131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL 2.0+ OR BSD-3-Clause
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/*
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* Copyright 2015 Google Inc.
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*/
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#include <common.h>
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#include <compiler.h>
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#include <image.h>
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#include <lz4.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <asm/unaligned.h>
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static u16 LZ4_readLE16(const void *src)
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{
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return get_unaligned_le16(src);
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}
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static void LZ4_copy4(void *dst, const void *src)
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{
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put_unaligned(get_unaligned((const u32 *)src), (u32 *)dst);
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}
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static void LZ4_copy8(void *dst, const void *src)
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{
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put_unaligned(get_unaligned((const u64 *)src), (u64 *)dst);
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}
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typedef uint8_t BYTE;
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typedef uint16_t U16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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#define FORCE_INLINE static inline __attribute__((always_inline))
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/* lz4.c is unaltered (except removing unrelated code) from github.com/Cyan4973/lz4. */
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#include "lz4.c" /* #include for inlining, do not link! */
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#define LZ4F_BLOCKUNCOMPRESSED_FLAG 0x80000000U
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int ulz4fn(const void *src, size_t srcn, void *dst, size_t *dstn)
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{
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const void *end = dst + *dstn;
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const void *in = src;
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void *out = dst;
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int has_block_checksum;
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int ret;
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*dstn = 0;
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{ /* With in-place decompression the header may become invalid later. */
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u32 magic;
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u8 flags, version, independent_blocks, has_content_size;
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u8 block_desc;
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if (srcn < sizeof(u32) + 3*sizeof(u8))
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return -EINVAL; /* input overrun */
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magic = get_unaligned_le32(in);
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in += sizeof(u32);
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flags = *(u8 *)in;
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in += sizeof(u8);
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block_desc = *(u8 *)in;
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in += sizeof(u8);
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version = (flags >> 6) & 0x3;
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independent_blocks = (flags >> 5) & 0x1;
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has_block_checksum = (flags >> 4) & 0x1;
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has_content_size = (flags >> 3) & 0x1;
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/* We assume there's always only a single, standard frame. */
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if (magic != LZ4F_MAGIC || version != 1)
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return -EPROTONOSUPPORT; /* unknown format */
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if ((flags & 0x03) || (block_desc & 0x8f))
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return -EINVAL; /* reserved bits must be zero */
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if (!independent_blocks)
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return -EPROTONOSUPPORT; /* we can't support this yet */
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if (has_content_size) {
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if (srcn < sizeof(u32) + 3*sizeof(u8) + sizeof(u64))
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return -EINVAL; /* input overrun */
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in += sizeof(u64);
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}
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/* Header checksum byte */
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in += sizeof(u8);
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}
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while (1) {
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u32 block_header, block_size;
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block_header = get_unaligned_le32(in);
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in += sizeof(u32);
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block_size = block_header & ~LZ4F_BLOCKUNCOMPRESSED_FLAG;
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if (in - src + block_size > srcn) {
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ret = -EINVAL; /* input overrun */
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break;
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}
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if (!block_size) {
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ret = 0; /* decompression successful */
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break;
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}
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if (block_header & LZ4F_BLOCKUNCOMPRESSED_FLAG) {
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size_t size = min((ptrdiff_t)block_size, end - out);
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memcpy(out, in, size);
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out += size;
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if (size < block_size) {
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ret = -ENOBUFS; /* output overrun */
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break;
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}
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} else {
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/* constant folding essential, do not touch params! */
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ret = LZ4_decompress_generic(in, out, block_size,
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end - out, endOnInputSize,
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full, 0, noDict, out, NULL, 0);
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if (ret < 0) {
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ret = -EPROTO; /* decompression error */
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break;
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}
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out += ret;
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}
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in += block_size;
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if (has_block_checksum)
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in += sizeof(u32);
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}
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*dstn = out - dst;
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return ret;
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}
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