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sunzip.c
1828 lines (1627 loc) · 62 KB
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sunzip.c
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/* sunzip.c -- streaming unzip for reading a zip file from stdin
Copyright (C) 2006, 2014, 2016, 2021 Mark Adler
version 0.5 6 Jan 2021
This software is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Mark Adler madler@alumni.caltech.edu
*/
/* Version history:
0.1 3 Jun 2006 First version -- verifies deflated and stored entries
0.2 4 Jun 2006 Add more PK signatures to reject or ignore
Allow for an Info-ZIP zip data descriptor signature
as well as a PKWare appnote data descriptor (no signature)
0.3 4 Jul 2006 Handle (by skipping) digital sig and zip64 end fields
Use read() from stdin for speed (unbuffered)
Use inflateBack() instead of inflate() for speed
Handle deflate64 entries with inflateBack9()
Add quiet (-q) and really quiet (-qq) options
If stdin not redirected, give command help
Write out files, add -t option to just test
Add -o option to overwrite existing files
Decode and apply MS-DOS timestamp
Decode and apply Unix timestamp extra fields
Allow for several different types of data descriptors
Handle bzip2 (method 12) decompression
Process zip64 local headers and use full lengths
Use central directory for names to allow conversion
Apply external attributes from central directory
Detect and create symbolic links
Catch user interrupt and delete temporary junk
0.31 7 Jul 2006 Get name from UTF-8 extra field if present
Fix zip64central offset bug
Change null-replacement character to underscore
Fix bad() error message mid-line handling
Fix stored length corruption bug
Verify that stored lengths are equal
Use larger input buffer when int type is large
Don't use calloc() when int type is large
0.32 14 Jul 2006 Consolidate and simplify extra field processing
Use more portable stat() structure definitions
Allow use of mktemp() when mkdtemp() is not available
0.33 23 Jul 2006 Replace futimes() with utimes() for portability
Fix bug in bzip2 decoding
Do two passes on command options to allow any order
Change pathbrk() return value to simplify usage
Protect against parent references ("..") in file names
Move name processing to after possibly getting UTF-8 name
0.34 15 Jan 2014 Add option to change the replacement character for ..
Fix bug in the handling of extended timestamps
Allow bit 11 to be set in general purpose flags
0.4 11 Jul 2016 Use blast for DCL imploded entries (method 10)
Add zlib license
0.5 6 Jan 2021 Add -r option to retain temporary files in the event of
an error.
*/
/* Notes:
- Compile and link sunzip with zlib 1.2.3 or later, infback9.c and
inftree9.c (found in the zlib source distribution in contrib/infback9),
blast.c from zlib 1.2.9 or later (found in contrib/blast), and libbzip2.
*/
/* To-do:
- Set EIGHTDOT3 for file systems that so restrict the file names
- Tailor path name operations for different operating systems
- Set the long data descriptor signature once it's specified by PKWare
(looks like that will never happen)
- Handle the entry name "-" differently? (Created by piped zip.)
*/
/* ----- External Functions, Types, and Constants Definitions ----- */
#include <stdio.h> /* printf(), fprintf(), fflush(), rename(), puts(), */
/* fopen(), fread(), fclose() */
#include <stdlib.h> /* exit(), malloc(), calloc(), free() */
#include <string.h> /* memcpy(), strcpy(), strlen(), strcmp() */
#include <ctype.h> /* tolower() */
#include <limits.h> /* LONG_MIN */
#include <time.h> /* mktime() */
#include <sys/time.h> /* utimes() */
#include <assert.h> /* assert() */
#include <signal.h> /* signal() */
#include <unistd.h> /* read(), close(), isatty(), chdir(), mkdtemp() or */
/* mktemp(), unlink(), rmdir(), symlink() */
#include <fcntl.h> /* open(), write(), O_WRONLY, O_CREAT, O_EXCL */
#include <sys/types.h> /* for mkdir(), stat() */
#include <sys/stat.h> /* mkdir(), stat() */
#include <errno.h> /* errno, EEXIST */
#include <dirent.h> /* opendir(), readdir(), closedir() */
#include "zlib.h" /* crc32(), z_stream, inflateBackInit(), */
/* inflateBack(), inflateBackEnd() */
#ifndef JUST_DEFLATE
#include "infback9.h" /* inflateBack9Init(), inflate9Back(), */
/* inflateBack9End() */
#include "blast.h" /* blast() */
#include "bzlib.h" /* BZ2_bzDecompressInit(), BZ2_bzDecompress(), */
/* BZ2_bzDecompressEnd() */
#endif
/* ----- Language Readability Enhancements (sez me) ----- */
#define local static
#define until(c) while(!(c))
/* ----- Operating System Configuration and Tailoring ----- */
/* hack to avoid end-of-line conversions */
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
/* # include <fcntl.h> */
# include <io.h>
# define SET_BINARY_MODE(file) setmode(file, O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
/* defines for the lengths of the integer types -- assure that longs are either
four bytes or greater than or equal to eight bytes in length */
#if UINT_MAX > 0xffff
# define BIGINT
#endif
#if ULONG_MAX >= 0xffffffffffffffffUL
# define BIGLONG
# if ULONG_MAX > 0xffffffffffffffffUL
# define GIANTLONG
# endif
#else
# if ULONG_MAX != 0xffffffffUL
# error Unexpected size of long data type
# endif
#endif
/* systems for which mkdtemp() is not provided */
#ifdef VMS
# define NOMKDTEMP
#endif
/* %% need to #define EIGHTDOT3 if limited to 8.3 names, e.g. DOS FAT */
/* ----- Operating System Specific Path Name Operations ----- */
/* %% This entire section should be tailored for various operating system
conventions for path name syntax -- currently set up for Unix */
/* Safe file name character to replace nulls with */
#define SAFESEP '_'
/* Unix path delimiter */
#define PATHDELIM '/'
/* Unix parent reference and replacement character (repeated) */
#define PARENT ".."
local int parrepl = '_';
/* convert a block into a string -- replace any zeros and terminate with a
zero; this assumes that blk is at least len+1 long */
local void tostr(char *blk, unsigned len)
{
while (len--) {
if (*blk == 0)
*blk = SAFESEP;
blk++;
}
*blk = 0;
}
/* see if it's a directory */
local int isdir(char *path)
{
size_t len;
len = strlen(path);
return len && path[len - 1] == PATHDELIM;
}
/* add a delimiter to a path and return a pointer to where to put the next
name (assumes that space is available) */
local char *pathcat(char *path)
{
size_t len;
len = strlen(path);
path += len;
if (len && path[-1] != PATHDELIM) {
*path++ = PATHDELIM;
*path = 0;
}
return path;
}
/* given a path, find the next path delimiter and return a pointer to the start
of it, or return a pointer to the end of the string if the name has no path
delimiter after it */
local char *pathbrk(char *path)
{
while (*path && *path != PATHDELIM)
path++;
return path;
}
/* given a path, skip over path delimiters, if any, to get to the start of the
next level name */
local char *pathtok(char *path)
{
while (*path == PATHDELIM)
path++;
return path;
}
/* secure the path name by removing root or device references, and any parent
directory references */
local char *guard(char *path)
{
int was;
char *left, *prev, *name, *cut;
/* skip leading path delimiters */
path = pathtok(path);
/* remove parent references */
left = path;
while (*left) {
/* if have a leading parent reference, replace it with safe separators
and then prevent deletion of that by moving past it */
cut = pathbrk(left);
was = *cut;
*cut = 0;
if (strcmp(left, PARENT) == 0) {
while (*left)
*left++ = parrepl;
*cut = was;
left = pathtok(cut);
continue;
}
*cut = was;
/* find non-leading parent reference, if any */
prev = left;
while (*(name = pathtok(cut))) {
cut = pathbrk(name);
was = *cut;
*cut = 0;
if (strcmp(name, PARENT) == 0) {
*cut = was;
break;
}
*cut = was;
prev = name;
}
if (*name == 0)
break; /* no more parent references, all done */
/* delete parent and parent reference and start over */
strcpy(prev, pathtok(cut));
}
/* return secured path */
return path;
}
/* convert name from source to current operating system, using the information
in the madeby value from the central directory -- name updated in place or
name is freed and a new malloc'ed space returned */
local char *tohere(char *name, unsigned madeby)
{
(void)madeby;
return name;
}
/* ----- Utility Operations ----- */
/* mkdtemp() template for temporary directory (if changed, adjust size of
tempdir[] below) */
#define TEMPDIR "_zXXXXXX"
/* temporary directory and possibly name -- big enough to hold TEMPDIR,
delimiter, the to36() result which is up to 13 characters, and the
null terminator (that's 12 + 1 + 13 + 1 == 27), adjust as needed for
path delimiters that are more than one character */
local char tempdir[27];
/* make a temporary directory (avoid race condition if mkdtemp available) */
local char *mktempdir(char *template)
{
#ifdef NOMKDTEMP
template = mktemp(template);
if (template != NULL && mkdir(template, 0700))
template = NULL;
return template;
#else
return mkdtemp(template);
#endif
}
/* remove temporary directory and contents */
local void rmtempdir(void)
{
char *temp;
DIR *dir;
struct dirent *ent;
/* if already removed or never made, then done */
if (tempdir[0] == 0)
return;
/* get just the directory name */
temp = pathbrk(tempdir);
*temp = 0;
/* scan the directory and remove its contents */
dir = opendir(tempdir);
if (dir != NULL) {
temp = pathcat(tempdir);
while ((ent = readdir(dir)) != NULL) {
strcpy(temp, ent->d_name);
unlink(tempdir);
}
closedir(dir);
}
/* remove the empty directory */
temp = pathbrk(tempdir);
*temp = 0;
rmdir(tempdir);
/* mark it as gone */
tempdir[0] = 0;
}
/* relocate the temporary directory contents */
local void mvtempdir(char *newtemp)
{
char *temp, *dest;
DIR *dir;
struct dirent *ent;
/* get just the temporary directory name */
temp = pathbrk(tempdir);
*temp = 0;
/* scan it and move the contents to newtemp */
dir = opendir(tempdir);
if (dir == NULL)
return;
temp = pathcat(tempdir);
dest = pathcat(newtemp);
while ((ent = readdir(dir)) != NULL) {
strcpy(temp, ent->d_name);
strcpy(dest, ent->d_name);
rename(tempdir, newtemp);
}
closedir(dir);
/* remove path delimiters from names */
temp = pathbrk(tempdir);
*temp = 0;
dest = pathbrk(newtemp);
*dest = 0;
}
/* true if in the middle of a line on stdout */
local int midline = 0;
/* true to retain temporary files in the event of an error */
local int retain = 0;
/* abort with an error message */
local int bye(char *why)
{
if (!retain)
rmtempdir(); /* don't leave a mess behind */
putchar(midline ? '\n' : '\r');
fflush(stdout);
fprintf(stderr, "sunzip abort: %s\n", why);
exit(1);
return 0; /* to make compiler happy -- will never get here */
}
/* convert an unsigned 32-bit integer to signed, even if long > 32 bits */
local long tolong(unsigned long val)
{
return (long)(val & 0x7fffffffUL) - (long)(val & 0x80000000UL);
}
/* allocate memory and abort on failure */
local void *alloc(size_t size)
{
void *got;
got = malloc(size);
if (got == NULL)
bye("out of memory");
return got;
}
/* allocate memory and duplicate a string */
local char *strnew(char *str)
{
char *ret;
ret = alloc(strlen(str) + 1);
strcpy(ret, str);
return ret;
}
/* Convert an 8-byte unsigned integer into a base 36 number using 0-9 and A-Z
for the digits -- the digits are written least to most significant with no
trailing zeros; if EIGHTDOT3 defined, put the digits in the 8.3 file name
format, and fail if the offset is too large to fit in 11 digits (~ 10^17) */
local char *to36(unsigned long low, unsigned long high)
{
unsigned rem;
#ifndef BIGLONG
unsigned tmp;
#endif
char *next;
static char num[14]; /* good for up to 2^64 - 1 */
/* check type lengths and input to protect num[] array */
#ifdef BIGLONG
#ifdef GIANTLONG
assert(low <= (1UL << 64) - 1);
#endif
assert(high == 0);
#endif
/* convert to base 36 */
next = num;
do {
#ifdef BIGLONG
/* use 64-bit division */
rem = low % 36;
low /= 36;
#else
/* divide 8-byte value by 36 (assumes 4-byte integers) */
/* special values are 2^32 div 36 == 119304647, 2^32 mod 36 == 4 */
rem = (unsigned)(high % 36);
high /= 36;
tmp = (unsigned)(low % 36);
low /= 36;
low += 119304647UL * rem; /* can't overflow */
tmp += rem << 2; /* rem times (2^32 mod 36) */
rem = tmp % 36;
tmp /= 36;
low += tmp; /* can't overflow here either */
#endif
#ifdef EIGHTDOT3
/* insert a dot for 8.3 names, and fail if more than 11 digits */
if (next - num == 8)
*next++ = '.';
if (next - num == 12)
bye("zip file too big for FAT file system names");
#endif
/* write a digit and divide again until nothing left */
*next++ = rem < 10 ? '0' + rem : 'A' + rem - 10;
} while (low || high);
/* terminate and return string */
*next = 0;
return num;
}
/* ----- Input/Output Operations ----- */
/* structure for output processing */
struct out {
int file; /* output file or -1 to not write */
unsigned long crc; /* accumulated CRC-32 of output */
unsigned long count; /* output byte count */
unsigned long count_hi; /* count overflow */
};
/* process inflate output, writing if requested */
local int put(void *out_desc, unsigned char *buf, unsigned len)
{
int wrote;
unsigned try;
struct out *out = (struct out *)out_desc;
#ifndef BIGINT
/* handle special inflateBack9() case for 64K len */
if (len == 0) {
len = 32768U;
put(out, buf, len);
buf += len;
}
#endif
/* update crc and output byte count */
out->crc = crc32(out->crc, buf, len);
out->count += len;
if (out->count < len)
out->count_hi++;
if (out->file != -1)
while (len) { /* loop since write() may not complete request */
try = len >= 32768U ? 16384 : len;
wrote = write(out->file, buf, try);
if (wrote == -1)
bye("write error");
len -= wrote;
buf += wrote;
}
return 0;
}
/* structure for input acquisition and processing */
struct in {
int file; /* input file */
unsigned char *buf; /* input buffer */
unsigned long count; /* input byte count */
unsigned long count_hi; /* count overflow */
unsigned long offset; /* input stream offset of end of buffer */
unsigned long offset_hi; /* input stream offset overflow */
};
/* Input buffer size (must fit in signed int) */
#ifdef BIGINT
# define CHUNK 131072
#else
# define CHUNK 16384
#endif
/* Load input buffer, assumed to be empty, and return bytes loaded and a
pointer to them. read() is called until the buffer is full, or until it
returns end-of-file or error. Abort program on error using bye(). */
local unsigned get(void *in_desc, unsigned char **buf)
{
int got;
unsigned want, len;
unsigned char *next;
struct in *in = (struct in *)in_desc;
next = in->buf;
if (buf != NULL)
*buf = next;
want = CHUNK;
do { /* loop since read() not assured to return request */
got = (int)read(in->file, next, want);
if (got == -1)
bye("zip file read error");
next += got;
want -= got;
} until (got == 0 || want == 0);
len = CHUNK - want; /* how much is in buffer */
in->count += len;
if (in->count < len)
in->count_hi++;
in->offset += len;
if (in->offset < len)
in->offset_hi++;
return len;
}
/* load input buffer, abort if EOF */
#define load(in) ((left = get(in, NULL)) == 0 ? \
bye("unexpected end of zip file") : (next = in->buf, left))
/* get one, two, or four bytes little-endian from the buffer, abort if EOF */
#define get1(in) (left == 0 ? load(in) : 0, left--, *next++)
#define get2(in) (tmp2 = get1(in), tmp2 + (get1(in) << 8))
#define get4(in) (tmp4 = get2(in), tmp4 + ((unsigned long)get2(in) << 16))
/* skip len bytes, abort if EOF */
#define skip(len, in) \
do { \
tmp4 = len; \
while (tmp4 > left) { \
tmp4 -= left; \
load(in); \
} \
left -= (unsigned)tmp4; \
next += (unsigned)tmp4; \
} while (0)
/* read header field into output buffer */
#define field(len, in) \
do { \
tmp2 = len; \
tmpp = outbuf; \
while (tmp2 > left) { \
memcpy(tmpp, next, left); \
tmp2 -= left; \
tmpp += left; \
load(in); \
} \
memcpy(tmpp, next, tmp2); \
left -= tmp2; \
next += tmp2; \
} while (0)
/* ----- File and Directory Operations ----- */
/* structure for directory cache, also saves times and pre-existence */
struct tree {
char *name; /* name of this directory */
int new; /* true if directory didn't already exist */
long acc; /* last access time */
long mod; /* last modification time */
struct tree *subs; /* list of subdirectories */
struct tree *next; /* next directory at this level */
};
/* directory cache */
local struct tree *root = NULL; /* linked list of top-level directories */
/* add a path to the cache -- if file true, then whatever comes after the last
delimiter is a file name, so don't make a directory with that name nor use
the access and modify times; note if the directory already existed or not */
local void graft(char *path, int file, long acc, long mod)
{
int ret, was = 0;
char *name, *cut;
struct tree **branch;
/* make the path safe before creating it */
path = guard(path);
if (*path == 0) /* if no name, nothing to do */
return;
/* process each name in the provided path */
name = path;
branch = &root;
for (;;) {
/* cut out next name in path */
cut = pathbrk(name);
was = *cut;
*cut = 0;
if (was == 0 && file)
break; /* don't do last name for a file */
/* search for that name in the list */
while (*branch != NULL) {
if (strcmp((*branch)->name, name) == 0)
break;
branch = &((*branch)->next);
}
/* if it's not in the list, add it and create */
if (*branch == NULL) {
*branch = alloc(sizeof(struct tree));
(*branch)->name = strnew(name);
(*branch)->acc = LONG_MIN;
(*branch)->mod = LONG_MIN;
(*branch)->subs = NULL;
(*branch)->next = NULL;
ret = mkdir(path, 0777);
if (ret && errno != EEXIST)
bye("write error");
(*branch)->new = ret == 0;
}
/* see if there's more path -- if not, then done */
if (was == 0)
break;
*cut = was; /* restore delimiter */
name = pathtok(cut); /* next name, skipping delimiters */
if (*name == 0) /* ended with a delimiter */
break;
/* go down a level for the next name */
branch = &((*branch)->subs);
}
/* if a directory, set the directory times for the last leaf */
if (!file && acc != LONG_MIN) {
(*branch)->acc = acc;
(*branch)->mod = mod;
}
return;
}
/* apply the saved directory times to the directories */
local void setdirtimes(struct tree *branch)
{
struct timeval times[2]; /* access and modify times */
while (branch != NULL) {
/* update the times for all the subdirectories of this directory */
if (branch->subs != NULL) {
if (chdir(branch->name) == 0) {
setdirtimes(branch->subs);
chdir("..");
}
}
/* then update the times for this directory if new and we have times */
if (branch->new && branch->acc != LONG_MIN) {
times[0].tv_sec = branch->acc;
times[0].tv_usec = 0;
times[1].tv_sec = branch->mod;
times[1].tv_usec = 0;
utimes(branch->name, times);
}
/* go to the next directory in the list */
branch = branch->next;
}
}
/* release the memory used by the branch (prune(&root) frees it all) */
local void prune(struct tree **branch)
{
struct tree *here, *next;
/* snip from the tree */
here = *branch;
*branch = NULL;
/* prune and then free each of the branches in the list */
while (here != NULL) {
prune(&(here->subs));
free(here->name);
next = here->next;
free(here);
here = next;
}
}
/* create a path if it doesn't exist (root paths allowed here) */
local void mkpath(char *path)
{
int was;
char *dir, *next;
/* scan path */
dir = pathtok(path); /* go to first name */
while ((was = *(next = pathbrk(dir))) != 0) {
*next = 0;
if (mkdir(path, 0777) && errno != EEXIST)
bye("write error");
*next = was;
dir = pathtok(next + 1); /* go to next name */
}
if (*dir && mkdir(path, 0777) && errno != EEXIST)
bye("write error");
}
/* see if the name exists and what it is */
local int ftype(char *name)
{
struct stat st;
if (lstat(name, &st))
return 0;
switch (st.st_mode & S_IFMT) {
case S_IFREG: return 1;
case S_IFDIR: return 2;
case S_IFLNK: return 3;
default: return 4;
}
}
/* ----- Time Operations ----- */
/* convert MS-DOS date and time to a Unix time, assuming current timezone
(you got a better idea?) */
local long dos2time(unsigned long dos)
{
struct tm tm;
if (dos == 0)
return (unsigned long)time(NULL);
tm.tm_year = ((int)(dos >> 25) & 0x7f) + 80;
tm.tm_mon = ((int)(dos >> 21) & 0xf) - 1;
tm.tm_mday = (int)(dos >> 16) & 0x1f;
tm.tm_hour = (int)(dos >> 11) & 0x1f;
tm.tm_min = (int)(dos >> 5) & 0x3f;
tm.tm_sec = (int)(dos << 1) & 0x3e;
tm.tm_isdst = -1; /* figure out if DST or not */
return (long)mktime(&tm);
}
/* ----- Zip Format Operations ----- */
/* list of local header offsets of skipped entries (encrypted or old method) */
unsigned long skipped; /* number of entries in list */
unsigned long skiplen; /* how many the list can hold */
unsigned long *skiplist; /* skipped entry list (allocated) */
/* add an entry to the skip list */
local void skipadd(unsigned long here, unsigned long here_hi)
{
unsigned long size;
#ifdef BIGLONG
(void)here_hi;
#endif
/* allocate or resize list if needed */
if (skipped == skiplen) {
skiplen = skiplen ? skiplen << 1 : 512;
#ifdef BIGLONG
size = skiplen * sizeof(unsigned long);
#else
size = skiplen << 3;
#endif
skiplist = skiplist == NULL ? malloc(size) : realloc(skiplist, size);
if (skiplist == NULL)
bye("out of memory");
}
/* add entry to list */
#ifdef BIGLONG
skiplist[skipped++] = here;
#else
skiplist[skipped << 1] = here;
skiplist[(skipped << 1) + 1] = here_hi;
skipped++;
#endif
}
/* binary search for entry in skip list (assumes ordered), return true if it's
there */
local int skipfind(unsigned long here, unsigned long here_hi)
{
unsigned long left, right, mid, low;
#ifndef BIGLONG
unsigned long high;
#else
(void)here_hi;
#endif
left = 1;
right = skipped;
while (left <= right) {
mid = left + ((right - left) >> 2);
#ifdef BIGLONG
low = skiplist[mid - 1];
#else
low = skiplist[(mid - 1) << 1];
high = skiplist[((mid - 1) << 1) + 1];
if (here_hi == high) {
#endif
if (here < low)
right = mid - 1;
else if (here > low)
left = mid + 1;
else
return 1;
#ifndef BIGLONG
}
else {
if (here_hi < high)
right = mid - 1;
else
left = mid + 1;
}
#endif
}
return 0;
}
/* pull two and four-byte little-endian integers from buffer */
#define little2(ptr) ((ptr)[0] + ((ptr)[1] << 8))
#define little4(ptr) (little2(ptr) + ((unsigned long)(little2(ptr + 2)) << 16))
/* find and return a specific extra block in an extra field */
local int getblock(unsigned id, unsigned char *extra, unsigned xlen,
unsigned char **block, unsigned *len)
{
unsigned thisid, size;
/* scan extra blocks */
while (xlen) {
/* get extra block id and data size */
if (xlen < 4)
return 0; /* invalid block */
thisid = little2(extra);
size = little2(extra + 2);
extra += 4;
xlen -= 4;
if (xlen < size)
return 0; /* invalid block */
/* check for requested id */
if (thisid == id) {
*block = extra;
*len = size;
return 1; /* got it! */
}
/* go to the next block */
extra += size;
xlen -= size;
}
return 0; /* wasn't there */
}
/* extract Unix access and modification times from extra field */
local void xtimes(unsigned char *extra, unsigned xlen, long *acc, long *mod)
{
unsigned len;
unsigned char *block;
/* process Extended Timestamp block */
if (getblock(0x5455, extra, xlen, &block, &len) && len &&
(*block & 1) == 1 && len >= ((unsigned)(*block & 2) << 1) + 5) {
*mod = tolong(little4(block + 1));
*acc = *block & 2 ? tolong(little4(block + 5)) : *mod;
return;
}
/* process PKWare Unix or Info-ZIP Type 1 Unix block */
if ((getblock(0x5855, extra, xlen, &block, &len) ||
getblock(0x000d, extra, xlen, &block, &len)) &&
len >= 8) {
*acc = tolong(little4(block));
*mod = tolong(little4(block + 4));
}
}
/* look for a zip64 block in the local header and update lengths, return
true if got 8-byte lengths */
local int zip64local(unsigned char *extra, unsigned xlen,
unsigned long *clen, unsigned long *clen_hi,
unsigned long *ulen, unsigned long *ulen_hi)
{
unsigned len;
unsigned char *block;
/* process zip64 Extended Information block */
if (getblock(0x0001, extra, xlen, &block, &len) && len >= 16) {
*ulen = little4(block);
*ulen_hi = little4(block + 4);
*clen = little4(block + 8);
*clen_hi = little4(block + 12);
return 1; /* got 8-byte lengths */
}
return 0; /* didn't get 8-byte lengths */
}
/* 32-bit marker for presence of 64-bit lengths */
#define LOW4 0xffffffffUL
/* look for a zip64 block in the central header and update offset */
local void zip64central(unsigned char *extra, unsigned xlen,
unsigned long clen, unsigned long ulen,
unsigned long *offset, unsigned long *offset_hi)
{
unsigned len;
unsigned char *block;
/* process zip64 Extended Information block */
if (getblock(0x0001, extra, xlen, &block, &len) && len >= 16) {
if (ulen == LOW4) {
block += 8;
len -= 8;
}
if (clen == LOW4) {
block += 8;
len -= 8;
}
if (len >= 8) {
*offset = little4(block);
*offset_hi = little4(block + 4);
}
}
}
/* look for a UTF-8 name in the central header */
local char *utf8name(unsigned char *extra, unsigned xlen,
unsigned long namecrc, char *name)
{
unsigned len;
unsigned char *block;
/* process and copy utf-8 name, discard old name */
if (getblock(0x7075, extra, xlen, &block, &len) && len > 5 &&
*block == 1 && little4(block + 1) == namecrc) {
free(name);
name = (char *)(block + 5);
tostr(name, len - 5);
name = strnew(name);
}
return name;
}
#ifndef JUST_DEFLATE
/* ----- BZip2 Decompression Operation ----- */
#define BZOUTSIZE 32768U /* passed outbuf better be this big */
/* decompress and write a bzip2 compressed entry */