Use qstrs to improve compression
any qstr of >= 3 chars long is a candidate for use; the input byte value (1) is used to indicate a fixed-length qstr number follows. Before accounting for the code size changes, this saves ~100 bytes on trinket m0, but it may end up being a wash due to added code. A cutoff of length>2 is slightly better for ja and ru and worse for others. This has to do with the relative frequency of latin characters vs non-latin characters, is my guess. lang after before change (- = more free space) en_US 3132 2996 -134 fr 2136 2060 -76 ja 1916 1724 -232 ru 2196 2000 -196
This commit is contained in:
Jeff Epler
parent
e08ad22ef6
commit
4d8b354c13
@ -1,7 +1,9 @@
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"""
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Process raw qstr file and output qstr data with length, hash and data bytes.
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This script works with Python 2.7, 3.3 and 3.4.
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This script is only regularly tested with the same version of Python used
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during CI, typically the latest "3.x". However, incompatibilities with any
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supported CPython version are unintended.
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For documentation about the format of compressed translated strings, see
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supervisor/shared/translate/translate.h
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@ -16,31 +18,16 @@ import sys
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import collections
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import gettext
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import os.path
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import pathlib
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if hasattr(sys.stdout, "reconfigure"):
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sys.stdout.reconfigure(encoding="utf-8")
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sys.stderr.reconfigure(errors="backslashreplace")
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py = os.path.dirname(sys.argv[0])
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top = os.path.dirname(py)
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sys.path.append(os.path.join(top, "tools/huffman"))
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sys.path.append(str(pathlib.Path(__file__).parent.parent / "tools/huffman"))
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import huffman
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# Python 2/3 compatibility:
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# - iterating through bytes is different
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# - codepoint2name lives in a different module
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import platform
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if platform.python_version_tuple()[0] == "2":
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bytes_cons = lambda val, enc=None: bytearray(val)
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from htmlentitydefs import codepoint2name
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elif platform.python_version_tuple()[0] == "3":
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bytes_cons = bytes
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from html.entities import codepoint2name
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# end compatibility code
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codepoint2name[ord("-")] = "hyphen"
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@ -182,9 +169,15 @@ class EncodingTable:
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extractor: object
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apply_offset: object
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remove_offset: object
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translation_qstr_bits: int
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qstrs: object
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qstrs_inv: object
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def compute_huffman_coding(translation_name, translations, f):
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def compute_huffman_coding(qstrs, translation_name, translations, f):
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# possible future improvement: some languages are better when consider len(k) > 2. try both?
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qstrs = dict((k, v) for k, v in qstrs.items() if len(k) > 3)
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qstr_strs = list(qstrs.keys())
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texts = [t[1] for t in translations]
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words = []
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@ -234,10 +227,12 @@ def compute_huffman_coding(translation_name, translations, f):
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# if "the" is in words then not only will "the" not be considered
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# again, neither will "there" or "wither", since they have "the"
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# as substrings.
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extractor = TextSplitter(words)
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extractor = TextSplitter(words + qstr_strs)
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counter = collections.Counter()
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for t in texts:
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for atom in extractor.iter(t):
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if atom in qstrs:
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atom = "\1"
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counter[atom] += 1
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cb = huffman.codebook(counter.items())
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lengths = sorted(dict((v, len(cb[k])) for k, v in counter.items()).items())
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@ -304,10 +299,14 @@ def compute_huffman_coding(translation_name, translations, f):
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words.append(word)
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words.sort(key=len)
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extractor = TextSplitter(words)
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extractor = TextSplitter(words + qstr_strs)
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counter = collections.Counter()
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used_qstr = 0
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for t in texts:
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for atom in extractor.iter(t):
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if atom in qstrs:
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used_qstr = max(used_qstr, qstrs[atom])
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atom = "\1"
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counter[atom] += 1
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cb = huffman.codebook(counter.items())
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@ -322,6 +321,8 @@ def compute_huffman_coding(translation_name, translations, f):
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last_length = None
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canonical = {}
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for atom, code in sorted(cb.items(), key=lambda x: (len(x[1]), x[0])):
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if atom in qstr_strs:
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atom = "\1"
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values.append(atom)
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length = len(code)
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if length not in length_count:
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@ -359,6 +360,8 @@ def compute_huffman_coding(translation_name, translations, f):
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minlen = len(words[0])
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wlencount = [len([None for w in words if len(w) == l]) for l in range(minlen, maxlen + 1)]
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translation_qstr_bits = used_qstr.bit_length()
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f.write("typedef {} mchar_t;\n".format(values_type))
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f.write("const uint8_t lengths[] = {{ {} }};\n".format(", ".join(map(str, lengths))))
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f.write(
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@ -383,34 +386,44 @@ def compute_huffman_coding(translation_name, translations, f):
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f.write("#define maxlen {}\n".format(maxlen))
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f.write("#define translation_offstart {}\n".format(offstart))
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f.write("#define translation_offset {}\n".format(offset))
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f.write("#define translation_qstr_bits {}\n".format(translation_qstr_bits))
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return EncodingTable(values, lengths, words, canonical, extractor, apply_offset, remove_offset)
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qstrs_inv = dict((v, k) for k, v in qstrs.items())
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return EncodingTable(
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values,
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lengths,
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words,
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canonical,
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extractor,
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apply_offset,
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remove_offset,
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translation_qstr_bits,
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qstrs,
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qstrs_inv,
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)
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def decompress(encoding_table, encoded, encoded_length_bits):
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qstrs_inv = encoding_table.qstrs_inv
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values = encoding_table.values
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lengths = encoding_table.lengths
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words = encoding_table.words
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dec = []
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this_byte = 0
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this_bit = 7
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b = encoded[this_byte]
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bits = 0
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for i in range(encoded_length_bits):
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bits <<= 1
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if 0x80 & b:
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bits |= 1
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def bititer():
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for byte in encoded:
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for bit in (0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1):
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yield bool(byte & bit)
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b <<= 1
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if this_bit == 0:
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this_bit = 7
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this_byte += 1
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if this_byte < len(encoded):
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b = encoded[this_byte]
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else:
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this_bit -= 1
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length = bits
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nextbit = bititer().__next__
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def getnbits(n):
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bits = 0
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for i in range(n):
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bits = (bits << 1) | nextbit()
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return bits
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dec = []
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length = getnbits(encoded_length_bits)
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i = 0
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while i < length:
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@ -419,19 +432,8 @@ def decompress(encoding_table, encoded, encoded_length_bits):
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max_code = lengths[0]
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searched_length = lengths[0]
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while True:
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bits <<= 1
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if 0x80 & b:
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bits |= 1
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b <<= 1
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bits = (bits << 1) | nextbit()
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bit_length += 1
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if this_bit == 0:
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this_bit = 7
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this_byte += 1
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if this_byte < len(encoded):
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b = encoded[this_byte]
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else:
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this_bit -= 1
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if max_code > 0 and bits < max_code:
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# print('{0:0{width}b}'.format(bits, width=bit_length))
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break
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@ -439,7 +441,10 @@ def decompress(encoding_table, encoded, encoded_length_bits):
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searched_length += lengths[bit_length]
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v = values[searched_length + bits - max_code]
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if v >= chr(0x80) and v < chr(0x80 + len(words)):
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if v == chr(1):
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qstr_idx = getnbits(encoding_table.translation_qstr_bits)
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v = qstrs_inv[qstr_idx]
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elif v >= chr(0x80) and v < chr(0x80 + len(words)):
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v = words[ord(v) - 0x80]
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i += len(v.encode("utf-8"))
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dec.append(v)
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@ -449,36 +454,37 @@ def decompress(encoding_table, encoded, encoded_length_bits):
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def compress(encoding_table, decompressed, encoded_length_bits, len_translation_encoded):
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if not isinstance(decompressed, str):
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raise TypeError()
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qstrs = encoding_table.qstrs
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canonical = encoding_table.canonical
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extractor = encoding_table.extractor
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enc = bytearray(len(decompressed) * 3)
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current_bit = 7
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current_byte = 0
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enc = 1
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bits = encoded_length_bits + 1
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for i in range(bits - 1, 0, -1):
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if len_translation_encoded & (1 << (i - 1)):
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enc[current_byte] |= 1 << current_bit
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if current_bit == 0:
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current_bit = 7
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current_byte += 1
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else:
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current_bit -= 1
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def put_bit(enc, b):
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return (enc << 1) | bool(b)
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def put_bits(enc, b, n):
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for i in range(n - 1, -1, -1):
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enc = put_bit(enc, b & (1 << i))
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return enc
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enc = put_bits(enc, len_translation_encoded, encoded_length_bits)
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for atom in extractor.iter(decompressed):
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for b in canonical[atom]:
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if b == "1":
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enc[current_byte] |= 1 << current_bit
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if current_bit == 0:
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current_bit = 7
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current_byte += 1
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if atom in qstrs:
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can = canonical["\1"]
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else:
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current_bit -= 1
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can = canonical[atom]
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for b in can:
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enc = put_bit(enc, b == "1")
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if atom in qstrs:
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enc = put_bits(enc, qstrs[atom], encoding_table.translation_qstr_bits)
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if current_bit != 7:
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current_byte += 1
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return enc[:current_byte]
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while enc.bit_length() % 8 != 1:
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enc = put_bit(enc, 0)
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r = enc.to_bytes((enc.bit_length() + 7) // 8, "big")
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return r[1:]
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def qstr_escape(qst):
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@ -493,10 +499,20 @@ def qstr_escape(qst):
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return re.sub(r"[^A-Za-z0-9_]", esc_char, qst)
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def parse_qstrs(infile):
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r = {}
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rx = re.compile(r'QDEF\([A-Za-z0-9_]+,\s*\d+,\s*\d+,\s*(?P<cstr>"(?:[^"\\\\]*|\\.)")\)')
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content = infile.read()
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for i, mat in enumerate(rx.findall(content, re.M)):
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mat = eval(mat)
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r[mat] = i
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return r
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def parse_input_headers(infiles):
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i18ns = set()
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# read the qstrs in from the input files
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# read the TRANSLATE strings in from the input files
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for infile in infiles:
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with open(infile, "rt") as f:
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for line in f:
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@ -516,12 +532,12 @@ def escape_bytes(qstr):
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return qstr
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else:
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# qstr contains non-printable codes so render entire thing as hex pairs
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qbytes = bytes_cons(qstr, "utf8")
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qbytes = bytes(qstr, "utf8")
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return "".join(("\\x%02x" % b) for b in qbytes)
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def make_bytes(cfg_bytes_len, cfg_bytes_hash, qstr):
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qbytes = bytes_cons(qstr, "utf8")
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qbytes = bytes(qstr, "utf8")
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qlen = len(qbytes)
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qhash = compute_hash(qbytes, cfg_bytes_hash)
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if qlen >= (1 << (8 * cfg_bytes_len)):
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@ -551,7 +567,7 @@ def output_translation_data(encoding_table, i18ns, out):
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)
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total_text_compressed_size += len(compressed)
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decompressed = decompress(encoding_table, compressed, encoded_length_bits)
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assert decompressed == translation
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assert decompressed == translation, (decompressed, translation)
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for c in C_ESCAPES:
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decompressed = decompressed.replace(c, C_ESCAPES[c])
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formatted = ["{:d}".format(x) for x in compressed]
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@ -572,7 +588,7 @@ if __name__ == "__main__":
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import argparse
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parser = argparse.ArgumentParser(
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description="Process QSTR definitions into headers for compilation"
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description="Process TRANSLATE strings into headers for compilation"
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)
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parser.add_argument(
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"infiles", metavar="N", type=str, nargs="+", help="an integer for the accumulator"
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@ -590,13 +606,19 @@ if __name__ == "__main__":
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type=argparse.FileType("w", encoding="UTF-8"),
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help="c file for translation data",
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)
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parser.add_argument(
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"--qstrdefs_filename",
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type=argparse.FileType("r", encoding="UTF-8"),
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help="",
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)
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args = parser.parse_args()
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qstrs = parse_qstrs(args.qstrdefs_filename)
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i18ns = parse_input_headers(args.infiles)
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i18ns = sorted(i18ns)
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translations = translate(args.translation, i18ns)
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encoding_table = compute_huffman_coding(
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args.translation, translations, args.compression_filename
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qstrs, args.translation, translations, args.compression_filename
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)
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output_translation_data(encoding_table, translations, args.translation_filename)
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2
py/py.mk
2
py/py.mk
@ -270,7 +270,7 @@ $(PY_BUILD)/translations-$(TRANSLATION).c: $(HEADER_BUILD)/compressed_translatio
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$(HEADER_BUILD)/compressed_translations.generated.h: $(PY_SRC)/maketranslationdata.py $(HEADER_BUILD)/$(TRANSLATION).mo $(HEADER_BUILD)/qstrdefs.generated.h
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$(STEPECHO) "GEN $@"
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$(Q)mkdir -p $(PY_BUILD)
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$(Q)$(PYTHON) $(PY_SRC)/maketranslationdata.py --compression_filename $(HEADER_BUILD)/compressed_translations.generated.h --translation $(HEADER_BUILD)/$(TRANSLATION).mo --translation_filename $(PY_BUILD)/translations-$(TRANSLATION).c $(HEADER_BUILD)/qstrdefs.preprocessed.h
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$(Q)$(PYTHON) $(PY_SRC)/maketranslationdata.py --compression_filename $(HEADER_BUILD)/compressed_translations.generated.h --translation $(HEADER_BUILD)/$(TRANSLATION).mo --translation_filename $(PY_BUILD)/translations-$(TRANSLATION).c --qstrdefs_filename $(HEADER_BUILD)/qstrdefs.generated.h $(HEADER_BUILD)/qstrdefs.preprocessed.h
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PY_CORE_O += $(PY_BUILD)/translations-$(TRANSLATION).o
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@ -25,6 +25,7 @@
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*/
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#include "supervisor/shared/translate/translate.h"
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#include "py/qstr.h"
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#include <stdbool.h>
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#include <stdint.h>
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@ -99,10 +100,34 @@ uint16_t decompress_length(const compressed_string_t *compressed) {
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#endif
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}
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typedef struct {
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const uint8_t *ptr;
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uint8_t bit;
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} bitstream_state_t;
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static bool next_bit(bitstream_state_t *st) {
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bool r = *st->ptr & st->bit;
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st->bit >>= 1;
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if (!st->bit) {
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st->bit = 0x80;
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st->ptr++;
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}
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return r;
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}
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static int get_nbits(bitstream_state_t *st, int n) {
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int r = 0;
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while (n--) {
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r = (r << 1) | next_bit(st);
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}
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return r;
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}
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char *decompress(const compressed_string_t *compressed, char *decompressed) {
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uint8_t this_byte = compress_max_length_bits / 8;
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uint8_t this_bit = 7 - compress_max_length_bits % 8;
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uint8_t b = (&compressed->data)[this_byte] << (compress_max_length_bits % 8);
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bitstream_state_t b = {
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.ptr = &(compressed->data) + (compress_max_length_bits >> 3),
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.bit = 1 << (7 - ((compress_max_length_bits) & 0x7)),
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};
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uint16_t length = decompress_length(compressed);
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// Stop one early because the last byte is always NULL.
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@ -112,26 +137,23 @@ char *decompress(const compressed_string_t *compressed, char *decompressed) {
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uint32_t max_code = lengths[0];
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uint32_t searched_length = lengths[0];
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while (true) {
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bits <<= 1;
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if ((0x80 & b) != 0) {
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bits |= 1;
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}
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b <<= 1;
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bits = (bits << 1) | next_bit(&b);
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bit_length += 1;
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if (this_bit == 0) {
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this_bit = 7;
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this_byte += 1;
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b = (&compressed->data)[this_byte]; // This may read past the end but its never used.
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} else {
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this_bit -= 1;
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}
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if (max_code > 0 && bits < max_code) {
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break;
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}
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max_code = (max_code << 1) + lengths[bit_length];
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searched_length += lengths[bit_length];
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}
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i += put_utf8(decompressed + i, values[searched_length + bits - max_code]);
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int v = values[searched_length + bits - max_code];
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if (v == 1) {
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qstr q = get_nbits(&b, translation_qstr_bits) + 1; // honestly no idea why "+1"...
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for (const char *qc = qstr_str(q); *qc;) {
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decompressed[i++] = *qc++;
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}
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} else {
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i += put_utf8(decompressed + i, v);
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}
|
||||
}
|
||||
|
||||
decompressed[length - 1] = '\0';
|
||||
|
||||
Loading…
Reference in New Issue
Block a user