ObjFW  Check-in [59f16e8a3d]

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Comment:Implementation for OFBigArray.
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SHA3-256: 59f16e8a3d010e4387800c45c029bc3b9da8002c808cd41097845ce92c22cfc9
User & Date: js on 2008-11-07 17:25:08
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Context
2008-11-07
20:25
Don't allocate 2 pages if we need exactly pagesize. check-in: 252ecc91a1 user: js tags: trunk
17:25
Implementation for OFBigArray. check-in: 59f16e8a3d user: js tags: trunk
14:29
Everything should be documented now. check-in: e8e45975df user: js tags: trunk
Changes
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Modified TODO from [e12a5a7d6a] to [1c6f68e944]. 

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Tests for OFFile.

OFArray
OFDirectory
OFDictionary
OFSortedArray
OFSocket
OFThread
OFAutoreleasePool

OFStack
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Modified src/OFArray.m from [97782e7ade] to [c474c9a944]. 

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/*
 * Copyright (c) 2008
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of libobjfw. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE included in
 * the packaging of this file.
 */

#import <stdio.h>
#import <string.h>
#import <unistd.h>

#import "OFArray.h"

#import "OFExceptions.h"
#import "OFMacros.h"

static size_t pagesize = 0;

@implementation OFArray
+ newWithItemSize: (size_t)is
{
	return [[OFArray alloc] initWithItemSize: is];
}
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- (void*)last
{
	return data + (items - 1) * itemsize;
}

- add: (void*)item
{
	if (SIZE_MAX - items < 1)
		[[OFOutOfRangeException newWithObject: self] raise];

	data = [self resizeMem: data
		      toNItems: items + 1
			ofSize: itemsize];

	memcpy(data + items++ * itemsize, item, itemsize);

	return self;
︙
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+ newWithItemSize: (size_t)is
{
	return [[OFBigArray alloc] initWithItemSize: is];
}

- initWithItemSize: (size_t)is
{
	if (pagesize == 0)
		pagesize = getpagesize();

	if ((self = [super init]))
	if ((self = [super initWithItemSize: is]))
		size = 0;

	return self;
}

- addNItems: (size_t)nitems
 fromCArray: (void*)carray
{
	size_t nsize;
	/* FIXME */
	OF_NOT_IMPLEMENTED(self)
}

	if (nitems > SIZE_MAX - items || items + nitems > SIZE_MAX / itemsize)
		[[OFOutOfRangeException newWithObject: self] raise];

	nsize = (((items + nitems) * itemsize) / pagesize) + 1;

	if (size != nsize)
		data = [self resizeMem: data
				toSize: nsize];

	memcpy(data + items * itemsize, carray, nitems * itemsize);
	items += nitems;
	size = nsize;

	return self;
}

- removeNItems: (size_t)nitems
{
	size_t nsize;
	/* FIXME */
	OF_NOT_IMPLEMENTED(self)
}

	if (nitems > items)
		[[OFOutOfRangeException newWithObject: self] raise];

	nsize = (((items - nitems) * itemsize) / pagesize) + 1;

	if (size != nsize)
		data = [self resizeMem: data
				toSize: nsize];

	items -= nitems;
	size = nsize;

	return self;
}
@end

Modified src/OFObject.m from [014c4c85fd] to [f326f71c26].

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		  ofSize: (size_t)size
{
	size_t memsize;
	
	if (nitems == 0 || size == 0)
		return NULL;

	if (size > SIZE_MAX / nitems)
	if (nitems > SIZE_MAX / size)
		[[OFOutOfRangeException newWithObject: self] raise];

	memsize = nitems * size;
	return [self getMemWithSize: memsize];
}

- (void*)resizeMem: (void*)ptr
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				      ofSize: size];
	
	if (nitems == 0 || size == 0) {
		[self freeMem: ptr];
		return NULL;
	}

	if (size > SIZE_MAX / nitems)
	if (nitems > SIZE_MAX / size)
		[[OFOutOfRangeException newWithObject: self] raise];

	memsize = nitems * size;
	return [self resizeMem: ptr
			toSize: memsize];
}
︙

Modified tests/OFArray/OFArray.m from [d6db94dbe6] to [ad07c5ffd2].

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	if (!caught) {					\
		puts("NOT CAUGHT!");			\
		return 1;				\
	}

const char *str = "Hallo!";

#define TEST(type) \
	puts("Trying to add too much to an array...");			\
	a = [type newWithItemSize: 4096];				\
	CATCH_EXCEPTION([a addNItems: SIZE_MAX				\
			  fromCArray: NULL],				\
	    OFOutOfRangeException)					\
									\
	puts("Trying to add something after that error...");		\
	p = [a getMemWithSize: 4096];					\
	memset(p, 255, 4096);						\
	[a add: p];							\
	if (!memcmp([a last], p, 4096))					\
		puts("[a last] matches with p!");			\
	else {								\
		puts("[a last] does not match p!");			\
		abort();						\
	}								\
	[a freeMem: p];							\
									\
	puts("Adding more data...");					\
	q = [a getMemWithSize: 4096];					\
	memset(q, 42, 4096);						\
	[a add: q];							\
	if (!memcmp([a last], q, 4096))					\
		puts("[a last] matches with q!");			\
	else {								\
		puts("[a last] does not match q!");			\
		abort();						\
	}								\
	[a freeMem: q];							\
									\
	puts("Adding multiple items at once...");			\
	p = [a getMemWithSize: 8192];					\
	memset(p, 64, 8192);						\
	[a addNItems: 2							\
	  fromCArray: p];						\
	if (!memcmp([a last], [a item: [a items] - 2], 4096) &&		\
	    !memcmp([a item: [a items] - 2], p, 4096))			\
		puts("[a last], [a item: [a items] - 2] and p match!");	\
	else {								\
		puts("[a last], [a item: [a items] - 2] and p did not match!");\
		abort();						\
	}								\
	[a freeMem: p];							\
									\
	i = [a items];							\
	puts("Removing 2 items...");					\
	[a removeNItems: 2];						\
	if ([a items] + 2 != i) {					\
		puts("[a items] + 2 != i!");				\
		abort();						\
	}								\
									\
	puts("Trying to remove more data than we added...");		\
	CATCH_EXCEPTION([a removeNItems: [a items] + 1],		\
	    OFOutOfRangeException);					\
									\
	puts("Trying to access an index that does not exist...");	\
	CATCH_EXCEPTION([a item: [a items]], OFOutOfRangeException);	\
									\
	[a free];							\
									\
	puts("Creating new array and using it to build a string...");	\
	a = [type newWithItemSize: 1];				\
									\
	for (i = 0; i < strlen(str); i++)				\
		[a add: (void*)(str + i)];				\
	[a add: ""];							\
									\
	if (!strcmp([a data], str))					\
		puts("Built string matches!");				\
	else {								\
		puts("Built string does not match!");			\
		abort();						\
	}								\
									\
	[a free];

int
main()
{
	BOOL caught;
	OFArray *a;
	id a;
	void *p, *q;
	size_t i;

	puts("Trying to add too much to an array...");
	a = [OFArray newWithItemSize: 4096];
	CATCH_EXCEPTION([a addNItems: SIZE_MAX
			  fromCArray: NULL],
	    OFOutOfRangeException)

	puts("== TESTING OFArray ==");
	puts("Trying to add something after that error...");
	p = [a getMemWithSize: 4096];
	memset(p, 255, 4096);
	[a add: p];
	if (!memcmp([a last], p, 4096))
		puts("[a last] matches with p!");
	else {
		puts("[a last] does not match p!");
		abort();
	}
	[a freeMem: p];

	puts("Adding more data...");
	q = [a getMemWithSize: 4096];
	memset(q, 42, 4096);
	[a add: q];
	if (!memcmp([a last], q, 4096))
		puts("[a last] matches with q!");
	else {
		puts("[a last] does not match q!");
		abort();
	}
	[a freeMem: q];

	puts("Adding multiple items at once...");
	p = [a getMemWithSize: 8192];
	memset(p, 64, 8192);
	[a addNItems: 2
	  fromCArray: p];
	TEST(OFArray)
	if (!memcmp([a last], [a item: [a items] - 2], 4096) &&
	    !memcmp([a item: [a items] - 2], p, 4096))
		puts("[a last], [a item: [a items] - 2] and p match!");
	else {
		puts("[a last], [a item: [a items] - 2] and p did not match!");
		abort();
	}

	[a freeMem: p];

	puts("== TESTING OFBigArray ==");
	i = [a items];
	puts("Removing 2 items...");
	[a removeNItems: 2];
	if ([a items] + 2 != i) {
		puts("[a items] + 2 != i!");
		abort();
	}

	TEST(OFBigArray)
	puts("Trying to remove more data than we added...");
	CATCH_EXCEPTION([a removeNItems: [a items] + 1], OFOutOfRangeException);

	puts("Trying to access an index that does not exist...");
	CATCH_EXCEPTION([a item: [a items]], OFOutOfRangeException);

	[a free];

	puts("Creating new array and using it to build a string...");
	a = [OFArray newWithItemSize: 1];

	for (i = 0; i < strlen(str); i++)
		[a add: (void*)(str + i)];
	[a add: ""];

	if (!strcmp([a data], str))
		puts("Built string matches!");
	else {
		puts("Built string does not match!");
		abort();
	}

	[a free];

	return 0;
}

Modified tests/OFObject/OFObject.m from [2848a193bd] to [49c951c9b1].

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	puts("Now trying to free them again...");
	CATCH_EXCEPTION([obj freeMem: p], OFMemNotPartOfObjException)
	CATCH_EXCEPTION([obj freeMem: q], OFMemNotPartOfObjException)
	CATCH_EXCEPTION([obj freeMem: r], OFMemNotPartOfObjException)
	puts("Got all 3!");
	
	puts("Trying to allocate more memory than possible...");
	CATCH_EXCEPTION(p = [obj getMemWithSize: 4294967295U], OFNoMemException)
	CATCH_EXCEPTION(p = [obj getMemWithSize: SIZE_MAX], OFNoMemException)

	puts("Allocating 1 byte...");
	p = [obj getMemWithSize: 1];

	puts("Trying to resize that 1 byte to more than possible...");
	CATCH_EXCEPTION(p = [obj resizeMem: p
				    toSize: 4294967295U],
				    toSize: SIZE_MAX],
	    OFNoMemException)

	puts("Trying to resize NULL to 1024 bytes...");
	p = [obj resizeMem: NULL
		    toSize: 1024];
	[obj freeMem: p];
	
	/* TODO: Test if freeing object frees all memory */

	return 0;
}

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