X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/6ca714d55119e87a01bd475abd08e7212dcafbd0..34b491e735ad47c4805e63f3b83a659b8d10262b:/apt-pkg/contrib/mmap.h diff --git a/apt-pkg/contrib/mmap.h b/apt-pkg/contrib/mmap.h index 19cf7582d..c1dfedf6d 100644 --- a/apt-pkg/contrib/mmap.h +++ b/apt-pkg/contrib/mmap.h @@ -6,7 +6,7 @@ MMap Class - Provides 'real' mmap or a faked mmap using read(). The purpose of this code is to provide a generic way for clients to - access the mmap function. In enviroments that do not support mmap + access the mmap function. In environments that do not support mmap from file fd's this function will use read and normal allocated memory. @@ -15,7 +15,7 @@ The DynamicMMap class is used to help the on-disk data structure generators. It provides a large allocated workspace and members - to allocate space from the workspace in an effecient fashion. + to allocate space from the workspace in an efficient fashion. This source is placed in the Public Domain, do with it what you will It was originally written by Jason Gunthorpe. @@ -27,9 +27,13 @@ #include -#include +#ifndef APT_8_CLEANER_HEADERS +#include using std::string; +#endif + +class FileFd; /* This should be a 32 bit type, larger tyes use too much ram and smaller types are too small. Where ever possible 'unsigned long' should be used @@ -41,21 +45,28 @@ class MMap protected: unsigned long Flags; - unsigned long iSize; + unsigned long long iSize; void *Base; + // In case mmap can not be used, we keep a dup of the file + // descriptor that should have been mmaped so that we can write to + // the file in Sync(). + FileFd *SyncToFd; + bool Map(FileFd &Fd); bool Close(bool DoSync = true); public: enum OpenFlags {NoImmMap = (1<<0),Public = (1<<1),ReadOnly = (1<<2), - UnMapped = (1<<3)}; + UnMapped = (1<<3), Moveable = (1<<4), Fallback = (1 << 5)}; // Simple accessors inline operator void *() {return Base;}; inline void *Data() {return Base;}; - inline unsigned long Size() {return iSize;}; + inline unsigned long long Size() {return iSize;}; + inline void AddSize(unsigned long long const size) {iSize += size;}; + inline bool validData() const { return Base != (void *)-1 && Base != 0; }; // File manipulators bool Sync(); @@ -82,20 +93,26 @@ class DynamicMMap : public MMap FileFd *Fd; unsigned long WorkSpace; + unsigned long const GrowFactor; + unsigned long const Limit; Pool *Pools; unsigned int PoolCount; + + bool Grow(); public: // Allocation - unsigned long RawAllocate(unsigned long Size,unsigned long Aln = 0); + unsigned long RawAllocate(unsigned long long Size,unsigned long Aln = 0); unsigned long Allocate(unsigned long ItemSize); unsigned long WriteString(const char *String,unsigned long Len = (unsigned long)-1); - inline unsigned long WriteString(const string &S) {return WriteString(S.c_str(),S.length());}; + inline unsigned long WriteString(const std::string &S) {return WriteString(S.c_str(),S.length());}; void UsePools(Pool &P,unsigned int Count) {Pools = &P; PoolCount = Count;}; - DynamicMMap(FileFd &F,unsigned long Flags,unsigned long WorkSpace = 2*1024*1024); - DynamicMMap(unsigned long Flags,unsigned long WorkSpace = 2*1024*1024); + DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &WorkSpace = 2*1024*1024, + unsigned long const &Grow = 1024*1024, unsigned long const &Limit = 0); + DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace = 2*1024*1024, + unsigned long const &Grow = 1024*1024, unsigned long const &Limit = 0); virtual ~DynamicMMap(); };