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![Mikhail Zaslonko](/assets/img/avatar_default.png)
Add decompression functions to zlib_dfltcc library. Update zlib_inflate functions with the hooks for s390 hardware support and adjust workspace structures with extra parameter lists required for hardware inflate decompression. Link: http://lkml.kernel.org/r/20200103223334.20669-4-zaslonko@linux.ibm.com Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Co-developed-by: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Chris Mason <clm@fb.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: David Sterba <dsterba@suse.com> Cc: Eduard Shishkin <edward6@linux.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Josef Bacik <josef@toxicpanda.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
219 lines
4.8 KiB
C
219 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifdef STATIC
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#define PREBOOT
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/* Pre-boot environment: included */
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/* prevent inclusion of _LINUX_KERNEL_H in pre-boot environment: lots
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* errors about console_printk etc... on ARM */
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#define _LINUX_KERNEL_H
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#include "zlib_inflate/inftrees.c"
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#include "zlib_inflate/inffast.c"
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#include "zlib_inflate/inflate.c"
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#ifdef CONFIG_ZLIB_DFLTCC
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#include "zlib_dfltcc/dfltcc.c"
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#include "zlib_dfltcc/dfltcc_inflate.c"
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#endif
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#else /* STATIC */
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/* initramfs et al: linked */
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#include <linux/zutil.h>
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#include "zlib_inflate/inftrees.h"
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#include "zlib_inflate/inffast.h"
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#include "zlib_inflate/inflate.h"
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#include "zlib_inflate/infutil.h"
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#include <linux/decompress/inflate.h>
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#endif /* STATIC */
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#include <linux/decompress/mm.h>
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#define GZIP_IOBUF_SIZE (16*1024)
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static long INIT nofill(void *buffer, unsigned long len)
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{
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return -1;
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}
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/* Included from initramfs et al code */
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STATIC int INIT __gunzip(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf, long out_len,
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long *pos,
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void(*error)(char *x)) {
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u8 *zbuf;
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struct z_stream_s *strm;
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int rc;
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rc = -1;
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if (flush) {
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out_len = 0x8000; /* 32 K */
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out_buf = malloc(out_len);
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} else {
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if (!out_len)
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out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
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}
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if (!out_buf) {
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error("Out of memory while allocating output buffer");
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goto gunzip_nomem1;
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}
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if (buf)
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zbuf = buf;
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else {
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zbuf = malloc(GZIP_IOBUF_SIZE);
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len = 0;
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}
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if (!zbuf) {
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error("Out of memory while allocating input buffer");
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goto gunzip_nomem2;
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}
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strm = malloc(sizeof(*strm));
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if (strm == NULL) {
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error("Out of memory while allocating z_stream");
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goto gunzip_nomem3;
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}
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strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
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#ifdef CONFIG_ZLIB_DFLTCC
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/* Always allocate the full workspace for DFLTCC */
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zlib_inflate_workspacesize());
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#else
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sizeof(struct inflate_state));
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#endif
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if (strm->workspace == NULL) {
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error("Out of memory while allocating workspace");
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goto gunzip_nomem4;
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}
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if (!fill)
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fill = nofill;
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if (len == 0)
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len = fill(zbuf, GZIP_IOBUF_SIZE);
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/* verify the gzip header */
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if (len < 10 ||
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zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
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if (pos)
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*pos = 0;
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error("Not a gzip file");
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goto gunzip_5;
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}
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/* skip over gzip header (1f,8b,08... 10 bytes total +
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* possible asciz filename)
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*/
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strm->next_in = zbuf + 10;
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strm->avail_in = len - 10;
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/* skip over asciz filename */
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if (zbuf[3] & 0x8) {
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do {
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/*
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* If the filename doesn't fit into the buffer,
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* the file is very probably corrupt. Don't try
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* to read more data.
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*/
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if (strm->avail_in == 0) {
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error("header error");
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goto gunzip_5;
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}
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--strm->avail_in;
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} while (*strm->next_in++);
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}
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strm->next_out = out_buf;
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strm->avail_out = out_len;
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rc = zlib_inflateInit2(strm, -MAX_WBITS);
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#ifdef CONFIG_ZLIB_DFLTCC
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/* Always keep the window for DFLTCC */
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#else
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if (!flush) {
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WS(strm)->inflate_state.wsize = 0;
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WS(strm)->inflate_state.window = NULL;
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}
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#endif
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while (rc == Z_OK) {
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if (strm->avail_in == 0) {
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/* TODO: handle case where both pos and fill are set */
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len = fill(zbuf, GZIP_IOBUF_SIZE);
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if (len < 0) {
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rc = -1;
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error("read error");
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break;
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}
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strm->next_in = zbuf;
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strm->avail_in = len;
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}
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rc = zlib_inflate(strm, 0);
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/* Write any data generated */
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if (flush && strm->next_out > out_buf) {
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long l = strm->next_out - out_buf;
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if (l != flush(out_buf, l)) {
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rc = -1;
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error("write error");
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break;
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}
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strm->next_out = out_buf;
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strm->avail_out = out_len;
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}
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/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
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if (rc == Z_STREAM_END) {
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rc = 0;
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break;
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} else if (rc != Z_OK) {
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error("uncompression error");
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rc = -1;
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}
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}
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zlib_inflateEnd(strm);
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if (pos)
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/* add + 8 to skip over trailer */
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*pos = strm->next_in - zbuf+8;
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gunzip_5:
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free(strm->workspace);
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gunzip_nomem4:
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free(strm);
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gunzip_nomem3:
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if (!buf)
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free(zbuf);
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gunzip_nomem2:
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if (flush)
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free(out_buf);
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gunzip_nomem1:
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return rc; /* returns Z_OK (0) if successful */
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}
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#ifndef PREBOOT
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STATIC int INIT gunzip(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf,
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long *pos,
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void (*error)(char *x))
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{
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return __gunzip(buf, len, fill, flush, out_buf, 0, pos, error);
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}
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#else
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STATIC int INIT __decompress(unsigned char *buf, long len,
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long (*fill)(void*, unsigned long),
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long (*flush)(void*, unsigned long),
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unsigned char *out_buf, long out_len,
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long *pos,
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void (*error)(char *x))
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{
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return __gunzip(buf, len, fill, flush, out_buf, out_len, pos, error);
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}
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#endif
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