/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 Google LLC
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*/
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#ifndef __LZ4_H
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#define __LZ4_H
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#define LZ4F_MAGIC 0x184D2204
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struct lz4_frame_header {
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u32 magic;
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union {
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u8 flags;
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struct {
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u8 reserved0:2;
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u8 has_content_checksum:1;
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u8 has_content_size:1;
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u8 has_block_checksum:1;
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u8 independent_blocks:1;
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u8 version:2;
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};
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};
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union {
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u8 block_descriptor;
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struct {
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u8 reserved1:4;
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u8 max_block_size:3;
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u8 reserved2:1;
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};
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};
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/* + u64 content_size iff has_content_size is set */
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/* + u8 header_checksum */
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} __packed;
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struct lz4_block_header {
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union {
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u32 raw;
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struct {
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u32 size:31;
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u32 not_compressed:1;
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};
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};
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/* + size bytes of data */
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/* + u32 block_checksum iff has_block_checksum is set */
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} __packed;
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bool lz4_is_valid_header(const unsigned char *h);
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/**
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* ulz4fn() - Decompress LZ4 data
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*
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* @src: Source data to decompress
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* @srcn: Length of source data
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* @dst: Destination for uncompressed data
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* @dstn: Returns length of uncompressed data
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* @return 0 if OK, -EPROTONOSUPPORT if the magic number or version number are
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* not recognised or independent blocks are used, -EINVAL if the reserved
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* fields are non-zero, or input is overrun, -EENOBUFS if the destination
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* buffer is overrun, -EEPROTO if the compressed data causes an error in
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* the decompression algorithm
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*/
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int ulz4fn(const void *src, size_t srcn, void *dst, size_t *dstn);
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#endif
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