11 files changed, 0 insertions, 2154 deletions

diff --git a/lib/comp/block_processor.c b/lib/comp/block_processor.c
deleted file mode 100644
index 06dc384..0000000
--- a/lib/comp/block_processor.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * block_processor.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "block_processor.h"
-#include "util.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-struct block_processor_t {
-	size_t max_block_size;
-	compressor_t *cmp;
-	block_cb cb;
-	void *user;
-	int status;
-
-	uint8_t scratch[];
-};
-
-block_processor_t *block_processor_create(size_t max_block_size,
-					  compressor_t *cmp,
-					  unsigned int num_workers,
-					  void *user,
-					  block_cb callback)
-{
-	block_processor_t *proc = alloc_flex(sizeof(*proc), 1, max_block_size);
-	(void)num_workers;
-
-	if (proc == NULL) {
-		perror("Creating block processor");
-		return NULL;
-	}
-
-	proc->max_block_size = max_block_size;
-	proc->cmp = cmp;
-	proc->cb = callback;
-	proc->user = user;
-	return proc;
-}
-
-void block_processor_destroy(block_processor_t *proc)
-{
-	free(proc);
-}
-
-int block_processor_enqueue(block_processor_t *proc, block_t *block)
-{
-	if (process_block(block, proc->cmp,
-			  proc->scratch, proc->max_block_size))
-		goto fail;
-
-	if (proc->cb(proc->user, block))
-		goto fail;
-
-	free(block);
-	return 0;
-fail:
-	free(block);
-	proc->status = -1;
-	return -1;
-}
-
-int block_processor_finish(block_processor_t *proc)
-{
-	return proc->status;
-}
diff --git a/lib/comp/block_processor_parallel.c b/lib/comp/block_processor_parallel.c
deleted file mode 100644
index b58ad5c..0000000
--- a/lib/comp/block_processor_parallel.c
+++ /dev/null
@@ -1,340 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * block_processor.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "block_processor.h"
-#include "util.h"
-
-#include <pthread.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#define MAX_BACKLOG_FACTOR (10)
-
-typedef struct {
-	block_processor_t *shared;
-	compressor_t *cmp;
-	pthread_t thread;
-	uint8_t scratch[];
-} compress_worker_t;
-
-struct block_processor_t {
-	pthread_mutex_t mtx;
-	pthread_cond_t queue_cond;
-	pthread_cond_t done_cond;
-
-	/* needs rw access by worker and main thread */
-	block_t *queue;
-	block_t *queue_last;
-
-	block_t *done;
-	bool terminate;
-	size_t backlog;
-
-	/* used by main thread only */
-	uint32_t enqueue_id;
-	uint32_t dequeue_id;
-
-	unsigned int num_workers;
-	block_cb cb;
-	void *user;
-	int status;
-
-	/* used only by workers */
-	size_t max_block_size;
-
-	compress_worker_t *workers[];
-};
-
-static void store_completed_block(block_processor_t *shared, block_t *blk)
-{
-	block_t *it = shared->done, *prev = NULL;
-
-	while (it != NULL) {
-		if (it->sequence_number >= blk->sequence_number)
-			break;
-		prev = it;
-		it = it->next;
-	}
-
-	if (prev == NULL) {
-		blk->next = shared->done;
-		shared->done = blk;
-	} else {
-		blk->next = prev->next;
-		prev->next = blk;
-	}
-}
-
-static void *worker_proc(void *arg)
-{
-	compress_worker_t *worker = arg;
-	block_processor_t *shared = worker->shared;
-	block_t *blk = NULL;
-
-	for (;;) {
-		pthread_mutex_lock(&shared->mtx);
-		if (blk != NULL) {
-			store_completed_block(shared, blk);
-			shared->backlog -= 1;
-			pthread_cond_broadcast(&shared->done_cond);
-		}
-
-		while (shared->queue == NULL && !shared->terminate) {
-			pthread_cond_wait(&shared->queue_cond,
-					  &shared->mtx);
-		}
-
-		if (shared->terminate) {
-			pthread_mutex_unlock(&shared->mtx);
-			break;
-		}
-
-		blk = shared->queue;
-		shared->queue = blk->next;
-		blk->next = NULL;
-
-		if (shared->queue == NULL)
-			shared->queue_last = NULL;
-		pthread_mutex_unlock(&shared->mtx);
-
-		if (process_block(blk, worker->cmp, worker->scratch,
-				  shared->max_block_size)) {
-			blk->flags |= BLK_COMPRESS_ERROR;
-		}
-	}
-	return NULL;
-}
-
-block_processor_t *block_processor_create(size_t max_block_size,
-					  compressor_t *cmp,
-					  unsigned int num_workers,
-					  void *user,
-					  block_cb callback)
-{
-	block_processor_t *proc;
-	unsigned int i;
-	int ret;
-
-	if (num_workers < 1)
-		num_workers = 1;
-
-	proc = alloc_flex(sizeof(*proc),
-			  sizeof(proc->workers[0]), num_workers);
-	if (proc == NULL) {
-		perror("Creating block processor");
-		return NULL;
-	}
-
-	proc->max_block_size = max_block_size;
-	proc->cb = callback;
-	proc->user = user;
-	proc->num_workers = num_workers;
-
-	if (pthread_mutex_init(&proc->mtx, NULL)) {
-		perror("Creating block processor mutex");
-		goto fail_free;
-	}
-
-	if (pthread_cond_init(&proc->queue_cond, NULL)) {
-		perror("Creating block processor conditional");
-		goto fail_mtx;
-	}
-
-	if (pthread_cond_init(&proc->done_cond, NULL)) {
-		perror("Creating block processor completion conditional");
-		goto fail_cond;
-	}
-
-	for (i = 0; i < num_workers; ++i) {
-		proc->workers[i] = alloc_flex(sizeof(compress_worker_t),
-					      1, max_block_size);
-
-		if (proc->workers[i] == NULL) {
-			perror("Creating block worker data");
-			goto fail_init;
-		}
-
-		proc->workers[i]->shared = proc;
-		proc->workers[i]->cmp = cmp->create_copy(cmp);
-
-		if (proc->workers[i]->cmp == NULL)
-			goto fail_init;
-	}
-
-	for (i = 0; i < num_workers; ++i) {
-		ret = pthread_create(&proc->workers[i]->thread, NULL,
-				     worker_proc, proc->workers[i]);
-
-		if (ret != 0) {
-			perror("Creating block processor thread");
-			goto fail_thread;
-		}
-	}
-
-	return proc;
-fail_thread:
-	pthread_mutex_lock(&proc->mtx);
-	proc->terminate = true;
-	pthread_cond_broadcast(&proc->queue_cond);
-	pthread_mutex_unlock(&proc->mtx);
-
-	for (i = 0; i < num_workers; ++i) {
-		if (proc->workers[i]->thread > 0) {
-			pthread_join(proc->workers[i]->thread, NULL);
-		}
-	}
-fail_init:
-	for (i = 0; i < num_workers; ++i) {
-		if (proc->workers[i] != NULL) {
-			if (proc->workers[i]->cmp != NULL) {
-				proc->workers[i]->cmp->
-					destroy(proc->workers[i]->cmp);
-			}
-
-			free(proc->workers[i]);
-		}
-	}
-	pthread_cond_destroy(&proc->done_cond);
-fail_cond:
-	pthread_cond_destroy(&proc->queue_cond);
-fail_mtx:
-	pthread_mutex_destroy(&proc->mtx);
-fail_free:
-	free(proc);
-	return NULL;
-}
-
-void block_processor_destroy(block_processor_t *proc)
-{
-	unsigned int i;
-	block_t *blk;
-
-	pthread_mutex_lock(&proc->mtx);
-	proc->terminate = true;
-	pthread_cond_broadcast(&proc->queue_cond);
-	pthread_mutex_unlock(&proc->mtx);
-
-	for (i = 0; i < proc->num_workers; ++i) {
-		pthread_join(proc->workers[i]->thread, NULL);
-
-		proc->workers[i]->cmp->destroy(proc->workers[i]->cmp);
-		free(proc->workers[i]);
-	}
-
-	pthread_cond_destroy(&proc->done_cond);
-	pthread_cond_destroy(&proc->queue_cond);
-	pthread_mutex_destroy(&proc->mtx);
-
-	while (proc->queue != NULL) {
-		blk = proc->queue;
-		proc->queue = blk->next;
-		free(blk);
-	}
-
-	while (proc->done != NULL) {
-		blk = proc->done;
-		proc->done = blk->next;
-		free(blk);
-	}
-
-	free(proc);
-}
-
-static int process_completed_blocks(block_processor_t *proc, block_t *queue)
-{
-	block_t *it;
-
-	while (queue != NULL) {
-		it = queue;
-		queue = queue->next;
-
-		if (it->flags & BLK_COMPRESS_ERROR) {
-			proc->status = -1;
-		} else {
-			if (proc->cb(proc->user, it))
-				proc->status = -1;
-		}
-
-		free(it);
-	}
-
-	return proc->status;
-}
-
-int block_processor_enqueue(block_processor_t *proc, block_t *block)
-{
-	block_t *queue = NULL, *it, *prev;
-
-	block->sequence_number = proc->enqueue_id++;
-	block->next = NULL;
-
-	pthread_mutex_lock(&proc->mtx);
-	if ((block->flags & BLK_DONT_COMPRESS) &&
-	    (block->flags & BLK_DONT_CHECKSUM)) {
-		store_completed_block(proc, block);
-	} else {
-		while (proc->backlog > proc->num_workers * MAX_BACKLOG_FACTOR)
-			pthread_cond_wait(&proc->done_cond, &proc->mtx);
-
-		if (proc->queue_last == NULL) {
-			proc->queue = proc->queue_last = block;
-		} else {
-			proc->queue_last->next = block;
-			proc->queue_last = block;
-		}
-
-		proc->backlog += 1;
-	}
-
-	it = proc->done;
-	prev = NULL;
-
-	while (it != NULL && it->sequence_number == proc->dequeue_id) {
-		prev = it;
-		it = it->next;
-		proc->dequeue_id += 1;
-	}
-
-	if (prev != NULL) {
-		queue = proc->done;
-		prev->next = NULL;
-		proc->done = it;
-	}
-
-	pthread_cond_broadcast(&proc->queue_cond);
-	pthread_mutex_unlock(&proc->mtx);
-
-	return process_completed_blocks(proc, queue);
-}
-
-int block_processor_finish(block_processor_t *proc)
-{
-	block_t *queue, *it;
-
-	pthread_mutex_lock(&proc->mtx);
-	while (proc->backlog > 0)
-		pthread_cond_wait(&proc->done_cond, &proc->mtx);
-
-	for (it = proc->done; it != NULL; it = it->next) {
-		if (it->sequence_number != proc->dequeue_id++) {
-			pthread_mutex_unlock(&proc->mtx);
-			goto bug_seqnum;
-		}
-	}
-
-	queue = proc->done;
-	proc->done = NULL;
-	pthread_mutex_unlock(&proc->mtx);
-
-	return process_completed_blocks(proc, queue);
-bug_seqnum:
-	fputs("[BUG][parallel block processor] "
-	      "gap in sequence numbers!\n", stderr);
-	return -1;
-}
diff --git a/lib/comp/compressor.c b/lib/comp/compressor.c
deleted file mode 100644
index e59d948..0000000
--- a/lib/comp/compressor.c
+++ /dev/null
@@ -1,183 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * compressor.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "internal.h"
-#include "util.h"
-
-typedef compressor_t *(*compressor_fun_t)(bool compress, size_t block_size,
-					  char *options);
-
-typedef void (*compressor_help_fun_t)(void);
-
-static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
-#ifdef WITH_GZIP
-	[SQFS_COMP_GZIP] = create_gzip_compressor,
-#endif
-#ifdef WITH_XZ
-	[SQFS_COMP_XZ] = create_xz_compressor,
-#endif
-#ifdef WITH_LZO
-	[SQFS_COMP_LZO] = create_lzo_compressor,
-#endif
-#ifdef WITH_LZ4
-	[SQFS_COMP_LZ4] = create_lz4_compressor,
-#endif
-#ifdef WITH_ZSTD
-	[SQFS_COMP_ZSTD] = create_zstd_compressor,
-#endif
-};
-
-static const compressor_help_fun_t helpfuns[SQFS_COMP_MAX + 1] = {
-#ifdef WITH_GZIP
-	[SQFS_COMP_GZIP] = compressor_gzip_print_help,
-#endif
-#ifdef WITH_XZ
-	[SQFS_COMP_XZ] = compressor_xz_print_help,
-#endif
-#ifdef WITH_LZO
-	[SQFS_COMP_LZO] = compressor_lzo_print_help,
-#endif
-#ifdef WITH_LZ4
-	[SQFS_COMP_LZ4] = compressor_lz4_print_help,
-#endif
-#ifdef WITH_ZSTD
-	[SQFS_COMP_ZSTD] = compressor_zstd_print_help,
-#endif
-};
-
-static const char *names[] = {
-	[SQFS_COMP_GZIP] = "gzip",
-	[SQFS_COMP_LZMA] = "lzma",
-	[SQFS_COMP_LZO] = "lzo",
-	[SQFS_COMP_XZ] = "xz",
-	[SQFS_COMP_LZ4] = "lz4",
-	[SQFS_COMP_ZSTD] = "zstd",
-};
-
-int generic_write_options(int fd, const void *data, size_t size)
-{
-	uint8_t buffer[size + 2];
-
-	*((uint16_t *)buffer) = htole16(0x8000 | size);
-	memcpy(buffer + 2, data, size);
-
-	if (write_data("writing compressor options",
-		       fd, buffer, sizeof(buffer))) {
-		return -1;
-	}
-
-	return sizeof(buffer);
-}
-
-int generic_read_options(int fd, void *data, size_t size)
-{
-	uint8_t buffer[size + 2];
-
-	if (read_data_at("reading compressor options", sizeof(sqfs_super_t),
-			 fd, buffer, sizeof(buffer))) {
-		return -1;
-	}
-
-	if (le16toh(*((uint16_t *)buffer)) != (0x8000 | size)) {
-		fputs("reading compressor options: invalid meta data header\n",
-		      stderr);
-		return -1;
-	}
-
-	memcpy(data, buffer + 2, size);
-	return 0;
-}
-
-bool compressor_exists(E_SQFS_COMPRESSOR id)
-{
-	if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
-		return false;
-
-	return (compressors[id] != NULL);
-}
-
-compressor_t *compressor_create(E_SQFS_COMPRESSOR id, bool compress,
-				size_t block_size, char *options)
-{
-	if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
-		return NULL;
-
-	if (compressors[id] == NULL)
-		return NULL;
-
-	return compressors[id](compress, block_size, options);
-}
-
-void compressor_print_help(E_SQFS_COMPRESSOR id)
-{
-	if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
-		return;
-
-	if (compressors[id] == NULL)
-		return;
-
-	helpfuns[id]();
-}
-
-void compressor_print_available(void)
-{
-	size_t i;
-
-	fputs("Available compressors:\n", stdout);
-
-	for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
-		if (compressor_exists(i))
-			printf("\t%s\n", names[i]);
-	}
-
-	printf("\nDefault compressor: %s\n", names[compressor_get_default()]);
-}
-
-const char *compressor_name_from_id(E_SQFS_COMPRESSOR id)
-{
-	if (id < 0 || (size_t)id >= sizeof(names) / sizeof(names[0]))
-		return NULL;
-
-	return names[id];
-}
-
-int compressor_id_from_name(const char *name, E_SQFS_COMPRESSOR *out)
-{
-	size_t i;
-
-	for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
-		if (names[i] != NULL && strcmp(names[i], name) == 0) {
-			*out = i;
-			return 0;
-		}
-	}
-
-	return -1;
-}
-
-E_SQFS_COMPRESSOR compressor_get_default(void)
-{
-#if defined(WITH_XZ)
-	return SQFS_COMP_XZ;
-#elif defined(WITH_ZSTD)
-	return SQFS_COMP_ZSTD;
-#elif defined(WITH_GZIP)
-	return SQFS_COMP_GZIP;
-#elif defined(WITH_LZO)
-	return SQFS_COMP_LZO;
-#elif defined(WITH_LZ4)
-	return SQFS_COMP_LZ4;
-#else
-	fputs("No compressor implementation available!\n", stderr);
-	exit(EXIT_FAILURE);
-#endif
-}
diff --git a/lib/comp/create_block.c b/lib/comp/create_block.c
deleted file mode 100644
index 90344bb..0000000
--- a/lib/comp/create_block.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * create_block.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "block_processor.h"
-#include "util.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-block_t *create_block(const char *filename, int fd, size_t size,
-		      void *user, uint32_t flags)
-{
-	block_t *blk = alloc_flex(sizeof(*blk), 1, size);
-
-	if (blk == NULL) {
-		perror(filename);
-		return NULL;
-	}
-
-	if (fd >= 0) {
-		if (read_data(filename, fd, blk->data, size)) {
-			free(blk);
-			return NULL;
-		}
-	}
-
-	blk->size = size;
-	blk->user = user;
-	blk->flags = flags;
-	return blk;
-}
diff --git a/lib/comp/gzip.c b/lib/comp/gzip.c
deleted file mode 100644
index 1fdc051..0000000
--- a/lib/comp/gzip.c
+++ /dev/null
@@ -1,412 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * gzip.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <zlib.h>
-
-#include "internal.h"
-
-#define GZIP_DEFAULT_LEVEL 9
-#define GZIP_DEFAULT_WINDOW 15
-#define GZIP_NUM_STRATEGIES (sizeof(strategies) / sizeof(strategies[0]))
-
-typedef enum {
-	GZIP_STRATEGY_DEFAULT = 0x01,
-	GZIP_STRATEGY_FILTERED = 0x02,
-	GZIP_STRATEGY_HUFFMAN = 0x04,
-	GZIP_STARTEGY_RLE = 0x08,
-	GZIP_STRATEGY_FIXED = 0x10,
-
-	GZIP_ALL_STRATEGIES = 0x1F,
-} GZIP_STRATEGIES;
-
-static const struct {
-	const char *name;
-	int flag;
-	int zlib;
-} strategies[] = {
-	{ "default", GZIP_STRATEGY_DEFAULT, Z_DEFAULT_STRATEGY },
-	{ "filtered", GZIP_STRATEGY_FILTERED, Z_FILTERED },
-	{ "huffman", GZIP_STRATEGY_HUFFMAN, Z_HUFFMAN_ONLY },
-	{ "rle", GZIP_STARTEGY_RLE, Z_RLE },
-	{ "fixed", GZIP_STRATEGY_FIXED, Z_FIXED },
-};
-
-typedef struct {
-	uint32_t level;
-	uint16_t window;
-	uint16_t strategies;
-} gzip_options_t;
-
-typedef struct {
-	compressor_t base;
-
-	z_stream strm;
-	bool compress;
-
-	size_t block_size;
-	gzip_options_t opt;
-} gzip_compressor_t;
-
-static void gzip_destroy(compressor_t *base)
-{
-	gzip_compressor_t *gzip = (gzip_compressor_t *)base;
-
-	if (gzip->compress) {
-		deflateEnd(&gzip->strm);
-	} else {
-		inflateEnd(&gzip->strm);
-	}
-
-	free(gzip);
-}
-
-static int gzip_write_options(compressor_t *base, int fd)
-{
-	gzip_compressor_t *gzip = (gzip_compressor_t *)base;
-	gzip_options_t opt;
-
-	if (gzip->opt.level == GZIP_DEFAULT_LEVEL &&
-	    gzip->opt.window == GZIP_DEFAULT_WINDOW &&
-	    gzip->opt.strategies == 0) {
-		return 0;
-	}
-
-	opt.level = htole32(gzip->opt.level);
-	opt.window = htole16(gzip->opt.window);
-	opt.strategies = htole16(gzip->opt.strategies);
-
-	return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int gzip_read_options(compressor_t *base, int fd)
-{
-	gzip_compressor_t *gzip = (gzip_compressor_t *)base;
-	gzip_options_t opt;
-
-	if (generic_read_options(fd, &opt, sizeof(opt)))
-		return -1;
-
-	gzip->opt.level = le32toh(opt.level);
-	gzip->opt.window = le16toh(opt.window);
-	gzip->opt.strategies = le16toh(opt.strategies);
-
-	if (gzip->opt.level < 1 || gzip->opt.level > 9) {
-		fprintf(stderr, "Invalid gzip compression level '%d'.\n",
-			gzip->opt.level);
-		return -1;
-	}
-
-	if (gzip->opt.window < 8 || gzip->opt.window > 15) {
-		fprintf(stderr, "Invalid gzip window size '%d'.\n",
-			gzip->opt.window);
-		return -1;
-	}
-
-	if (gzip->opt.strategies & ~GZIP_ALL_STRATEGIES) {
-		fputs("Unknown gzip strategies selected.\n", stderr);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int find_strategy(gzip_compressor_t *gzip, const uint8_t *in,
-			 size_t size, uint8_t *out, size_t outsize)
-{
-	int ret, selected = Z_DEFAULT_STRATEGY;
-	size_t i, length, minlength = 0;
-
-	for (i = 0; i < GZIP_NUM_STRATEGIES; ++i) {
-		if (!(strategies[i].flag & gzip->opt.strategies))
-			continue;
-
-		ret = deflateReset(&gzip->strm);
-		if (ret != Z_OK) {
-			fputs("resetting zlib stream failed\n",
-			      stderr);
-			return -1;
-		}
-
-		gzip->strm.next_in = (void *)in;
-		gzip->strm.avail_in = size;
-		gzip->strm.next_out = out;
-		gzip->strm.avail_out = outsize;
-
-		ret = deflateParams(&gzip->strm, gzip->opt.level,
-				    strategies[i].zlib);
-		if (ret != Z_OK) {
-			fputs("setting deflate parameters failed\n",
-			      stderr);
-			return -1;
-		}
-
-		ret = deflate(&gzip->strm, Z_FINISH);
-
-		if (ret == Z_STREAM_END) {
-			length = gzip->strm.total_out;
-
-			if (minlength == 0 || length < minlength) {
-				minlength = length;
-				selected = strategies[i].zlib;
-			}
-		} else if (ret != Z_OK && ret != Z_BUF_ERROR) {
-			fputs("gzip block processing failed\n", stderr);
-			return -1;
-		}
-	}
-
-	return selected;
-}
-
-static ssize_t gzip_do_block(compressor_t *base, const uint8_t *in,
-			     size_t size, uint8_t *out, size_t outsize)
-{
-	gzip_compressor_t *gzip = (gzip_compressor_t *)base;
-	int ret, strategy = 0;
-	size_t written;
-
-	if (gzip->compress && gzip->opt.strategies != 0) {
-		strategy = find_strategy(gzip, in, size, out, outsize);
-		if (strategy < 0)
-			return -1;
-	}
-
-	if (gzip->compress) {
-		ret = deflateReset(&gzip->strm);
-	} else {
-		ret = inflateReset(&gzip->strm);
-	}
-
-	if (ret != Z_OK) {
-		fputs("resetting zlib stream failed\n", stderr);
-		return -1;
-	}
-
-	gzip->strm.next_in = (void *)in;
-	gzip->strm.avail_in = size;
-	gzip->strm.next_out = out;
-	gzip->strm.avail_out = outsize;
-
-	if (gzip->compress && gzip->opt.strategies != 0) {
-		ret = deflateParams(&gzip->strm, gzip->opt.level, strategy);
-		if (ret != Z_OK) {
-			fputs("setting selcted deflate parameters failed\n",
-			      stderr);
-			return -1;
-		}
-	}
-
-	if (gzip->compress) {
-		ret = deflate(&gzip->strm, Z_FINISH);
-	} else {
-		ret = inflate(&gzip->strm, Z_FINISH);
-	}
-
-	if (ret == Z_STREAM_END) {
-		written = gzip->strm.total_out;
-
-		if (gzip->compress && written >= size)
-			return 0;
-
-		return (ssize_t)written;
-	}
-
-	if (ret != Z_OK && ret != Z_BUF_ERROR) {
-		fputs("gzip block processing failed\n", stderr);
-		return -1;
-	}
-
-	return 0;
-}
-
-static int process_options(char *options, int *level, int *window, int *flags)
-{
-	enum {
-		OPT_WINDOW = 0,
-		OPT_LEVEL,
-	};
-	char *const token[] = {
-		[OPT_WINDOW] = (char *)"window",
-		[OPT_LEVEL] = (char *)"level",
-		NULL
-	};
-	char *subopts, *value;
-	size_t i;
-	int opt;
-
-	subopts = options;
-
-	while (*subopts != '\0') {
-		opt = getsubopt(&subopts, token, &value);
-
-		switch (opt) {
-		case OPT_WINDOW:
-			if (value == NULL)
-				goto fail_value;
-
-			for (i = 0; isdigit(value[i]); ++i)
-				;
-
-			if (i < 1 || i > 3 || value[i] != '\0')
-				goto fail_window;
-
-			*window = atoi(value);
-
-			if (*window < 8 || *window > 15)
-				goto fail_window;
-			break;
-		case OPT_LEVEL:
-			if (value == NULL)
-				goto fail_value;
-
-			for (i = 0; isdigit(value[i]); ++i)
-				;
-
-			if (i < 1 || i > 3 || value[i] != '\0')
-				goto fail_level;
-
-			*level = atoi(value);
-
-			if (*level < 1 || *level > 9)
-				goto fail_level;
-			break;
-		default:
-			for (i = 0; i < GZIP_NUM_STRATEGIES; ++i) {
-				if (strcmp(value, strategies[i].name) == 0) {
-					*flags |= strategies[i].flag;
-					break;
-				}
-			}
-			if (i == GZIP_NUM_STRATEGIES)
-				goto fail_opt;
-			break;
-		}
-	}
-
-	return 0;
-fail_window:
-	fputs("Window size must be a number between 8 and 15.\n", stderr);
-	return -1;
-fail_level:
-	fputs("Compression level must be a number between 1 and 9.\n", stderr);
-	return -1;
-fail_opt:
-	fprintf(stderr, "Unknown option '%s'.\n", value);
-	return -1;
-fail_value:
-	fprintf(stderr, "Missing value for '%s'.\n", token[opt]);
-	return -1;
-}
-
-static compressor_t *gzip_create_copy(compressor_t *cmp)
-{
-	gzip_compressor_t *gzip = malloc(sizeof(*gzip));
-	int ret;
-
-	if (gzip == NULL) {
-		perror("creating additional gzip compressor");
-		return NULL;
-	}
-
-	memcpy(gzip, cmp, sizeof(*gzip));
-	memset(&gzip->strm, 0, sizeof(gzip->strm));
-
-	if (gzip->compress) {
-		ret = deflateInit2(&gzip->strm, gzip->opt.level, Z_DEFLATED,
-				   gzip->opt.window, 8, Z_DEFAULT_STRATEGY);
-	} else {
-		ret = inflateInit(&gzip->strm);
-	}
-
-	if (ret != Z_OK) {
-		fputs("internal error creating additional zlib stream\n",
-		      stderr);
-		free(gzip);
-		return NULL;
-	}
-
-	return (compressor_t *)gzip;
-}
-
-compressor_t *create_gzip_compressor(bool compress, size_t block_size,
-				     char *options)
-{
-	int window = GZIP_DEFAULT_WINDOW;
-	int level = GZIP_DEFAULT_LEVEL;
-	gzip_compressor_t *gzip;
-	compressor_t *base;
-	int flags = 0;
-	int ret;
-
-	if (options != NULL) {
-		if (process_options(options, &level, &window, &flags))
-			return NULL;
-	}
-
-	gzip = calloc(1, sizeof(*gzip));
-	base = (compressor_t *)gzip;
-
-	if (gzip == NULL) {
-		perror("creating gzip compressor");
-		return NULL;
-	}
-
-	gzip->opt.level = level;
-	gzip->opt.window = window;
-	gzip->opt.strategies = flags;
-	gzip->compress = compress;
-	gzip->block_size = block_size;
-	base->do_block = gzip_do_block;
-	base->destroy = gzip_destroy;
-	base->write_options = gzip_write_options;
-	base->read_options = gzip_read_options;
-	base->create_copy = gzip_create_copy;
-
-	if (compress) {
-		ret = deflateInit2(&gzip->strm, level, Z_DEFLATED, window, 8,
-				   Z_DEFAULT_STRATEGY);
-	} else {
-		ret = inflateInit(&gzip->strm);
-	}
-
-	if (ret != Z_OK) {
-		fputs("internal error creating zlib stream\n", stderr);
-		free(gzip);
-		return NULL;
-	}
-
-	return base;
-}
-
-void compressor_gzip_print_help(void)
-{
-	size_t i;
-
-	printf(
-"Available options for gzip compressor:\n"
-"\n"
-"    level=<value>    Compression level. Value from 1 to 9.\n"
-"                     Defaults to %d.\n"
-"    window=<size>    Deflate compression window size. Value from 8 to 15.\n"
-"                     Defaults to %d.\n"
-"\n"
-"In additon to the options, one or more strategies can be specified.\n"
-"If multiple stratgies are provided, the one yielding the best compression\n"
-"ratio will be used.\n"
-"\n"
-"The following strategies are available:\n",
-	GZIP_DEFAULT_LEVEL, GZIP_DEFAULT_WINDOW);
-
-	for (i = 0; i < GZIP_NUM_STRATEGIES; ++i)
-		printf("\t%s\n", strategies[i].name);
-}
diff --git a/lib/comp/internal.h b/lib/comp/internal.h
deleted file mode 100644
index 986266d..0000000
--- a/lib/comp/internal.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * internal.h
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#ifndef INTERNAL_H
-#define INTERNAL_H
-
-#include "config.h"
-
-#include "compress.h"
-#include "util.h"
-
-int generic_write_options(int fd, const void *data, size_t size);
-
-int generic_read_options(int fd, void *data, size_t size);
-
-compressor_t *create_xz_compressor(bool compress, size_t block_size,
-				   char *options);
-
-compressor_t *create_gzip_compressor(bool compress, size_t block_size,
-				     char *options);
-
-compressor_t *create_lzo_compressor(bool compress, size_t block_size,
-				    char *options);
-
-compressor_t *create_lz4_compressor(bool compress, size_t block_size,
-				    char *options);
-
-compressor_t *create_zstd_compressor(bool compress, size_t block_size,
-				     char *options);
-
-void compressor_xz_print_help(void);
-
-void compressor_gzip_print_help(void);
-
-void compressor_lzo_print_help(void);
-
-void compressor_lz4_print_help(void);
-
-void compressor_zstd_print_help(void);
-
-#endif /* INTERNAL_H */
diff --git a/lib/comp/lz4.c b/lib/comp/lz4.c
deleted file mode 100644
index abb6c5c..0000000
--- a/lib/comp/lz4.c
+++ /dev/null
@@ -1,159 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * lz4.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-#include <lz4.h>
-#include <lz4hc.h>
-
-#include "internal.h"
-
-typedef struct {
-	compressor_t base;
-	bool high_compression;
-} lz4_compressor_t;
-
-typedef struct {
-	uint32_t version;
-	uint32_t flags;
-} lz4_options;
-
-#define LZ4LEGACY 1
-#define LZ4_FLAG_HC 0x01
-
-static int lz4_write_options(compressor_t *base, int fd)
-{
-	lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
-	lz4_options opt = {
-		.version = htole32(LZ4LEGACY),
-		.flags = htole32(lz4->high_compression ? LZ4_FLAG_HC : 0),
-	};
-
-	return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int lz4_read_options(compressor_t *base, int fd)
-{
-	lz4_options opt;
-	(void)base;
-
-	if (generic_read_options(fd, &opt, sizeof(opt)))
-		return -1;
-
-	opt.version = le32toh(opt.version);
-	opt.flags = le32toh(opt.flags);
-
-	if (opt.version != LZ4LEGACY) {
-		fprintf(stderr, "unsupported lz4 version '%d'\n", opt.version);
-		return -1;
-	}
-
-	return 0;
-}
-
-static ssize_t lz4_comp_block(compressor_t *base, const uint8_t *in,
-			      size_t size, uint8_t *out, size_t outsize)
-{
-	lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
-	int ret;
-
-	if (lz4->high_compression) {
-		ret = LZ4_compress_HC((void *)in, (void *)out,
-				      size, outsize, LZ4HC_CLEVEL_MAX);
-	} else {
-		ret = LZ4_compress_default((void *)in, (void *)out,
-					   size, outsize);
-	}
-
-	if (ret < 0) {
-		fputs("internal error in lz4 compressor\n", stderr);
-		return -1;
-	}
-
-	return ret;
-}
-
-static ssize_t lz4_uncomp_block(compressor_t *base, const uint8_t *in,
-				size_t size, uint8_t *out, size_t outsize)
-{
-	int ret;
-	(void)base;
-
-	ret = LZ4_decompress_safe((void *)in, (void *)out, size, outsize);
-
-	if (ret < 0) {
-		fputs("internal error in lz4 decompressor\n", stderr);
-		return -1;
-	}
-
-	return ret;
-}
-
-static compressor_t *lz4_create_copy(compressor_t *cmp)
-{
-	lz4_compressor_t *lz4 = malloc(sizeof(*lz4));
-
-	if (lz4 == NULL) {
-		perror("creating additional lz4 compressor");
-		return NULL;
-	}
-
-	memcpy(lz4, cmp, sizeof(*lz4));
-	return (compressor_t *)lz4;
-}
-
-static void lz4_destroy(compressor_t *base)
-{
-	free(base);
-}
-
-compressor_t *create_lz4_compressor(bool compress, size_t block_size,
-				    char *options)
-{
-	lz4_compressor_t *lz4 = calloc(1, sizeof(*lz4));
-	compressor_t *base = (compressor_t *)lz4;
-	(void)block_size;
-
-	if (lz4 == NULL) {
-		perror("creating lz4 compressor");
-		return NULL;
-	}
-
-	lz4->high_compression = false;
-
-	if (options != NULL) {
-		if (strcmp(options, "hc") == 0) {
-			lz4->high_compression = true;
-		} else {
-			fputs("Unsupported extra options for lz4 "
-			      "compressor.\n", stderr);
-			free(lz4);
-			return NULL;
-		}
-	}
-
-	base->destroy = lz4_destroy;
-	base->do_block = compress ? lz4_comp_block : lz4_uncomp_block;
-	base->write_options = lz4_write_options;
-	base->read_options = lz4_read_options;
-	base->create_copy = lz4_create_copy;
-	return base;
-}
-
-void compressor_lz4_print_help(void)
-{
-	fputs("Available options for lz4 compressor:\n"
-	      "\n"
-	      "    hc    If present, use slower but better compressing\n"
-	      "          variant of lz4.\n"
-	      "\n",
-	      stdout);
-}
diff --git a/lib/comp/lzo.c b/lib/comp/lzo.c
deleted file mode 100644
index 09ef75c..0000000
--- a/lib/comp/lzo.c
+++ /dev/null
@@ -1,321 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * lzo.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <ctype.h>
-
-#include <lzo/lzo1x.h>
-
-#include "internal.h"
-
-
-typedef enum {
-	LZO_ALGORITHM_LZO1X_1 = 0,
-	LZO_ALGORITHM_LZO1X_1_11 = 1,
-	LZO_ALGORITHM_LZO1X_1_12 = 2,
-	LZO_ALGORITHM_LZO1X_1_15 = 3,
-	LZO_ALGORITHM_LZO1X_999	= 4,
-} LZO_ALGORITHM;
-
-#define LZO_DEFAULT_ALG LZO_ALGORITHM_LZO1X_999
-#define LZO_DEFAULT_LEVEL 8
-#define LZO_NUM_ALGS (sizeof(lzo_algs) / sizeof(lzo_algs[0]))
-
-typedef int (*lzo_cb_t)(const lzo_bytep src, lzo_uint src_len, lzo_bytep dst,
-			lzo_uintp dst_len, lzo_voidp wrkmem);
-
-static const struct {
-	const char *name;
-	lzo_cb_t compress;
-	size_t bufsize;
-} lzo_algs[] = {
-	[LZO_ALGORITHM_LZO1X_1] = {
-		.name = "lzo1x_1",
-		.compress = lzo1x_1_compress,
-		.bufsize = LZO1X_1_MEM_COMPRESS,
-	},
-	[LZO_ALGORITHM_LZO1X_1_11] = {
-		.name = "lzo1x_1_11",
-		.compress = lzo1x_1_11_compress,
-		.bufsize = LZO1X_1_11_MEM_COMPRESS,
-	},
-	[LZO_ALGORITHM_LZO1X_1_12] = {
-		.name = "lzo1x_1_12",
-		.compress = lzo1x_1_12_compress,
-		.bufsize = LZO1X_1_12_MEM_COMPRESS,
-	},
-	[LZO_ALGORITHM_LZO1X_1_15] = {
-		.name = "lzo1x_1_15",
-		.compress = lzo1x_1_15_compress,
-		.bufsize = LZO1X_1_15_MEM_COMPRESS,
-	},
-	[LZO_ALGORITHM_LZO1X_999] = {
-		.name = "lzo1x_999",
-		.compress = lzo1x_999_compress,
-		.bufsize = LZO1X_999_MEM_COMPRESS,
-	},
-};
-
-typedef struct {
-	compressor_t base;
-	int algorithm;
-	int level;
-
-	uint8_t buffer[];
-} lzo_compressor_t;
-
-typedef struct {
-	uint32_t algorithm;
-	uint32_t level;
-} lzo_options_t;
-
-static int lzo_write_options(compressor_t *base, int fd)
-{
-	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
-	lzo_options_t opt;
-
-	if (lzo->algorithm == LZO_DEFAULT_ALG &&
-	    lzo->level == LZO_DEFAULT_LEVEL) {
-		return 0;
-	}
-
-	opt.algorithm = htole32(lzo->algorithm);
-
-	if (lzo->algorithm == LZO_ALGORITHM_LZO1X_999) {
-		opt.level = htole32(lzo->level);
-	} else {
-		opt.level = 0;
-	}
-
-	return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int lzo_read_options(compressor_t *base, int fd)
-{
-	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
-	lzo_options_t opt;
-
-	if (generic_read_options(fd, &opt, sizeof(opt)))
-		return -1;
-
-	lzo->algorithm = le32toh(opt.algorithm);
-	lzo->level = le32toh(opt.level);
-
-	switch(lzo->algorithm) {
-	case LZO_ALGORITHM_LZO1X_1:
-	case LZO_ALGORITHM_LZO1X_1_11:
-	case LZO_ALGORITHM_LZO1X_1_12:
-	case LZO_ALGORITHM_LZO1X_1_15:
-		if (lzo->level != 0)
-			goto fail_level;
-		break;
-	case LZO_ALGORITHM_LZO1X_999:
-		if (lzo->level < 1 || lzo->level > 9)
-			goto fail_level;
-		break;
-	default:
-		fputs("Unsupported LZO variant specified.\n", stderr);
-		return -1;
-	}
-
-	return 0;
-fail_level:
-	fputs("Unsupported LZO compression level specified.\n", stderr);
-	return -1;
-}
-
-static ssize_t lzo_comp_block(compressor_t *base, const uint8_t *in,
-			      size_t size, uint8_t *out, size_t outsize)
-{
-	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
-	lzo_uint len = outsize;
-	int ret;
-
-	if (lzo->algorithm == LZO_ALGORITHM_LZO1X_999 &&
-	    lzo->level != LZO_DEFAULT_LEVEL) {
-		ret = lzo1x_999_compress_level(in, size, out, &len,
-					       lzo->buffer, NULL, 0, 0,
-					       lzo->level);
-	} else {
-		ret = lzo_algs[lzo->algorithm].compress(in, size, out,
-							&len, lzo->buffer);
-	}
-
-	if (ret != LZO_E_OK) {
-		fputs("LZO compression failed.\n", stderr);
-		return -1;
-	}
-
-	if (len < size)
-		return len;
-
-	return 0;
-}
-
-static ssize_t lzo_uncomp_block(compressor_t *base, const uint8_t *in,
-				size_t size, uint8_t *out, size_t outsize)
-{
-	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
-	lzo_uint len = outsize;
-	int ret;
-
-	ret = lzo1x_decompress_safe(in, size, out, &len, lzo->buffer);
-
-	if (ret != LZO_E_OK) {
-		fputs("lzo decompress: input data is corrupted\n", stderr);
-		return -1;
-	}
-
-	return len;
-}
-
-static compressor_t *lzo_create_copy(compressor_t *cmp)
-{
-	lzo_compressor_t *other = (lzo_compressor_t *)cmp;
-	lzo_compressor_t *lzo;
-
-	lzo = alloc_flex(sizeof(*lzo), 1, lzo_algs[other->algorithm].bufsize);
-
-	if (lzo == NULL) {
-		perror("creating additional lzo compressor");
-		return NULL;
-	}
-
-	memcpy(lzo, other, sizeof(*lzo));
-	return (compressor_t *)lzo;
-}
-
-static void lzo_destroy(compressor_t *base)
-{
-	free(base);
-}
-
-static int process_options(char *options, int *algorithm, int *level)
-{
-	enum {
-		OPT_ALG = 0,
-		OPT_LEVEL,
-	};
-	char *const token[] = {
-		[OPT_ALG] = (char *)"algorithm",
-		[OPT_LEVEL] = (char *)"level",
-		NULL
-	};
-	char *subopts, *value;
-	size_t i;
-	int opt;
-
-	subopts = options;
-
-	while (*subopts != '\0') {
-		opt = getsubopt(&subopts, token, &value);
-
-		switch (opt) {
-		case OPT_ALG:
-			if (value == NULL)
-				goto fail_value;
-
-			for (i = 0; i < LZO_NUM_ALGS; ++i) {
-				if (strcmp(lzo_algs[i].name, value) == 0) {
-					*algorithm = i;
-					break;
-				}
-			}
-
-			if (i == LZO_NUM_ALGS) {
-				fprintf(stderr, "Unknown lzo variant '%s'.\n",
-					value);
-				return -1;
-			}
-			break;
-		case OPT_LEVEL:
-			if (value == NULL)
-				goto fail_value;
-
-			for (i = 0; isdigit(value[i]); ++i)
-				;
-
-			if (i < 1 || i > 3 || value[i] != '\0')
-				goto fail_level;
-
-			*level = atoi(value);
-
-			if (*level < 1 || *level > 9)
-				goto fail_level;
-			break;
-		default:
-			goto fail_opt;
-		}
-	}
-
-	return 0;
-fail_level:
-	fputs("Compression level must be a number between 1 and 9.\n", stderr);
-	return -1;
-fail_opt:
-	fprintf(stderr, "Unknown option '%s'.\n", value);
-	return -1;
-fail_value:
-	fprintf(stderr, "Missing value for '%s'.\n", token[opt]);
-	return -1;
-}
-
-compressor_t *create_lzo_compressor(bool compress, size_t block_size,
-				    char *options)
-{
-	lzo_compressor_t *lzo;
-	compressor_t *base;
-	int level, alg;
-	(void)block_size;
-
-	alg = LZO_DEFAULT_ALG;
-	level = LZO_DEFAULT_LEVEL;
-
-	if (options != NULL && process_options(options, &alg, &level) != 0)
-		return NULL;
-
-	lzo = alloc_flex(sizeof(*lzo), 1, lzo_algs[alg].bufsize);
-	base = (compressor_t *)lzo;
-
-	if (lzo == NULL) {
-		perror("creating lzo compressor");
-		return NULL;
-	}
-
-	lzo->algorithm = alg;
-	lzo->level = level;
-
-	base->destroy = lzo_destroy;
-	base->do_block = compress ? lzo_comp_block : lzo_uncomp_block;
-	base->write_options = lzo_write_options;
-	base->read_options = lzo_read_options;
-	base->create_copy = lzo_create_copy;
-	return base;
-}
-
-void compressor_lzo_print_help(void)
-{
-	size_t i;
-
-	fputs("Available options for lzo compressor:\n"
-	      "\n"
-	      "    algorithm=<name>  Specify the variant of lzo to use.\n"
-	      "                      Defaults to 'lzo1x_999'.\n"
-	      "    level=<value>     For lzo1x_999, the compression level.\n"
-	      "                      Value from 1 to 9. Defaults to 8.\n"
-	      "                      Ignored if algorithm is not lzo1x_999.\n"
-	      "\n"
-	      "Available algorithms:\n",
-	      stdout);
-
-	for (i = 0; i < LZO_NUM_ALGS; ++i)
-		printf("\t%s\n", lzo_algs[i].name);
-}
diff --git a/lib/comp/process_block.c b/lib/comp/process_block.c
deleted file mode 100644
index 0fcbae0..0000000
--- a/lib/comp/process_block.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * process_block.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "block_processor.h"
-#include "util.h"
-
-#include <string.h>
-#include <zlib.h>
-
-int process_block(block_t *block, compressor_t *cmp,
-		  uint8_t *scratch, size_t scratch_size)
-{
-	ssize_t ret;
-
-	if (!(block->flags & BLK_DONT_CHECKSUM))
-		block->checksum = crc32(0, block->data, block->size);
-
-	if (!(block->flags & BLK_DONT_COMPRESS)) {
-		ret = cmp->do_block(cmp, block->data, block->size,
-				    scratch, scratch_size);
-
-		if (ret < 0)
-			return -1;
-
-		if (ret > 0) {
-			memcpy(block->data, scratch, ret);
-			block->size = ret;
-			block->flags |= BLK_IS_COMPRESSED;
-		}
-	}
-
-	return 0;
-}
diff --git a/lib/comp/xz.c b/lib/comp/xz.c
deleted file mode 100644
index d38aab6..0000000
--- a/lib/comp/xz.c
+++ /dev/null
@@ -1,360 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * xz.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <lzma.h>
-
-#include "internal.h"
-
-typedef enum {
-	XZ_FILTER_X86 = 0x01,
-	XZ_FILTER_POWERPC = 0x02,
-	XZ_FILTER_IA64 = 0x04,
-	XZ_FILTER_ARM = 0x08,
-	XZ_FILTER_ARMTHUMB = 0x10,
-	XZ_FILTER_SPARC = 0x20,
-
-	XZ_FILTER_ALL = 0x3F,
-} XZ_FILTER_FLAG;
-
-typedef struct {
-	compressor_t base;
-	size_t block_size;
-	size_t dict_size;
-	int flags;
-} xz_compressor_t;
-
-typedef struct {
-	uint32_t dict_size;
-	uint32_t flags;
-} xz_options_t;
-
-static const struct {
-	const char *name;
-	lzma_vli filter;
-	int flag;
-} xz_filters[] = {
-	{ "x86", LZMA_FILTER_X86, XZ_FILTER_X86 },
-	{ "powerpc", LZMA_FILTER_POWERPC, XZ_FILTER_POWERPC },
-	{ "ia64", LZMA_FILTER_IA64, XZ_FILTER_IA64 },
-	{ "arm", LZMA_FILTER_ARM, XZ_FILTER_ARM },
-	{ "armthumb", LZMA_FILTER_ARMTHUMB, XZ_FILTER_ARMTHUMB },
-	{ "sparc", LZMA_FILTER_SPARC, XZ_FILTER_SPARC },
-};
-
-#define XZ_NUM_FILTERS (sizeof(xz_filters) / sizeof(xz_filters[0]))
-
-static int xz_write_options(compressor_t *base, int fd)
-{
-	xz_compressor_t *xz = (xz_compressor_t *)base;
-	xz_options_t opt;
-
-	if (xz->flags == 0 && xz->dict_size == xz->block_size)
-		return 0;
-
-	opt.dict_size = htole32(xz->dict_size);
-	opt.flags = htole32(xz->flags);
-
-	return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int xz_read_options(compressor_t *base, int fd)
-{
-	xz_compressor_t *xz = (xz_compressor_t *)base;
-	xz_options_t opt;
-	uint32_t mask;
-
-	if (generic_read_options(fd, &opt, sizeof(opt)))
-		return -1;
-
-	opt.dict_size = le32toh(opt.dict_size);
-	opt.flags = le32toh(opt.flags);
-
-	mask = opt.dict_size & (opt.dict_size - 1);
-
-	if (mask != 0 && ((mask & (mask - 1)) != 0)) {
-		fputs("Invalid lzma dictionary size.\n", stderr);
-		return -1;
-	}
-
-	if (opt.flags & ~XZ_FILTER_ALL) {
-		fputs("Unknown BCJ filter used.\n", stderr);
-		return -1;
-	}
-
-	xz->flags = opt.flags;
-	xz->dict_size = opt.dict_size;
-	return 0;
-}
-
-static ssize_t compress(xz_compressor_t *xz, lzma_vli filter,
-			const uint8_t *in, size_t size,
-			uint8_t *out, size_t outsize)
-{
-	lzma_filter filters[5];
-	lzma_options_lzma opt;
-	size_t written = 0;
-	lzma_ret ret;
-	int i = 0;
-
-	if (lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT)) {
-		fputs("error initializing xz options\n", stderr);
-		return -1;
-	}
-
-	opt.dict_size = xz->dict_size;
-
-	if (filter != LZMA_VLI_UNKNOWN) {
-		filters[i].id = filter;
-		filters[i].options = NULL;
-		++i;
-	}
-
-	filters[i].id = LZMA_FILTER_LZMA2;
-	filters[i].options = &opt;
-	++i;
-
-	filters[i].id = LZMA_VLI_UNKNOWN;
-	filters[i].options = NULL;
-	++i;
-
-	ret = lzma_stream_buffer_encode(filters, LZMA_CHECK_CRC32, NULL,
-					in, size, out, &written, outsize);
-
-	if (ret == LZMA_OK)
-		return (written >= size) ? 0 : written;
-
-	if (ret != LZMA_BUF_ERROR) {
-		fputs("xz block compress failed\n", stderr);
-		return -1;
-	}
-
-	return 0;
-}
-
-static ssize_t xz_comp_block(compressor_t *base, const uint8_t *in,
-			       size_t size, uint8_t *out, size_t outsize)
-{
-	xz_compressor_t *xz = (xz_compressor_t *)base;
-	lzma_vli selected = LZMA_VLI_UNKNOWN;
-	size_t i, smallest;
-	ssize_t ret;
-
-	ret = compress(xz, LZMA_VLI_UNKNOWN, in, size, out, outsize);
-	if (ret < 0 || xz->flags == 0)
-		return ret;
-
-	smallest = ret;
-
-	for (i = 0; i < XZ_NUM_FILTERS; ++i) {
-		if (!(xz->flags & xz_filters[i].flag))
-			continue;
-
-		ret = compress(xz, xz_filters[i].filter, in, size, out, outsize);
-		if (ret < 0)
-			return -1;
-
-		if (ret > 0 && (smallest == 0 || (size_t)ret < smallest)) {
-			smallest = ret;
-			selected = xz_filters[i].filter;
-		}
-	}
-
-	if (smallest == 0)
-		return 0;
-
-	return compress(xz, selected, in, size, out, outsize);
-}
-
-static ssize_t xz_uncomp_block(compressor_t *base, const uint8_t *in,
-			       size_t size, uint8_t *out, size_t outsize)
-{
-	uint64_t memlimit = 32 * 1024 * 1024;
-	size_t dest_pos = 0;
-	size_t src_pos = 0;
-	lzma_ret ret;
-	(void)base;
-
-	ret = lzma_stream_buffer_decode(&memlimit, 0, NULL,
-					in, &src_pos, size,
-					out, &dest_pos, outsize);
-
-	if (ret == LZMA_OK && size == src_pos)
-		return (ssize_t)dest_pos;
-
-	fputs("xz block extract failed\n", stderr);
-	return -1;
-}
-
-static compressor_t *xz_create_copy(compressor_t *cmp)
-{
-	xz_compressor_t *xz = malloc(sizeof(*xz));
-
-	if (xz == NULL) {
-		perror("creating additional xz compressor");
-		return NULL;
-	}
-
-	memcpy(xz, cmp, sizeof(*xz));
-	return (compressor_t *)xz;
-}
-
-static void xz_destroy(compressor_t *base)
-{
-	free(base);
-}
-
-static int process_options(char *options, size_t blocksize,
-			   int *flags, uint64_t *dictsize)
-{
-	enum {
-		OPT_DICT = 0,
-	};
-	char *const token[] = {
-		[OPT_DICT] = (char *)"dictsize",
-		NULL
-	};
-	char *subopts, *value;
-	uint64_t mask;
-	size_t i;
-	int opt;
-
-	subopts = options;
-
-	while (*subopts != '\0') {
-		opt = getsubopt(&subopts, token, &value);
-
-		switch (opt) {
-		case OPT_DICT:
-			if (value == NULL)
-				goto fail_value;
-
-			for (i = 0; isdigit(value[i]); ++i)
-				;
-
-			if (i < 1 || i > 9)
-				goto fail_dict;
-
-			*dictsize = atol(value);
-
-			switch (value[i]) {
-			case '\0':
-				break;
-			case 'm':
-			case 'M':
-				*dictsize <<= 20;
-				break;
-			case 'k':
-			case 'K':
-				*dictsize <<= 10;
-				break;
-			case '%':
-				*dictsize = ((*dictsize) * blocksize) / 100;
-				break;
-			default:
-				goto fail_dict;
-			}
-
-			if (*dictsize > 0x0FFFFFFFFUL)
-				goto fail_dict_ov;
-
-			mask = *dictsize & (*dictsize - 1);
-
-			if (mask != 0 && ((mask & (mask - 1)) != 0))
-				goto fail_dict_pot;
-			break;
-		default:
-			for (i = 0; i < XZ_NUM_FILTERS; ++i) {
-				if (strcmp(value, xz_filters[i].name) == 0) {
-					*flags |= xz_filters[i].flag;
-					break;
-				}
-			}
-			if (i == XZ_NUM_FILTERS)
-				goto fail_opt;
-			break;
-		}
-	}
-
-	return 0;
-fail_dict_pot:
-	fputs("dictionary size must be either 2^n or 2^n + 2^(n-1)\n", stderr);
-	return -1;
-fail_dict_ov:
-	fputs("dictionary size too large.\n", stderr);
-	return -1;
-fail_dict:
-	fputs("dictionary size must be a number with the optional "
-	      "suffix 'm','k' or '%'.\n", stderr);
-	return -1;
-fail_opt:
-	fprintf(stderr, "Unknown option '%s'.\n", value);
-	return -1;
-fail_value:
-	fprintf(stderr, "Missing value for '%s'.\n", token[opt]);
-	return -1;
-}
-
-compressor_t *create_xz_compressor(bool compress, size_t block_size,
-				   char *options)
-{
-	uint64_t dictsize = block_size;
-	xz_compressor_t *xz;
-	compressor_t *base;
-	int flags = 0;
-
-	if (options != NULL) {
-		if (process_options(options, block_size, &flags, &dictsize))
-			return NULL;
-	}
-
-	xz = calloc(1, sizeof(*xz));
-	base = (compressor_t *)xz;
-	if (xz == NULL) {
-		perror("creating xz compressor");
-		return NULL;
-	}
-
-	xz->flags = flags;
-	xz->dict_size = dictsize;
-	xz->block_size = block_size;
-	base->destroy = xz_destroy;
-	base->do_block = compress ? xz_comp_block : xz_uncomp_block;
-	base->write_options = xz_write_options;
-	base->read_options = xz_read_options;
-	base->create_copy = xz_create_copy;
-	return base;
-}
-
-void compressor_xz_print_help(void)
-{
-	size_t i;
-
-	fputs(
-"Available options for xz compressor:\n"
-"\n"
-"    dictsize=<value>  Dictionary size. Either a value in bytes or a\n"
-"                      percentage of the block size. Defaults to 100%.\n"
-"                      The suffix '%' indicates a percentage. 'K' and 'M'\n"
-"                      can also be used for kibi and mebi bytes\n"
-"                      respecitively.\n"
-"\n"
-"In additon to the options, one or more bcj filters can be specified.\n"
-"If multiple filters are provided, the one yielding the best compression\n"
-"ratio will be used.\n"
-"\n"
-"The following filters are available:\n",
-	stdout);
-
-	for (i = 0; i < XZ_NUM_FILTERS; ++i)
-		printf("\t%s\n", xz_filters[i].name);
-}
diff --git a/lib/comp/zstd.c b/lib/comp/zstd.c
deleted file mode 100644
index e206338..0000000
--- a/lib/comp/zstd.c
+++ /dev/null
@@ -1,188 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * zstd.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <ctype.h>
-
-#include <zstd.h>
-
-#include "internal.h"
-
-#define ZSTD_DEFAULT_COMPRESSION_LEVEL 15
-
-typedef struct {
-	compressor_t base;
-	ZSTD_CCtx *zctx;
-	int level;
-} zstd_compressor_t;
-
-typedef struct {
-	uint32_t level;
-} zstd_options_t;
-
-static int zstd_write_options(compressor_t *base, int fd)
-{
-	zstd_compressor_t *zstd = (zstd_compressor_t *)base;
-	zstd_options_t opt;
-	(void)fd;
-
-	if (zstd->level == ZSTD_DEFAULT_COMPRESSION_LEVEL)
-		return 0;
-
-	opt.level = htole32(zstd->level);
-	return generic_write_options(fd, &opt, sizeof(opt));
-}
-
-static int zstd_read_options(compressor_t *base, int fd)
-{
-	zstd_options_t opt;
-	(void)base;
-
-	if (generic_read_options(fd, &opt, sizeof(opt)))
-		return -1;
-
-	opt.level = le32toh(opt.level);
-	return 0;
-}
-
-static ssize_t zstd_comp_block(compressor_t *base, const uint8_t *in,
-			       size_t size, uint8_t *out, size_t outsize)
-{
-	zstd_compressor_t *zstd = (zstd_compressor_t *)base;
-	size_t ret;
-
-	ret = ZSTD_compressCCtx(zstd->zctx, out, outsize, in, size,
-				zstd->level);
-
-	if (ZSTD_isError(ret)) {
-		fprintf(stderr, "internal error in ZSTD compressor: %s\n",
-			ZSTD_getErrorName(ret));
-		return -1;
-	}
-
-	return ret < size ? ret : 0;
-}
-
-static ssize_t zstd_uncomp_block(compressor_t *base, const uint8_t *in,
-				 size_t size, uint8_t *out, size_t outsize)
-{
-	size_t ret;
-	(void)base;
-
-	ret = ZSTD_decompress(out, outsize, in, size);
-
-	if (ZSTD_isError(ret)) {
-		fprintf(stderr, "error uncompressing ZSTD compressed data: %s",
-			ZSTD_getErrorName(ret));
-		return -1;
-	}
-
-	return ret;
-}
-
-static compressor_t *zstd_create_copy(compressor_t *cmp)
-{
-	zstd_compressor_t *zstd = malloc(sizeof(*zstd));
-
-	if (zstd == NULL) {
-		perror("creating additional zstd compressor");
-		return NULL;
-	}
-
-	memcpy(zstd, cmp, sizeof(*zstd));
-
-	zstd->zctx = ZSTD_createCCtx();
-
-	if (zstd->zctx == NULL) {
-		fputs("error creating addtional zstd compression context\n",
-		      stderr);
-		free(zstd);
-		return NULL;
-	}
-
-	return (compressor_t *)zstd;
-}
-
-static void zstd_destroy(compressor_t *base)
-{
-	zstd_compressor_t *zstd = (zstd_compressor_t *)base;
-
-	ZSTD_freeCCtx(zstd->zctx);
-	free(zstd);
-}
-
-compressor_t *create_zstd_compressor(bool compress, size_t block_size,
-				     char *options)
-{
-	zstd_compressor_t *zstd = calloc(1, sizeof(*zstd));
-	compressor_t *base = (compressor_t *)zstd;
-	size_t i;
-	(void)block_size;
-
-	if (zstd == NULL) {
-		perror("creating zstd compressor");
-		return NULL;
-	}
-
-	zstd->level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-
-	if (options != NULL) {
-		if (strncmp(options, "level=", 6) == 0) {
-			options += 6;
-
-			for (i = 0; isdigit(options[i]); ++i)
-				;
-
-			if (i == 0 || options[i] != '\0' || i > 6)
-				goto fail_level;
-
-			zstd->level = atoi(options);
-
-			if (zstd->level < 1 || zstd->level > ZSTD_maxCLevel())
-				goto fail_level;
-		} else {
-			goto fail_opt;
-		}
-	}
-
-	zstd->zctx = ZSTD_createCCtx();
-	if (zstd->zctx == NULL) {
-		fputs("error creating zstd compression context\n", stderr);
-		free(zstd);
-		return NULL;
-	}
-
-	base->destroy = zstd_destroy;
-	base->do_block = compress ? zstd_comp_block : zstd_uncomp_block;
-	base->write_options = zstd_write_options;
-	base->read_options = zstd_read_options;
-	base->create_copy = zstd_create_copy;
-	return base;
-fail_level:
-	fprintf(stderr, "zstd compression level must be a number in the range "
-		"1...%d\n", ZSTD_maxCLevel());
-	free(zstd);
-	return NULL;
-fail_opt:
-	fputs("Unsupported extra options for zstd compressor\n", stderr);
-	free(zstd);
-	return NULL;
-}
-
-void compressor_zstd_print_help(void)
-{
-	printf("Available options for zstd compressor:\n"
-	       "\n"
-	       "    level=<value>    Set compression level. Defaults to %d.\n"
-	       "                     Maximum is %d.\n"
-	       "\n",
-	       ZSTD_DEFAULT_COMPRESSION_LEVEL, ZSTD_maxCLevel());
-}