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(LZ4): use literal constants.

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This commit is contained in:
morkt 2017-04-02 10:01:51 +04:00
parent e604ed6607
commit 89de867c2d
1 changed files with 12 additions and 8 deletions
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20
ArcFormats/Lz4Stream.cs
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@ -187,8 +187,12 @@ namespace GameRes.Compression
// XXX checksum is ignored
}
const int LastLiterals = 5;
const int MFLimit = 12;
const int MinMatch = 4;
const int LastLiterals = 5;
const int MFLimit = 12;
const int MatchLengthBits = 4;
const int MatchLengthMask = 0xF;
const int RunMask = 0xF;
int DecompressBlock ()
{
@ -202,8 +206,8 @@ namespace GameRes.Compression
{
/* get literal length */
int token = m_block[src++];
int length = token >> 4;
if (0xF == length)
int length = token >> MatchLengthBits;
if (RunMask == length)
{
int n;
do
@ -211,7 +215,7 @@ namespace GameRes.Compression
n = m_block[src++];
length += n;
}
while ((src < iend - 0xF) && (0xFF == n));
while ((src < iend - RunMask) && (0xFF == n));
if (dst + length < dst || src + length < src) // overflow detection
throw InvalidData();
}
@ -239,8 +243,8 @@ namespace GameRes.Compression
throw InvalidData();
/* get matchlength */
length = token & 0xF;
if (0xF == length)
length = token & MatchLengthMask;
if (MatchLengthMask == length)
{
int n;
do
@ -254,7 +258,7 @@ namespace GameRes.Compression
if (dst + length < dst) // overflow detection
throw InvalidData();
}
length += 4;
length += MinMatch;
/* copy match within block */
Binary.CopyOverlapped (m_data, match, dst, length);