self.info.setdefault("photoshop", {})
+        while s[offset : offset + 4] == b"8BIM":
+            try:
+                offset += 4
+                # resource code
+                code = i16(s, offset)
+                offset += 2
+                # resource name (usually empty)
+                name_len = s[offset]
+                # name = s[offset+1:offset+1+name_len]
+                offset += 1 + name_len
+                offset += offset & 1  # align
+                # resource data block
+                size = i32(s, offset)
+                offset += 4
+                data = s[offset : offset + size]
+                if code == 0x03ED:  # ResolutionInfo
+                    data = {
+                        "XResolution": i32(data, 0) / 65536,
+                        "DisplayedUnitsX": i16(data, 4),
+                        "YResolution": i32(data, 8) / 65536,
+                        "DisplayedUnitsY": i16(data, 12),
+                    }
+                photoshop[code] = data
+                offset += size
+                offset += offset & 1  # align
+            except struct.error:
+                break  # insufficient data
+
+    elif marker == 0xFFEE and s[:5] == b"Adobe":
+        self.info["adobe"] = i16(s, 5)
+        # extract Adobe custom properties
+        try:
+            adobe_transform = s[11]
+        except IndexError:
+            pass
+        else:
+            self.info["adobe_transform"] = adobe_transform
+    elif marker == 0xFFE2 and s[:4] == b"MPF\0":
+        # extract MPO information
+        self.info["mp"] = s[4:]
+        # offset is current location minus buffer size
+        # plus constant header size
+        self.info["mpoffset"] = self.fp.tell() - n + 4
+
+    # If DPI isn't in JPEG header, fetch from EXIF
+    if "dpi" not in self.info and "exif" in self.info:
+        try:
+            exif = self.getexif()
+            resolution_unit = exif[0x0128]
+            x_resolution = exif[0x011A]
+            try:
+                dpi = float(x_resolution[0]) / x_resolution[1]
+            except TypeError:
+                dpi = x_resolution
+            if math.isnan(dpi):
+                raise ValueError
+            if resolution_unit == 3:  # cm
+                # 1 dpcm = 2.54 dpi
+                dpi *= 2.54
+            self.info["dpi"] = dpi, dpi
+        except (TypeError, KeyError, SyntaxError, ValueError, ZeroDivisionError):
+            # SyntaxError for invalid/unreadable EXIF
+            # KeyError for dpi not included
+            # ZeroDivisionError for invalid dpi rational value
+            # ValueError or TypeError for dpi being an invalid float
+            self.info["dpi"] = 72, 72
+
+
+def COM(self, marker):
+    #
+    # Comment marker.  Store these in the APP dictionary.
+    n = i16(self.fp.read(2)) - 2
+    s = ImageFile._safe_read(self.fp, n)
+
+    self.info["comment"] = s
+    self.app["COM"] = s  # compatibility
+    self.applist.append(("COM", s))
+
+
+def SOF(self, marker):
+    #
+    # Start of frame marker.  Defines the size and mode of the
+    # image.  JPEG is colour blind, so we use some simple
+    # heuristics to map the number of layers to an appropriate
+    # mode.  Note that this could be made a bit brighter, by
+    # looking for JFIF and Adobe APP markers.
+
+    n = i16(self.fp.read(2)) - 2
+    s = ImageFile._safe_read(self.fp, n)
+    self._size = i16(s, 3), i16(s, 1)
+
+    self.bits = s[0]
+    if self.bits != 8:
+        raise SyntaxError(f"cannot handle {self.bits}-bit layers")
+
+    self.layers = s[5]
+    if self.layers == 1:
+        self.mode = "L"
+    elif self.layers == 3:
+        self.mode = "RGB"
+    elif self.layers == 4:
+        self.mode = "CMYK"
+    else:
+        raise SyntaxError(f"cannot handle {self.layers}-layer images")
+
+    if marker in [0xFFC2, 0xFFC6, 0xFFCA, 0xFFCE]:
+        self.info["progressive"] = self.info["progression"] = 1
+
+    if self.icclist:
+        # fixup icc profile
+        self.icclist.sort()  # sort by sequence number
+        if self.icclist[0][13] == len(self.icclist):
+            profile = []
+            for p in self.icclist:
+                profile.append(p[14:])
+            icc_profile = b"".join(profile)
+        else:
+            icc_profile = None  # wrong number of fragments
+        self.info["icc_profile"] = icc_profile
+        self.icclist = []
+
+    for i in range(6, len(s), 3):
+        t = s[i : i + 3]
+        # 4-tuples: id, vsamp, hsamp, qtable
+        self.layer.append((t[0], t[1] // 16, t[1] & 15, t[2]))
+
+
+def DQT(self, marker):
+    #
+    # Define quantization table.  Note that there might be more
+    # than one table in each marker.
+
+    # FIXME: The quantization tables can be used to estimate the
+    # compression quality.
+
+    n = i16(self.fp.read(2)) - 2
+    s = ImageFile._safe_read(self.fp, n)
+    while len(s):
+        v = s[0]
+        precision = 1 if (v // 16 == 0) else 2  # in bytes
+        qt_length = 1 + precision * 64
+        if len(s) < qt_length:
+            raise SyntaxError("bad quantization table marker")
+        data = array.array("B" if precision == 1 else "H", s[1:qt_length])
+        if sys.byteorder == "little" and precision > 1:
+            data.byteswap()  # the values are always big-endian
+        self.quantization[v & 15] = [data[i] for i in zigzag_index]
+        s = s[qt_length:]
+
+
+#
+# JPEG marker table
+
+MARKER = {
+    0xFFC0: ("SOF0", "Baseline DCT", SOF),
+    0xFFC1: ("SOF1", "Extended Sequential DCT", SOF),
+    0xFFC2: ("SOF2", "Progressive DCT", SOF),
+    0xFFC3: ("SOF3", "Spatial lossless", SOF),
+    0xFFC4: ("DHT", "Define Huffman table", Skip),
+    0xFFC5: ("SOF5", "Differential sequential DCT", SOF),
+    0xFFC6: ("SOF6", "Differential progressive DCT", SOF),
+    0xFFC7: ("SOF7", "Differential spatial", SOF),
+    0xFFC8: ("JPG", "Extension", None),
+    0xFFC9: ("SOF9", "Extended sequential DCT (AC)", SOF),
+    0xFFCA: ("SOF10", "Progressive DCT (AC)", SOF),
+    0xFFCB: ("SOF11", "Spatial lossless DCT (AC)", SOF),
+    0xFFCC: ("DAC", "Define arithmetic coding conditioning", Skip),
+    0xFFCD: ("SOF13", "Differential sequential DCT (AC)", SOF),
+    0xFFCE: ("SOF14", "Differential progressive DCT (AC)", SOF),
+    0xFFCF: ("SOF15", "Differential spatial (AC)", SOF),
+    0xFFD0: ("RST0", "Restart 0", None),
+    0xFFD1: ("RST1", "Restart 1", None),
+    0xFFD2: ("RST2", "Restart 2", None),
+    0xFFD3: ("RST3", "Restart 3", None),
+    0xFFD4: ("RST4", "Restart 4", None),
+    0xFFD5: ("RST5", "Restart 5", None),
+    0xFFD6: ("RST6", "Restart 6", None),
+    0xFFD7: ("RST7", "Restart 7", None),
+    0xFFD8: ("SOI", "Start of image", None),
+    0xFFD9: ("EOI", "End of image", None),
+    0xFFDA: ("SOS", "Start of scan", Skip),
+    0xFFDB: ("DQT", "Define quantization table", DQT),
+    0xFFDC: ("DNL", "Define number of lines", Skip),
+    0xFFDD: ("DRI", "Define restart interval", Skip),
+    0xFFDE: ("DHP", "Define hierarchical progression", SOF),
+    0xFFDF: ("EXP", "Expand reference component", Skip),
+    0xFFE0: ("APP0", "Application segment 0", APP),
+    0xFFE1: ("APP1", "Application segment 1", APP),
+    0xFFE2: ("APP2", "Application segment 2", APP),
+    0xFFE3: ("APP3", "Application segment 3", APP),
+    0xFFE4: ("APP4", "Application segment 4", APP),
+    0xFFE5: ("APP5", "Application segment 5", APP),
+    0xFFE6: ("APP6", "Application segment 6", APP),
+    0xFFE7: ("APP7", "Application segment 7", APP),
+    0xFFE8: ("APP8", "Application segment 8", APP),
+    0xFFE9: ("APP9", "Application segment 9", APP),
+    0xFFEA: ("APP10", "Application segment 10", APP),
+    0xFFEB: ("APP11", "Application segment 11", APP),
+    0xFFEC: ("APP12", "Application segment 12", APP),
+    0xFFED: ("APP13", "Application segment 13", APP),
+    0xFFEE: ("APP14", "Application segment 14", APP),
+    0xFFEF: ("APP15", "Application segment 15", APP),
+    0xFFF0: ("JPG0", "Extension 0", None),
+    0xFFF1: ("JPG1", "Extension 1", None),
+    0xFFF2: ("JPG2", "Extension 2", None),
+    0xFFF3: ("JPG3", "Extension 3", None),
+    0xFFF4: ("JPG4", "Extension 4", None),
+    0xFFF5: ("JPG5", "Extension 5", None),
+    0xFFF6: ("JPG6", "Extension 6", None),
+    0xFFF7: ("JPG7", "Extension 7", None),
+    0xFFF8: ("JPG8", "Extension 8", None),
+    0xFFF9: ("JPG9", "Extension 9", None),
+    0xFFFA: ("JPG10", "Extension 10", None),
+    0xFFFB: ("JPG11", "Extension 11", None),
+    0xFFFC: ("JPG12", "Extension 12", None),
+    0xFFFD: ("JPG13", "Extension 13", None),
+    0xFFFE: ("COM", "Comment", COM),
+}
+
+
+def _accept(prefix):
+    # Magic number was taken from https://en.wikipedia.org/wiki/JPEG
+    return prefix[:3] == b"\xFF\xD8\xFF"
+
+
+##
+# Image plugin for JPEG and JFIF images.
+
+
+class JpegImageFile(ImageFile.ImageFile):
+
+    format = "JPEG"
+    format_description = "JPEG (ISO 10918)"
+
+    def _open(self):
+
+        s = self.fp.read(3)
+
+        if not _accept(s):
+            raise SyntaxError("not a JPEG file")
+        s = b"\xFF"
+
+        # Create attributes
+        self.bits = self.layers = 0
+
+        # JPEG specifics (internal)
+        self.layer = []
+        self.huffman_dc = {}
+        self.huffman_ac = {}
+        self.quantization = {}
+        self.app = {}  # compatibility
+        self.applist = []
+        self.icclist = []
+
+        while True:
+
+            i = s[0]
+            if i == 0xFF:
+                s = s + self.fp.read(1)
+                i = i16(s)
+            else:
+                # Skip non-0xFF junk
+                s = self.fp.read(1)
+                continue
+
+            if i in MARKER:
+                name, description, handler = MARKER[i]
+                if handler is not None:
+                    handler(self, i)
+                if i == 0xFFDA:  # start of scan
+                    rawmode = self.mode
+                    if self.mode == "CMYK":
+                        rawmode = "CMYK;I"  # assume adobe conventions
+                    self.tile = [("jpeg", (0, 0) + self.size, 0, (rawmode, ""))]
+                    # self.__offset = self.fp.tell()
+                    break
+                s = self.fp.read(1)
+            elif i == 0 or i == 0xFFFF:
+                # padded marker or junk; move on
+                s = b"\xff"
+            elif i == 0xFF00:  # Skip extraneous data (escaped 0xFF)
+                s = self.fp.read(1)
+            else:
+                raise SyntaxError("no marker found")
+
+    def load_read(self, read_bytes):
+        """
+        internal: read more image data
+        For premature EOF and LOAD_TRUNCATED_IMAGES adds EOI marker
+        so libjpeg can finish decoding
+        """
+        s = self.fp.read(read_bytes)
+
+        if not s and ImageFile.LOAD_TRUNCATED_IMAGES and not hasattr(self, "_ended"):
+            # Premature EOF.
+            # Pretend file is finished adding EOI marker
+            self._ended = True
+            return b"\xFF\xD9"
+
+        return s
+
+    def draft(self, mode, size):
+
+        if len(self.tile) != 1:
+            return
+
+        # Protect from second call
+        if self.decoderconfig:
+            return
+
+        d, e, o, a = self.tile[0]
+        scale = 1
+        original_size = self.size
+
+        if a[0] == "RGB" and mode in ["L", "YCbCr"]:
+            self.mode = mode
+            a = mode, ""
+
+        if size:
+            scale = min(self.size[0] // size[0], self.size[1] // size[1])
+            for s in [8, 4, 2, 1]:
+                if scale >= s:
+                    break
+            e = (
+                e[0],
+                e[1],
+                (e[2] - e[0] + s - 1) // s + e[0],
+                (e[3] - e[1] + s - 1) // s + e[1],
+            )
+            self._size = ((self.size[0] + s - 1) // s, (self.size[1] + s - 1) // s)
+            scale = s
+
+        self.tile = [(d, e, o, a)]
+        self.decoderconfig = (scale, 0)
+
+        box = (0, 0, original_size[0] / scale, original_size[1] / scale)
+        return self.mode, box
+
+    def load_djpeg(self):
+
+        # ALTERNATIVE: handle JPEGs via the IJG command line utilities
+
+        f, path = tempfile.mkstemp()
+        os.close(f)
+        if os.path.exists(self.filename):
+            subprocess.check_call(["djpeg", "-outfile", path, self.filename])
+        else:
+            raise ValueError("Invalid Filename")
+
+        try:
+            with Image.open(path) as _im:
+                _im.load()
+                self.im = _im.im
+        finally:
+            try:
+                os.unlink(path)
+            except OSError:
+                pass
+
+        self.mode = self.im.mode
+        self._size = self.im.size
+
+        self.tile = []
+
+    def _getexif(self):
+        return _getexif(self)
+
+    def _getmp(self):
+        return _getmp(self)
+
+    def getxmp(self):
+        """
+        Returns a dictionary containing the XMP tags.
+        Requires defusedxml to be installed.
+
+        :returns: XMP tags in a dictionary.
+        """
+
+        for segment, content in self.applist:
+            if segment == "APP1":
+                marker, xmp_tags = content.rsplit(b"\x00", 1)
+                if marker == b"http://ns.adobe.com/xap/1.0/":
+                    return self._getxmp(xmp_tags)
+        return {}
+
+
+def _getexif(self):
+    if "exif" not in self.info:
+        return None
+    return self.getexif()._get_merged_dict()
+
+
+def _getmp(self):
+    # Extract MP information.  This method was inspired by the "highly
+    # experimental" _getexif version that's been in use for years now,
+    # itself based on the ImageFileDirectory class in the TIFF plugin.
+
+    # The MP record essentially consists of a TIFF file embedded in a JPEG
+    # application marker.
+    try:
+        data = self.info["mp"]
+    except KeyError:
+        return None
+    file_contents = io.BytesIO(data)
+    head = file_contents.read(8)
+    endianness = ">" if head[:4] == b"\x4d\x4d\x00\x2a" else "<"
+    # process dictionary
+    try:
+        info = TiffImagePlugin.ImageFileDirectory_v2(head)
+        file_contents.seek(info.next)
+        info.load(file_contents)
+        mp = dict(info)
+    except Exception as e:
+        raise SyntaxError("malformed MP Index (unreadable directory)") from e
+    # it's an error not to have a number of images
+    try:
+        quant = mp[0xB001]
+    except KeyError as e:
+        raise SyntaxError("malformed MP Index (no number of images)") from e
+    # get MP entries
+    mpentries = []
+    try:
+        rawmpentries = mp[0xB002]
+        for entrynum in range(0, quant):
+            unpackedentry = struct.unpack_from(
+                f"{endianness}LLLHH", rawmpentries, entrynum * 16
+            )
+            labels = ("Attribute", "Size", "DataOffset", "EntryNo1", "EntryNo2")
+            mpentry = dict(zip(labels, unpackedentry))
+            mpentryattr = {
+                "DependentParentImageFlag": bool(mpentry["Attribute"] & (1 << 31)),
+                "DependentChildImageFlag": bool(mpentry["Attribute"] & (1 << 30)),
+                "RepresentativeImageFlag": bool(mpentry["Attribute"] & (1 << 29)),
+                "Reserved": (mpentry["Attribute"] & (3 << 27)) >> 27,
+                "ImageDataFormat": (mpentry["Attribute"] & (7 << 24)) >> 24,
+                "MPType": mpentry["Attribute"] & 0x00FFFFFF,
+            }
+            if mpentryattr["ImageDataFormat"] == 0:
+                mpentryattr["ImageDataFormat"] = "JPEG"
+            else:
+                raise SyntaxError("unsupported picture format in MPO")
+            mptypemap = {
+                0x000000: "Undefined",
+                0x010001: "Large Thumbnail (VGA Equivalent)",
+                0x010002: "Large Thumbnail (Full HD Equivalent)",
+                0x020001: "Multi-Frame Image (Panorama)",
+                0x020002: "Multi-Frame Image: (Disparity)",
+                0x020003: "Multi-Frame Image: (Multi-Angle)",
+                0x030000: "Baseline MP Primary Image",
+            }
+            mpentryattr["MPType"] = mptypemap.get(mpentryattr["MPType"], "Unknown")
+            mpentry["Attribute"] = mpentryattr
+            mpentries.append(mpentry)
+        mp[0xB002] = mpentries
+    except KeyError as e:
+        raise SyntaxError("malformed MP Index (bad MP Entry)") from e
+    # Next we should try and parse the individual image unique ID list;
+    # we don't because I've never seen this actually used in a real MPO
+    # file and so can't test it.
+    return mp
+
+
+# --------------------------------------------------------------------
+# stuff to save JPEG files
+
+RAWMODE = {
+    "1": "L",
+    "L": "L",
+    "RGB": "RGB",
+    "RGBX": "RGB",
+    "CMYK": "CMYK;I",  # assume adobe conventions
+    "YCbCr": "YCbCr",
+}
+
+# fmt: off
+zigzag_index = (
+    0,  1,  5,  6, 14, 15, 27, 28,
+    2,  4,  7, 13, 16, 26, 29, 42,
+    3,  8, 12, 17, 25, 30, 41, 43,
+    9, 11, 18, 24, 31, 40, 44, 53,
+    10, 19, 23, 32, 39, 45, 52, 54,
+    20, 22, 33, 38, 46, 51, 55, 60,
+    21, 34, 37, 47, 50, 56, 59, 61,
+    35, 36, 48, 49, 57, 58, 62, 63,
+)
+
+samplings = {
+    (1, 1, 1, 1, 1, 1): 0,
+    (2, 1, 1, 1, 1, 1): 1,
+    (2, 2, 1, 1, 1, 1): 2,
+}
+# fmt: on
+
+
+def convert_dict_qtables(qtables):
+    deprecate("convert_dict_qtables", 10, action="Conversion is no longer needed")
+    return qtables
+
+
+def get_sampling(im):
+    # There's no subsampling when images have only 1 layer
+    # (grayscale images) or when they are CMYK (4 layers),
+    # so set subsampling to the default value.
+    #
+    # NOTE: currently Pillow can't encode JPEG to YCCK format.
+    # If YCCK support is added in the future, subsampling code will have
+    # to be updated (here and in JpegEncode.c) to deal with 4 layers.
+    if not hasattr(im, "layers") or im.layers in (1, 4):
+        return -1
+    sampling = im.layer[0][1:3] + im.layer[1][1:3] + im.layer[2][1:3]
+    return samplings.get(sampling, -1)
+
+
+def _save(im, fp, filename):
+    if im.width == 0 or im.height == 0:
+        raise ValueError("cannot write empty image as JPEG")
+
+    try:
+        rawmode = RAWMODE[im.mode]
+    except KeyError as e:
+        raise OSError(f"cannot write mode {im.mode} as JPEG") from e
+
+    info = im.encoderinfo
+
+    dpi = [round(x) for x in info.get("dpi", (0, 0))]
+
+    quality = info.get("quality", -1)
+    subsampling = info.get("subsampling", -1)
+    qtables = info.get("qtables")
+
+    if quality == "keep":
+        quality = -1
+        subsampling = "keep"
+        qtables = "keep"
+    elif quality in presets:
+        preset = presets[quality]
+        quality = -1
+        subsampling = preset.get("subsampling", -1)
+        qtables = preset.get("quantization")
+    elif not isinstance(quality, int):
+        raise ValueError("Invalid quality setting")
+    else:
+        if subsampling in presets:
+            subsampling = presets[subsampling].get("subsampling", -1)
+        if isinstance(qtables, str) and qtables in presets:
+            qtables = presets[qtables].get("quantization")
+
+    if subsampling == "4:4:4":
+        subsampling = 0
+    elif subsampling == "4:2:2":
+        subsampling = 1
+    elif subsampling == "4:2:0":
+        subsampling = 2
+    elif subsampling == "4:1:1":
+        # For compatibility. Before Pillow 4.3, 4:1:1 actually meant 4:2:0.
+        # Set 4:2:0 if someone is still using that value.
+        subsampling = 2
+    elif subsampling == "keep":
+        if im.format != "JPEG":
+            raise ValueError("Cannot use 'keep' when original image is not a JPEG")
+        subsampling = get_sampling(im)
+
+    def validate_qtables(qtables):
+        if qtables is None:
+            return qtables
+        if isinstance(qtables, str):
+            try:
+                lines = [
+                    int(num)
+                    for line in qtables.splitlines()
+                    for num in line.split("#", 1)[0].split()
+                ]
+            except ValueError as e:
+                raise ValueError("Invalid quantization table") from e
+            else:
+                qtables = [lines[s : s + 64] for s in range(0, len(lines), 64)]
+        if isinstance(qtables, (tuple, list, dict)):
+            if isinstance(qtables, dict):
+                qtables = [
+                    qtables[key] for key in range(len(qtables)) if key in qtables
+                ]
+            elif isinstance(qtables, tuple):
+                qtables = list(qtables)
+            if not (0 < len(qtables) < 5):
+                raise ValueError("None or too many quantization tables")
+            for idx, table in enumerate(qtables):
+                try:
+                    if len(table) != 64:
+                        raise TypeError
+                    table = array.array("H", table)
+                except TypeError as e:
+                    raise ValueError("Invalid quantization table") from e
+                else:
+                    qtables[idx] = list(table)
+            return qtables
+
+    if qtables == "keep":
+        if im.format != "JPEG":
+            raise ValueError("Cannot use 'keep' when original image is not a JPEG")
+        qtables = getattr(im, "quantization", None)
+    qtables = validate_qtables(qtables)
+
+    extra = info.get("extra", b"")
+
+    icc_profile = info.get("icc_profile")
+    if icc_profile:
+        ICC_OVERHEAD_LEN = 14
+        MAX_BYTES_IN_MARKER = 65533
+        MAX_DATA_BYTES_IN_MARKER = MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN
+        markers = []
+        while icc_profile:
+            markers.append(icc_profile[:MAX_DATA_BYTES_IN_MARKER])
+            icc_profile = icc_profile[MAX_DATA_BYTES_IN_MARKER:]
+        i = 1
+        for marker in markers:
+            size = struct.pack(">H", 2 + ICC_OVERHEAD_LEN + len(marker))
+            extra += (
+                b"\xFF\xE2"
+                + size
+                + b"ICC_PROFILE\0"
+                + o8(i)
+                + o8(len(markers))
+                + marker
+            )
+            i += 1
+
+    # "progressive" is the official name, but older documentation
+    # says "progression"
+    # FIXME: issue a warning if the wrong form is used (post-1.1.7)
+    progressive = info.get("progressive", False) or info.get("progression", False)
+
+    optimize = info.get("optimize", False)
+
+    exif = info.get("exif", b"")
+    if isinstance(exif, Image.Exif):
+        exif = exif.tobytes()
+
+    # get keyword arguments
+    im.encoderconfig = (
+        quality,
+        progressive,
+        info.get("smooth", 0),
+        optimize,
+        info.get("streamtype", 0),
+        dpi[0],
+        dpi[1],
+        subsampling,
+        qtables,
+        extra,
+        exif,
+    )
+
+    # if we optimize, libjpeg needs a buffer big enough to hold the whole image
+    # in a shot. Guessing on the size, at im.size bytes. (raw pixel size is
+    # channels*size, this is a value that's been used in a django patch.
+    # https://github.com/matthewwithanm/django-imagekit/issues/50
+    bufsize = 0
+    if optimize or progressive:
+        # CMYK can be bigger
+        if im.mode == "CMYK":
+            bufsize = 4 * im.size[0] * im.size[1]
+        # keep sets quality to -1, but the actual value may be high.
+        elif quality >= 95 or quality == -1:
+            bufsize = 2 * im.size[0] * im.size[1]
+        else:
+            bufsize = im.size[0] * im.size[1]
+
+    # The EXIF info needs to be written as one block, + APP1, + one spare byte.
+    # Ensure that our buffer is big enough. Same with the icc_profile block.
+    bufsize = max(ImageFile.MAXBLOCK, bufsize, len(exif) + 5, len(extra) + 1)
+
+    ImageFile._save(im, fp, [("jpeg", (0, 0) + im.size, 0, rawmode)], bufsize)
+
+
+def _save_cjpeg(im, fp, filename):
+    # ALTERNATIVE: handle JPEGs via the IJG command line utilities.
+    tempfile = im._dump()
+    subprocess.check_call(["cjpeg", "-outfile", filename, tempfile])
+    try:
+        os.unlink(tempfile)
+    except OSError:
+        pass
+
+
+##
+# Factory for making JPEG and MPO instances
+def jpeg_factory(fp=None, filename=None):
+    im = JpegImageFile(fp, filename)
+    try:
+        mpheader = im._getmp()
+        if mpheader[45057] > 1:
+            # It's actually an MPO
+            from .MpoImagePlugin import MpoImageFile
+
+            # Don't reload everything, just convert it.
+            im = MpoImageFile.adopt(im, mpheader)
+    except (TypeError, IndexError):
+        # It is really a JPEG
+        pass
+    except SyntaxError:
+        warnings.warn(
+            "Image appears to be a malformed MPO file, it will be "
+            "interpreted as a base JPEG file"
+        )
+    return im
+
+
+# ---------------------------------------------------------------------
+# Registry stuff
+
+Image.register_open(JpegImageFile.format, jpeg_factory, _accept)
+Image.register_save(JpegImageFile.format, _save)
+
+Image.register_extensions(JpegImageFile.format, [".jfif", ".jpe", ".jpg", ".jpeg"])
+
+Image.register_mime(JpegImageFile.format, "image/jpeg")