mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
135 lines
2.5 KiB
C
135 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* BTRFS filesystem implementation for U-Boot
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*
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*/
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#include "btrfs.h"
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#include <linux/lzo.h>
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#include <u-boot/zlib.h>
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#include <asm/unaligned.h>
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static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
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{
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u32 tot_len, in_len, res;
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size_t out_len;
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int ret;
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if (clen < 4)
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return -1;
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tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
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cbuf += 4;
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clen -= 4;
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tot_len -= 4;
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if (tot_len == 0 && dlen)
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return -1;
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if (tot_len < 4)
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return -1;
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res = 0;
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while (tot_len > 4) {
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in_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
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cbuf += 4;
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clen -= 4;
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if (in_len > clen || tot_len < 4 + in_len)
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return -1;
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tot_len -= 4 + in_len;
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out_len = dlen;
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ret = lzo1x_decompress_safe(cbuf, in_len, dbuf, &out_len);
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if (ret != LZO_E_OK)
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return -1;
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cbuf += in_len;
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clen -= in_len;
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dbuf += out_len;
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dlen -= out_len;
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res += out_len;
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}
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return res;
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}
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/* from zutil.h */
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#define PRESET_DICT 0x20
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static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
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{
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int wbits = MAX_WBITS, ret = -1;
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z_stream stream;
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u8 *cbuf;
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u32 res;
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memset(&stream, 0, sizeof(stream));
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cbuf = (u8 *) _cbuf;
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stream.total_in = 0;
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stream.next_out = dbuf;
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stream.avail_out = dlen;
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stream.total_out = 0;
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/* skip adler32 check if deflate and no dictionary */
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if (clen > 2 && !(cbuf[1] & PRESET_DICT) &&
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((cbuf[0] & 0x0f) == Z_DEFLATED) &&
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!(((cbuf[0] << 8) + cbuf[1]) % 31)) {
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wbits = -((cbuf[0] >> 4) + 8);
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cbuf += 2;
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clen -= 2;
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}
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if (Z_OK != inflateInit2(&stream, wbits))
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return -1;
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while (stream.total_in < clen) {
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stream.next_in = cbuf + stream.total_in;
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stream.avail_in = min((u32) (clen - stream.total_in),
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(u32) btrfs_info.sb.sectorsize);
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ret = inflate(&stream, Z_NO_FLUSH);
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if (ret != Z_OK)
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break;
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}
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res = stream.total_out;
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inflateEnd(&stream);
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if (ret != Z_STREAM_END)
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return -1;
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return res;
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}
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u32 btrfs_decompress(u8 type, const char *c, u32 clen, char *d, u32 dlen)
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{
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u32 res;
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const u8 *cbuf;
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u8 *dbuf;
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cbuf = (const u8 *) c;
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dbuf = (u8 *) d;
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switch (type) {
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case BTRFS_COMPRESS_NONE:
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res = dlen < clen ? dlen : clen;
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memcpy(dbuf, cbuf, res);
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return res;
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case BTRFS_COMPRESS_ZLIB:
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return decompress_zlib(cbuf, clen, dbuf, dlen);
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case BTRFS_COMPRESS_LZO:
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return decompress_lzo(cbuf, clen, dbuf, dlen);
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default:
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printf("%s: Unsupported compression in extent: %i\n", __func__,
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type);
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return -1;
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}
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}
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