1 // SPDX-License-Identifier: GPL-2.0+
3 * BTRFS filesystem implementation for U-Boot
5 * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
10 #include <linux/lzo.h>
11 #include <linux/zstd.h>
12 #include <u-boot/zlib.h>
13 #include <asm/unaligned.h>
15 static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
17 u32 tot_len, in_len, res;
24 tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
29 if (tot_len == 0 && dlen)
37 in_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
41 if (in_len > clen || tot_len < 4 + in_len)
44 tot_len -= 4 + in_len;
47 ret = lzo1x_decompress_safe(cbuf, in_len, dbuf, &out_len);
63 #define PRESET_DICT 0x20
65 static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
67 int wbits = MAX_WBITS, ret = -1;
72 memset(&stream, 0, sizeof(stream));
78 stream.next_out = dbuf;
79 stream.avail_out = dlen;
82 /* skip adler32 check if deflate and no dictionary */
83 if (clen > 2 && !(cbuf[1] & PRESET_DICT) &&
84 ((cbuf[0] & 0x0f) == Z_DEFLATED) &&
85 !(((cbuf[0] << 8) + cbuf[1]) % 31)) {
86 wbits = -((cbuf[0] >> 4) + 8);
91 if (Z_OK != inflateInit2(&stream, wbits))
94 while (stream.total_in < clen) {
95 stream.next_in = cbuf + stream.total_in;
96 stream.avail_in = min((u32) (clen - stream.total_in),
97 (u32) btrfs_info.sb.sectorsize);
99 ret = inflate(&stream, Z_NO_FLUSH);
104 res = stream.total_out;
107 if (ret != Z_STREAM_END)
113 #define ZSTD_BTRFS_MAX_WINDOWLOG 17
114 #define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
116 static u32 decompress_zstd(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
118 ZSTD_DStream *dstream;
119 ZSTD_inBuffer in_buf;
120 ZSTD_outBuffer out_buf;
125 wsize = ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT);
126 workspace = malloc(wsize);
128 debug("%s: cannot allocate workspace of size %zu\n", __func__,
133 dstream = ZSTD_initDStream(ZSTD_BTRFS_MAX_INPUT, workspace, wsize);
135 printf("%s: ZSTD_initDStream failed\n", __func__);
150 ret = ZSTD_decompressStream(dstream, &out_buf, &in_buf);
151 if (ZSTD_isError(ret)) {
152 printf("%s: ZSTD_decompressStream error %d\n", __func__,
153 ZSTD_getErrorCode(ret));
157 if (in_buf.pos >= clen || !ret)
168 u32 btrfs_decompress(u8 type, const char *c, u32 clen, char *d, u32 dlen)
174 cbuf = (const u8 *) c;
178 case BTRFS_COMPRESS_NONE:
179 res = dlen < clen ? dlen : clen;
180 memcpy(dbuf, cbuf, res);
182 case BTRFS_COMPRESS_ZLIB:
183 return decompress_zlib(cbuf, clen, dbuf, dlen);
184 case BTRFS_COMPRESS_LZO:
185 return decompress_lzo(cbuf, clen, dbuf, dlen);
186 case BTRFS_COMPRESS_ZSTD:
187 return decompress_zstd(cbuf, clen, dbuf, dlen);
189 printf("%s: Unsupported compression in extent: %i\n", __func__,