const char* IndexDataKey::decode(const char* start, const char* limit, IndexDataKey* result)
{
KeyPrefix prefix;
const char* p = KeyPrefix::decode(start, limit, &prefix);
if (!p)
return 0;
ASSERT(prefix.m_databaseId);
ASSERT(prefix.m_objectStoreId);
ASSERT(prefix.m_indexId >= MinimumIndexId);
result->m_databaseId = prefix.m_databaseId;
result->m_objectStoreId = prefix.m_objectStoreId;
result->m_indexId = prefix.m_indexId;
result->m_sequenceNumber = -1;
result->m_encodedPrimaryKey = minIDBKey();
p = extractEncodedIDBKey(p, limit, &result->m_encodedUserKey);
if (!p)
return 0;
// [optional] sequence number
if (p == limit)
return p;
p = decodeVarInt(p, limit, result->m_sequenceNumber);
if (!p)
return 0;
// [optional] primary key
if (p == limit)
return p;
p = extractEncodedIDBKey(p, limit, &result->m_encodedPrimaryKey);
if (!p)
return 0;
return p;
}
const char* extractEncodedIDBKey(const char* start, const char* limit, Vector<char>* result)
{
ASSERT(result);
const char* p = start;
if (p >= limit)
return 0;
unsigned char type = *p++;
switch (type) {
case kIDBKeyNullTypeByte:
case kIDBKeyMinKeyTypeByte:
*result = encodeByte(type);
return p;
case kIDBKeyArrayTypeByte:
{
int64_t length;
p = decodeVarInt(p, limit, length);
if (!p)
return 0;
if (length < 0)
return 0;
result->clear();
result->append(start, p - start);
while (length--) {
Vector<char> subkey;
p = extractEncodedIDBKey(p, limit, &subkey);
if (!p)
return 0;
result->append(subkey);
}
return p;
}
case kIDBKeyStringTypeByte:
{
int64_t length;
p = decodeVarInt(p, limit, length);
if (!p)
return 0;
if (p + length * 2 > limit)
return 0;
result->clear();
result->append(start, p - start + length * 2);
return p + length * 2;
}
case kIDBKeyDateTypeByte:
case kIDBKeyNumberTypeByte:
if (p + sizeof(double) > limit)
return 0;
result->clear();
result->append(start, 1 + sizeof(double));
return p + sizeof(double);
}
ASSERT_NOT_REACHED();
return 0;
}
const char* ExistsEntryKey::decode(const char* start, const char* end, ExistsEntryKey* result)
{
KeyPrefix prefix;
const char* p = KeyPrefix::decode(start, end, &prefix);
if (!p)
return 0;
ASSERT(prefix.m_databaseId);
ASSERT(prefix.m_objectStoreId);
ASSERT(prefix.m_indexId == SpecialIndexNumber);
if (p == end)
return 0;
return extractEncodedIDBKey(p, end, &result->m_encodedUserKey);
}