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// SPDX-License-Identifier: GPL-2.0-or-later
/*
lzma2eva - convert lzma-compressed file to AVM EVA bootloader format
Copyright (C) 2007 Enrik Berkhan <Enrik.Berkhan@inka.de>
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h> /* crc32 */
#define checksum_add32(csum, data) \
csum += ((uint8_t *)&data)[0]; \
csum += ((uint8_t *)&data)[1]; \
csum += ((uint8_t *)&data)[2]; \
csum += ((uint8_t *)&data)[3];
void
usage(void)
{
fprintf(stderr, "usage: lzma2eva <loadadddr> <entry> <lzmafile> <evafile>\n");
exit(1);
}
void
pexit(const char *msg)
{
perror(msg);
exit(1);
}
int
main(int argc, char *argv[])
{
const char *infile, *outfile;
FILE *in, *out;
static uint8_t buf[4096];
size_t elems;
uint8_t properties;
uint32_t dictsize;
uint64_t datasize;
uint32_t magic = 0xfeed1281L;
uint32_t reclength = 0;
fpos_t reclengthpos;
uint32_t loadaddress = 0;
uint32_t type = 0x075a0201L; /* might be 7Z 2.1? */
uint32_t checksum = 0;
uint32_t compsize = 0;
fpos_t compsizepos;
uint32_t datasize32 = 0;
uint32_t datacrc32 = crc32(0, 0, 0);
uint32_t zero = 0;
uint32_t entry = 0;
if (argc != 5)
usage();
/* "parse" command line */
loadaddress = strtoul(argv[1], 0, 0);
entry = strtoul(argv[2], 0, 0);
infile = argv[3];
outfile = argv[4];
in = fopen(infile, "rb");
if (!in)
pexit("fopen");
out = fopen(outfile, "w+b");
if (!out)
pexit("fopen");
/* read LZMA header */
if (1 != fread(&properties, sizeof properties, 1, in))
pexit("fread");
if (1 != fread(&dictsize, sizeof dictsize, 1, in))
pexit("fread");
if (1 != fread(&datasize, sizeof datasize, 1, in))
pexit("fread");
/* write EVA header */
if (1 != fwrite(&magic, sizeof magic, 1, out))
pexit("fwrite");
if (fgetpos(out, &reclengthpos))
pexit("fgetpos");
if (1 != fwrite(&reclength, sizeof reclength, 1, out))
pexit("fwrite");
if (1 != fwrite(&loadaddress, sizeof loadaddress, 1, out))
pexit("fwrite");
if (1 != fwrite(&type, sizeof type, 1, out))
pexit("fwrite");
/* write EVA LZMA header */
if (fgetpos(out, &compsizepos))
pexit("fgetpos");
if (1 != fwrite(&compsize, sizeof compsize, 1, out))
pexit("fwrite");
/* XXX check length */
datasize32 = (uint32_t)datasize;
if (1 != fwrite(&datasize32, sizeof datasize32, 1, out))
pexit("fwrite");
if (1 != fwrite(&datacrc32, sizeof datacrc32, 1, out))
pexit("fwrite");
/* write modified LZMA header */
if (1 != fwrite(&properties, sizeof properties, 1, out))
pexit("fwrite");
if (1 != fwrite(&dictsize, sizeof dictsize, 1, out))
pexit("fwrite");
if (1 != fwrite(&zero, 3, 1, out))
pexit("fwrite");
/* copy compressed data, calculate crc32 */
while (0 < (elems = fread(&buf, sizeof buf[0], sizeof buf, in))) {
compsize += elems;
if (elems != fwrite(&buf, sizeof buf[0], elems, out))
pexit("fwrite");
datacrc32 = crc32(datacrc32, buf, elems);
}
if (ferror(in))
pexit("fread");
fclose(in);
/* re-write record length */
reclength = compsize + 24;
if (fsetpos(out, &reclengthpos))
pexit("fsetpos");
if (1 != fwrite(&reclength, sizeof reclength, 1, out))
pexit("fwrite");
/* re-write EVA LZMA header including size and data crc */
if (fsetpos(out, &compsizepos))
pexit("fsetpos");
if (1 != fwrite(&compsize, sizeof compsize, 1, out))
pexit("fwrite");
if (1 != fwrite(&datasize32, sizeof datasize32, 1, out))
pexit("fwrite");
if (1 != fwrite(&datacrc32, sizeof datacrc32, 1, out))
pexit("fwrite");
/* calculate record checksum */
checksum += reclength;
checksum += loadaddress;
checksum_add32(checksum, type);
checksum_add32(checksum, compsize);
checksum_add32(checksum, datasize32);
checksum_add32(checksum, datacrc32);
if (fseek(out, 0, SEEK_CUR))
pexit("fseek");
while (0 < (elems = fread(&buf, sizeof buf[0], sizeof buf, out))) {
size_t i;
for (i = 0; i < elems; ++i)
checksum += buf[i];
}
if (ferror(out))
pexit("fread");
if (fseek(out, 0, SEEK_CUR))
pexit("fseek");
checksum = ~checksum + 1;
if (1 != fwrite(&checksum, sizeof checksum, 1, out))
pexit("fwrite");
/* write entry record */
if (1 != fwrite(&zero, sizeof zero, 1, out))
pexit("fwrite");
if (1 != fwrite(&entry, sizeof entry, 1, out))
pexit("fwrite");
if (fclose(out))
pexit("fclose");
return 0;
}
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