py3: port a bunch of places where individual byes are accessed from a bytestring

src/calibre/ebooks/compression/tcr.py

@@ -43,8 +43,8 @@ class TCRCompressor(object):
                 possible_codes.append(single_code.pop())
 
         for code in possible_codes:
-            self.coded_txt = self.coded_txt.replace(code, code[0])
-            self.codes[ord(code[0])] = b'%s%s' % (self.codes[ord(code[0])], self.codes[ord(code[1])])
+            self.coded_txt = self.coded_txt.replace(code, code[0:1])
+            self.codes[ord(code[0:1])] = b'%s%s' % (self.codes[ord(code[0:1])], self.codes[ord(code[1:2])])
 
     def _free_unused_codes(self):
         '''

src/calibre/ebooks/djvu/djvu.py

@@ -84,9 +84,9 @@ class DjvuChunk(object):
                 if not res.strip(b'\0'):
                     raise ValueError('TXTz block is completely null')
                 l = 0
-                for x in res[:3]:
+                for x in bytearray(res[:3]):
                     l <<= 8
-                    l += ord(x)
+                    l += x
                 if verbose > 0 and out:
                     print(l, file=out)
                 txtout.write(res[3:3+l])
@@ -94,9 +94,9 @@ class DjvuChunk(object):
         if txtout and self.type == b'TXTa':
             res = self.buf[self.datastart: self.dataend]
             l = 0
-            for x in res[:3]:
+            for x in bytearray(res[:3]):
                 l <<= 8
-                l += ord(x)
+                l += x
             if verbose > 0 and out:
                 print(l, file=out)
             txtout.write(res[3:3+l])

src/calibre/ebooks/lit/reader.py

@@ -871,7 +871,7 @@ class LitFile(object):
         for i in range(1, nentries + 1):
             if len(data) <= 1:
                 break
-            size, data = ord(data[0]), data[1:]
+            size, data = ord(data[0:1]), data[1:]
             if size == 0 or len(data) < size:
                 break
             tags[i], data = data[:size], data[size:]

src/calibre/ebooks/metadata/kfx.py

@@ -17,7 +17,7 @@ from calibre.utils.config_base import tweaks
 from calibre.utils.date import parse_only_date
 from calibre.utils.localization import canonicalize_lang
 from calibre.utils.imghdr import identify
-from polyglot.builtins import unicode_type, filter
+from polyglot.builtins import unicode_type, filter, map
 from polyglot.binary import as_base64_bytes, from_base64_bytes
 
 
@@ -62,7 +62,11 @@ COVER_KEY = "cover_image_base64"
 
 
 def hexs(string, sep=' '):
-    return sep.join('%02x' % ord(b) for b in string)
+    if isinstance(string, bytes):
+        string = bytearray(string)
+    else:
+        string = map(ord, string)
+    return sep.join('%02x' % b for b in string)
 
 
 class PackedData(object):

src/calibre/ebooks/metadata/topaz.py

@@ -277,9 +277,9 @@ class MetadataUpdater(object):
         offset += consumed
         self.md_header['tag'] = self.data[offset:offset+taglen]
         offset += taglen
-        self.md_header['flags'] = ord(self.data[offset])
+        self.md_header['flags'] = ord(self.data[offset:offset+1])
         offset += 1
-        self.md_header['num_recs'] = ord(self.data[offset])
+        self.md_header['num_recs'] = ord(self.data[offset:offset+1])
         offset += 1
         # print "self.md_header: %s" % self.md_header
 

src/calibre/ebooks/mobi/debug/mobi6.py

@@ -79,7 +79,7 @@ class SecondaryIndexHeader(object):  # {{{
             raise ValueError('TAGX last entry is not EOF')
 
         idxt0_pos = self.header_length+self.tagx_header_length
-        num = ord(raw[idxt0_pos])
+        num = ord(raw[idxt0_pos:idxt0_pos+1])
         count_pos = idxt0_pos+1+num
         self.last_entry = raw[idxt0_pos+1:count_pos]
         self.ncx_count, = struct.unpack(b'>H', raw[count_pos:count_pos+2])

src/calibre/ebooks/pdb/plucker/reader.py

@@ -496,11 +496,11 @@ class Reader(FormatReader):
                     html += u'<p>'
                 paragraph_open = True
 
-            c = ord(d[offset])
+            c = ord(d[offset:offset+1])
             # PHTML "functions"
             if c == 0x0:
                 offset += 1
-                c = ord(d[offset])
+                c = ord(d[offset:offset+1])
                 # Page link begins
                 # 2 Bytes
                 # record ID

src/calibre/gui2/store/search/models.py

@@ -333,7 +333,7 @@ class SearchFilter(SearchQueryParser):
 
     def __init__(self):
         SearchQueryParser.__init__(self, locations=self.USABLE_LOCATIONS)
-        self.srs = set([])
+        self.srs = set()
         # remove joiner words surrounded by space or at string boundaries
         self.joiner_pat = re.compile(r'(^|\s)(and|not|or|a|the|is|of)(\s|$)', re.IGNORECASE)
         self.punctuation_table = {ord(x):' ' for x in string.punctuation}

src/calibre/utils/__init__.py

@@ -41,7 +41,7 @@ def unpickle_binary_string(data):
             sz, = struct.unpack_from('<i', data, offset)
             offset += struct.calcsize('<i')
         elif which == SHORT_BINSTRING:
-            sz = ord(data[offset])
+            sz = ord(data[offset:offset+1])
             offset += 1
         else:
             return

src/calibre/utils/fonts/sfnt/cff/dict_data.py

@@ -36,11 +36,11 @@ class ByteCode(dict):
         return b0 - 139, index
 
     def read_small_int1(self, b0, data, index):
-        b1 = ord(data[index])
+        b1 = ord(data[index:index+1])
         return (b0-247)*256 + b1 + 108, index+1
 
     def read_small_int2(self, b0, data, index):
-        b1 = ord(data[index])
+        b1 = ord(data[index:index+1])
         return -(b0-251)*256 - b1 - 108, index+1
 
     def read_short_int(self, b0, data, index):
@@ -61,7 +61,7 @@ class ByteCode(dict):
     def read_real_number(self, b0, data, index):
         number = ''
         while True:
-            b = ord(data[index])
+            b = ord(data[index:index+1])
             index = index + 1
             nibble0 = (b & 0xf0) >> 4
             nibble1 = b & 0x0f
@@ -144,7 +144,7 @@ class Dict(ByteCode):
         self.stack = []
         index = 0
         while index < len(data):
-            b0 = ord(data[index])
+            b0 = ord(data[index:index+1])
             index += 1
             handler = getattr(self, self.operand_encoding[b0])
             value, index = handler(b0, data, index)
@@ -153,7 +153,7 @@ class Dict(ByteCode):
 
     def do_operator(self, b0, data, index):
         if b0 == 12:
-            op = (b0, ord(data[index]))
+            op = (b0, ord(data[index:index+1]))
             index += 1
         else:
             op = b0

src/css_selectors/parser.py

@@ -18,7 +18,7 @@ from css_selectors.errors import SelectorSyntaxError, ExpressionError
 from polyglot.builtins import unicode_type, codepoint_to_chr, range
 
 
-utab = {c:c+32 for c in range(ord('A'), ord('Z')+1)}
+utab = {c:c+32 for c in range(ord(u'A'), ord(u'Z')+1)}
 
 if sys.version_info.major < 3:
     tab = string.maketrans(string.ascii_uppercase, string.ascii_lowercase)