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#include "common.hh"
#include "containers.hh"
struct TStaticStringTableBlock {
int TotalTextLength;
char Text[65536];
};
struct TDynamicStringTableBlock {
int FreeEntries;
int TotalTextLength;
bool Dirty;
uint8 EntryType[256];
uint16 StringOffset[256];
char Text[32768];
};
constexpr int StaticBlockSize = NARRAY(TStaticStringTableBlock::Text);
constexpr int DynamicBlockSize = NARRAY(TDynamicStringTableBlock::Text);
constexpr int DynamicBlockEntries = NARRAY(TDynamicStringTableBlock::EntryType);
enum : uint8 {
DYNAMIC_STRING_FREE = 0,
DYNAMIC_STRING_ALLOCATED = 1,
DYNAMIC_STRING_DELETED = 2,
};
static list<TStaticStringTableBlock> StaticStringTable;
static list<TDynamicStringTableBlock> DynamicStringTable;
const char *AddStaticString(const char *String){
int StringLen = (int)strlen(String);
if((StringLen + 1) > StaticBlockSize){
error("AddStaticString: String zu lang (%d).\n", StringLen);
return NULL;
}
if(StringLen == 0){
return "";
}
listnode<TStaticStringTableBlock> *Node = StaticStringTable.firstNode;
while(Node != NULL){
if((Node->data.TotalTextLength + StringLen + 1) <= StaticBlockSize){
break;
}
Node = Node->next;
}
if(Node == NULL){
Node = StaticStringTable.append();
memset(&Node->data, 0, sizeof(TStaticStringTableBlock));
}
TStaticStringTableBlock *Block = &Node->data;
char *Result = &Block->Text[Block->TotalTextLength];
memcpy(Result, String, StringLen + 1);
Block->TotalTextLength += StringLen + 1;
return Result;
}
uint32 AddDynamicString(const char *String){
int StringLen = (int)strlen(String);
if((StringLen + 1) > DynamicBlockSize){
error("AddDynamicString: String zu lang (%d)\n", StringLen);
return 0;
}
if(StringLen == 0){
return 0;
}
int BlockIndex = 0;
listnode<TDynamicStringTableBlock> *Node = DynamicStringTable.firstNode;
while(Node != NULL){
if(Node->data.FreeEntries > 0){
if((Node->data.TotalTextLength + StringLen + 1) <= DynamicBlockSize){
break;
}
}
Node = Node->next;
BlockIndex += 1;
}
if(Node == NULL){
Node = DynamicStringTable.append();
memset(&Node->data, 0, sizeof(TDynamicStringTableBlock));
Node->data.FreeEntries = DynamicBlockEntries;
}
TDynamicStringTableBlock *Block = &Node->data;
int EntryIndex = -1;
for(int i = 0; i < DynamicBlockEntries; i += 1){
if(Block->EntryType[i] == DYNAMIC_STRING_FREE){
EntryIndex = i;
break;
}
}
if(EntryIndex == -1){
error("AddDynamicString: Keinen freien Platz gefunden.\n");
return 0;
}
int StringOffset = Block->TotalTextLength;
Block->FreeEntries -= 1;
Block->TotalTextLength += StringLen + 1;
Block->EntryType[EntryIndex] = DYNAMIC_STRING_ALLOCATED;
Block->StringOffset[EntryIndex] = (uint16)StringOffset;
memcpy(&Block->Text[StringOffset], String, StringLen + 1);
return (uint32)(1 + BlockIndex * DynamicBlockEntries + EntryIndex);
}
const char *GetDynamicString(uint32 Number){
if(Number == 0){
return NULL;
}
int BlockIndex = (int)(Number - 1) / DynamicBlockEntries;
int EntryIndex = (int)(Number - 1) % DynamicBlockEntries;
listnode<TDynamicStringTableBlock> *Node = DynamicStringTable.firstNode;
while(BlockIndex > 0 && Node != NULL){
Node = Node->next;
BlockIndex -= 1;
}
if(Node == NULL){
error("GetDynamicString: Block für String %u existiert nicht\n", Number);
return NULL;
}
TDynamicStringTableBlock *Block = &Node->data;
if(Block->EntryType[EntryIndex] != DYNAMIC_STRING_ALLOCATED){
error("GetDynamicString: Eintrag für String %u existiert nicht\n", Number);
return NULL;
}
int StringOffset = (int)Block->StringOffset[EntryIndex];
return &Block->Text[StringOffset];
}
void DeleteDynamicString(uint32 Number){
if(Number == 0){
return;
}
int BlockIndex = (int)(Number - 1) / DynamicBlockEntries;
int EntryIndex = (int)(Number - 1) % DynamicBlockEntries;
listnode<TDynamicStringTableBlock> *Node = DynamicStringTable.firstNode;
while(BlockIndex > 0 && Node != NULL){
Node = Node->next;
BlockIndex -= 1;
}
if(Node == NULL){
error("DeleteDynamicString: Block für String %u existiert nicht\n", Number);
return;
}
TDynamicStringTableBlock *Block = &Node->data;
if(Block->EntryType[EntryIndex] != DYNAMIC_STRING_ALLOCATED){
error("DeleteDynamicString: Eintrag für String %u existiert nicht\n", Number);
return;
}
Block->EntryType[EntryIndex] = DYNAMIC_STRING_DELETED;
Block->Dirty = true;
}
void CleanupDynamicStrings(void){
// IMPORTANT(fusion): The way we manage dynamic strings also mean pointers
// returned from `GetDynamicString` aren't stable.
for(listnode<TDynamicStringTableBlock> *Node = DynamicStringTable.firstNode;
Node != NULL;
Node = Node->next){
TDynamicStringTableBlock *Block = &Node->data;
if(!Block->Dirty){
continue;
}
for(int i = 0; i < DynamicBlockEntries; i += 1){
if(Block->EntryType[i] == DYNAMIC_STRING_DELETED){
int StringOffset = Block->StringOffset[i];
char *String = &Block->Text[StringOffset];
int StringLen = (int)strlen(String);
int StringEnd = StringOffset + StringLen + 1;
Block->EntryType[i] = DYNAMIC_STRING_FREE;
if(StringEnd > DynamicBlockSize){
error("CleanupDynamicStrings: Stringende fehlt\n");
continue;
}
if(StringEnd < DynamicBlockSize){
memmove(String, String + StringEnd, DynamicBlockSize - StringEnd);
}
for(int j = 0; j < DynamicBlockEntries; j += 1){
if(Block->EntryType[j] != DYNAMIC_STRING_FREE
&& Block->StringOffset[j] > StringOffset){
Block->StringOffset[j] -= StringLen + 1;
}
}
}
}
}
}
void InitStrings(void){
// no-op
}
void ExitStrings(void){
// no-op
}
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