1*4549e789STom Rini // SPDX-License-Identifier: GPL 2.0+ OR BSD-3-Clause
2027b728dSJulius Werner /*
3027b728dSJulius Werner * Copyright 2015 Google Inc.
4027b728dSJulius Werner */
5027b728dSJulius Werner
6027b728dSJulius Werner #include <common.h>
7027b728dSJulius Werner #include <compiler.h>
8027b728dSJulius Werner #include <linux/kernel.h>
9027b728dSJulius Werner #include <linux/types.h>
10027b728dSJulius Werner
LZ4_readLE16(const void * src)11027b728dSJulius Werner static u16 LZ4_readLE16(const void *src) { return le16_to_cpu(*(u16 *)src); }
LZ4_copy4(void * dst,const void * src)12027b728dSJulius Werner static void LZ4_copy4(void *dst, const void *src) { *(u32 *)dst = *(u32 *)src; }
LZ4_copy8(void * dst,const void * src)13027b728dSJulius Werner static void LZ4_copy8(void *dst, const void *src) { *(u64 *)dst = *(u64 *)src; }
14027b728dSJulius Werner
15027b728dSJulius Werner typedef uint8_t BYTE;
16027b728dSJulius Werner typedef uint16_t U16;
17027b728dSJulius Werner typedef uint32_t U32;
18027b728dSJulius Werner typedef int32_t S32;
19027b728dSJulius Werner typedef uint64_t U64;
20027b728dSJulius Werner
21027b728dSJulius Werner #define FORCE_INLINE static inline __attribute__((always_inline))
22027b728dSJulius Werner
23027b728dSJulius Werner /* Unaltered (except removing unrelated code) from github.com/Cyan4973/lz4. */
24027b728dSJulius Werner #include "lz4.c" /* #include for inlining, do not link! */
25027b728dSJulius Werner
26027b728dSJulius Werner #define LZ4F_MAGIC 0x184D2204
27027b728dSJulius Werner
28027b728dSJulius Werner struct lz4_frame_header {
29027b728dSJulius Werner u32 magic;
30027b728dSJulius Werner union {
31027b728dSJulius Werner u8 flags;
32027b728dSJulius Werner struct {
33027b728dSJulius Werner u8 reserved0:2;
34027b728dSJulius Werner u8 has_content_checksum:1;
35027b728dSJulius Werner u8 has_content_size:1;
36027b728dSJulius Werner u8 has_block_checksum:1;
37027b728dSJulius Werner u8 independent_blocks:1;
38027b728dSJulius Werner u8 version:2;
39027b728dSJulius Werner };
40027b728dSJulius Werner };
41027b728dSJulius Werner union {
42027b728dSJulius Werner u8 block_descriptor;
43027b728dSJulius Werner struct {
44027b728dSJulius Werner u8 reserved1:4;
45027b728dSJulius Werner u8 max_block_size:3;
46027b728dSJulius Werner u8 reserved2:1;
47027b728dSJulius Werner };
48027b728dSJulius Werner };
49027b728dSJulius Werner /* + u64 content_size iff has_content_size is set */
50027b728dSJulius Werner /* + u8 header_checksum */
51027b728dSJulius Werner } __packed;
52027b728dSJulius Werner
53027b728dSJulius Werner struct lz4_block_header {
54027b728dSJulius Werner union {
55027b728dSJulius Werner u32 raw;
56027b728dSJulius Werner struct {
57027b728dSJulius Werner u32 size:31;
58027b728dSJulius Werner u32 not_compressed:1;
59027b728dSJulius Werner };
60027b728dSJulius Werner };
61027b728dSJulius Werner /* + size bytes of data */
62027b728dSJulius Werner /* + u32 block_checksum iff has_block_checksum is set */
63027b728dSJulius Werner } __packed;
64027b728dSJulius Werner
ulz4fn(const void * src,size_t srcn,void * dst,size_t * dstn)65027b728dSJulius Werner int ulz4fn(const void *src, size_t srcn, void *dst, size_t *dstn)
66027b728dSJulius Werner {
67027b728dSJulius Werner const void *end = dst + *dstn;
68027b728dSJulius Werner const void *in = src;
69027b728dSJulius Werner void *out = dst;
70027b728dSJulius Werner int has_block_checksum;
71027b728dSJulius Werner int ret;
72027b728dSJulius Werner *dstn = 0;
73027b728dSJulius Werner
74027b728dSJulius Werner { /* With in-place decompression the header may become invalid later. */
75027b728dSJulius Werner const struct lz4_frame_header *h = in;
76027b728dSJulius Werner
77027b728dSJulius Werner if (srcn < sizeof(*h) + sizeof(u64) + sizeof(u8))
78027b728dSJulius Werner return -EINVAL; /* input overrun */
79027b728dSJulius Werner
80027b728dSJulius Werner /* We assume there's always only a single, standard frame. */
81027b728dSJulius Werner if (le32_to_cpu(h->magic) != LZ4F_MAGIC || h->version != 1)
82027b728dSJulius Werner return -EPROTONOSUPPORT; /* unknown format */
83027b728dSJulius Werner if (h->reserved0 || h->reserved1 || h->reserved2)
84027b728dSJulius Werner return -EINVAL; /* reserved must be zero */
85027b728dSJulius Werner if (!h->independent_blocks)
86027b728dSJulius Werner return -EPROTONOSUPPORT; /* we can't support this yet */
87027b728dSJulius Werner has_block_checksum = h->has_block_checksum;
88027b728dSJulius Werner
89027b728dSJulius Werner in += sizeof(*h);
90027b728dSJulius Werner if (h->has_content_size)
91027b728dSJulius Werner in += sizeof(u64);
92027b728dSJulius Werner in += sizeof(u8);
93027b728dSJulius Werner }
94027b728dSJulius Werner
95027b728dSJulius Werner while (1) {
9660f989a9SStephen Warren struct lz4_block_header b;
9760f989a9SStephen Warren
9860f989a9SStephen Warren b.raw = le32_to_cpu(*(u32 *)in);
99027b728dSJulius Werner in += sizeof(struct lz4_block_header);
100027b728dSJulius Werner
101027b728dSJulius Werner if (in - src + b.size > srcn) {
102027b728dSJulius Werner ret = -EINVAL; /* input overrun */
103027b728dSJulius Werner break;
104027b728dSJulius Werner }
105027b728dSJulius Werner
106027b728dSJulius Werner if (!b.size) {
107027b728dSJulius Werner ret = 0; /* decompression successful */
108027b728dSJulius Werner break;
109027b728dSJulius Werner }
110027b728dSJulius Werner
111027b728dSJulius Werner if (b.not_compressed) {
112027b728dSJulius Werner size_t size = min((ptrdiff_t)b.size, end - out);
113027b728dSJulius Werner memcpy(out, in, size);
114027b728dSJulius Werner out += size;
115027b728dSJulius Werner if (size < b.size) {
116027b728dSJulius Werner ret = -ENOBUFS; /* output overrun */
117027b728dSJulius Werner break;
118027b728dSJulius Werner }
119027b728dSJulius Werner } else {
120027b728dSJulius Werner /* constant folding essential, do not touch params! */
121027b728dSJulius Werner ret = LZ4_decompress_generic(in, out, b.size,
122027b728dSJulius Werner end - out, endOnInputSize,
123027b728dSJulius Werner full, 0, noDict, out, NULL, 0);
124027b728dSJulius Werner if (ret < 0) {
125027b728dSJulius Werner ret = -EPROTO; /* decompression error */
126027b728dSJulius Werner break;
127027b728dSJulius Werner }
128027b728dSJulius Werner out += ret;
129027b728dSJulius Werner }
130027b728dSJulius Werner
131027b728dSJulius Werner in += b.size;
132027b728dSJulius Werner if (has_block_checksum)
133027b728dSJulius Werner in += sizeof(u32);
134027b728dSJulius Werner }
135027b728dSJulius Werner
136027b728dSJulius Werner *dstn = out - dst;
137027b728dSJulius Werner return ret;
138027b728dSJulius Werner }
139