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/*
* Wrapper for decompressing LZIP-compressed kernel, initramfs, and initrd
*
* Copyright (C) 2016-2024 Antonio Diaz Diaz.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#ifdef STATIC
#define PREBOOT
#include "lzip_decompress.c"
#else
#include "linux_lzip.h"
#include "linux_lunzip.h"
#include "linux_mm.h"
#endif
STATIC int INIT __lunzip(unsigned char *inbuf, long in_len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *outbuf, long out_size,
long *in_posp, long *out_posp,
void (*error)(char *x))
{
const int retval = lzip_decompress(inbuf, in_len, fill, flush,
outbuf, out_size, in_posp, out_posp);
switch (retval) {
case 0: break;
case LZIP_OOM_INBUF:
error("Out of memory while allocating input buffer.");
break;
case LZIP_HEADER1_EOF:
error("File ends unexpectedly at member header.");
break;
case LZIP_HEADER2_EOF:
error("Truncated header in multimember file.");
break;
case LZIP_BAD_MAGIC1:
error("Bad magic number (file not in lzip format).");
break;
case LZIP_BAD_MAGIC2:
error("Corrupt header in multimember file.");
break;
case LZIP_BAD_VERSION:
error("Version of lzip member format not supported.");
break;
case LZIP_BAD_DICT_SIZE:
error("Invalid dictionary size in member header.");
break;
case LZIP_OOM_OUTBUF:
error("Out of memory while allocating output buffer.");
break;
case LZIP_WRITE_ERROR:
error("Write error.");
break;
case LZIP_BAD_DATA:
error("LZIP-compressed data is corrupt.");
break;
case LZIP_DATA_EOF:
error("LZIP-compressed data ends unexpectedly.");
break;
case LZIP_BAD_CRC:
error("CRC mismatch in LZIP-compressed data.");
break;
default: error("Bug in the LZIP decompressor.");
}
return retval;
}
#ifndef PREBOOT
/* decompress_fn (see include/linux/decompress/generic.h) should have an
* out_size argument to prevent overflowing outbuf in case of corruption
* of the compressed data.
*/
STATIC int INIT lunzip(unsigned char *inbuf, long in_len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *outbuf,
long *in_posp,
void (*error)(char *x))
{
return __lunzip(inbuf, in_len, fill, flush, outbuf, LONG_MAX,
in_posp, 0, error);
}
#else
STATIC int INIT __decompress(unsigned char *inbuf, long in_len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *outbuf, long out_size,
long *in_posp,
void (*error)(char *x))
{
/* Some archs pass out_size = 0 (to mean unlimited size), which is unsafe
* in case of corruption of the compressed data.
*/
return __lunzip(inbuf, in_len - 4, fill, flush, outbuf,
out_size ? out_size : LONG_MAX, in_posp, 0, error);
}
#endif
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