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update puff.c for gzip inflation (#1022) 

update puff.c for gzip inflation
This commit is contained in:
Arvid Norberg 2016-08-21 14:43:44 -04:00 committed by GitHub
parent 80e5ce9b32
commit debf3c6e36
8 changed files with 166 additions and 153 deletions
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1
ChangeLog
View File

@ -1,5 +1,6 @@
1.1.1 release
* update puff.c for gzip inflation
* add dht_bootstrap_node a setting in settings_pack (and add default)
* make pad-file and symlink support conform to BEP47
* fix piece picker bug that could result in division by zero

6
include/libtorrent/puff.hpp
View File

@ -25,9 +25,7 @@
/*
* See puff.c for purpose and usage.
*/
#include <boost/cstdint.hpp>
int puff(unsigned char *dest, /* pointer to destination pointer */
boost::uint32_t *destlen, /* amount of output space */
unsigned long *destlen, /* amount of output space */
const unsigned char *source, /* pointer to source data pointer */
boost::uint32_t *sourcelen); /* amount of input available */
unsigned long *sourcelen); /* amount of input available */

4
src/gzip.cpp
View File

@ -212,9 +212,9 @@ namespace libtorrent
// start off with 4 kilobytes and grow
// if needed
boost::uint32_t destlen = 4096;
unsigned long destlen = 4096;
int ret = 0;
boost::uint32_t srclen = size - header_len;
unsigned long srclen = size - header_len;
in += header_len;
do

277
src/puff.cpp
View File

@ -1,8 +1,8 @@
/*
* puff.c
* Copyright (C) 2002, 2003 Mark Adler
* Copyright (C) 2002-2013 Mark Adler
* For conditions of distribution and use, see copyright notice in puff.h
* version 1.7, 3 Mar 2003
* version 2.3, 21 Jan 2013
*
* puff.c is a simple inflate written to be an unambiguous way to specify the
* deflate format. It is not written for speed but rather simplicity. As a
@ -49,9 +49,9 @@
* - Fix fixed codes table error
* - Provide a scanning mode for determining size of
* uncompressed data
* 1.3 20 Mar 2002 - Go back to lengths for puff() parameters [Jean-loup]
* 1.3 20 Mar 2002 - Go back to lengths for puff() parameters [Gailly]
* - Add a puff.h file for the interface
* - Add braces in puff() for else do [Jean-loup]
* - Add braces in puff() for else do [Gailly]
* - Use indexes instead of pointers for readability
* 1.4 31 Mar 2002 - Simplify construct() code set check
* - Fix some comments
@ -60,26 +60,33 @@
* 1.6 7 Aug 2002 - Minor format changes
* 1.7 3 Mar 2003 - Added test code for distribution
* - Added zlib-like license
* 1.8 9 Jan 2004 - Added some comments on no distance codes case
* 1.9 21 Feb 2008 - Fix bug on 16-bit integer architectures [Pohland]
* - Catch missing end-of-block symbol error
* 2.0 25 Jul 2008 - Add #define to permit distance too far back
* - Add option in TEST code for puff to write the data
* - Add option in TEST code to skip input bytes
* - Allow TEST code to read from piped stdin
* 2.1 4 Apr 2010 - Avoid variable initialization for happier compilers
* - Avoid unsigned comparisons for even happier compilers
* 2.2 25 Apr 2010 - Fix bug in variable initializations [Oberhumer]
* - Add const where appropriate [Oberhumer]
* - Split if's and ?'s for coverage testing
* - Break out test code to separate file
* - Move NIL to puff.h
* - Allow incomplete code only if single code length is 1
* - Add full code coverage test to Makefile
* 2.3 21 Jan 2013 - Check for invalid code length codes in dynamic blocks
*/
/*
note by Arvid Norberg.
This file was turned into a .cpp file in order to
be able to take advantage of boost's cstdint.hpp file
All "short" has been replaced with boost::int16_t
and all "long" with boost::int32_t according to the
type width assuptions in the comment above.
*/
// this whole file is just preserved and warnings are suppressed
#include "libtorrent/aux_/disable_warnings_push.hpp"
#include <setjmp.h> /* for setjmp(), longjmp(), and jmp_buf */
#include <boost/cstdint.hpp> /* for types with size guarantees */
#include "libtorrent/puff.hpp" /* prototype for puff() */
#include <string.h> /* for NULL */
#include "puff.hpp" /* prototype for puff() */
#define local static /* for local function definitions */
#define NIL ((unsigned char *)0) /* for no output option */
/*
* Maximums for allocations and loops. It is not useful to change these --
@ -95,13 +102,13 @@ type width assuptions in the comment above.
struct state {
/* output state */
unsigned char *out; /* output buffer */
boost::uint32_t outlen; /* available space at out */
boost::uint32_t outcnt; /* bytes written to out so far */
unsigned long outlen; /* available space at out */
unsigned long outcnt; /* bytes written to out so far */
/* input state */
const unsigned char *in; /* input buffer */
boost::uint32_t inlen; /* available input at in */
boost::uint32_t incnt; /* bytes read so far */
unsigned long inlen; /* available input at in */
unsigned long incnt; /* bytes read so far */
int bitbuf; /* bit buffer */
int bitcnt; /* number of bits in bit buffer */
@ -122,22 +129,23 @@ struct state {
*/
local int bits(struct state *s, int need)
{
boost::int32_t val; /* bit accumulator (can use up to 20 bits) */
long val; /* bit accumulator (can use up to 20 bits) */
/* load at least need bits into val */
val = s->bitbuf;
while (s->bitcnt < need) {
if (s->incnt == s->inlen) longjmp(s->env, 1); /* out of input */
val |= (boost::int32_t)(s->in[s->incnt++]) << s->bitcnt; /* load eight bits */
if (s->incnt == s->inlen)
longjmp(s->env, 1); /* out of input */
val |= long(s->in[s->incnt++]) << s->bitcnt; /* load eight bits */
s->bitcnt += 8;
}
/* drop need bits and update buffer, always zero to seven bits left */
s->bitbuf = (int)(val >> need);
s->bitbuf = int(val >> need);
s->bitcnt -= need;
/* return need bits, zeroing the bits above that */
return (int)(val & ((1L << need) - 1));
return int(val & ((1L << need) - 1));
}
/*
@ -166,7 +174,8 @@ local int stored(struct state *s)
s->bitcnt = 0;
/* get length and check against its one's complement */
if (s->incnt + 4 > s->inlen) return 2; /* not enough input */
if (s->incnt + 4 > s->inlen)
return 2; /* not enough input */
len = s->in[s->incnt++];
len |= s->in[s->incnt++] << 8;
if (s->in[s->incnt++] != (~len & 0xff) ||
@ -174,8 +183,9 @@ local int stored(struct state *s)
return -2; /* didn't match complement! */
/* copy len bytes from in to out */
if (s->incnt + len > s->inlen) return 2; /* not enough input */
if (s->out != NIL) {
if (s->incnt + len > s->inlen)
return 2; /* not enough input */
if (s->out != NULL) {
if (s->outcnt + len > s->outlen)
return 1; /* not enough output space */
while (len--)
@ -198,15 +208,15 @@ local int stored(struct state *s)
* seen in the function decode() below.
*/
struct huffman {
boost::int16_t *count; /* number of symbols of each length */
boost::int16_t *symbol; /* canonically ordered symbols */
short *count; /* number of symbols of each length */
short *symbol; /* canonically ordered symbols */
};
/*
* Decode a code from the stream s using huffman table h. Return the symbol or
* a negative value if there is an error. If all of the lengths are zero, i.e.
* an empty code, or if the code is incomplete and an invalid code is received,
* then -9 is returned after reading MAXBITS bits.
* then -10 is returned after reading MAXBITS bits.
*
* Format notes:
*
@ -226,7 +236,7 @@ struct huffman {
* in the deflate format. See the format notes for fixed() and dynamic().
*/
#ifdef SLOW
local int decode(struct state *s, struct huffman *h)
local int decode(struct state *s, const struct huffman *h)
{
int len; /* current number of bits in code */
int code; /* len bits being decoded */
@ -238,14 +248,14 @@ local int decode(struct state *s, struct huffman *h)
for (len = 1; len <= MAXBITS; len++) {
code |= bits(s, 1); /* get next bit */
count = h->count[len];
if (code < first + count) /* if length len, return symbol */
if (code - count < first) /* if length len, return symbol */
return h->symbol[index + (code - first)];
index += count; /* else update for next length */
first += count;
first <<= 1;
code <<= 1;
}
return -9; /* ran out of codes */
return -10; /* ran out of codes */
}
/*
@ -254,7 +264,7 @@ local int decode(struct state *s, struct huffman *h)
* a few percent larger.
*/
#else /* !SLOW */
local int decode(struct state *s, struct huffman *h)
local int decode(struct state *s, const struct huffman *h)
{
int len; /* current number of bits in code */
int code; /* len bits being decoded */
@ -263,7 +273,7 @@ local int decode(struct state *s, struct huffman *h)
int index; /* index of first code of length len in symbol table */
int bitbuf; /* bits from stream */
int left; /* bits left in next or left to process */
boost::int16_t *next; /* next number of codes */
short *next; /* next number of codes */
bitbuf = s->bitbuf;
left = s->bitcnt;
@ -275,7 +285,7 @@ local int decode(struct state *s, struct huffman *h)
code |= bitbuf & 1;
bitbuf >>= 1;
count = *next++;
if (code < first + count) { /* if length len, return symbol */
if (code - count < first) { /* if length len, return symbol */
s->bitbuf = bitbuf;
s->bitcnt = (s->bitcnt - len) & 7;
return h->symbol[index + (code - first)];
@ -287,12 +297,15 @@ local int decode(struct state *s, struct huffman *h)
len++;
}
left = (MAXBITS+1) - len;
if (left == 0) break;
if (s->incnt == s->inlen) longjmp(s->env, 1); /* out of input */
if (left == 0)
break;
if (s->incnt == s->inlen)
longjmp(s->env, 1); /* out of input */
bitbuf = s->in[s->incnt++];
if (left > 8) left = 8;
if (left > 8)
left = 8;
}
return -9; /* ran out of codes */
return -10; /* ran out of codes */
}
#endif /* SLOW */
@ -328,12 +341,12 @@ local int decode(struct state *s, struct huffman *h)
* - Within a given code length, the symbols are kept in ascending order for
* the code bits definition.
*/
local int construct(struct huffman *h, boost::int16_t *length, int n)
local int construct(struct huffman *h, const short *length, int n)
{
int symbol; /* current symbol when stepping through length[] */
int len; /* current length when stepping through h->count[] */
int left; /* number of possible codes left of current length */
boost::int16_t offs[MAXBITS+1]; /* offsets in symbol table for each length */
short offs[MAXBITS+1]; /* offsets in symbol table for each length */
/* count number of codes of each length */
for (len = 0; len <= MAXBITS; len++)
@ -348,7 +361,8 @@ local int construct(struct huffman *h, boost::int16_t *length, int n)
for (len = 1; len <= MAXBITS; len++) {
left <<= 1; /* one more bit, double codes left */
left -= h->count[len]; /* deduct count from possible codes */
if (left < 0) return left; /* over-subscribed--return negative */
if (left < 0)
return left; /* over-subscribed--return negative */
} /* left > 0 means incomplete */
/* generate offsets into symbol table for each length for sorting */
@ -424,23 +438,23 @@ local int construct(struct huffman *h, boost::int16_t *length, int n)
* defined to do the wrong thing in this case.
*/
local int codes(struct state *s,
struct huffman *lencode,
struct huffman *distcode)
const struct huffman *lencode,
const struct huffman *distcode)
{
int symbol; /* decoded symbol */
int len; /* length for copy */
unsigned dist; /* distance for copy */
static const boost::int16_t lens[29] = { /* Size base for length codes 257..285 */
static const short lens[29] = { /* Size base for length codes 257..285 */
3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258};
static const boost::int16_t lext[29] = { /* Extra bits for length codes 257..285 */
static const short lext[29] = { /* Extra bits for length codes 257..285 */
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
static const boost::int16_t dists[30] = { /* Offset base for distance codes 0..29 */
static const short dists[30] = { /* Offset base for distance codes 0..29 */
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
8193, 12289, 16385, 24577};
static const boost::int16_t dext[30] = { /* Extra bits for distance codes 0..29 */
static const short dext[30] = { /* Extra bits for distance codes 0..29 */
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
12, 12, 13, 13};
@ -448,11 +462,13 @@ local int codes(struct state *s,
/* decode literals and length/distance pairs */
do {
symbol = decode(s, lencode);
if (symbol < 0) return symbol; /* invalid symbol */
if (symbol < 0)
return symbol; /* invalid symbol */
if (symbol < 256) { /* literal: symbol is the byte */
/* write out the literal */
if (s->out != NIL) {
if (s->outcnt == s->outlen) return 1;
if (s->out != NULL) {
if (s->outcnt == s->outlen)
return 1;
s->out[s->outcnt] = symbol;
}
s->outcnt++;
@ -460,21 +476,31 @@ local int codes(struct state *s,
else if (symbol > 256) { /* length */
/* get and compute length */
symbol -= 257;
if (symbol >= 29) return -9; /* invalid fixed code */
if (symbol >= 29)
return -10; /* invalid fixed code */
len = lens[symbol] + bits(s, lext[symbol]);
/* get and check distance */
symbol = decode(s, distcode);
if (symbol < 0) return symbol; /* invalid symbol */
if (symbol < 0)
return symbol; /* invalid symbol */
dist = dists[symbol] + bits(s, dext[symbol]);
#ifndef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
if (dist > s->outcnt)
return -10; /* distance too far back */
return -11; /* distance too far back */
#endif
/* copy length bytes from distance bytes back */
if (s->out != NIL) {
if (s->outcnt + len > s->outlen) return 1;
if (s->out != NULL) {
if (s->outcnt + len > s->outlen)
return 1;
while (len--) {
s->out[s->outcnt] = s->out[s->outcnt - dist];
s->out[s->outcnt] =
#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
dist > s->outcnt ?
0 :
#endif
s->out[s->outcnt - dist];
s->outcnt++;
}
}
@ -514,15 +540,20 @@ local int codes(struct state *s,
local int fixed(struct state *s)
{
static int virgin = 1;
static boost::int16_t lencnt[MAXBITS+1], lensym[FIXLCODES];
static boost::int16_t distcnt[MAXBITS+1], distsym[MAXDCODES];
static struct huffman lencode = {lencnt, lensym};
static struct huffman distcode = {distcnt, distsym};
static short lencnt[MAXBITS+1], lensym[FIXLCODES];
static short distcnt[MAXBITS+1], distsym[MAXDCODES];
static struct huffman lencode, distcode;
/* build fixed huffman tables if first call (may not be thread safe) */
if (virgin) {
int symbol;
boost::int16_t lengths[FIXLCODES];
short lengths[FIXLCODES];
/* construct lencode and distcode */
lencode.count = lencnt;
lencode.symbol = lensym;
distcode.count = distcnt;
distcode.symbol = distsym;
/* literal/length table */
for (symbol = 0; symbol < 144; symbol++)
@ -590,6 +621,9 @@ local int fixed(struct state *s)
* block is fewer bits), but it is allowed by the format. So incomplete
* literal/length codes of one symbol should also be permitted.
*
* - If there are only literal codes and no lengths, then there are no distance
* codes. This is represented by one distance code with zero bits.
*
* - The list of up to 286 length/literal lengths and up to 30 distance lengths
* are themselves compressed using Huffman codes and run-length encoding. In
* the list of code lengths, a 0 symbol means no code, a 1..15 symbol means
@ -637,14 +671,19 @@ local int dynamic(struct state *s)
int nlen, ndist, ncode; /* number of lengths in descriptor */
int index; /* index of lengths[] */
int err; /* construct() return value */
boost::int16_t lengths[MAXCODES]; /* descriptor code lengths */
boost::int16_t lencnt[MAXBITS+1], lensym[MAXLCODES]; /* lencode memory */
boost::int16_t distcnt[MAXBITS+1], distsym[MAXDCODES]; /* distcode memory */
struct huffman lencode = {lencnt, lensym}; /* length code */
struct huffman distcode = {distcnt, distsym}; /* distance code */
static const boost::int16_t order[19] = /* permutation of code length codes */
short lengths[MAXCODES]; /* descriptor code lengths */
short lencnt[MAXBITS+1], lensym[MAXLCODES]; /* lencode memory */
short distcnt[MAXBITS+1], distsym[MAXDCODES]; /* distcode memory */
struct huffman lencode, distcode; /* length and distance codes */
static const short order[19] = /* permutation of code length codes */
{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
/* construct lencode and distcode */
lencode.count = lencnt;
lencode.symbol = lensym;
distcode.count = distcnt;
distcode.symbol = distsym;
/* get number of lengths in each table, check lengths */
nlen = bits(s, 5) + 257;
ndist = bits(s, 5) + 1;
@ -660,7 +699,8 @@ local int dynamic(struct state *s)
/* build huffman table for code lengths codes (use lencode temporarily) */
err = construct(&lencode, lengths, 19);
if (err != 0) return -4; /* require complete code set here */
if (err != 0) /* require complete code set here */
return -4;
/* read length/literal and distance code length tables */
index = 0;
@ -669,12 +709,15 @@ local int dynamic(struct state *s)
int len; /* last length to repeat */
symbol = decode(s, &lencode);
if (symbol < 0)
return symbol; /* invalid symbol */
if (symbol < 16) /* length in 0..15 */
lengths[index++] = symbol;
else { /* repeat instruction */
len = 0; /* assume repeating zeros */
if (symbol == 16) { /* repeat last length 3..6 times */
if (index == 0) return -5; /* no last length! */
if (index == 0)
return -5; /* no last length! */
len = lengths[index - 1]; /* last length */
symbol = 3 + bits(s, 2);
}
@ -689,15 +732,19 @@ local int dynamic(struct state *s)
}
}
/* check for end-of-block code -- there better be one! */
if (lengths[256] == 0)
return -9;
/* build huffman table for literal/length codes */
err = construct(&lencode, lengths, nlen);
if (err < 0 || (err > 0 && nlen - lencode.count[0] != 1))
return -7; /* only allow incomplete codes if just one code */
if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
return -7; /* incomplete code ok only for single length 1 code */
/* build huffman table for distance codes */
err = construct(&distcode, lengths + nlen, ndist);
if (err < 0 || (err > 0 && ndist - distcode.count[0] != 1))
return -8; /* only allow incomplete codes if just one code */
if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
return -8; /* incomplete code ok only for single length 1 code */
/* decode data until end-of-block code */
return codes(s, &lencode, &distcode);
@ -733,8 +780,9 @@ local int dynamic(struct state *s)
* -6: dynamic block code description: repeat more than specified lengths
* -7: dynamic block code description: invalid literal/length code lengths
* -8: dynamic block code description: invalid distance code lengths
* -9: invalid literal/length or distance code in fixed or dynamic block
* -10: distance is too far back in fixed or dynamic block
* -9: dynamic block code description: missing end-of-block code
* -10: invalid literal/length or distance code in fixed or dynamic block
* -11: distance is too far back in fixed or dynamic block
*
* Format notes:
*
@ -747,9 +795,9 @@ local int dynamic(struct state *s)
* expected values to check.
*/
int puff(unsigned char *dest, /* pointer to destination pointer */
boost::uint32_t *destlen, /* amount of output space */
unsigned long *destlen, /* amount of output space */
const unsigned char *source, /* pointer to source data pointer */
boost::uint32_t *sourcelen) /* amount of input available */
unsigned long *sourcelen) /* amount of input available */
{
struct state s; /* input/output state */
int last, type; /* block information */
@ -775,11 +823,15 @@ int puff(unsigned char *dest, /* pointer to destination pointer */
do {
last = bits(&s, 1); /* one if last block */
type = bits(&s, 2); /* block type 0..3 */
err = type == 0 ? stored(&s) :
(type == 1 ? fixed(&s) :
(type == 2 ? dynamic(&s) :
err = type == 0 ?
stored(&s) :
(type == 1 ?
fixed(&s) :
(type == 2 ?
dynamic(&s) :
-1)); /* type == 3, invalid */
if (err != 0) break; /* return with error */
if (err != 0)
break; /* return with error */
} while (!last);
}
@ -790,60 +842,3 @@ int puff(unsigned char *dest, /* pointer to destination pointer */
}
return err;
}
#ifdef TEST
/* Example of how to use puff() */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
local unsigned char *yank(char *name, boost::uint32_t *len)
{
boost::uint32_t size;
unsigned char *buf;
FILE *in;
struct stat s;
*len = 0;
if (stat(name, &s)) return NULL;
if ((s.st_mode & S_IFMT) != S_IFREG) return NULL;
size = (boost::uint32_t)(s.st_size);
if (size == 0 || (off_t)size != s.st_size) return NULL;
in = fopen(name, "r");
if (in == NULL) return NULL;
buf = malloc(size);
if (buf != NULL && fread(buf, 1, size, in) != size) {
free(buf);
buf = NULL;
}
fclose(in);
*len = size;
return buf;
}
int main(int argc, char **argv)
{
int ret;
unsigned char *source;
boost::uint32_t len, sourcelen, destlen;
if (argc < 2) return 2;
source = yank(argv[1], &len);
if (source == NULL) return 2;
sourcelen = len;
ret = puff(NIL, &destlen, source, &sourcelen);
if (ret)
printf("puff() failed with return code %d\n", ret);
else {
printf("puff() succeeded uncompressing %lu bytes\n", destlen);
if (sourcelen < len) printf("%lu compressed bytes unused\n",
len - sourcelen);
}
free(source);
return ret;
}
#endif
#include "libtorrent/aux_/disable_warnings_pop.hpp"

4
test/Jamfile
View File

@ -91,7 +91,6 @@ test-suite libtorrent :
test_socket_io.cpp
# test_random.cpp
test_utf8.cpp
test_gzip.cpp
test_bitfield.cpp
test_part_file.cpp
test_peer_list.cpp
@ -123,6 +122,7 @@ test-suite libtorrent :
test_linked_list.cpp
test_file_progress.cpp ]
[ run test_gzip.cpp ]
[ run test_receive_buffer.cpp ]
[ run test_alert_manager.cpp ]
[ run test_direct_dht.cpp ]
@ -188,6 +188,7 @@ alias win-tests :
test_resume
test_tracker
test_checking
test_gzip
;
# the openssl test hangs on the travis osx machine. difficult to debug
@ -227,6 +228,7 @@ alias osx-tests :
test_time_critical
test_pex
test_priority
test_gzip
;
explicit win-tests ;

1
test/Makefile.am
View File

@ -115,6 +115,7 @@ EXTRA_DIST = Jamfile \
mutable_test_torrents/test3.torrent \
mutable_test_torrents/test3_pad_files.torrent \
zeroes.gz \
corrupt.gz \
utf8_test.txt \
web_server.py \
socks.py \

BIN
test/corrupt.gz Normal file
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18
test/test_gzip.cpp
View File

@ -38,7 +38,7 @@ POSSIBILITY OF SUCH DAMAGE.
using namespace libtorrent;
TORRENT_TEST(gzip)
TORRENT_TEST(zeroes)
{
std::vector<char> zipped;
error_code ec;
@ -59,3 +59,19 @@ TORRENT_TEST(gzip)
TEST_EQUAL(inflated[i], 0);
}
TORRENT_TEST(corrupt)
{
std::vector<char> zipped;
error_code ec;
load_file(combine_path("..", "corrupt.gz"), zipped, ec, 1000000);
if (ec) fprintf(stderr, "failed to open file: (%d) %s\n", ec.value()
, ec.message().c_str());
TEST_CHECK(!ec);
std::vector<char> inflated;
inflate_gzip(&zipped[0], zipped.size(), inflated, 1000000, ec);
// we expect this to fail
TEST_CHECK(ec);
}