Remove the nowadays unneeded memory limitting malloc() wrapper.

5 files changed, 0 insertions, 498 deletions

diff --git a/src/liblzma/api/Makefile.am b/src/liblzma/api/Makefile.am
index 86ce5bda..a36bf3ed 100644
--- a/src/liblzma/api/Makefile.am
+++ b/src/liblzma/api/Makefile.am
@@ -25,7 +25,6 @@ nobase_include_HEADERS = \
 	lzma/index_hash.h \
 	lzma/init.h \
 	lzma/lzma.h \
-	lzma/memlimit.h \
 	lzma/simple.h \
 	lzma/stream_flags.h \
 	lzma/subblock.h \
diff --git a/src/liblzma/api/lzma.h b/src/liblzma/api/lzma.h
index 0f109eb3..d954b8e1 100644
--- a/src/liblzma/api/lzma.h
+++ b/src/liblzma/api/lzma.h
@@ -208,7 +208,6 @@ extern "C" {
 #include "lzma/index.h"
 #include "lzma/index_hash.h"
 #include "lzma/stream_flags.h"
-#include "lzma/memlimit.h"
 
 /*
  * All subheaders included. Undefine LZMA_H_INTERNAL to prevent applications
diff --git a/src/liblzma/api/lzma/memlimit.h b/src/liblzma/api/lzma/memlimit.h
deleted file mode 100644
index 836b0854..00000000
--- a/src/liblzma/api/lzma/memlimit.h
+++ /dev/null
@@ -1,207 +0,0 @@
-/**
- * \file        lzma/memlimit.h
- * \brief       Memory usage limiter
- *
- * \author      Copyright (C) 1999-2006 Igor Pavlov
- * \author      Copyright (C) 2007 Lasse Collin
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- */
-
-#ifndef LZMA_H_INTERNAL
-#	error Never include this file directly. Use <lzma.h> instead.
-#endif
-
-
-/**
- * \brief       Opaque data type used with the memory usage limiting functions
- */
-typedef struct lzma_memlimit_s lzma_memlimit;
-
-
-/**
- * \brief       Allocates and initializes a new lzma_memlimit structure
- *
- * It is easy to make liblzma to use huge amounts of memory. This can
- * be a problem especially with the decoder, since it a file requiring
- * huge amounts of memory to uncompress could allow even a denial of
- * service attack if the memory usage wasn't limited.
- *
- * liblzma provides a set of functions to control memory usage. Pointers
- * to these functions can be used in lzma_allocator structure, which makes
- * it easy to limit memory usage with liblzma.
- *
- * The memory limiter functions are not tied to limiting memory usage
- * with liblzma itself. You can use them with anything you like.
- *
- * In multi-threaded applications, only one thread at once may use the same
- * lzma_memlimit structure. If there is a need, this limitation may
- * be removed in future versions without breaking the libary API/ABI.
- *
- * \param       limit   Initial memory usage limit in bytes
- *
- * \return      Pointer to allocated and initialized lzma_memlimit
- *              structure. On error, NULL is returned. The reason behind
- *              an error is either that malloc() failed or that the given
- *              limit was so small that it didn't allow allocating even
- *              the lzma_memlimit structure itself.
- *
- * \note        Excluding lzma_memlimit_usage(), the functions whose name begin
- *              lzma_memlimit_ can be used even if lzma_init() hasn't been
- *              called.
- */
-extern lzma_memlimit *lzma_memlimit_create(size_t limit)
-		lzma_attr_warn_unused_result;
-
-
-/**
- * \brief       Sets a new memory usage limit
- *
- * \param       mem     Pointer to a lzma_memlimit structure returned
- *                      earlier by lzma_memry_limit_create().
- * \param       limit   New memory usage limit
- *
- * The new usage limit may be smaller than the amount of memory currently
- * allocated via *mem: New allocations will fail until enough memory has
- * been freed or a new limit is set, but the existing allocatations will
- * stay untouched.
- */
-extern void lzma_memlimit_set(lzma_memlimit *mem, size_t limit);
-
-
-/**
- * \brief       Gets the current memory usage limit
- */
-extern size_t lzma_memlimit_get(const lzma_memlimit *mem)
-		lzma_attr_pure;
-
-
-/**
- * \brief       Gets the amount of currently allocated memory
- *
- * \note        This value includes the sizes of some helper structures,
- *              thus it will always be larger than the total number of
- *              bytes allocated via lzma_memlimit_alloc().
- */
-extern size_t lzma_memlimit_used(const lzma_memlimit *mem)
-		lzma_attr_pure;
-
-
-/**
- * \brief       Gets the maximum amount of memory required in total
- *
- * Returns how much memory was or would have been allocated at the same time.
- * If lzma_memlimit_alloc() was requested so much memory that the limit
- * would have been exceeded or malloc() simply ran out of memory, the
- * requested amount is still included to the value returned by
- * lzma_memlimit_max(). This may be used as a hint how much bigger memory
- * limit would have been needed.
- *
- * If the clear flag is set, the internal variable holding the maximum
- * value is set to the current memory usage (the same value as returned
- * by lzma_memlimit_used()).
- *
- * \note        Usually liblzma needs to allocate many chunks of memory, and
- *              displaying a message like "memory usage limit reached, at
- *              least 1024 bytes would have been needed" may be confusing,
- *              because the next allocation could have been e.g. 8 MiB.
- *
- * \todo        The description of this function is unclear.
- */
-extern size_t lzma_memlimit_max(lzma_memlimit *mem, lzma_bool clear);
-
-
-/**
- * \brief       Checks if memory limit was reached at some point
- *
- * This function is useful to find out if the reason for LZMA_MEM_ERROR
- * was running out of memory or hitting the memory usage limit imposed
- * by lzma_memlimit_alloc(). If the clear argument is true, the internal
- * flag, that indicates that limit was reached, is cleared.
- */
-extern lzma_bool lzma_memlimit_reached(lzma_memlimit *mem, lzma_bool clear);
-
-
-/**
- * \brief       Gets the number of allocations owned by the memory limiter
- *
- * The count does not include the helper structures; if no memory has
- * been allocated with lzma_memlimit_alloc() or all memory allocated
- * has been freed or detached, this will return zero.
- */
-extern size_t lzma_memlimit_count(const lzma_memlimit *mem)
-		lzma_attr_pure;
-
-
-/**
- * \brief       Allocates memory with malloc() if memory limit allows
- *
- * \param       mem     Pointer to a lzma_memlimit structure returned
- *                      earlier by lzma_memry_limit_create().
- * \param       nmemb   Number of elements to allocate. While liblzma always
- *                      sets this to one, this function still takes the
- *                      value of nmemb into account to keep the function
- *                      usable with zlib and libbzip2.
- * \param       size    Size of an element.
- *
- * \return      Pointer to memory allocated with malloc(nmemb * size),
- *              except if nmemb * size == 0 which returns malloc(1).
- *              On error, NULL is returned.
- *
- * \note        This function assumes that nmemb * size is at maximum of
- *              SIZE_MAX. If it isn't, an overflow will occur resulting
- *              invalid amount of memory being allocated.
- */
-extern void *lzma_memlimit_alloc(
-		lzma_memlimit *mem, size_t nmemb, size_t size)
-		lzma_attr_warn_unused_result;
-
-
-/**
- * \brief       Removes the pointer from memory limiting list
- *
- * \param       mem     Pointer to a lzma_memlimit structure returned
- *                      earlier by lzma_memry_limit_create().
- * \param       ptr     Pointer returned earlier by lzma_memlimit_alloc().
- *
- * This function removes ptr from the internal list and decreases the
- * counter of used memory accordingly. The ptr itself isn't freed. This is
- * useful when Extra Records allocated by liblzma using lzma_memlimit
- * are needed by the application and must not be freed when the
- * lzma_memlimit structure is destroyed.
- *
- * It is OK to call this function with ptr that hasn't been allocated with
- * lzma_memlimit_alloc(). In that case, this has no effect other than wasting
- * a few CPU cycles.
- */
-extern void lzma_memlimit_detach(lzma_memlimit *mem, void *ptr);
-
-
-/**
- * \brief       Frees memory and updates the memory limit list
- *
- * This is like lzma_memlimit_detach() but also frees the given pointer.
- */
-extern void lzma_memlimit_free(lzma_memlimit *mem, void *ptr);
-
-
-/**
- * \brief       Frees the memory allocated for and by the memory usage limiter
- *
- * \param       mem             Pointer to memory limiter
- * \param       free_allocated  If this is non-zero, all the memory allocated
- *                              by lzma_memlimit_alloc() using *mem is also
- *                              freed if it hasn't already been freed with
- *                              lzma_memlimit_free(). Usually this should be
- *                              set to true.
- */
-extern void lzma_memlimit_end(
-		lzma_memlimit *mem, lzma_bool free_allocated);
diff --git a/src/liblzma/common/Makefile.am b/src/liblzma/common/Makefile.am
index 2f5532e4..e8794b5b 100644
--- a/src/liblzma/common/Makefile.am
+++ b/src/liblzma/common/Makefile.am
@@ -33,7 +33,6 @@ libcommon_la_SOURCES = \
 	index.c \
 	index.h \
 	init.c \
-	memory_limiter.c \
 	stream_flags_common.c \
 	stream_flags_common.h \
 	vli_size.c
diff --git a/src/liblzma/common/memory_limiter.c b/src/liblzma/common/memory_limiter.c
deleted file mode 100644
index a2a0cbdc..00000000
--- a/src/liblzma/common/memory_limiter.c
+++ /dev/null
@@ -1,288 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-//
-/// \file       memory_limiter.c
-/// \brief      Limitting memory usage
-//
-//  Copyright (C) 2007 Lasse Collin
-//
-//  This library is free software; you can redistribute it and/or
-//  modify it under the terms of the GNU Lesser General Public
-//  License as published by the Free Software Foundation; either
-//  version 2.1 of the License, or (at your option) any later version.
-//
-//  This library is distributed in the hope that it will be useful,
-//  but WITHOUT ANY WARRANTY; without even the implied warranty of
-//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-//  Lesser General Public License for more details.
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#include "common.h"
-
-
-/// Rounds an unsigned integer upwards to the next multiple.
-#define my_ceil(num, multiple) \
-	((num) + (((multiple) - ((num) % (multiple))) % (multiple)))
-
-
-/// Add approximated overhead of malloc() to size and round upwards to the
-/// next multiple of 2 * sizeof(size_t). I suppose that most malloc()
-/// implementations align small allocations this way, but the overhead
-/// varies due to several reasons (free lists, mmap() usage etc.).
-///
-/// This doesn't need to be exact at all. It's enough to take into account
-/// that there is some overhead. That way our memory usage count won't be
-/// horribly wrong if we are used to allocate lots of small memory chunks.
-#define malloc_ceil(size) \
-	my_ceil((size) + 2 * sizeof(void *), 2 * sizeof(size_t))
-
-
-typedef struct lzma_memlimit_list_s lzma_memlimit_list;
-struct lzma_memlimit_list_s {
-	lzma_memlimit_list *next;
-	void *ptr;
-	size_t size;
-};
-
-
-struct lzma_memlimit_s {
-	/// List of allocated memory chunks
-	lzma_memlimit_list *list;
-
-	/// Number of bytes currently allocated; this includes the memory
-	/// needed for the helper structures.
-	size_t used;
-
-	/// Memory usage limit
-	size_t limit;
-
-	/// Maximum amount of memory that have been or would have been needed.
-	/// That is, this is updated also if memory allocation fails, letting
-	/// the application check how much memory was tried to be allocated
-	/// in total.
-	size_t max;
-
-	/// True if lzma_memlimit_alloc() has returned NULL due to memory
-	/// usage limit.
-	bool limit_reached;
-};
-
-
-extern LZMA_API lzma_memlimit *
-lzma_memlimit_create(size_t limit)
-{
-	const size_t base_size = malloc_ceil(sizeof(lzma_memlimit));
-
-	if (limit < base_size)
-		return NULL;
-
-	lzma_memlimit *mem = malloc(sizeof(lzma_memlimit));
-
-	if (mem != NULL) {
-		mem->list = NULL;
-		mem->used = base_size;
-		mem->limit = limit;
-		mem->max = base_size;
-		mem->limit_reached = false;
-	}
-
-	return mem;
-}
-
-
-extern LZMA_API void
-lzma_memlimit_set(lzma_memlimit *mem, size_t limit)
-{
-	mem->limit = limit;
-	return;
-}
-
-
-extern LZMA_API size_t
-lzma_memlimit_get(const lzma_memlimit *mem)
-{
-	return mem->limit;
-}
-
-
-extern LZMA_API size_t
-lzma_memlimit_used(const lzma_memlimit *mem)
-{
-	return mem->used;
-}
-
-
-extern LZMA_API size_t
-lzma_memlimit_max(lzma_memlimit *mem, lzma_bool clear)
-{
-	const size_t ret = mem->max;
-
-	if (clear)
-		mem->max = mem->used;
-
-	return ret;
-}
-
-
-extern LZMA_API lzma_bool
-lzma_memlimit_reached(lzma_memlimit *mem, lzma_bool clear)
-{
-	const bool ret = mem->limit_reached;
-
-	if (clear)
-		mem->limit_reached = false;
-
-	return ret;
-}
-
-
-extern LZMA_API size_t
-lzma_memlimit_count(const lzma_memlimit *mem)
-{
-	// This is slow; we could have a counter in lzma_memlimit
-	// for fast version. I expect the primary use of this
-	// function to be limited to easy checking of memory leaks,
-	// in which this implementation is just fine.
-	size_t count = 0;
-	const lzma_memlimit_list *record = mem->list;
-
-	while (record != NULL) {
-		++count;
-		record = record->next;
-	}
-
-	return count;
-}
-
-
-extern LZMA_API void
-lzma_memlimit_end(lzma_memlimit *mem, lzma_bool free_allocated)
-{
-	if (mem == NULL)
-		return;
-
-	lzma_memlimit_list *record = mem->list;
-	while (record != NULL) {
-		if (free_allocated)
-			free(record->ptr);
-
-		lzma_memlimit_list *tmp = record;
-		record = record->next;
-		free(tmp);
-	}
-
-	free(mem);
-
-	return;
-}
-
-
-extern LZMA_API void *
-lzma_memlimit_alloc(lzma_memlimit *mem, size_t nmemb, size_t size)
-{
-	// While liblzma always sets nmemb to one, do this multiplication
-	// to make these functions usable e.g. with zlib and libbzip2.
-	// Making sure that this doesn't overflow is up to the application.
-	size *= nmemb;
-
-	// Some malloc() implementations return NULL on malloc(0). We like
-	// to get a non-NULL value.
-	if (size == 0)
-		size = 1;
-
-	// Calculate how much memory we are going to allocate in reality.
-	const size_t total_size = malloc_ceil(size)
-			+ malloc_ceil(sizeof(lzma_memlimit_list));
-
-	// Integer overflow protection for total_size and mem->used.
-	if (total_size <= size || SIZE_MAX - total_size < mem->used) {
-		mem->max = SIZE_MAX;
-		mem->limit_reached = true;
-		return NULL;
-	}
-
-	// Update the maximum memory requirement counter if needed. This
-	// is updated even if memory allocation would fail or limit would
-	// be reached.
-	if (mem->used + total_size > mem->max)
-		mem->max = mem->used + total_size;
-
-	// Check if we would stay in the memory usage limits. We need to
-	// check also that the current usage is in the limits, because
-	// the application could have decreased the limit between calls
-	// to this function.
-	if (mem->limit < mem->used || mem->limit - mem->used < total_size) {
-		mem->limit_reached = true;
-		return NULL;
-	}
-
-	// Allocate separate memory chunks for lzma_memlimit_list and the
-	// actual requested memory. Optimizing this to use only one
-	// allocation is not a good idea, because applications may want to
-	// detach lzma_extra structures that have been allocated with
-	// lzma_memlimit_alloc().
-	lzma_memlimit_list *record = malloc(sizeof(lzma_memlimit_list));
-	void *ptr = malloc(size);
-
-	if (record == NULL || ptr == NULL) {
-		free(record);
-		free(ptr);
-		return NULL;
-	}
-
-	// Add the new entry to the beginning of the list. This should be
-	// more efficient when freeing memory, because usually it is
-	// "last allocated, first freed".
-	record->next = mem->list;
-	record->ptr = ptr;
-	record->size = total_size;
-
-	mem->list = record;
-	mem->used += total_size;
-
-	return ptr;
-}
-
-
-extern LZMA_API void
-lzma_memlimit_detach(lzma_memlimit *mem, void *ptr)
-{
-	if (ptr == NULL || mem->list == NULL)
-		return;
-
-	lzma_memlimit_list *record = mem->list;
-	lzma_memlimit_list *prev = NULL;
-
-	while (record->ptr != ptr) {
-		prev = record;
-		record = record->next;
-		if (record == NULL)
-			return;
-	}
-
-	if (prev != NULL)
-		prev->next = record->next;
-	else
-		mem->list = record->next;
-
-	assert(mem->used >= record->size);
-	mem->used -= record->size;
-
-	free(record);
-
-	return;
-}
-
-
-extern LZMA_API void
-lzma_memlimit_free(lzma_memlimit *mem, void *ptr)
-{
-	if (ptr == NULL)
-		return;
-
-	lzma_memlimit_detach(mem, ptr);
-
-	free(ptr);
-
-	return;
-}