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authorMichael Vogt <michael.vogt@ubuntu.com>2010-09-03 14:04:50 +0200
committerMichael Vogt <michael.vogt@ubuntu.com>2010-09-03 14:04:50 +0200
commit0205540433440a9ff4ad4ea4cce44c700a4b401c (patch)
tree97809e2e38482d3d7f124b30552a0936adf4d405 /apt-pkg/tagfile.h
parent24baab5c477bf1e57a0b169a7bac1d2e9ab0c974 (diff)
parent2c6baa5a1f935eb3b8d4eb9fdef62e696416e27a (diff)
merged from lp:~donkult/apt/sid
Diffstat (limited to 'apt-pkg/tagfile.h')
-rw-r--r--apt-pkg/tagfile.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index 321329a23..6891c1d81 100644
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -33,7 +33,18 @@ class pkgTagSection
unsigned int AlphaIndexes[0x100];
unsigned int TagCount;
-
+
+ /* This very simple hash function for the last 8 letters gives
+ very good performance on the debian package files */
+ inline static unsigned long AlphaHash(const char *Text, const char *End = 0)
+ {
+ unsigned long Res = 0;
+ for (; Text != End && *Text != ':' && *Text != 0; Text++)
+ Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1);
+ return Res & 0xFF;
+ }
+
+
protected:
const char *Stop;
@@ -46,6 +57,7 @@ class pkgTagSection
bool Find(const char *Tag,unsigned &Pos) const;
string FindS(const char *Tag) const;
signed int FindI(const char *Tag,signed long Default = 0) const ;
+ unsigned long long FindULL(const char *Tag, unsigned long long const &Default = 0) const;
bool FindFlag(const char *Tag,unsigned long &Flags,
unsigned long Flag) const;
bool Scan(const char *Start,unsigned long MaxLength);
@@ -54,6 +66,8 @@ class pkgTagSection
virtual void TrimRecord(bool BeforeRecord, const char* &End);
inline unsigned int Count() const {return TagCount;};
+ inline bool Exists(const char* const Tag) {return AlphaIndexes[AlphaHash(Tag)] != 0;}
+
inline void Get(const char *&Start,const char *&Stop,unsigned int I) const
{Start = Section + Indexes[I]; Stop = Section + Indexes[I+1];}