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-rw-r--r--lib/Makemodule.am20
-rw-r--r--lib/comp/compressor.c35
-rw-r--r--lib/comp/internal.h11
-rw-r--r--lib/comp/lzma.c100
-rw-r--r--lib/comp/zlib.c108
5 files changed, 273 insertions, 1 deletions
diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 18ec8c4..89ec538 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -2,4 +2,22 @@ libfstree_a_SOURCES = lib/fstree/fstree.c lib/fstree/fstree_from_file.c
libfstree_a_SOURCES += lib/fstree/fstree_sort.c
libfstree_a_SOURCES += include/fstree.h
-noinst_LIBRARIES += libfstree.a
+libcompress_a_SOURCES = lib/comp/compressor.c lib/comp/internal.h
+libcompress_a_CFLAGS = $(AM_CFLAGS)
+libcompress_a_CPPFLAGS = $(AM_CPPFLAGS)
+
+if WITH_ZLIB
+libcompress_a_SOURCES += lib/comp/zlib.c
+
+libcompress_a_CFLAGS += $(ZLIB_CFLAGS)
+libcompress_a_CPPFLAGS += -DWITH_ZLIB
+endif
+
+if WITH_LZMA
+libcompress_a_SOURCES += lib/comp/lzma.c
+
+libcompress_a_CFLAGS += $(XZ_CFLAGS)
+libcompress_a_CPPFLAGS += -DWITH_LZMA
+endif
+
+noinst_LIBRARIES += libfstree.a libcompress.a
diff --git a/lib/comp/compressor.c b/lib/comp/compressor.c
new file mode 100644
index 0000000..3bc2b4d
--- /dev/null
+++ b/lib/comp/compressor.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <string.h>
+
+#include "internal.h"
+
+typedef compressor_t *(*compressor_fun_t)(bool compress, size_t block_size);
+
+static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
+#ifdef WITH_ZLIB
+ [SQFS_COMP_GZIP] = create_zlib_compressor,
+#endif
+#ifdef WITH_LZMA
+ [SQFS_COMP_XZ] = create_lzma_compressor,
+#endif
+};
+
+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)
+{
+ if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
+ return NULL;
+
+ if (compressors[id] == NULL)
+ return NULL;
+
+ return compressors[id](compress, block_size);
+}
diff --git a/lib/comp/internal.h b/lib/comp/internal.h
new file mode 100644
index 0000000..17fffe1
--- /dev/null
+++ b/lib/comp/internal.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#ifndef INTERNAL_H
+#define INTERNAL_H
+
+#include "compress.h"
+
+compressor_t *create_lzma_compressor(bool compress, size_t block_size);
+
+compressor_t *create_zlib_compressor(bool compress, size_t block_size);
+
+#endif /* INTERNAL_H */
diff --git a/lib/comp/lzma.c b/lib/comp/lzma.c
new file mode 100644
index 0000000..fd2a6c7
--- /dev/null
+++ b/lib/comp/lzma.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <lzma.h>
+
+#include "internal.h"
+
+typedef struct {
+ compressor_t base;
+
+ size_t block_size;
+ uint8_t buffer[];
+} lzma_compressor_t;
+
+static ssize_t lzma_comp_block(compressor_t *base, uint8_t *block, size_t size)
+{
+ lzma_compressor_t *lzma = (lzma_compressor_t *)base;
+ lzma_filter filters[5];
+ lzma_options_lzma opt;
+ size_t written = 0;
+ lzma_ret ret;
+
+ if (lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT)) {
+ fputs("error initializing LZMA options\n", stderr);
+ return -1;
+ }
+
+ opt.dict_size = lzma->block_size;
+
+ filters[0].id = LZMA_FILTER_LZMA2;
+ filters[0].options = &opt;
+
+ filters[1].id = LZMA_VLI_UNKNOWN;
+ filters[1].options = NULL;
+
+ ret = lzma_stream_buffer_encode(filters, LZMA_CHECK_CRC32, NULL,
+ block, size, lzma->buffer,
+ &written, lzma->block_size);
+
+ if (ret == LZMA_OK) {
+ if (written >= size)
+ return 0;
+
+ memcpy(block, lzma->buffer, size);
+ return written;
+ }
+
+ if (ret != LZMA_BUF_ERROR) {
+ fputs("lzma block compress failed\n", stderr);
+ return -1;
+ }
+
+ return 0;
+}
+
+static ssize_t lzma_uncomp_block(compressor_t *base, uint8_t *block,
+ size_t size)
+{
+ lzma_compressor_t *lzma = (lzma_compressor_t *)base;
+ uint64_t memlimit = 32 * 1024 * 1024;
+ size_t dest_pos = 0;
+ size_t src_pos = 0;
+ lzma_ret ret;
+
+ ret = lzma_stream_buffer_decode(&memlimit, 0, NULL,
+ block, &src_pos, size,
+ lzma->buffer, &dest_pos,
+ lzma->block_size);
+
+ if (ret == LZMA_OK && size == src_pos) {
+ memcpy(block, lzma->buffer, dest_pos);
+ return (ssize_t)dest_pos;
+ }
+
+ fputs("lzma block extract failed\n", stderr);
+ return -1;
+}
+
+static void lzma_destroy(compressor_t *base)
+{
+ free(base);
+}
+
+compressor_t *create_lzma_compressor(bool compress, size_t block_size)
+{
+ lzma_compressor_t *lzma = calloc(1, sizeof(*lzma) + block_size);
+ compressor_t *base = (compressor_t *)lzma;
+
+ if (lzma == NULL) {
+ perror("creating lzma stream");
+ return NULL;
+ }
+
+ lzma->block_size = block_size;
+ base->destroy = lzma_destroy;
+ base->do_block = compress ? lzma_comp_block : lzma_uncomp_block;
+ return base;
+}
diff --git a/lib/comp/zlib.c b/lib/comp/zlib.c
new file mode 100644
index 0000000..d3bfe70
--- /dev/null
+++ b/lib/comp/zlib.c
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <zlib.h>
+
+#include "internal.h"
+
+typedef struct {
+ compressor_t base;
+
+ z_stream strm;
+ bool compress;
+
+ size_t block_size;
+ uint8_t buffer[];
+} zlib_compressor_t;
+
+static void zlib_destroy(compressor_t *base)
+{
+ zlib_compressor_t *zlib = (zlib_compressor_t *)base;
+
+ if (zlib->compress) {
+ deflateEnd(&zlib->strm);
+ } else {
+ inflateEnd(&zlib->strm);
+ }
+
+ free(zlib);
+}
+
+static ssize_t zlib_do_block(compressor_t *base, uint8_t *block, size_t size)
+{
+ zlib_compressor_t *zlib = (zlib_compressor_t *)base;
+ size_t written;
+ int ret;
+
+ if (zlib->compress) {
+ ret = deflateReset(&zlib->strm);
+ } else {
+ ret = inflateReset(&zlib->strm);
+ }
+
+ if (ret != Z_OK) {
+ fputs("resetting zlib stream failed\n", stderr);
+ return -1;
+ }
+
+ zlib->strm.next_in = (void *)block;
+ zlib->strm.avail_in = size;
+ zlib->strm.next_out = zlib->buffer;
+ zlib->strm.avail_out = zlib->block_size;
+
+ if (zlib->compress) {
+ ret = deflate(&zlib->strm, Z_FINISH);
+ } else {
+ ret = inflate(&zlib->strm, Z_FINISH);
+ }
+
+ if (ret == Z_STREAM_END) {
+ written = zlib->strm.total_out;
+
+ if (zlib->compress && written >= size)
+ return 0;
+
+ memcpy(block, zlib->buffer, written);
+ return (ssize_t)written;
+ }
+
+ if (ret != Z_OK) {
+ fputs("zlib block processing failed\n", stderr);
+ return -1;
+ }
+
+ return 0;
+}
+
+compressor_t *create_zlib_compressor(bool compress, size_t block_size)
+{
+ zlib_compressor_t *zlib = calloc(1, sizeof(*zlib) + block_size);
+ compressor_t *base = (compressor_t *)zlib;
+ int ret;
+
+ if (zlib == NULL) {
+ perror("creating zlib stream");
+ return NULL;
+ }
+
+ zlib->compress = compress;
+ zlib->block_size = block_size;
+ base->do_block = zlib_do_block;
+ base->destroy = zlib_destroy;
+
+ if (compress) {
+ ret = deflateInit(&zlib->strm, Z_BEST_COMPRESSION);
+ } else {
+ ret = inflateInit(&zlib->strm);
+ }
+
+ if (ret != Z_OK) {
+ fputs("internal error creating zlib stream\n", stderr);
+ free(zlib);
+ return NULL;
+ }
+
+ return base;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 07:48:38 +0000