other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoderOpt.h@97036ab72558 (annotated)
other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoderOpt.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | // Compress/RangeCoder/RangeCoderOpt.h |
| michael@0 | 2 | |
| michael@0 | 3 | #ifndef __COMPRESS_RANGECODER_OPT_H |
| michael@0 | 4 | #define __COMPRESS_RANGECODER_OPT_H |
| michael@0 | 5 | |
| michael@0 | 6 | #define RC_INIT_VAR \ |
| michael@0 | 7 | UInt32 range = rangeDecoder->Range; \ |
| michael@0 | 8 | UInt32 code = rangeDecoder->Code; |
| michael@0 | 9 | |
| michael@0 | 10 | #define RC_FLUSH_VAR \ |
| michael@0 | 11 | rangeDecoder->Range = range; \ |
| michael@0 | 12 | rangeDecoder->Code = code; |
| michael@0 | 13 | |
| michael@0 | 14 | #define RC_NORMALIZE \ |
| michael@0 | 15 | if (range < NCompress::NRangeCoder::kTopValue) \ |
| michael@0 | 16 | { code = (code << 8) | rangeDecoder->Stream.ReadByte(); range <<= 8; } |
| michael@0 | 17 | |
| michael@0 | 18 | #define RC_GETBIT2(numMoveBits, prob, mi, A0, A1) \ |
| michael@0 | 19 | { UInt32 bound = (range >> NCompress::NRangeCoder::kNumBitModelTotalBits) * prob; \ |
| michael@0 | 20 | if (code < bound) \ |
| michael@0 | 21 | { A0; range = bound; \ |
| michael@0 | 22 | prob += (NCompress::NRangeCoder::kBitModelTotal - prob) >> numMoveBits; \ |
| michael@0 | 23 | mi <<= 1; } \ |
| michael@0 | 24 | else \ |
| michael@0 | 25 | { A1; range -= bound; code -= bound; prob -= (prob) >> numMoveBits; \ |
| michael@0 | 26 | mi = (mi + mi) + 1; }} \ |
| michael@0 | 27 | RC_NORMALIZE |
| michael@0 | 28 | |
| michael@0 | 29 | #define RC_GETBIT(numMoveBits, prob, mi) RC_GETBIT2(numMoveBits, prob, mi, ; , ;) |
| michael@0 | 30 | |
| michael@0 | 31 | #endif |
