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-rw-r--r--lib/io/uncompress/autodetect.c55
-rw-r--r--lib/io/uncompress/bzip2.c118
-rw-r--r--lib/io/uncompress/gzip.c106
-rw-r--r--lib/io/uncompress/istream_compressor.c69
-rw-r--r--lib/io/uncompress/xz.c96
-rw-r--r--lib/io/uncompress/zstd.c81
6 files changed, 525 insertions, 0 deletions
diff --git a/lib/io/uncompress/autodetect.c b/lib/io/uncompress/autodetect.c
new file mode 100644
index 0000000..dde33c8
--- /dev/null
+++ b/lib/io/uncompress/autodetect.c
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * autodetect.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+static const struct {
+ int id;
+ const sqfs_u8 *value;
+ size_t len;
+} magic[] = {
+ { IO_COMPRESSOR_GZIP, (const sqfs_u8 *)"\x1F\x8B\x08", 3 },
+ { IO_COMPRESSOR_XZ, (const sqfs_u8 *)("\xFD" "7zXZ"), 6 },
+ { IO_COMPRESSOR_ZSTD, (const sqfs_u8 *)"\x28\xB5\x2F\xFD", 4 },
+ { IO_COMPRESSOR_BZIP2, (const sqfs_u8 *)"BZh", 3 },
+};
+
+int istream_detect_compressor(istream_t *strm,
+ int (*probe)(const sqfs_u8 *data, size_t size))
+{
+ size_t i;
+ int ret;
+
+ ret = istream_precache(strm);
+ if (ret != 0)
+ return ret;
+
+ if (probe != NULL) {
+ ret = probe(strm->buffer + strm->buffer_offset,
+ strm->buffer_used - strm->buffer_offset);
+ if (ret < 0)
+ return ret;
+
+ /* XXX: this means the data is uncompressed. We do this check
+ first since it might be perfectly OK for the uncompressed
+ data to contain a magic number from the table. */
+ if (ret > 0)
+ return 0;
+ }
+
+ for (i = 0; i < sizeof(magic) / sizeof(magic[0]); ++i) {
+ if ((strm->buffer_used - strm->buffer_offset) < magic[i].len)
+ continue;
+
+ ret = memcmp(strm->buffer + strm->buffer_offset,
+ magic[i].value, magic[i].len);
+
+ if (ret == 0)
+ return magic[i].id;
+ }
+
+ return 0;
+}
diff --git a/lib/io/uncompress/bzip2.c b/lib/io/uncompress/bzip2.c
new file mode 100644
index 0000000..3b44383
--- /dev/null
+++ b/lib/io/uncompress/bzip2.c
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * bzip2.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <bzlib.h>
+
+typedef struct {
+ istream_comp_t base;
+
+ bool initialized;
+ bz_stream strm;
+} istream_bzip2_t;
+
+static int precache(istream_t *base)
+{
+ istream_bzip2_t *bzip2 = (istream_bzip2_t *)base;
+ istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
+ size_t avail;
+ int ret;
+
+ for (;;) {
+ if (!bzip2->initialized) {
+ if (BZ2_bzDecompressInit(&bzip2->strm, 0, 0) != BZ_OK) {
+ fprintf(stderr, "%s: error initializing "
+ "bzip2 decompressor.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+
+ bzip2->initialized = true;
+ }
+
+ ret = istream_precache(wrapped);
+ if (ret != 0)
+ return ret;
+
+ avail = wrapped->buffer_used;
+ if ((sizeof(size_t) > sizeof(unsigned int)) &&
+ (avail > (size_t)UINT_MAX)) {
+ avail = UINT_MAX;
+ }
+
+ bzip2->strm.next_in = (char *)wrapped->buffer;
+ bzip2->strm.avail_in = (unsigned int)avail;
+
+ if (base->buffer_used > BUFSZ)
+ base->buffer_used = BUFSZ;
+
+ avail = BUFSZ - base->buffer_used;
+
+ if ((sizeof(size_t) > sizeof(unsigned int)) &&
+ (avail > (size_t)UINT_MAX)) {
+ avail = UINT_MAX;
+ }
+
+ bzip2->strm.next_out = (char *)base->buffer + base->buffer_used;
+ bzip2->strm.avail_out = (unsigned int)avail;
+
+ if (bzip2->strm.avail_out < 1)
+ break;
+
+ ret = BZ2_bzDecompress(&bzip2->strm);
+
+ if (ret < 0) {
+ fprintf(stderr, "%s: internal error in bzip2 "
+ "decompressor.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+
+ base->buffer_used = BUFSZ - bzip2->strm.avail_out;
+ wrapped->buffer_offset = wrapped->buffer_used -
+ bzip2->strm.avail_in;
+
+ if (ret == BZ_STREAM_END) {
+ if (istream_precache(wrapped))
+ return -1;
+
+ BZ2_bzDecompressEnd(&bzip2->strm);
+ bzip2->initialized = false;
+
+ if (wrapped->buffer_used == 0) {
+ base->eof = true;
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void cleanup(istream_comp_t *base)
+{
+ istream_bzip2_t *bzip2 = (istream_bzip2_t *)base;
+
+ if (bzip2->initialized)
+ BZ2_bzDecompressEnd(&bzip2->strm);
+}
+
+istream_comp_t *istream_bzip2_create(const char *filename)
+{
+ istream_bzip2_t *bzip2 = calloc(1, sizeof(*bzip2));
+ istream_comp_t *base = (istream_comp_t *)bzip2;
+
+ if (bzip2 == NULL) {
+ fprintf(stderr, "%s: creating bzip2 compressor: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ ((istream_t *)base)->precache = precache;
+ base->cleanup = cleanup;
+ return base;
+}
diff --git a/lib/io/uncompress/gzip.c b/lib/io/uncompress/gzip.c
new file mode 100644
index 0000000..1d6274c
--- /dev/null
+++ b/lib/io/uncompress/gzip.c
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * gzip.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <zlib.h>
+
+typedef struct {
+ istream_comp_t base;
+
+ z_stream strm;
+} istream_gzip_t;
+
+static int precache(istream_t *base)
+{
+ istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
+ istream_gzip_t *gzip = (istream_gzip_t *)base;
+ size_t avail_in, avail_out;
+ int ret;
+
+ for (;;) {
+ ret = istream_precache(wrapped);
+ if (ret != 0)
+ return ret;
+
+ avail_in = wrapped->buffer_used;
+ avail_out = BUFSZ - base->buffer_used;
+
+ if (sizeof(size_t) > sizeof(uInt)) {
+ gzip->strm.avail_in = ~((uInt)0U);
+ gzip->strm.avail_out = ~((uInt)0U);
+
+ if ((size_t)gzip->strm.avail_in > avail_in)
+ gzip->strm.avail_in = (uInt)avail_in;
+
+ if ((size_t)gzip->strm.avail_out > avail_out)
+ gzip->strm.avail_out = (uInt)avail_out;
+ } else {
+ gzip->strm.avail_in = (uInt)avail_in;
+ gzip->strm.avail_out = (uInt)avail_out;
+ }
+
+ gzip->strm.next_in = wrapped->buffer;
+ gzip->strm.next_out = base->buffer + base->buffer_used;
+
+ ret = inflate(&gzip->strm, Z_NO_FLUSH);
+
+ wrapped->buffer_offset = wrapped->buffer_used -
+ gzip->strm.avail_in;
+
+ base->buffer_used = BUFSZ - gzip->strm.avail_out;
+
+ if (ret == Z_BUF_ERROR)
+ break;
+
+ if (ret == Z_STREAM_END) {
+ base->eof = true;
+ break;
+ }
+
+ if (ret != Z_OK) {
+ fprintf(stderr,
+ "%s: internal error in gzip decoder.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static void cleanup(istream_comp_t *base)
+{
+ istream_gzip_t *gzip = (istream_gzip_t *)base;
+
+ inflateEnd(&gzip->strm);
+}
+
+istream_comp_t *istream_gzip_create(const char *filename)
+{
+ istream_gzip_t *gzip = calloc(1, sizeof(*gzip));
+ istream_comp_t *base = (istream_comp_t *)gzip;
+ int ret;
+
+ if (gzip == NULL) {
+ fprintf(stderr, "%s: creating gzip decoder: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ ret = inflateInit2(&gzip->strm, 16 + 15);
+ if (ret != Z_OK) {
+ fprintf(stderr,
+ "%s: internal error creating gzip reader.\n",
+ filename);
+ free(gzip);
+ return NULL;
+ }
+
+ ((istream_t *)base)->precache = precache;
+ base->cleanup = cleanup;
+ return base;
+}
diff --git a/lib/io/uncompress/istream_compressor.c b/lib/io/uncompress/istream_compressor.c
new file mode 100644
index 0000000..ab9ad8b
--- /dev/null
+++ b/lib/io/uncompress/istream_compressor.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * istream_compressor.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+static const char *comp_get_filename(istream_t *strm)
+{
+ istream_comp_t *comp = (istream_comp_t *)strm;
+
+ return comp->wrapped->get_filename(comp->wrapped);
+}
+
+static void comp_destroy(sqfs_object_t *obj)
+{
+ istream_comp_t *comp = (istream_comp_t *)obj;
+
+ comp->cleanup(comp);
+ sqfs_destroy(comp->wrapped);
+ free(comp);
+}
+
+istream_t *istream_compressor_create(istream_t *strm, int comp_id)
+{
+ istream_comp_t *comp = NULL;
+ sqfs_object_t *obj;
+ istream_t *base;
+
+ switch (comp_id) {
+ case IO_COMPRESSOR_GZIP:
+#ifdef WITH_GZIP
+ comp = istream_gzip_create(strm->get_filename(strm));
+#endif
+ break;
+ case IO_COMPRESSOR_XZ:
+#ifdef WITH_XZ
+ comp = istream_xz_create(strm->get_filename(strm));
+#endif
+ break;
+ case IO_COMPRESSOR_ZSTD:
+#if defined(WITH_ZSTD) && defined(HAVE_ZSTD_STREAM)
+ comp = istream_zstd_create(strm->get_filename(strm));
+#endif
+ break;
+ case IO_COMPRESSOR_BZIP2:
+#ifdef WITH_BZIP2
+ comp = istream_bzip2_create(strm->get_filename(strm));
+#endif
+ break;
+ default:
+ break;
+ }
+
+ if (comp == NULL)
+ return NULL;
+
+ comp->wrapped = strm;
+
+ base = (istream_t *)comp;
+ base->get_filename = comp_get_filename;
+ base->buffer = comp->uncompressed;
+ base->eof = false;
+
+ obj = (sqfs_object_t *)comp;
+ obj->destroy = comp_destroy;
+ return base;
+}
diff --git a/lib/io/uncompress/xz.c b/lib/io/uncompress/xz.c
new file mode 100644
index 0000000..0fd9ce6
--- /dev/null
+++ b/lib/io/uncompress/xz.c
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * xz.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <lzma.h>
+
+typedef struct {
+ istream_comp_t base;
+
+ lzma_stream strm;
+} istream_xz_t;
+
+static int precache(istream_t *base)
+{
+ istream_xz_t *xz = (istream_xz_t *)base;
+ istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
+ lzma_action action;
+ lzma_ret ret_xz;
+ int ret;
+
+ for (;;) {
+ ret = istream_precache(wrapped);
+ if (ret != 0)
+ return ret;
+
+ action = wrapped->eof ? LZMA_FINISH : LZMA_RUN;
+
+ xz->strm.avail_in = wrapped->buffer_used;
+ xz->strm.next_in = wrapped->buffer;
+
+ xz->strm.avail_out = BUFSZ - base->buffer_used;
+ xz->strm.next_out = base->buffer + base->buffer_used;
+
+ ret_xz = lzma_code(&xz->strm, action);
+
+ base->buffer_used = BUFSZ - xz->strm.avail_out;
+ wrapped->buffer_offset = wrapped->buffer_used -
+ xz->strm.avail_in;
+
+ if (ret_xz == LZMA_BUF_ERROR)
+ break;
+
+ if (ret_xz == LZMA_STREAM_END) {
+ base->eof = true;
+ break;
+ }
+
+ if (ret_xz != LZMA_OK) {
+ fprintf(stderr,
+ "%s: internal error in xz decoder.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static void cleanup(istream_comp_t *base)
+{
+ istream_xz_t *xz = (istream_xz_t *)base;
+
+ lzma_end(&xz->strm);
+}
+
+istream_comp_t *istream_xz_create(const char *filename)
+{
+ istream_xz_t *xz = calloc(1, sizeof(*xz));
+ istream_comp_t *base = (istream_comp_t *)xz;
+ sqfs_u64 memlimit = 65 * 1024 * 1024;
+ lzma_ret ret_xz;
+
+ if (xz == NULL) {
+ fprintf(stderr, "%s: creating xz decoder: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ ret_xz = lzma_stream_decoder(&xz->strm, memlimit, LZMA_CONCATENATED);
+
+ if (ret_xz != LZMA_OK) {
+ fprintf(stderr,
+ "%s: error initializing xz decoder.\n",
+ filename);
+ free(xz);
+ return NULL;
+ }
+
+ ((istream_t *)base)->precache = precache;
+ base->cleanup = cleanup;
+ return base;
+}
diff --git a/lib/io/uncompress/zstd.c b/lib/io/uncompress/zstd.c
new file mode 100644
index 0000000..fd22cbf
--- /dev/null
+++ b/lib/io/uncompress/zstd.c
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * zstd.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "../internal.h"
+
+#include <zstd.h>
+
+#ifdef HAVE_ZSTD_STREAM
+typedef struct {
+ istream_comp_t base;
+
+ ZSTD_DStream* strm;
+} istream_zstd_t;
+
+static int precache(istream_t *base)
+{
+ istream_zstd_t *zstd = (istream_zstd_t *)base;
+ istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
+ ZSTD_outBuffer out;
+ ZSTD_inBuffer in;
+ size_t ret;
+
+ if (istream_precache(wrapped))
+ return -1;
+
+ memset(&in, 0, sizeof(in));
+ memset(&out, 0, sizeof(out));
+
+ in.src = wrapped->buffer;
+ in.size = wrapped->buffer_used;
+
+ out.dst = ((istream_comp_t *)base)->uncompressed + base->buffer_used;
+ out.size = BUFSZ - base->buffer_used;
+
+ ret = ZSTD_decompressStream(zstd->strm, &out, &in);
+
+ if (ZSTD_isError(ret)) {
+ fprintf(stderr, "%s: error in zstd decoder.\n",
+ wrapped->get_filename(wrapped));
+ return -1;
+ }
+
+ wrapped->buffer_offset = in.pos;
+ base->buffer_used += out.pos;
+ return 0;
+}
+
+static void cleanup(istream_comp_t *base)
+{
+ istream_zstd_t *zstd = (istream_zstd_t *)base;
+
+ ZSTD_freeDStream(zstd->strm);
+}
+
+istream_comp_t *istream_zstd_create(const char *filename)
+{
+ istream_zstd_t *zstd = calloc(1, sizeof(*zstd));
+ istream_comp_t *base = (istream_comp_t *)zstd;
+
+ if (zstd == NULL) {
+ fprintf(stderr, "%s: creating zstd decoder: %s.\n",
+ filename, strerror(errno));
+ return NULL;
+ }
+
+ zstd->strm = ZSTD_createDStream();
+ if (zstd->strm == NULL) {
+ fprintf(stderr, "%s: error creating zstd decoder.\n",
+ filename);
+ free(zstd);
+ return NULL;
+ }
+
+ ((istream_t *)base)->precache = precache;
+ base->cleanup = cleanup;
+ return base;
+}
+#endif /* HAVE_ZSTD_STREAM */
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