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Diffstat (limited to 'db/mork/src/morkAtom.cpp')
| -rw-r--r-- | db/mork/src/morkAtom.cpp | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/db/mork/src/morkAtom.cpp b/db/mork/src/morkAtom.cpp new file mode 100644 index 000000000..0b73f97fa --- /dev/null +++ b/db/mork/src/morkAtom.cpp @@ -0,0 +1,528 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef _MDB_ +#include "mdb.h" +#endif + +#ifndef _MORK_ +#include "mork.h" +#endif + +#ifndef _MORKBLOB_ +#include "morkBlob.h" +#endif + +#ifndef _MORKATOM_ +#include "morkAtom.h" +#endif + +#ifndef _MORKENV_ +#include "morkEnv.h" +#endif + +#ifndef _MORKATOMSPACE_ +#include "morkAtomSpace.h" +#endif + +//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789 + +mork_bool +morkAtom::GetYarn(mdbYarn* outYarn) const +{ + const void* source = 0; + mdb_fill fill = 0; + mdb_cscode form = 0; + outYarn->mYarn_More = 0; + + if ( this->IsWeeBook() ) + { + morkWeeBookAtom* weeBook = (morkWeeBookAtom*) this; + source = weeBook->mWeeBookAtom_Body; + fill = weeBook->mAtom_Size; + } + else if ( this->IsBigBook() ) + { + morkBigBookAtom* bigBook = (morkBigBookAtom*) this; + source = bigBook->mBigBookAtom_Body; + fill = bigBook->mBigBookAtom_Size; + form = bigBook->mBigBookAtom_Form; + } + else if ( this->IsWeeAnon() ) + { + morkWeeAnonAtom* weeAnon = (morkWeeAnonAtom*) this; + source = weeAnon->mWeeAnonAtom_Body; + fill = weeAnon->mAtom_Size; + } + else if ( this->IsBigAnon() ) + { + morkBigAnonAtom* bigAnon = (morkBigAnonAtom*) this; + source = bigAnon->mBigAnonAtom_Body; + fill = bigAnon->mBigAnonAtom_Size; + form = bigAnon->mBigAnonAtom_Form; + } + + if ( source && fill ) // have an atom with nonempty content? + { + // if we have too many bytes, and yarn seems growable: + if ( fill > outYarn->mYarn_Size && outYarn->mYarn_Grow ) // try grow? + (*outYarn->mYarn_Grow)(outYarn, (mdb_size) fill); // request bigger + + mdb_size size = outYarn->mYarn_Size; // max dest size + if ( fill > size ) // too much atom content? + { + outYarn->mYarn_More = fill - size; // extra atom bytes omitted + fill = size; // copy no more bytes than size of yarn buffer + } + void* dest = outYarn->mYarn_Buf; // where bytes are going + if ( !dest ) // nil destination address buffer? + fill = 0; // we can't write any content at all + + if ( fill ) // anything to copy? + MORK_MEMCPY(dest, source, fill); // copy fill bytes to yarn + + outYarn->mYarn_Fill = fill; // tell yarn size of copied content + } + else // no content to put into the yarn + { + outYarn->mYarn_Fill = 0; // tell yarn that atom has no bytes + } + outYarn->mYarn_Form = form; // always update the form slot + + return ( source != 0 ); +} + +/* static */ +mork_bool +morkAtom::AliasYarn(const morkAtom* atom, mdbYarn* outYarn) +{ + outYarn->mYarn_More = 0; + outYarn->mYarn_Form = 0; + + if ( atom ) + { + if ( atom->IsWeeBook() ) + { + morkWeeBookAtom* weeBook = (morkWeeBookAtom*) atom; + outYarn->mYarn_Buf = weeBook->mWeeBookAtom_Body; + outYarn->mYarn_Fill = weeBook->mAtom_Size; + outYarn->mYarn_Size = weeBook->mAtom_Size; + } + else if ( atom->IsBigBook() ) + { + morkBigBookAtom* bigBook = (morkBigBookAtom*) atom; + outYarn->mYarn_Buf = bigBook->mBigBookAtom_Body; + outYarn->mYarn_Fill = bigBook->mBigBookAtom_Size; + outYarn->mYarn_Size = bigBook->mBigBookAtom_Size; + outYarn->mYarn_Form = bigBook->mBigBookAtom_Form; + } + else if ( atom->IsWeeAnon() ) + { + morkWeeAnonAtom* weeAnon = (morkWeeAnonAtom*) atom; + outYarn->mYarn_Buf = weeAnon->mWeeAnonAtom_Body; + outYarn->mYarn_Fill = weeAnon->mAtom_Size; + outYarn->mYarn_Size = weeAnon->mAtom_Size; + } + else if ( atom->IsBigAnon() ) + { + morkBigAnonAtom* bigAnon = (morkBigAnonAtom*) atom; + outYarn->mYarn_Buf = bigAnon->mBigAnonAtom_Body; + outYarn->mYarn_Fill = bigAnon->mBigAnonAtom_Size; + outYarn->mYarn_Size = bigAnon->mBigAnonAtom_Size; + outYarn->mYarn_Form = bigAnon->mBigAnonAtom_Form; + } + else + atom = 0; // show desire to put empty content in yarn + } + + if ( !atom ) // empty content for yarn? + { + outYarn->mYarn_Buf = 0; + outYarn->mYarn_Fill = 0; + outYarn->mYarn_Size = 0; + // outYarn->mYarn_Grow = 0; // please don't modify the Grow slot + } + return ( atom != 0 ); +} + +mork_aid +morkAtom::GetBookAtomAid() const // zero or book atom's ID +{ + return ( this->IsBook() )? ((morkBookAtom*) this)->mBookAtom_Id : 0; +} + +mork_scope +morkAtom::GetBookAtomSpaceScope(morkEnv* ev) const // zero or book's space's scope +{ + mork_scope outScope = 0; + if ( this->IsBook() ) + { + const morkBookAtom* bookAtom = (const morkBookAtom*) this; + morkAtomSpace* space = bookAtom->mBookAtom_Space; + if ( space->IsAtomSpace() ) + outScope = space->SpaceScope(); + else + space->NonAtomSpaceTypeError(ev); + } + + return outScope; +} + +void +morkAtom::MakeCellUseForever(morkEnv* ev) +{ + MORK_USED_1(ev); + mAtom_CellUses = morkAtom_kForeverCellUses; +} + +mork_u1 +morkAtom::AddCellUse(morkEnv* ev) +{ + MORK_USED_1(ev); + if ( mAtom_CellUses < morkAtom_kMaxCellUses ) // not already maxed out? + ++mAtom_CellUses; + + return mAtom_CellUses; +} + +mork_u1 +morkAtom::CutCellUse(morkEnv* ev) +{ + if ( mAtom_CellUses ) // any outstanding uses to cut? + { + if ( mAtom_CellUses < morkAtom_kMaxCellUses ) // not frozen at max? + --mAtom_CellUses; + } + else + this->CellUsesUnderflowWarning(ev); + + return mAtom_CellUses; +} + +/*static*/ void +morkAtom::CellUsesUnderflowWarning(morkEnv* ev) +{ + ev->NewWarning("mAtom_CellUses underflow"); +} + +/*static*/ void +morkAtom::BadAtomKindError(morkEnv* ev) +{ + ev->NewError("bad mAtom_Kind"); +} + +/*static*/ void +morkAtom::ZeroAidError(morkEnv* ev) +{ + ev->NewError("zero atom ID"); +} + +/*static*/ void +morkAtom::AtomSizeOverflowError(morkEnv* ev) +{ + ev->NewError("atom mAtom_Size overflow"); +} + +void +morkOidAtom::InitRowOidAtom(morkEnv* ev, const mdbOid& inOid) +{ + MORK_USED_1(ev); + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindRowOid; + mAtom_Change = morkChange_kNil; + mAtom_Size = 0; + mOidAtom_Oid = inOid; // bitwise copy +} + +void +morkOidAtom::InitTableOidAtom(morkEnv* ev, const mdbOid& inOid) +{ + MORK_USED_1(ev); + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindTableOid; + mAtom_Change = morkChange_kNil; + mAtom_Size = 0; + mOidAtom_Oid = inOid; // bitwise copy +} + +void +morkWeeAnonAtom::InitWeeAnonAtom(morkEnv* ev, const morkBuf& inBuf) +{ + mAtom_Kind = 0; + mAtom_Change = morkChange_kNil; + if ( inBuf.mBuf_Fill <= morkAtom_kMaxByteSize ) + { + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindWeeAnon; + mork_size size = inBuf.mBuf_Fill; + mAtom_Size = (mork_u1) size; + if ( size && inBuf.mBuf_Body ) + MORK_MEMCPY(mWeeAnonAtom_Body, inBuf.mBuf_Body, size); + + mWeeAnonAtom_Body[ size ] = 0; + } + else + this->AtomSizeOverflowError(ev); +} + +void +morkBigAnonAtom::InitBigAnonAtom(morkEnv* ev, const morkBuf& inBuf, + mork_cscode inForm) +{ + MORK_USED_1(ev); + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindBigAnon; + mAtom_Change = morkChange_kNil; + mAtom_Size = 0; + mBigAnonAtom_Form = inForm; + mork_size size = inBuf.mBuf_Fill; + mBigAnonAtom_Size = size; + if ( size && inBuf.mBuf_Body ) + MORK_MEMCPY(mBigAnonAtom_Body, inBuf.mBuf_Body, size); + + mBigAnonAtom_Body[ size ] = 0; +} + +/*static*/ void +morkBookAtom::NonBookAtomTypeError(morkEnv* ev) +{ + ev->NewError("non morkBookAtom"); +} + +mork_u4 +morkBookAtom::HashFormAndBody(morkEnv* ev) const +{ + // This hash is obviously a variation of the dragon book string hash. + // (I won't bother to explain or rationalize this usage for you.) + + mork_u4 outHash = 0; // hash value returned + unsigned char c; // next character + const mork_u1* body; // body of bytes to hash + mork_size size = 0; // the number of bytes to hash + + if ( this->IsWeeBook() ) + { + size = mAtom_Size; + body = ((const morkWeeBookAtom*) this)->mWeeBookAtom_Body; + } + else if ( this->IsBigBook() ) + { + size = ((const morkBigBookAtom*) this)->mBigBookAtom_Size; + body = ((const morkBigBookAtom*) this)->mBigBookAtom_Body; + } + else if ( this->IsFarBook() ) + { + size = ((const morkFarBookAtom*) this)->mFarBookAtom_Size; + body = ((const morkFarBookAtom*) this)->mFarBookAtom_Body; + } + else + { + this->NonBookAtomTypeError(ev); + return 0; + } + + const mork_u1* end = body + size; + while ( body < end ) + { + c = *body++; + outHash <<= 4; + outHash += c; + mork_u4 top = outHash & 0xF0000000L; // top four bits + if ( top ) // any of high four bits equal to one? + { + outHash ^= (top >> 24); // fold down high bits + outHash ^= top; // zero top four bits + } + } + + return outHash; +} + +mork_bool +morkBookAtom::EqualFormAndBody(morkEnv* ev, const morkBookAtom* inAtom) const +{ + mork_bool outEqual = morkBool_kFalse; + + const mork_u1* body = 0; // body of inAtom bytes to compare + mork_size size; // the number of inAtom bytes to compare + mork_cscode form; // nominal charset for ioAtom + + if ( inAtom->IsWeeBook() ) + { + size = inAtom->mAtom_Size; + body = ((const morkWeeBookAtom*) inAtom)->mWeeBookAtom_Body; + form = 0; + } + else if ( inAtom->IsBigBook() ) + { + size = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Size; + body = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Body; + form = ((const morkBigBookAtom*) inAtom)->mBigBookAtom_Form; + } + else if ( inAtom->IsFarBook() ) + { + size = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Size; + body = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Body; + form = ((const morkFarBookAtom*) inAtom)->mFarBookAtom_Form; + } + else + { + inAtom->NonBookAtomTypeError(ev); + return morkBool_kFalse; + } + + const mork_u1* thisBody = 0; // body of bytes in this to compare + mork_size thisSize; // the number of bytes in this to compare + mork_cscode thisForm; // nominal charset for this atom + + if ( this->IsWeeBook() ) + { + thisSize = mAtom_Size; + thisBody = ((const morkWeeBookAtom*) this)->mWeeBookAtom_Body; + thisForm = 0; + } + else if ( this->IsBigBook() ) + { + thisSize = ((const morkBigBookAtom*) this)->mBigBookAtom_Size; + thisBody = ((const morkBigBookAtom*) this)->mBigBookAtom_Body; + thisForm = ((const morkBigBookAtom*) this)->mBigBookAtom_Form; + } + else if ( this->IsFarBook() ) + { + thisSize = ((const morkFarBookAtom*) this)->mFarBookAtom_Size; + thisBody = ((const morkFarBookAtom*) this)->mFarBookAtom_Body; + thisForm = ((const morkFarBookAtom*) this)->mFarBookAtom_Form; + } + else + { + this->NonBookAtomTypeError(ev); + return morkBool_kFalse; + } + + // if atoms are empty, form is irrelevant + if ( body && thisBody && size == thisSize && (!size || form == thisForm )) + outEqual = (MORK_MEMCMP(body, thisBody, size) == 0); + + return outEqual; +} + + +void +morkBookAtom::CutBookAtomFromSpace(morkEnv* ev) +{ + morkAtomSpace* space = mBookAtom_Space; + if ( space ) + { + mBookAtom_Space = 0; + space->mAtomSpace_AtomBodies.CutAtom(ev, this); + space->mAtomSpace_AtomAids.CutAtom(ev, this); + } + else + ev->NilPointerError(); +} + +morkWeeBookAtom::morkWeeBookAtom(mork_aid inAid) +{ + mAtom_Kind = morkAtom_kKindWeeBook; + mAtom_CellUses = 0; + mAtom_Change = morkChange_kNil; + mAtom_Size = 0; + + mBookAtom_Space = 0; + mBookAtom_Id = inAid; + + mWeeBookAtom_Body[ 0 ] = 0; +} + +void +morkWeeBookAtom::InitWeeBookAtom(morkEnv* ev, const morkBuf& inBuf, + morkAtomSpace* ioSpace, mork_aid inAid) +{ + mAtom_Kind = 0; + mAtom_Change = morkChange_kNil; + if ( ioSpace ) + { + if ( inAid ) + { + if ( inBuf.mBuf_Fill <= morkAtom_kMaxByteSize ) + { + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindWeeBook; + mBookAtom_Space = ioSpace; + mBookAtom_Id = inAid; + mork_size size = inBuf.mBuf_Fill; + mAtom_Size = (mork_u1) size; + if ( size && inBuf.mBuf_Body ) + MORK_MEMCPY(mWeeBookAtom_Body, inBuf.mBuf_Body, size); + + mWeeBookAtom_Body[ size ] = 0; + } + else + this->AtomSizeOverflowError(ev); + } + else + this->ZeroAidError(ev); + } + else + ev->NilPointerError(); +} + +void +morkBigBookAtom::InitBigBookAtom(morkEnv* ev, const morkBuf& inBuf, + mork_cscode inForm, morkAtomSpace* ioSpace, mork_aid inAid) +{ + mAtom_Kind = 0; + mAtom_Change = morkChange_kNil; + if ( ioSpace ) + { + if ( inAid ) + { + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindBigBook; + mAtom_Size = 0; + mBookAtom_Space = ioSpace; + mBookAtom_Id = inAid; + mBigBookAtom_Form = inForm; + mork_size size = inBuf.mBuf_Fill; + mBigBookAtom_Size = size; + if ( size && inBuf.mBuf_Body ) + MORK_MEMCPY(mBigBookAtom_Body, inBuf.mBuf_Body, size); + + mBigBookAtom_Body[ size ] = 0; + } + else + this->ZeroAidError(ev); + } + else + ev->NilPointerError(); +} + +void morkFarBookAtom::InitFarBookAtom(morkEnv* ev, const morkBuf& inBuf, + mork_cscode inForm, morkAtomSpace* ioSpace, mork_aid inAid) +{ + mAtom_Kind = 0; + mAtom_Change = morkChange_kNil; + if ( ioSpace ) + { + if ( inAid ) + { + mAtom_CellUses = 0; + mAtom_Kind = morkAtom_kKindFarBook; + mAtom_Size = 0; + mBookAtom_Space = ioSpace; + mBookAtom_Id = inAid; + mFarBookAtom_Form = inForm; + mFarBookAtom_Size = inBuf.mBuf_Fill; + mFarBookAtom_Body = (mork_u1*) inBuf.mBuf_Body; + } + else + this->ZeroAidError(ev); + } + else + ev->NilPointerError(); +} + +//3456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789 + |