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6c03f9e618
Add a header file to house the lz4 compression function. Add a comment while we are here, since it not even clear from the name what the function actuall does. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL 2.0+ OR BSD-3-Clause
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/*
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* Copyright 2015 Google Inc.
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*/
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#include <common.h>
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#include <compiler.h>
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#include <image.h>
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#include <lz4.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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static u16 LZ4_readLE16(const void *src) { return le16_to_cpu(*(u16 *)src); }
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static void LZ4_copy4(void *dst, const void *src) { *(u32 *)dst = *(u32 *)src; }
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static void LZ4_copy8(void *dst, const void *src) { *(u64 *)dst = *(u64 *)src; }
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typedef uint8_t BYTE;
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typedef uint16_t U16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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#define FORCE_INLINE static inline __attribute__((always_inline))
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/* Unaltered (except removing unrelated code) from github.com/Cyan4973/lz4. */
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#include "lz4.c" /* #include for inlining, do not link! */
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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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int ulz4fn(const void *src, size_t srcn, void *dst, size_t *dstn)
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{
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const void *end = dst + *dstn;
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const void *in = src;
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void *out = dst;
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int has_block_checksum;
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int ret;
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*dstn = 0;
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{ /* With in-place decompression the header may become invalid later. */
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const struct lz4_frame_header *h = in;
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if (srcn < sizeof(*h) + sizeof(u64) + sizeof(u8))
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return -EINVAL; /* input overrun */
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/* We assume there's always only a single, standard frame. */
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if (le32_to_cpu(h->magic) != LZ4F_MAGIC || h->version != 1)
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return -EPROTONOSUPPORT; /* unknown format */
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if (h->reserved0 || h->reserved1 || h->reserved2)
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return -EINVAL; /* reserved must be zero */
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if (!h->independent_blocks)
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return -EPROTONOSUPPORT; /* we can't support this yet */
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has_block_checksum = h->has_block_checksum;
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in += sizeof(*h);
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if (h->has_content_size)
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in += sizeof(u64);
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in += sizeof(u8);
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}
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while (1) {
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struct lz4_block_header b;
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b.raw = le32_to_cpu(*(u32 *)in);
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in += sizeof(struct lz4_block_header);
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if (in - src + b.size > srcn) {
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ret = -EINVAL; /* input overrun */
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break;
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}
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if (!b.size) {
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ret = 0; /* decompression successful */
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break;
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}
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if (b.not_compressed) {
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size_t size = min((ptrdiff_t)b.size, end - out);
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memcpy(out, in, size);
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out += size;
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if (size < b.size) {
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ret = -ENOBUFS; /* output overrun */
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break;
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}
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} else {
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/* constant folding essential, do not touch params! */
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ret = LZ4_decompress_generic(in, out, b.size,
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end - out, endOnInputSize,
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full, 0, noDict, out, NULL, 0);
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if (ret < 0) {
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ret = -EPROTO; /* decompression error */
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break;
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}
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out += ret;
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}
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in += b.size;
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if (has_block_checksum)
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in += sizeof(u32);
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}
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*dstn = out - dst;
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return ret;
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}
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