-/*
- * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
- *
- * The contents of this file constitute Original Code as defined in and are
- * subject to the Apple Public Source License Version 1.2 (the 'License').
- * You may not use this file except in compliance with the License. Please obtain
- * a copy of the License at http://www.apple.com/publicsource and read it before
- * using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
- * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
- * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
- * specific language governing rights and limitations under the License.
- */
-
-
-//
-// MetaAttribute.cpp
-//
-
-#include "MetaAttribute.h"
-#include "MetaRecord.h"
-
-MetaAttribute::~MetaAttribute()
-{
-}
-
-// Construct an instance of an appropriate subclass of MetaAttribute
-// based on the given format.
-
-MetaAttribute *
-MetaAttribute::create(Format format, uint32 attributeIndex,
- uint32 attributeId)
-{
- switch (format)
- {
- case CSSM_DB_ATTRIBUTE_FORMAT_STRING:
- return new TypedMetaAttribute<StringValue>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_SINT32:
- return new TypedMetaAttribute<SInt32Value>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_UINT32:
- return new TypedMetaAttribute<UInt32Value>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_BIG_NUM:
- return new TypedMetaAttribute<BigNumValue>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_REAL:
- return new TypedMetaAttribute<DoubleValue>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_TIME_DATE:
- return new TypedMetaAttribute<TimeDateValue>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_BLOB:
- return new TypedMetaAttribute<BlobValue>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_MULTI_UINT32:
- return new TypedMetaAttribute<MultiUInt32Value>(format, attributeIndex, attributeId);
-
- case CSSM_DB_ATTRIBUTE_FORMAT_COMPLEX:
- default:
- CssmError::throwMe(CSSMERR_DL_UNSUPPORTED_FIELD_FORMAT);
- }
-}
-
-void
-MetaAttribute::packNumberOfValues(WriteSection &ws, uint32 numValues, uint32 &valueOffset) const
-{
- uint32 offset = MetaRecord::OffsetAttributeOffsets + mAttributeIndex * AtomSize;
-
- if (numValues == 0) {
- // a zero offset means the attribute has no values
- ws.put(offset, 0);
- }
- else if (numValues == 1) {
- // setting the low bit of the offset means that there is exactly one value
- ws.put(offset, valueOffset | 1);
- }
- else {
- // write the offset, then write the number of values at that position
- ws.put(offset, valueOffset);
- valueOffset = ws.put(valueOffset, numValues);
- }
-}
-
-void
-MetaAttribute::unpackNumberOfValues(const ReadSection &rs, uint32 &numValues,
- uint32 &valueOffset) const
-{
- uint32 offset = MetaRecord::OffsetAttributeOffsets + mAttributeIndex * AtomSize;
- valueOffset = rs[offset];
-
- if (valueOffset == 0)
- // a zero offset means no values
- numValues = 0;
- else if (valueOffset & 1) {
- // setting the LSB means exactly one value
- valueOffset ^= 1;
- numValues = 1;
- }
- else {
- // otherwise, the number of values is at the offset, and the values follow
- numValues = rs[valueOffset];
- valueOffset += AtomSize;
- }
-}
-
-void
-MetaAttribute::packAttribute(WriteSection &ws, uint32 &valueOffset, uint32 numValues,
- const CSSM_DATA *values) const
-{
- packNumberOfValues(ws, numValues, valueOffset);
- for (uint32 i = 0; i < numValues; i++)
- packValue(ws, valueOffset, values[i]);
-}
-
-void
-MetaAttribute::unpackAttribute(const ReadSection &rs, Allocator &allocator,
- uint32 &numValues, CSSM_DATA *&values) const
-{
- uint32 valueOffset;
- unpackNumberOfValues(rs, numValues, valueOffset);
-
- // Rough check for number of values; will be more like 10 or 20
- if (numValues > 1024)
- CssmError::throwMe(CSSMERR_DL_DATABASE_CORRUPT);
-
- values = reinterpret_cast<CSSM_DATA *>(allocator.malloc(numValues * sizeof(CSSM_DATA)));
-
- for (uint32 i = 0; i < numValues; i++)
- unpackValue(rs, valueOffset, values[i], allocator);
-}
-
-uint32
-MetaAttribute::getNumberOfValues(const ReadSection &rs) const
-{
- uint32 numValues, valueOffset;
- unpackNumberOfValues(rs, numValues, valueOffset);
- return numValues;
-}
-
-void
-MetaAttribute::copyValueBytes(uint32 valueIndex, const ReadSection &rs, WriteSection &ws,
- uint32 &writeOffset) const
-{
- uint32 numValues, valueOffset;
- unpackNumberOfValues(rs, numValues, valueOffset);
-
- // skip bytes before the desired value
- for (uint32 i = 0; i < valueIndex; i++)
- skipValue(rs, valueOffset);
-
- // copy the value bytes into the write section
- copyValue(rs, valueOffset, ws, writeOffset);
-}