inflate.c (5c34202b8bf942da411b6599668a76b07449bbfd) inflate.c (8336793baf962163c9fab5a3f39614295fdbab27)
1/* inflate.c -- zlib decompression
2 * Copyright (C) 1995-2005 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 *
5 * Based on zlib 1.2.3 but modified for the Linux Kernel by
6 * Richard Purdie <richard@openedhand.com>
7 *
8 * Changes mainly for static instead of dynamic memory allocation

--- 318 unchanged lines hidden (view full) ---

327 stream available. So the only thing the flush parameter actually does is:
328 when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
329 will return Z_BUF_ERROR if it has not reached the end of the stream.
330 */
331
332int zlib_inflate(z_streamp strm, int flush)
333{
334 struct inflate_state *state;
1/* inflate.c -- zlib decompression
2 * Copyright (C) 1995-2005 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 *
5 * Based on zlib 1.2.3 but modified for the Linux Kernel by
6 * Richard Purdie <richard@openedhand.com>
7 *
8 * Changes mainly for static instead of dynamic memory allocation

--- 318 unchanged lines hidden (view full) ---

327 stream available. So the only thing the flush parameter actually does is:
328 when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
329 will return Z_BUF_ERROR if it has not reached the end of the stream.
330 */
331
332int zlib_inflate(z_streamp strm, int flush)
333{
334 struct inflate_state *state;
335 unsigned char *next; /* next input */
336 unsigned char *put; /* next output */
335 const unsigned char *next; /* next input */
336 unsigned char *put; /* next output */
337 unsigned have, left; /* available input and output */
338 unsigned long hold; /* bit buffer */
339 unsigned bits; /* bits in bit buffer */
340 unsigned in, out; /* save starting available input and output */
341 unsigned copy; /* number of stored or match bytes to copy */
337 unsigned have, left; /* available input and output */
338 unsigned long hold; /* bit buffer */
339 unsigned bits; /* bits in bit buffer */
340 unsigned in, out; /* save starting available input and output */
341 unsigned copy; /* number of stored or match bytes to copy */
342 unsigned char *from; /* where to copy match bytes from */
342 unsigned char *from; /* where to copy match bytes from */
343 code this; /* current decoding table entry */
344 code last; /* parent table entry */
345 unsigned len; /* length to copy for repeats, bits to drop */
346 int ret; /* return code */
347 static const unsigned short order[19] = /* permutation of code lengths */
348 {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
349
350 /* Do not check for strm->next_out == NULL here as ppc zImage

--- 541 unchanged lines hidden (view full) ---

892 Byte *saved_no = z->next_out;
893 uInt saved_ao = z->avail_out;
894
895 if (state->mode != TYPE && state->mode != HEAD)
896 return Z_DATA_ERROR;
897
898 /* Setup some variables to allow misuse of updateWindow */
899 z->avail_out = 0;
343 code this; /* current decoding table entry */
344 code last; /* parent table entry */
345 unsigned len; /* length to copy for repeats, bits to drop */
346 int ret; /* return code */
347 static const unsigned short order[19] = /* permutation of code lengths */
348 {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
349
350 /* Do not check for strm->next_out == NULL here as ppc zImage

--- 541 unchanged lines hidden (view full) ---

892 Byte *saved_no = z->next_out;
893 uInt saved_ao = z->avail_out;
894
895 if (state->mode != TYPE && state->mode != HEAD)
896 return Z_DATA_ERROR;
897
898 /* Setup some variables to allow misuse of updateWindow */
899 z->avail_out = 0;
900 z->next_out = z->next_in + z->avail_in;
900 z->next_out = (unsigned char*)z->next_in + z->avail_in;
901
902 zlib_updatewindow(z, z->avail_in);
903
904 /* Restore saved variables */
905 z->avail_out = saved_ao;
906 z->next_out = saved_no;
907
908 z->adler = state->check =
909 UPDATE(state->check, z->next_in, z->avail_in);
910
911 z->total_out += z->avail_in;
912 z->total_in += z->avail_in;
913 z->next_in += z->avail_in;
914 state->total += z->avail_in;
915 z->avail_in = 0;
916
917 return Z_OK;
918}
901
902 zlib_updatewindow(z, z->avail_in);
903
904 /* Restore saved variables */
905 z->avail_out = saved_ao;
906 z->next_out = saved_no;
907
908 z->adler = state->check =
909 UPDATE(state->check, z->next_in, z->avail_in);
910
911 z->total_out += z->avail_in;
912 z->total_in += z->avail_in;
913 z->next_in += z->avail_in;
914 state->total += z->avail_in;
915 z->avail_in = 0;
916
917 return Z_OK;
918}
919
920#include <linux/errno.h>
921#include <linux/slab.h>
922#include <linux/vmalloc.h>
923
924/* Utility function: initialize zlib, unpack binary blob, clean up zlib,
925 * return len or negative error code. */
926int zlib_inflate_blob(void *gunzip_buf, unsigned sz, const void *buf, unsigned len)
927{
928 const u8 *zbuf = buf;
929 struct z_stream_s *strm;
930 int rc;
931
932 rc = -ENOMEM;
933 strm = kmalloc(sizeof(*strm), GFP_KERNEL);
934 if (strm == NULL)
935 goto gunzip_nomem1;
936 strm->workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
937 if (strm->workspace == NULL)
938 goto gunzip_nomem2;
939
940 /* gzip header (1f,8b,08... 10 bytes total + possible asciz filename)
941 * expected to be stripped from input */
942
943 strm->next_in = zbuf;
944 strm->avail_in = len;
945 strm->next_out = gunzip_buf;
946 strm->avail_out = sz;
947
948 rc = zlib_inflateInit2(strm, -MAX_WBITS);
949 if (rc == Z_OK) {
950 rc = zlib_inflate(strm, Z_FINISH);
951 /* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
952 if (rc == Z_STREAM_END)
953 rc = sz - strm->avail_out;
954 else
955 rc = -EINVAL;
956 zlib_inflateEnd(strm);
957 } else
958 rc = -EINVAL;
959
960 kfree(strm->workspace);
961gunzip_nomem2:
962 kfree(strm);
963gunzip_nomem1:
964 return rc; /* returns Z_OK (0) if successful */
965}