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StorageAPI: Avoid reallocations of the parent data for WUPS_STORAGE_TYPE_ITEM items. This is dirty workaround to keep outPtr of WUPS_CreateSubItem always valid.

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Maschell 2023-01-24 14:28:57 +01:00
parent 8306df96ae
commit 933e676c52
2 changed files with 61 additions and 30 deletions
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1
include/wups/storage.h
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@ -27,6 +27,7 @@ typedef enum {
WUPS_STORAGE_ERROR_B64_DECODE_FAILED = -9,
WUPS_STORAGE_ERROR_BUFFER_TOO_SMALL = -10,
WUPS_STORAGE_ERROR_MALLOC_FAILED = -11,
WUPS_STORAGE_ERROR_SUB_ITEM_REALLOC = -12,
} WUPSStorageError;
typedef struct wups_storage_item_t_ {

62
libraries/libwups/storage.cpp
View File

@ -55,6 +55,8 @@ const char *WUPS_GetStorageStatusStr(WUPSStorageError status) {
return "WUPS_STORAGE_ERROR_BUFFER_TOO_SMALL";
case WUPS_STORAGE_ERROR_MALLOC_FAILED:
return "WUPS_STORAGE_ERROR_MALLOC_FAILED";
case WUPS_STORAGE_ERROR_SUB_ITEM_REALLOC:
return "WUPS_STORAGE_ERROR_SUB_ITEM_REALLOC";
}
return "WUPS_STORAGE_ERROR_UNKNOWN";
}
@ -180,16 +182,23 @@ WUPSStorageError WUPS_DeleteItem(wups_storage_item_t *parent, const char *key) {
// return WUPS_STORAGE_ERROR_NOT_FOUND;
// }
static wups_storage_item_t *addItem(wups_storage_item_t *parent, const char *key, wups_storage_type_t type) {
static wups_storage_item_t *addItem(wups_storage_item_t *parent, const char *key, wups_storage_type_t type, WUPSStorageError *error) {
wups_storage_item_t *foundItem = nullptr;
// First check for existing item with the same name.
for (uint32_t i = 0; i < parent->data_size; i++) {
wups_storage_item_t *item = &((wups_storage_item_t *) parent->data)[i];
if (strcmp(item->key, key) == 0) {
if (item->key && strcmp(item->key, key) == 0) {
free(item->data);
foundItem = item;
break;
}
}
if (!foundItem) {
// Then check if there are any deleted item we can override.
for (uint32_t i = 0; i < parent->data_size; i++) {
wups_storage_item_t *item = &((wups_storage_item_t *) parent->data)[i];
if (item->pending_delete) {
free(item->data);
@ -197,32 +206,49 @@ static wups_storage_item_t *addItem(wups_storage_item_t *parent, const char *key
item->data = nullptr;
item->key = nullptr;
item->key = (char *) malloc(strlen(key) + 1);
item->key = strdup(key);
if (item->key == nullptr) {
return nullptr;
}
strcpy(item->key, key);
foundItem = item;
break;
}
}
}
if (!foundItem) {
auto *newPtr = (wups_storage_item_t *) realloc(parent->data, (parent->data_size + 1) * sizeof(wups_storage_item_t));
// Only allow allocation for WUPS_STORAGE_TYPE_ITEM if it's the first item.
// The realloc would cause the outPtr of previous WUPS_CreateSubItem call to be invalid.
if (parent->data_size > 0 && type == WUPS_STORAGE_TYPE_ITEM) {
*error = WUPS_STORAGE_ERROR_SUB_ITEM_REALLOC;
return nullptr;
}
// Increase in step of 8 to avoid realloc calls (at the costs of some memory).
constexpr uint32_t INCREASE_SIZE_BY = 8;
auto *newPtr = (wups_storage_item_t *) realloc(parent->data, (parent->data_size + INCREASE_SIZE_BY) * sizeof(wups_storage_item_t));
if (newPtr == nullptr) {
*error = WUPS_STORAGE_ERROR_MALLOC_FAILED;
return nullptr;
}
parent->data = newPtr;
parent->data_size++;
for (uint32_t j = parent->data_size; j < INCREASE_SIZE_BY; j++) {
auto curItem = &((wups_storage_item_t *) parent->data)[j];
memset(curItem, 0, sizeof(wups_storage_item_t));
curItem->pending_delete = true;
}
foundItem = &((wups_storage_item_t *) parent->data)[parent->data_size - 1];
memset(foundItem, 0, sizeof(wups_storage_item_t));
foundItem = &((wups_storage_item_t *) parent->data)[parent->data_size];
parent->data_size += INCREASE_SIZE_BY;
foundItem->key = (char *) malloc(strlen(key) + 1);
if (foundItem->key == nullptr) {
foundItem->pending_delete = true;
*error = WUPS_STORAGE_ERROR_MALLOC_FAILED;
return nullptr;
}
strcpy(foundItem->key, key);
@ -256,9 +282,10 @@ WUPSStorageError WUPS_CreateSubItem(wups_storage_item_t *parent, const char *key
isDirty = true;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_ITEM);
WUPSStorageError error;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_ITEM, &error);
if (item == nullptr) {
return WUPS_STORAGE_ERROR_MALLOC_FAILED;
return error;
}
*outItem = item;
@ -321,9 +348,10 @@ WUPSStorageError WUPS_StoreString(wups_storage_item_t *parent, const char *key,
isDirty = true;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_STRING);
WUPSStorageError error;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_STRING, &error);
if (item == nullptr) {
return WUPS_STORAGE_ERROR_MALLOC_FAILED;
return error;
}
uint32_t size = strlen(string) + 1;
@ -364,9 +392,10 @@ WUPSStorageError WUPS_StoreInt(wups_storage_item_t *parent, const char *key, int
isDirty = true;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_INT);
WUPSStorageError error;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_INT, &error);
if (item == nullptr) {
return WUPS_STORAGE_ERROR_MALLOC_FAILED;
return error;
}
item->data = malloc(sizeof(int32_t));
@ -402,9 +431,10 @@ WUPSStorageError WUPS_StoreBinary(wups_storage_item_t *parent, const char *key,
isDirty = true;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_STRING);
WUPSStorageError error;
wups_storage_item_t *item = addItem(parent, key, WUPS_STORAGE_TYPE_STRING, &error);
if (item == nullptr) {
return WUPS_STORAGE_ERROR_MALLOC_FAILED;
return error;
}
item->data = b64_encode((const uint8_t *) data, size);