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 /* Header for each segment, LE32, recording the compressed size */
17 static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
19 u32 tot_len, in_len, res;
26 tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
31 if (tot_len == 0 && dlen)
33 if (tot_len < LZO_LEN)
38 while (tot_len > LZO_LEN) {
39 in_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
43 if (in_len > clen || tot_len < LZO_LEN + in_len)
46 tot_len -= (LZO_LEN + in_len);
49 ret = lzo1x_decompress_safe(cbuf, in_len, dbuf, &out_len);
65 #define PRESET_DICT 0x20
67 static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
69 int wbits = MAX_WBITS, ret = -1;
74 memset(&stream, 0, sizeof(stream));
80 stream.next_out = dbuf;
81 stream.avail_out = dlen;
84 /* skip adler32 check if deflate and no dictionary */
85 if (clen > 2 && !(cbuf[1] & PRESET_DICT) &&
86 ((cbuf[0] & 0x0f) == Z_DEFLATED) &&
87 !(((cbuf[0] << 8) + cbuf[1]) % 31)) {
88 wbits = -((cbuf[0] >> 4) + 8);
93 if (Z_OK != inflateInit2(&stream, wbits))
96 while (stream.total_in < clen) {
97 stream.next_in = cbuf + stream.total_in;
98 stream.avail_in = min((u32) (clen - stream.total_in),
99 (u32) btrfs_info.sb.sectorsize);
101 ret = inflate(&stream, Z_NO_FLUSH);
106 res = stream.total_out;
109 if (ret != Z_STREAM_END)
115 #define ZSTD_BTRFS_MAX_WINDOWLOG 17
116 #define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
118 static u32 decompress_zstd(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
120 ZSTD_DStream *dstream;
121 ZSTD_inBuffer in_buf;
122 ZSTD_outBuffer out_buf;
127 wsize = ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT);
128 workspace = malloc(wsize);
130 debug("%s: cannot allocate workspace of size %zu\n", __func__,
135 dstream = ZSTD_initDStream(ZSTD_BTRFS_MAX_INPUT, workspace, wsize);
137 printf("%s: ZSTD_initDStream failed\n", __func__);
152 ret = ZSTD_decompressStream(dstream, &out_buf, &in_buf);
153 if (ZSTD_isError(ret)) {
154 printf("%s: ZSTD_decompressStream error %d\n", __func__,
155 ZSTD_getErrorCode(ret));
159 if (in_buf.pos >= clen || !ret)
170 u32 btrfs_decompress(u8 type, const char *c, u32 clen, char *d, u32 dlen)
176 cbuf = (const u8 *) c;
180 case BTRFS_COMPRESS_NONE:
181 res = dlen < clen ? dlen : clen;
182 memcpy(dbuf, cbuf, res);
184 case BTRFS_COMPRESS_ZLIB:
185 return decompress_zlib(cbuf, clen, dbuf, dlen);
186 case BTRFS_COMPRESS_LZO:
187 return decompress_lzo(cbuf, clen, dbuf, dlen);
188 case BTRFS_COMPRESS_ZSTD:
189 return decompress_zstd(cbuf, clen, dbuf, dlen);
191 printf("%s: Unsupported compression in extent: %i\n", __func__,