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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /lib/decompress_unlz4.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/decompress_unlz4.c')
-rw-r--r--lib/decompress_unlz4.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c
new file mode 100644
index 000000000..e6327391b
--- /dev/null
+++ b/lib/decompress_unlz4.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd
+ *
+ * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
+ */
+
+#ifdef STATIC
+#define PREBOOT
+#include "lz4/lz4_decompress.c"
+#else
+#include <linux/decompress/unlz4.h>
+#endif
+#include <linux/types.h>
+#include <linux/lz4.h>
+#include <linux/decompress/mm.h>
+#include <linux/compiler.h>
+
+#include <asm/unaligned.h>
+
+/*
+ * Note: Uncompressed chunk size is used in the compressor side
+ * (userspace side for compression).
+ * It is hardcoded because there is not proper way to extract it
+ * from the binary stream which is generated by the preliminary
+ * version of LZ4 tool so far.
+ */
+#define LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE (8 << 20)
+#define ARCHIVE_MAGICNUMBER 0x184C2102
+
+STATIC inline int INIT unlz4(u8 *input, long in_len,
+ long (*fill)(void *, unsigned long),
+ long (*flush)(void *, unsigned long),
+ u8 *output, long *posp,
+ void (*error) (char *x))
+{
+ int ret = -1;
+ size_t chunksize = 0;
+ size_t uncomp_chunksize = LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE;
+ u8 *inp;
+ u8 *inp_start;
+ u8 *outp;
+ long size = in_len;
+#ifdef PREBOOT
+ size_t out_len = get_unaligned_le32(input + in_len);
+#endif
+ size_t dest_len;
+
+
+ if (output) {
+ outp = output;
+ } else if (!flush) {
+ error("NULL output pointer and no flush function provided");
+ goto exit_0;
+ } else {
+ outp = large_malloc(uncomp_chunksize);
+ if (!outp) {
+ error("Could not allocate output buffer");
+ goto exit_0;
+ }
+ }
+
+ if (input && fill) {
+ error("Both input pointer and fill function provided,");
+ goto exit_1;
+ } else if (input) {
+ inp = input;
+ } else if (!fill) {
+ error("NULL input pointer and missing fill function");
+ goto exit_1;
+ } else {
+ inp = large_malloc(LZ4_compressBound(uncomp_chunksize));
+ if (!inp) {
+ error("Could not allocate input buffer");
+ goto exit_1;
+ }
+ }
+ inp_start = inp;
+
+ if (posp)
+ *posp = 0;
+
+ if (fill) {
+ size = fill(inp, 4);
+ if (size < 4) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ }
+
+ chunksize = get_unaligned_le32(inp);
+ if (chunksize == ARCHIVE_MAGICNUMBER) {
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ }
+ } else {
+ error("invalid header");
+ goto exit_2;
+ }
+
+ if (posp)
+ *posp += 4;
+
+ for (;;) {
+
+ if (fill) {
+ size = fill(inp, 4);
+ if (size == 0)
+ break;
+ if (size < 4) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ } else if (size < 4) {
+ /* empty or end-of-file */
+ goto exit_3;
+ }
+
+ chunksize = get_unaligned_le32(inp);
+ if (chunksize == ARCHIVE_MAGICNUMBER) {
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ }
+ if (posp)
+ *posp += 4;
+ continue;
+ }
+
+ if (!fill && chunksize == 0) {
+ /* empty or end-of-file */
+ goto exit_3;
+ }
+
+ if (posp)
+ *posp += 4;
+
+ if (!fill) {
+ inp += 4;
+ size -= 4;
+ } else {
+ if (chunksize > LZ4_compressBound(uncomp_chunksize)) {
+ error("chunk length is longer than allocated");
+ goto exit_2;
+ }
+ size = fill(inp, chunksize);
+ if (size < chunksize) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ }
+#ifdef PREBOOT
+ if (out_len >= uncomp_chunksize) {
+ dest_len = uncomp_chunksize;
+ out_len -= dest_len;
+ } else
+ dest_len = out_len;
+
+ ret = LZ4_decompress_fast(inp, outp, dest_len);
+ chunksize = ret;
+#else
+ dest_len = uncomp_chunksize;
+
+ ret = LZ4_decompress_safe(inp, outp, chunksize, dest_len);
+ dest_len = ret;
+#endif
+ if (ret < 0) {
+ error("Decoding failed");
+ goto exit_2;
+ }
+
+ ret = -1;
+ if (flush && flush(outp, dest_len) != dest_len)
+ goto exit_2;
+ if (output)
+ outp += dest_len;
+ if (posp)
+ *posp += chunksize;
+
+ if (!fill) {
+ size -= chunksize;
+
+ if (size == 0)
+ break;
+ else if (size < 0) {
+ error("data corrupted");
+ goto exit_2;
+ }
+ inp += chunksize;
+ }
+ }
+
+exit_3:
+ ret = 0;
+exit_2:
+ if (!input)
+ large_free(inp_start);
+exit_1:
+ if (!output)
+ large_free(outp);
+exit_0:
+ return ret;
+}
+
+#ifdef PREBOOT
+STATIC int INIT __decompress(unsigned char *buf, long in_len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output, long out_len,
+ long *posp,
+ void (*error)(char *x)
+ )
+{
+ return unlz4(buf, in_len - 4, fill, flush, output, posp, error);
+}
+#endif