mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
248 lines
5.9 KiB
C
248 lines
5.9 KiB
C
/* inflate.c -- zlib interface to inflate modules
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* Copyright (C) 1995-1998 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include <linux/module.h>
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#include <linux/zutil.h>
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#include "infblock.h"
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#include "infutil.h"
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int zlib_inflate_workspacesize(void)
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{
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return sizeof(struct inflate_workspace);
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}
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int zlib_inflateReset(
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z_streamp z
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)
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{
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if (z == NULL || z->state == NULL || z->workspace == NULL)
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return Z_STREAM_ERROR;
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z->total_in = z->total_out = 0;
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z->msg = NULL;
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z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
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zlib_inflate_blocks_reset(z->state->blocks, z, NULL);
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return Z_OK;
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}
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int zlib_inflateEnd(
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z_streamp z
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)
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{
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if (z == NULL || z->state == NULL || z->workspace == NULL)
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return Z_STREAM_ERROR;
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if (z->state->blocks != NULL)
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zlib_inflate_blocks_free(z->state->blocks, z);
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z->state = NULL;
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return Z_OK;
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}
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int zlib_inflateInit2_(
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z_streamp z,
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int w,
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const char *version,
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int stream_size
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)
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{
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if (version == NULL || version[0] != ZLIB_VERSION[0] ||
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stream_size != sizeof(z_stream) || z->workspace == NULL)
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return Z_VERSION_ERROR;
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/* initialize state */
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z->msg = NULL;
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z->state = &WS(z)->internal_state;
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z->state->blocks = NULL;
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/* handle undocumented nowrap option (no zlib header or check) */
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z->state->nowrap = 0;
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if (w < 0)
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{
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w = - w;
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z->state->nowrap = 1;
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}
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/* set window size */
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if (w < 8 || w > 15)
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{
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zlib_inflateEnd(z);
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return Z_STREAM_ERROR;
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}
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z->state->wbits = (uInt)w;
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/* create inflate_blocks state */
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if ((z->state->blocks =
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zlib_inflate_blocks_new(z, z->state->nowrap ? NULL : zlib_adler32, (uInt)1 << w))
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== NULL)
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{
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zlib_inflateEnd(z);
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return Z_MEM_ERROR;
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}
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/* reset state */
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zlib_inflateReset(z);
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return Z_OK;
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}
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/*
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* At the end of a Deflate-compressed PPP packet, we expect to have seen
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* a `stored' block type value but not the (zero) length bytes.
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*/
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static int zlib_inflate_packet_flush(inflate_blocks_statef *s)
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{
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if (s->mode != LENS)
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return Z_DATA_ERROR;
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s->mode = TYPE;
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return Z_OK;
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}
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int zlib_inflateInit_(
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z_streamp z,
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const char *version,
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int stream_size
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)
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{
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return zlib_inflateInit2_(z, DEF_WBITS, version, stream_size);
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}
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#undef NEEDBYTE
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#undef NEXTBYTE
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#define NEEDBYTE {if(z->avail_in==0)goto empty;r=trv;}
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#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
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int zlib_inflate(
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z_streamp z,
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int f
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)
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{
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int r, trv;
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uInt b;
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if (z == NULL || z->state == NULL || z->next_in == NULL)
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return Z_STREAM_ERROR;
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trv = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
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r = Z_BUF_ERROR;
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while (1) switch (z->state->mode)
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{
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case METHOD:
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NEEDBYTE
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if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
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{
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z->state->mode = I_BAD;
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z->msg = (char*)"unknown compression method";
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z->state->sub.marker = 5; /* can't try inflateSync */
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break;
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}
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if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
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{
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z->state->mode = I_BAD;
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z->msg = (char*)"invalid window size";
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z->state->sub.marker = 5; /* can't try inflateSync */
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break;
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}
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z->state->mode = FLAG;
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case FLAG:
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NEEDBYTE
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b = NEXTBYTE;
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if (((z->state->sub.method << 8) + b) % 31)
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{
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z->state->mode = I_BAD;
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z->msg = (char*)"incorrect header check";
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z->state->sub.marker = 5; /* can't try inflateSync */
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break;
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}
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if (!(b & PRESET_DICT))
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{
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z->state->mode = BLOCKS;
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break;
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}
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z->state->mode = DICT4;
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case DICT4:
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NEEDBYTE
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z->state->sub.check.need = (uLong)NEXTBYTE << 24;
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z->state->mode = DICT3;
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case DICT3:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE << 16;
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z->state->mode = DICT2;
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case DICT2:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE << 8;
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z->state->mode = DICT1;
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case DICT1:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE;
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z->adler = z->state->sub.check.need;
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z->state->mode = DICT0;
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return Z_NEED_DICT;
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case DICT0:
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z->state->mode = I_BAD;
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z->msg = (char*)"need dictionary";
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z->state->sub.marker = 0; /* can try inflateSync */
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return Z_STREAM_ERROR;
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case BLOCKS:
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r = zlib_inflate_blocks(z->state->blocks, z, r);
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if (f == Z_PACKET_FLUSH && z->avail_in == 0 && z->avail_out != 0)
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r = zlib_inflate_packet_flush(z->state->blocks);
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if (r == Z_DATA_ERROR)
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{
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z->state->mode = I_BAD;
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z->state->sub.marker = 0; /* can try inflateSync */
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break;
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}
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if (r == Z_OK)
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r = trv;
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if (r != Z_STREAM_END)
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return r;
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r = trv;
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zlib_inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
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if (z->state->nowrap)
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{
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z->state->mode = I_DONE;
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break;
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}
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z->state->mode = CHECK4;
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case CHECK4:
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NEEDBYTE
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z->state->sub.check.need = (uLong)NEXTBYTE << 24;
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z->state->mode = CHECK3;
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case CHECK3:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE << 16;
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z->state->mode = CHECK2;
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case CHECK2:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE << 8;
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z->state->mode = CHECK1;
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case CHECK1:
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NEEDBYTE
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z->state->sub.check.need += (uLong)NEXTBYTE;
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if (z->state->sub.check.was != z->state->sub.check.need)
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{
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z->state->mode = I_BAD;
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z->msg = (char*)"incorrect data check";
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z->state->sub.marker = 5; /* can't try inflateSync */
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break;
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}
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z->state->mode = I_DONE;
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case I_DONE:
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return Z_STREAM_END;
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case I_BAD:
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return Z_DATA_ERROR;
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default:
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return Z_STREAM_ERROR;
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}
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empty:
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if (f != Z_PACKET_FLUSH)
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return r;
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z->state->mode = I_BAD;
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z->msg = (char *)"need more for packet flush";
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z->state->sub.marker = 0; /* can try inflateSync */
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return Z_DATA_ERROR;
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}
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