u-boot/lib/gunzip.c
Simon Glass 5a4f10d71b gzip: Avoid use of u64
The gzip API uses the u64 type in it, which is not available in the host
build. This makes it impossible to include the header file.

We could make this type available, but it seems unnecessary. Limiting the
compression size to that of the 'unsigned long' type seems good enough. On
32-bit machines the limit then becomes 4GB, which likely exceeds available
RAM anyway, therefore it should be sufficient. On 64-bit machines this is
effectively u64 anyway.

Update the header file and implementation to use 'ulong' instead of 'u64'.

Add a definition of u32 for the cases that seem to need exactly that
length. This should be safe enough.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00

311 lines
6.6 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.h>
#include <blk.h>
#include <command.h>
#include <console.h>
#include <div64.h>
#include <gzip.h>
#include <image.h>
#include <malloc.h>
#include <memalign.h>
#include <u-boot/crc.h>
#include <watchdog.h>
#include <u-boot/zlib.h>
#define HEADER0 '\x1f'
#define HEADER1 '\x8b'
#define ZALLOC_ALIGNMENT 16
#define HEAD_CRC 2
#define EXTRA_FIELD 4
#define ORIG_NAME 8
#define COMMENT 0x10
#define RESERVED 0xe0
#define DEFLATED 8
void *gzalloc(void *x, unsigned items, unsigned size)
{
void *p;
size *= items;
size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
p = malloc (size);
return (p);
}
void gzfree(void *x, void *addr, unsigned nb)
{
free (addr);
}
int gzip_parse_header(const unsigned char *src, unsigned long len)
{
int i, flags;
/* skip header */
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
puts ("Error: Bad gzipped data\n");
return (-1);
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= len) {
puts ("Error: gunzip out of data in header\n");
return (-1);
}
return i;
}
int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
{
int offset = gzip_parse_header(src, *lenp);
if (offset < 0)
return offset;
return zunzip(dst, dstlen, src, lenp, 1, offset);
}
#ifdef CONFIG_CMD_UNZIP
__weak
void gzwrite_progress_init(ulong expectedsize)
{
putc('\n');
}
__weak
void gzwrite_progress(int iteration,
ulong bytes_written,
ulong total_bytes)
{
if (0 == (iteration & 3))
printf("%lu/%lu\r", bytes_written, total_bytes);
}
__weak
void gzwrite_progress_finish(int returnval,
ulong bytes_written,
ulong total_bytes,
u32 expected_crc,
u32 calculated_crc)
{
if (0 == returnval) {
printf("\n\t%lu bytes, crc 0x%08x\n",
total_bytes, calculated_crc);
} else {
printf("\n\tuncompressed %lu of %lu\n"
"\tcrcs == 0x%08x/0x%08x\n",
bytes_written, total_bytes,
expected_crc, calculated_crc);
}
}
int gzwrite(unsigned char *src, int len,
struct blk_desc *dev,
unsigned long szwritebuf,
ulong startoffs,
ulong szexpected)
{
int i, flags;
z_stream s;
int r = 0;
unsigned char *writebuf;
unsigned crc = 0;
ulong totalfilled = 0;
lbaint_t blksperbuf, outblock;
u32 expected_crc;
u32 payload_size;
int iteration = 0;
if (!szwritebuf ||
(szwritebuf % dev->blksz) ||
(szwritebuf < dev->blksz)) {
printf("%s: size %lu not a multiple of %lu\n",
__func__, szwritebuf, dev->blksz);
return -1;
}
if (startoffs & (dev->blksz-1)) {
printf("%s: start offset %lu not a multiple of %lu\n",
__func__, startoffs, dev->blksz);
return -1;
}
blksperbuf = szwritebuf / dev->blksz;
outblock = lldiv(startoffs, dev->blksz);
/* skip header */
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
puts("Error: Bad gzipped data\n");
return -1;
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= len-8) {
puts("Error: gunzip out of data in header");
return -1;
}
payload_size = len - i - 8;
memcpy(&expected_crc, src + len - 8, sizeof(expected_crc));
expected_crc = le32_to_cpu(expected_crc);
u32 szuncompressed;
memcpy(&szuncompressed, src + len - 4, sizeof(szuncompressed));
if (szexpected == 0) {
szexpected = le32_to_cpu(szuncompressed);
} else if (szuncompressed != (u32)szexpected) {
printf("size of %lx doesn't match trailer low bits %x\n",
szexpected, szuncompressed);
return -1;
}
if (lldiv(szexpected, dev->blksz) > (dev->lba - outblock)) {
printf("%s: uncompressed size %lu exceeds device size\n",
__func__, szexpected);
return -1;
}
gzwrite_progress_init(szexpected);
s.zalloc = gzalloc;
s.zfree = gzfree;
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf("Error: inflateInit2() returned %d\n", r);
return -1;
}
s.next_in = src + i;
s.avail_in = payload_size+8;
writebuf = (unsigned char *)malloc_cache_aligned(szwritebuf);
/* decompress until deflate stream ends or end of file */
do {
if (s.avail_in == 0) {
printf("%s: weird termination with result %d\n",
__func__, r);
break;
}
/* run inflate() on input until output buffer not full */
do {
unsigned long blocks_written;
int numfilled;
lbaint_t writeblocks;
s.avail_out = szwritebuf;
s.next_out = writebuf;
r = inflate(&s, Z_SYNC_FLUSH);
if ((r != Z_OK) &&
(r != Z_STREAM_END)) {
printf("Error: inflate() returned %d\n", r);
goto out;
}
numfilled = szwritebuf - s.avail_out;
crc = crc32(crc, writebuf, numfilled);
totalfilled += numfilled;
if (numfilled < szwritebuf) {
writeblocks = (numfilled+dev->blksz-1)
/ dev->blksz;
memset(writebuf+numfilled, 0,
dev->blksz-(numfilled%dev->blksz));
} else {
writeblocks = blksperbuf;
}
gzwrite_progress(iteration++,
totalfilled,
szexpected);
blocks_written = blk_dwrite(dev, outblock,
writeblocks, writebuf);
outblock += blocks_written;
if (ctrlc()) {
puts("abort\n");
goto out;
}
WATCHDOG_RESET();
} while (s.avail_out == 0);
/* done when inflate() says it's done */
} while (r != Z_STREAM_END);
if ((szexpected != totalfilled) ||
(crc != expected_crc))
r = -1;
else
r = 0;
out:
gzwrite_progress_finish(r, totalfilled, szexpected,
expected_crc, crc);
free(writebuf);
inflateEnd(&s);
return r;
}
#endif
/*
* Uncompress blocks compressed with zlib without headers
*/
int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
int stoponerr, int offset)
{
z_stream s;
int err = 0;
int r;
s.zalloc = gzalloc;
s.zfree = gzfree;
r = inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
printf("Error: inflateInit2() returned %d\n", r);
return -1;
}
s.next_in = src + offset;
s.avail_in = *lenp - offset;
s.next_out = dst;
s.avail_out = dstlen;
do {
r = inflate(&s, Z_FINISH);
if (stoponerr == 1 && r != Z_STREAM_END &&
(s.avail_in == 0 || s.avail_out == 0 || r != Z_BUF_ERROR)) {
printf("Error: inflate() returned %d\n", r);
err = -1;
break;
}
} while (r == Z_BUF_ERROR);
*lenp = s.next_out - (unsigned char *) dst;
inflateEnd(&s);
return err;
}