1 files changed, 0 insertions, 638 deletions

diff --git a/fitz/res_store.c b/fitz/res_store.c
deleted file mode 100644
index 609f10dc..00000000
--- a/fitz/res_store.c
+++ /dev/null
@@ -1,638 +0,0 @@
-#include "mupdf/fitz.h"
-
-typedef struct fz_item_s fz_item;
-
-struct fz_item_s
-{
-	void *key;
-	fz_storable *val;
-	unsigned int size;
-	fz_item *next;
-	fz_item *prev;
-	fz_store *store;
-	fz_store_type *type;
-};
-
-struct fz_store_s
-{
-	int refs;
-
-	/* Every item in the store is kept in a doubly linked list, ordered
-	 * by usage (so LRU entries are at the end). */
-	fz_item *head;
-	fz_item *tail;
-
-	/* We have a hash table that allows to quickly find a subset of the
-	 * entries (those whose keys are indirect objects). */
-	fz_hash_table *hash;
-
-	/* We keep track of the size of the store, and keep it below max. */
-	unsigned int max;
-	unsigned int size;
-};
-
-void
-fz_new_store_context(fz_context *ctx, unsigned int max)
-{
-	fz_store *store;
-	store = fz_malloc_struct(ctx, fz_store);
-	fz_try(ctx)
-	{
-		store->hash = fz_new_hash_table(ctx, 4096, sizeof(fz_store_hash), FZ_LOCK_ALLOC);
-	}
-	fz_catch(ctx)
-	{
-		fz_free(ctx, store);
-		fz_rethrow(ctx);
-	}
-	store->refs = 1;
-	store->head = NULL;
-	store->tail = NULL;
-	store->size = 0;
-	store->max = max;
-	ctx->store = store;
-}
-
-void *
-fz_keep_storable(fz_context *ctx, fz_storable *s)
-{
-	if (s == NULL)
-		return NULL;
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	if (s->refs > 0)
-		s->refs++;
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-	return s;
-}
-
-void
-fz_drop_storable(fz_context *ctx, fz_storable *s)
-{
-	int do_free = 0;
-
-	if (s == NULL)
-		return;
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	if (s->refs < 0)
-	{
-		/* It's a static object. Dropping does nothing. */
-	}
-	else if (--s->refs == 0)
-	{
-		/* If we are dropping the last reference to an object, then
-		 * it cannot possibly be in the store (as the store always
-		 * keeps a ref to everything in it, and doesn't drop via
-		 * this method. So we can simply drop the storable object
-		 * itself without any operations on the fz_store. */
-		do_free = 1;
-	}
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-	if (do_free)
-		s->free(ctx, s);
-}
-
-static void
-evict(fz_context *ctx, fz_item *item)
-{
-	fz_store *store = ctx->store;
-	int drop;
-
-	store->size -= item->size;
-	/* Unlink from the linked list */
-	if (item->next)
-		item->next->prev = item->prev;
-	else
-		store->tail = item->prev;
-	if (item->prev)
-		item->prev->next = item->next;
-	else
-		store->head = item->next;
-	/* Drop a reference to the value (freeing if required) */
-	drop = (item->val->refs > 0 && --item->val->refs == 0);
-	/* Remove from the hash table */
-	if (item->type->make_hash_key)
-	{
-		fz_store_hash hash = { NULL };
-		hash.free = item->val->free;
-		if (item->type->make_hash_key(&hash, item->key))
-			fz_hash_remove(ctx, store->hash, &hash);
-	}
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-	if (drop)
-		item->val->free(ctx, item->val);
-	/* Always drops the key and free the item */
-	item->type->drop_key(ctx, item->key);
-	fz_free(ctx, item);
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-}
-
-static int
-ensure_space(fz_context *ctx, unsigned int tofree)
-{
-	fz_item *item, *prev;
-	unsigned int count;
-	fz_store *store = ctx->store;
-
-	fz_assert_lock_held(ctx, FZ_LOCK_ALLOC);
-
-	/* First check that we *can* free tofree; if not, we'd rather not
-	 * cache this. */
-	count = 0;
-	for (item = store->tail; item; item = item->prev)
-	{
-		if (item->val->refs == 1)
-		{
-			count += item->size;
-			if (count >= tofree)
-				break;
-		}
-	}
-
-	/* If we ran out of items to search, then we can never free enough */
-	if (item == NULL)
-	{
-		return 0;
-	}
-
-	/* Actually free the items */
-	count = 0;
-	for (item = store->tail; item; item = prev)
-	{
-		prev = item->prev;
-		if (item->val->refs == 1)
-		{
-			/* Free this item. Evict has to drop the lock to
-			 * manage that, which could cause prev to be removed
-			 * in the meantime. To avoid that we bump its reference
-			 * count here. This may cause another simultaneous
-			 * evict process to fail to make enough space as prev is
-			 * pinned - but that will only happen if we're near to
-			 * the limit anyway, and it will only cause something to
-			 * not be cached. */
-			count += item->size;
-			if (prev)
-				prev->val->refs++;
-			evict(ctx, item); /* Drops then retakes lock */
-			/* So the store has 1 reference to prev, as do we, so
-			 * no other evict process can have thrown prev away in
-			 * the meantime. So we are safe to just decrement its
-			 * reference count here. */
-			if (prev)
-				--prev->val->refs;
-
-			if (count >= tofree)
-				return count;
-		}
-	}
-
-	return count;
-}
-
-static void
-touch(fz_store *store, fz_item *item)
-{
-	if (item->next != item)
-	{
-		/* Already in the list - unlink it */
-		if (item->next)
-			item->next->prev = item->prev;
-		else
-			store->tail = item->prev;
-		if (item->prev)
-			item->prev->next = item->next;
-		else
-			store->head = item->next;
-	}
-	/* Now relink it at the start of the LRU chain */
-	item->next = store->head;
-	if (item->next)
-		item->next->prev = item;
-	else
-		store->tail = item;
-	store->head = item;
-	item->prev = NULL;
-}
-
-void *
-fz_store_item(fz_context *ctx, void *key, void *val_, unsigned int itemsize, fz_store_type *type)
-{
-	fz_item *item = NULL;
-	unsigned int size;
-	fz_storable *val = (fz_storable *)val_;
-	fz_store *store = ctx->store;
-	fz_store_hash hash = { NULL };
-	int use_hash = 0;
-	unsigned pos;
-
-	if (!store)
-		return NULL;
-
-	fz_var(item);
-
-	if (store->max != FZ_STORE_UNLIMITED && store->max < itemsize)
-	{
-		/* Our item would take up more room than we can ever
-		 * possibly have in the store. Just give up now. */
-		return NULL;
-	}
-
-	/* If we fail for any reason, we swallow the exception and continue.
-	 * All that the above program will see is that we failed to store
-	 * the item. */
-	fz_try(ctx)
-	{
-		item = fz_malloc_struct(ctx, fz_item);
-	}
-	fz_catch(ctx)
-	{
-		return NULL;
-	}
-
-	if (type->make_hash_key)
-	{
-		hash.free = val->free;
-		use_hash = type->make_hash_key(&hash, key);
-	}
-
-	type->keep_key(ctx, key);
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-
-	/* Fill out the item. To start with, we always set item->next == item
-	 * and item->prev == item. This is so that we can spot items that have
-	 * been put into the hash table without having made it into the linked
-	 * list yet. */
-	item->key = key;
-	item->val = val;
-	item->size = itemsize;
-	item->next = item;
-	item->prev = item;
-	item->type = type;
-
-	/* If we can index it fast, put it into the hash table. This serves
-	 * to check whether we have one there already. */
-	if (use_hash)
-	{
-		fz_item *existing;
-
-		fz_try(ctx)
-		{
-			/* May drop and retake the lock */
-			existing = fz_hash_insert_with_pos(ctx, store->hash, &hash, item, &pos);
-		}
-		fz_catch(ctx)
-		{
-			/* Any error here means that item never made it into the
-			 * hash - so no one else can have a reference. */
-			fz_unlock(ctx, FZ_LOCK_ALLOC);
-			fz_free(ctx, item);
-			type->drop_key(ctx, key);
-			return NULL;
-		}
-		if (existing)
-		{
-			/* There was one there already! Take a new reference
-			 * to the existing one, and drop our current one. */
-			touch(store, existing);
-			if (existing->val->refs > 0)
-				existing->val->refs++;
-			fz_unlock(ctx, FZ_LOCK_ALLOC);
-			fz_free(ctx, item);
-			type->drop_key(ctx, key);
-			return existing->val;
-		}
-	}
-	/* Now bump the ref */
-	if (val->refs > 0)
-		val->refs++;
-	/* If we haven't got an infinite store, check for space within it */
-	if (store->max != FZ_STORE_UNLIMITED)
-	{
-		size = store->size + itemsize;
-		while (size > store->max)
-		{
-			/* ensure_space may drop, then retake the lock */
-			int saved = ensure_space(ctx, size - store->max);
-			if (saved == 0)
-			{
-				/* Failed to free any space. */
-				/* If we are using the hash table, then we've already
-				 * inserted item - remove it. */
-				if (use_hash)
-				{
-					/* If someone else has already picked up a reference
-					 * to item, then we cannot remove it. Leave it in the
-					 * store, and we'll live with being over budget. We
-					 * know this is the case, if it's in the linked list. */
-					if (item->next != item)
-						break;
-					fz_hash_remove_fast(ctx, store->hash, &hash, pos);
-				}
-				fz_unlock(ctx, FZ_LOCK_ALLOC);
-				fz_free(ctx, item);
-				type->drop_key(ctx, key);
-				if (val->refs > 0)
-					val->refs--;
-				return NULL;
-			}
-			size -= saved;
-		}
-	}
-	store->size += itemsize;
-
-	/* Regardless of whether it's indexed, it goes into the linked list */
-	touch(store, item);
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-
-	return NULL;
-}
-
-void *
-fz_find_item(fz_context *ctx, fz_store_free_fn *free, void *key, fz_store_type *type)
-{
-	fz_item *item;
-	fz_store *store = ctx->store;
-	fz_store_hash hash = { NULL };
-	int use_hash = 0;
-
-	if (!store)
-		return NULL;
-
-	if (!key)
-		return NULL;
-
-	if (type->make_hash_key)
-	{
-		hash.free = free;
-		use_hash = type->make_hash_key(&hash, key);
-	}
-
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	if (use_hash)
-	{
-		/* We can find objects keyed on indirected objects quickly */
-		item = fz_hash_find(ctx, store->hash, &hash);
-	}
-	else
-	{
-		/* Others we have to hunt for slowly */
-		for (item = store->head; item; item = item->next)
-		{
-			if (item->val->free == free && !type->cmp_key(item->key, key))
-				break;
-		}
-	}
-	if (item)
-	{
-		/* LRU the block. This also serves to ensure that any item
-		 * picked up from the hash before it has made it into the
-		 * linked list does not get whipped out again due to the
-		 * store being full. */
-		touch(store, item);
-		/* And bump the refcount before returning */
-		if (item->val->refs > 0)
-			item->val->refs++;
-		fz_unlock(ctx, FZ_LOCK_ALLOC);
-		return (void *)item->val;
-	}
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-
-	return NULL;
-}
-
-void
-fz_remove_item(fz_context *ctx, fz_store_free_fn *free, void *key, fz_store_type *type)
-{
-	fz_item *item;
-	fz_store *store = ctx->store;
-	int drop;
-	fz_store_hash hash = { NULL };
-	int use_hash = 0;
-
-	if (type->make_hash_key)
-	{
-		hash.free = free;
-		use_hash = type->make_hash_key(&hash, key);
-	}
-
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	if (use_hash)
-	{
-		/* We can find objects keyed on indirect objects quickly */
-		item = fz_hash_find(ctx, store->hash, &hash);
-		if (item)
-			fz_hash_remove(ctx, store->hash, &hash);
-	}
-	else
-	{
-		/* Others we have to hunt for slowly */
-		for (item = store->head; item; item = item->next)
-			if (item->val->free == free && !type->cmp_key(item->key, key))
-				break;
-	}
-	if (item)
-	{
-		/* Momentarily things can be in the hash table without being
-		 * in the list. Don't attempt to unlink these. We indicate
-		 * such items by setting item->next == item. */
-		if (item->next != item)
-		{
-			if (item->next)
-				item->next->prev = item->prev;
-			else
-				store->tail = item->prev;
-			if (item->prev)
-				item->prev->next = item->next;
-			else
-				store->head = item->next;
-		}
-		drop = (item->val->refs > 0 && --item->val->refs == 0);
-		fz_unlock(ctx, FZ_LOCK_ALLOC);
-		if (drop)
-			item->val->free(ctx, item->val);
-		type->drop_key(ctx, item->key);
-		fz_free(ctx, item);
-	}
-	else
-		fz_unlock(ctx, FZ_LOCK_ALLOC);
-}
-
-void
-fz_empty_store(fz_context *ctx)
-{
-	fz_store *store = ctx->store;
-
-	if (store == NULL)
-		return;
-
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	/* Run through all the items in the store */
-	while (store->head)
-	{
-		evict(ctx, store->head); /* Drops then retakes lock */
-	}
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-}
-
-fz_store *
-fz_keep_store_context(fz_context *ctx)
-{
-	if (ctx == NULL || ctx->store == NULL)
-		return NULL;
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	ctx->store->refs++;
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-	return ctx->store;
-}
-
-void
-fz_drop_store_context(fz_context *ctx)
-{
-	int refs;
-	if (ctx == NULL || ctx->store == NULL)
-		return;
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	refs = --ctx->store->refs;
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-	if (refs != 0)
-		return;
-
-	fz_empty_store(ctx);
-	fz_free_hash(ctx, ctx->store->hash);
-	fz_free(ctx, ctx->store);
-	ctx->store = NULL;
-}
-
-#ifndef NDEBUG
-static void
-print_item(FILE *out, void *item_)
-{
-	fz_item *item = (fz_item *)item_;
-	fprintf(out, " val=%p item=%p\n", item->val, item);
-	fflush(out);
-}
-
-void
-fz_print_store_locked(fz_context *ctx, FILE *out)
-{
-	fz_item *item, *next;
-	fz_store *store = ctx->store;
-
-	fprintf(out, "-- resource store contents --\n");
-	fflush(out);
-
-	for (item = store->head; item; item = next)
-	{
-		next = item->next;
-		if (next)
-			next->val->refs++;
-		fprintf(out, "store[*][refs=%d][size=%d] ", item->val->refs, item->size);
-		fz_unlock(ctx, FZ_LOCK_ALLOC);
-		item->type->debug(out, item->key);
-		fprintf(out, " = %p\n", item->val);
-		fflush(out);
-		fz_lock(ctx, FZ_LOCK_ALLOC);
-		if (next)
-			next->val->refs--;
-	}
-	fprintf(out, "-- resource store hash contents --\n");
-	fz_print_hash_details(ctx, out, store->hash, print_item);
-	fprintf(out, "-- end --\n");
-	fflush(out);
-}
-
-void
-fz_print_store(fz_context *ctx, FILE *out)
-{
-	fz_lock(ctx, FZ_LOCK_ALLOC);
-	fz_print_store_locked(ctx, out);
-	fz_unlock(ctx, FZ_LOCK_ALLOC);
-}
-#endif
-
-/* This is now an n^2 algorithm - not ideal, but it'll only be bad if we are
- * actually managing to scavenge lots of blocks back. */
-static int
-scavenge(fz_context *ctx, unsigned int tofree)
-{
-	fz_store *store = ctx->store;
-	unsigned int count = 0;
-	fz_item *item, *prev;
-
-	/* Free the items */
-	for (item = store->tail; item; item = prev)
-	{
-		prev = item->prev;
-		if (item->val->refs == 1)
-		{
-			/* Free this item */
-			count += item->size;
-			evict(ctx, item); /* Drops then retakes lock */
-
-			if (count >= tofree)
-				break;
-
-			/* Have to restart search again, as prev may no longer
-			 * be valid due to release of lock in evict. */
-			prev = store->tail;
-		}
-	}
-	/* Success is managing to evict any blocks */
-	return count != 0;
-}
-
-int fz_store_scavenge(fz_context *ctx, unsigned int size, int *phase)
-{
-	fz_store *store;
-	unsigned int max;
-
-	if (ctx == NULL)
-		return 0;
-	store = ctx->store;
-	if (store == NULL)
-		return 0;
-
-#ifdef DEBUG_SCAVENGING
-	printf("Scavenging: store=%d size=%d phase=%d\n", store->size, size, *phase);
-	fz_print_store_locked(ctx, stderr);
-	Memento_stats();
-#endif
-	do
-	{
-		unsigned int tofree;
-
-		/* Calculate 'max' as the maximum size of the store for this phase */
-		if (*phase >= 16)
-			max = 0;
-		else if (store->max != FZ_STORE_UNLIMITED)
-			max = store->max / 16 * (16 - *phase);
-		else
-			max = store->size / (16 - *phase) * (15 - *phase);
-		(*phase)++;
-
-		/* Slightly baroque calculations to avoid overflow */
-		if (size > UINT_MAX - store->size)
-			tofree = UINT_MAX - max;
-		else if (size + store->size > max)
-			continue;
-		else
-			tofree = size + store->size - max;
-
-		if (scavenge(ctx, tofree))
-		{
-#ifdef DEBUG_SCAVENGING
-			printf("scavenged: store=%d\n", store->size);
-			fz_print_store(ctx, stderr);
-			Memento_stats();
-#endif
-			return 1;
-		}
-	}
-	while (max > 0);
-
-#ifdef DEBUG_SCAVENGING
-	printf("scavenging failed\n");
-	fz_print_store(ctx, stderr);
-	Memento_listBlocks();
-#endif
-	return 0;
-}