Glassfish example source code file (zip_util.c)
The Glassfish zip_util.c source code/*
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*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
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* recipient has the option to distribute your version of this file under
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* holder.
*/
/*
* Support for reading ZIP/JAR files.
*/
#include "zip_util.h"
#include "java.h"
#define MAXREFS 0xFFFF /* max number of open zip file references */
#define MAXSIZE INT_MAX /* max size of zip file or zip entry */
static jzfile *zfiles = 0; /* currently open zip files */
static char errbuf[256];
/*
* Initialize zip file support. Return 0 if successful otherwise -1
* if could not be initialized.
*/
static jint initializeZip()
{
extern void out_of_memory(void);
static jboolean inited = JNI_FALSE;
if (inited)
return 0;
inited = JNI_TRUE;
return 0;
}
/*
* Reads len bytes of data into buf. Returns 0 if all bytes could be read,
* otherwise returns -1.
*/
static jint readFully(int fd, void *buf, jint len)
{
unsigned char *bp = buf;
while (len > 0)
{
jint n = read(fd, (char *)bp, len);
if (n <= 0)
return -1;
bp += n;
len -= n;
}
return 0;
}
/*
* Allocates a new zip file object for the specified file name.
* Returns the zip file object or NULL if not enough memory.
*/
static jzfile *allocZip(const char *name)
{
jzfile *zip = calloc(1, sizeof(jzfile));
if (zip == 0)
return 0;
zip->name = strdup(name);
if (zip->name == 0)
{
free(zip);
return 0;
}
return zip;
}
/*
* Frees the specified zip file object.
*/
static void freeZip(jzfile *zip)
{
int i;
/* First free any cached jzentry */
zipFreeEntry(zip,0);
if (zip->name != 0)
free(zip->name);
if (zip->comment != 0)
free(zip->comment);
if (zip->entries != 0)
free(zip->entries);
if (zip->table != 0)
free(zip->table);
if (zip->metanames != 0)
{
for (i = 0; i < zip->metacount; i++)
{
if (zip->metanames[i])
free(zip->metanames[i]);
}
free(zip->metanames);
}
if (zip->comments != 0)
{
for (i = 0; i < zip->total; i++)
{
if (zip->comments[i])
free(zip->comments[i]);
}
free(zip->comments);
}
free(zip);
}
/*
* Searches for end of central directory (END) header. The contents of
* the END header will be read and placed in endbuf. Returns the file
* position of the END header, otherwise returns 0 if the END header
* was not found or -1 if an error occurred.
*/
static jint findEND(jzfile *zip, void *endbuf)
{
unsigned char buf[ENDHDR * 2];
jint len, pos;
int fd = zip->fd;
/* Get the length of the zip file */
len = pos = lseek(fd, 0, SEEK_END);
if (len == -1)
return -1;
/*
* Search backwards ENDHDR bytes at a time from end of file stopping
* when the END header has been found. We need to make sure that we
* handle the case where the signature may straddle a record boundary.
* Also, the END header must be located within the last 64k bytes of
* the file since that is the maximum comment length.
*/
memset(buf, 0, sizeof(buf));
while (len - pos < 0xFFFF)
{
unsigned char *bp;
/* Number of bytes to check in next block */
int count = 0xFFFF - (len - pos);
if (count > ENDHDR)
count = ENDHDR;
/* Shift previous block */
memcpy(buf + count, buf, count);
/* Update position and read next block */
pos -= count;
if (lseek(fd, pos, SEEK_SET) == -1)
return -1;
if (readFully(fd, buf, count) == -1)
return -1;
/* Now scan the block for END header signature */
for (bp = buf; bp < buf + count; bp++)
{
if (GETSIG(bp) == ENDSIG)
{
/* Check for possible END header */
jint endpos = pos + (bp - buf);
jint clen = ENDCOM(bp);
if (endpos + ENDHDR + clen == len)
{
/* Found END header */
memcpy(endbuf, bp, ENDHDR);
if (lseek(fd, endpos + ENDHDR, SEEK_SET) == -1)
return -1;
if (clen > 0)
{
zip->comment = malloc(clen + 1);
if (zip->comment == 0)
return -1;
if (readFully(zip->fd, zip->comment, clen) == -1)
{
free(zip->comment);
zip->comment = 0;
return -1;
}
zip->comment[clen] = '\0';
}
return endpos;
}
}
}
}
return 0; /* END header not found */
}
/*
* Returns a hash code value for the specified string.
*/
static unsigned int
hash(const char *s)
{
int h = 0;
while (*s != '\0')
h = 31*h + *s++;
return h;
}
/*
* Returns true if the specified entry's name begins with the string
* "META-INF/" irrespect of case.
*/
static int
isMetaName(char *name)
{
#define META_INF "META-INF/"
char *s = META_INF, *t = name;
while (*s != '\0')
{
if (*s++ != (char)toupper(*t++))
return 0;
}
return 1;
}
static void
addMetaName(jzfile *zip, char *name)
{
int i;
if (zip->metanames == 0)
{
zip->metacount = 2;
zip->metanames = calloc(zip->metacount, sizeof(char *));
}
for (i = 0; i < zip->metacount; i++)
{
if (zip->metanames[i] == 0)
{
zip->metanames[i] = strdup(name);
break;
}
}
/* If necessary, grow the metanames array */
if (i >= zip->metacount)
{
int new_count = 2 * zip->metacount;
char **tmp = calloc(new_count, sizeof(char *));
for (i = 0; i < zip->metacount; i++)
tmp[i] = zip->metanames[i];
tmp[i] = strdup(name);
free(zip->metanames);
zip->metanames = tmp;
zip->metacount = new_count;
}
}
static void
addEntryComment(jzfile *zip, int index, char *comment)
{
if (zip->comments == NULL)
zip->comments = calloc(zip->total, sizeof(char *));
zip->comments[index] = comment;
}
/*
* Reads zip file central directory. Returns the file position of first
* CEN header, otherwise returns 0 if central directory not found or -1
* if an error occurred. If zip->msg != NULL then the error was a zip
* format error and zip->msg has the error text.
*/
static
jint readCEN(jzfile *zip)
{
jint endpos, locpos, cenpos, cenoff, cenlen;
jint total, count, tablelen, i, tmplen;
unsigned char endbuf[ENDHDR], *cenbuf, *cp;
jzcell *entries;
unsigned short *table;
char namebuf[ZIP_TYPNAMELEN + 1];
char* name = namebuf;
int namelen = ZIP_TYPNAMELEN + 1;
/* Clear previous zip error */
zip->msg = 0;
/* Get position of END header */
endpos = findEND(zip, endbuf);
if (endpos == 0)
return 0; /* END header not found */
if (endpos == -1)
return -1; /* system error */
/* Get position and length of central directory */
cenlen = ENDSIZ(endbuf);
if (cenlen < 0 || cenlen > endpos)
{
zip->msg = "invalid END header (bad central directory size)";
return -1;
}
cenpos = endpos - cenlen;
/*
* Get position of first local file (LOC) header, taking into
* account that there maybe a stub prefixed to the zip file.
*/
cenoff = ENDOFF(endbuf);
if (cenoff < 0 || cenoff > cenpos)
{
zip->msg = "invalid END header (bad central directory offset)";
return -1;
}
locpos = cenpos - cenoff;
/* Get total number of central directory entries */
total = zip->total = ENDTOT(endbuf);
if (total < 0 || total * CENHDR > cenlen)
{
zip->msg = "invalid END header (bad entry count)";
return -1;
}
if (total > ZIP_MAXENTRIES)
{
zip->msg = "too many entries in ZIP file";
return -1;
}
/* Seek to first CEN header */
if (lseek(zip->fd, cenpos, SEEK_SET) == -1)
return -1;
/* Allocate temporary buffer for central directory bytes */
cenbuf = malloc(cenlen);
if (cenbuf == 0)
return -1;
/* Read central directory */
if (readFully(zip->fd, cenbuf, cenlen) == -1)
{
free(cenbuf);
return -1;
}
/* Allocate array for item descriptors */
entries = zip->entries = calloc(total, sizeof(jzcell));
if (entries == 0)
{
free(cenbuf);
return -1;
}
/* Allocate hash table */
tmplen = total/2;
tablelen = zip->tablelen = (tmplen > 0 ? tmplen : 1);
table = zip->table = calloc(tablelen, sizeof(unsigned short));
if (table == 0)
{
free(cenbuf);
free(entries);
zip->entries = 0;
return -1;
}
for (i = 0; i < tablelen; i++)
table[i] = ZIP_ENDCHAIN;
/* Now read the zip file entries */
for (count = 0, cp = cenbuf; count < total; count++)
{
jzcell *zc = &entries[count];
int method, nlen, clen, elen, hsh;
/* Check CEN header looks OK */
if ((cp - cenbuf) + CENHDR > cenlen)
{
zip->msg = "invalid CEN header (bad header size)";
break;
}
/* Verify CEN header signature */
if (GETSIG(cp) != CENSIG)
{
zip->msg = "invalid CEN header (bad signature)";
break;
}
/* Check if entry is encrypted */
if ((CENVER(cp) & 1) == 1)
{
zip->msg = "invalid CEN header (encrypted entry)";
break;
}
method = CENHOW(cp);
if (method != STORED && method != DEFLATED)
{
zip->msg = "invalid CEN header (bad compression method)";
break;
}
/* Get header field lengths */
nlen = CENNAM(cp);
elen = CENEXT(cp);
clen = CENCOM(cp);
if ((cp - cenbuf) + CENHDR + nlen + clen + elen > cenlen)
{
zip->msg = "invalid CEN header (bad header size)";
break;
}
zc->size = CENLEN(cp);
zc->csize = CENSIZ(cp);
zc->crc = CENCRC(cp);
/* Set compressed size to zero if entry uncompressed */
if (method == STORED)
zc->csize = 0;
/*
* Copy the name into a temporary location so we can null
* terminate it (sigh) as various functions expect this.
*/
if (namelen < nlen + 1)
{
/* grow temp buffer */
do
namelen = namelen * 2;
while (namelen < nlen + 1);
if (name != namebuf) /* free malloc()ated buffer */
free(name);
name = malloc(namelen);
}
memcpy(name, cp+CENHDR, nlen);
name[nlen] = 0;
/*
* Record the LOC offset and the name hash in our hash cell.
*/
zc->pos = CENOFF(cp) + locpos;
zc->nelen = nlen + elen;
zc->hash = hash(name);
zc->cenpos = cenpos + (cp - cenbuf);
zc->elen = elen;
/*
* if the entry is metdata add it to our metadata names
*/
if (isMetaName(name))
addMetaName(zip, name);
/*
* If there is a comment add it to our comments array.
*/
if (clen > 0)
{
char *comment = malloc(clen+1);
memcpy(comment, cp+CENHDR+nlen+elen, clen);
comment[clen] = 0;
addEntryComment(zip, count, comment);
}
/*
* Finally we can add the entry to the hash table
*/
hsh = zc->hash % tablelen;
zc->next = table[hsh];
table[hsh] = count;
cp += (CENHDR + nlen + elen + clen);
}
/* Free up temporary buffers */
free(cenbuf);
if (name != namebuf)
free(name);
/* Check for error */
if (count != total)
{
/* Central directory was invalid, so free up entries and return */
free(entries);
zip->entries = 0;
free(table);
zip->table = 0;
return -1;
}
return cenpos;
}
/*
* Opens a zip file with the specified mode. Returns the jzfile object
* or NULL if an error occurred. If a zip error occurred then *msg will
* or NULL if an error occurred. If a zip error occurred then *zerror will be
* set to the error number. Otherwise, *zerror will be set to Z_OK.
*/
jzfile *
zipOpenGeneric(const char *name, int *zerror, int mode, jlong lastModified)
{
jzfile *zip;
if (initializeZip())
return NULL;
/* Clear zip error message */
if (zerror != 0)
*zerror = Z_OK;
for (zip = zfiles; zip != 0; zip = zip->next)
{
if (strcmp(name, zip->name) == 0
&& (zip->lastModified == lastModified || zip->lastModified == 0)
&& zip->refs < MAXREFS)
{
zip->refs++;
break;
}
}
if (zip == 0)
{
jlong len;
/* If not found then allocate a new zip object */
zip = allocZip(name);
if (zip == 0)
return 0;
zip->refs = 1;
zip->lastModified = lastModified;
zip->fd = open(name, mode);
if (!zip->fd)
{
if (zerror != 0)
*zerror = Z_MEM_ERROR;
freeZip(zip);
return 0;
}
len = lseek(zip->fd, 0, SEEK_END);
if (len == -1)
{
if (zerror != 0)
*zerror = Z_STREAM_ERROR;
close(zip->fd);
freeZip(zip);
return 0;
}
if (len > MAXSIZE)
{
if (zerror != 0)
*zerror = Z_STREAM_ERROR;
close(zip->fd);
freeZip(zip);
return 0;
}
if (readCEN(zip) <= 0)
{
/* An error occurred while trying to read the zip file */
if (zerror != 0)
*zerror = Z_STREAM_ERROR;
close(zip->fd);
freeZip(zip);
return 0;
}
zip->next = zfiles;
zfiles = zip;
}
return zip;
}
/*
* Opens a zip file for reading. Returns the jzfile object or NULL
* if an error occurred. If a zip error occurred then *zerror will be
* set to the error number. Otherwise, *zerror will be set to Z_OK.
*/
jzfile *
zipOpen(const char *name, int *zerror)
{
#ifdef WIN32
int mode = O_RDONLY | O_BINARY;
#else
int mode = O_RDONLY;
#endif
return zipOpenGeneric(name, zerror, mode, 0);
}
/*
* Closes the specified zip file object.
*/
void zipClose(jzfile *zip)
{
if (--zip->refs > 0)
{
/* Still more references so just return */
return;
}
/* No other references so close the file and remove from list */
if (zfiles == zip)
{
zfiles = zfiles->next;
}
else
{
jzfile *zp;
for (zp = zfiles; zp->next != 0; zp = zp->next)
{
if (zp->next == zip)
{
zp->next = zip->next;
break;
}
}
}
close(zip->fd);
freeZip(zip);
return;
}
/*
* Read a LOC corresponding to a given hash cell and
* create a corrresponding jzentry entry descriptor
* The ZIP lock should be held here.
*/
static jzentry *
readLOC(jzfile *zip, jzcell *zc)
{
unsigned char *locbuf;
jint nelen = zc->nelen;
jint nlen, elen;
jzentry *ze;
/* Seek to beginning of LOC header */
if (lseek(zip->fd, zc->pos, SEEK_SET) == -1)
{
zip->msg = "seek failed";
return NULL;
}
locbuf = malloc(LOCHDR + nelen);
/* Try to read in the LOC header including the name and extra data */
if (readFully(zip->fd, locbuf, LOCHDR+nelen) == -1)
{
zip->msg = "couldn't read LOC header";
free(locbuf);
return NULL;
}
/* Verify signature */
if (GETSIG(locbuf) != LOCSIG)
{
zip->msg = "invalid LOC header (bad signature)";
free(locbuf);
return NULL;
}
/* verify lengths */
nlen = LOCNAM(locbuf);
elen = LOCEXT(locbuf);
ze = calloc(1, sizeof(jzentry));
ze->name = malloc(nlen + 1);
memcpy(ze->name, locbuf+LOCHDR, nlen);
ze->name[nlen] = 0;
/* If extra in CEN, use it instead of extra in LOC */
if (zc->elen > 0)
{
int off = CENHDR + zc->nelen - zc->elen + zc->cenpos;
elen = zc->elen;
ze->extra = malloc(elen+2);
ze->extra[0] = (unsigned char)elen;
ze->extra[1] = (unsigned char)(elen >> 8);
/* Seek to begin of CEN header extra field */
if (lseek(zip->fd, off, SEEK_SET) == -1)
{
zip->msg = "seek failed";
free(locbuf);
return NULL;
}
/* Try to read in the CEN Extra */
if (readFully(zip->fd, &ze->extra[2], elen) == -1)
{
zip->msg = "couldn't read CEN extra";
free(locbuf);
return NULL;
}
}
else if (LOCEXT(locbuf) != 0)
{
ze->extra = malloc(elen + 2);
/* Store the extra data size in the first two bytes */
ze->extra[0] = (unsigned char)elen;
ze->extra[1] = (unsigned char)(elen >> 8);
memcpy(&ze->extra[2], locbuf+LOCHDR+nlen, elen);
}
/*
* Process any comment (this should be very rare)
*/
if (zip->comments)
{
int index = zc - zip->entries;
ze->comment = zip->comments[index];
}
/*
* We'd like to initialize the sizes from the LOC, but unfortunately
* some ZIPs, including the jar command, don't put them there.
* So we have to store them in the szcell.
*/
ze->size = zc->size;
ze->csize = zc->csize;
ze->crc = zc->crc;
/* Fill in the rest of the entry fields from the LOC */
ze->time = LOCTIM(locbuf);
ze->pos = zc->pos + LOCHDR + LOCNAM(locbuf) + LOCEXT(locbuf);
free(locbuf);
return ze;
}
/*
* Free the given jzentry.
* In fact we maintain a one-entry cache of the most recently used
* jzentry for each zip. This optimizes a common access pattern.
*/
void
zipFreeEntry(jzfile *jz, jzentry *ze)
{
jzentry *last;
last = jz->cache;
jz->cache = ze;
if (last != NULL)
{
/* Free the previously cached jzentry */
if (last->extra)
free(last->extra);
if (last->name)
free(last->name);
free(last);
}
}
/*
* Returns the zip entry corresponding to the specified name, or
* NULL if not found.
*/
jzentry * zipGetEntry(jzfile *zip, const char *name)
{
unsigned int hsh = hash(name);
int idx = zip->table[hsh % zip->tablelen];
jzentry *ze;
/* Check the cached entry first */
ze = zip->cache;
if (ze && strcmp(ze->name,name) == 0)
{
/* Cache hit! Remove and return the cached entry. */
zip->cache = 0;
return ze;
}
ze = 0;
/*
* Search down the target hash chain for a cell who's
* 32 bit hash matches the hashed name.
*/
while (idx != ZIP_ENDCHAIN)
{
jzcell *zc = &zip->entries[idx];
if (zc->hash == hsh)
{
/*
* OK, we've found a ZIP entry whose 32 bit hashcode
* matches the name we're looking for. Try to read its
* entry information from the LOC.
* If the LOC name matches the name we're looking,
* we're done.
* If the names don't (which should be very rare) we
* keep searching.
*/
ze = readLOC(zip, zc);
if (ze && strcmp(ze->name, name)==0)
break;
if (ze != 0)
zipFreeEntry(zip, ze);
ze = 0;
}
idx = zc->next;
}
return ze;
}
/*
* Returns the n'th (starting at zero) zip file entry, or NULL if the
* specified index was out of range.
*/
jzentry *
zipGetNextEntry(jzfile *zip, jint n)
{
jzentry *result;
if (n < 0 || n >= zip->total)
return 0;
result = readLOC(zip, &zip->entries[n]);
return result;
}
/*
* Reads bytes from the specified zip entry. Returns the
* number of bytes read, or -1 if an error occurred. If err->msg != 0
* then a zip error occurred and err->msg contains the error text.
*/
jint zipRead(jzfile *zip, jzentry *entry, jint pos, void *buf, jint len)
{
jint n, avail, size;
/* Clear previous zip error */
zip->msg = 0;
/* Check specified position */
size = entry->csize != 0 ? entry->csize : entry->size;
if (pos < 0 || pos > size - 1)
{
zip->msg = "zipRead: specified offset out of range";
return -1;
}
/* Check specified length */
if (len <= 0)
return 0;
avail = size - pos;
if (len > avail)
len = avail;
/* Seek to beginning of entry data and read bytes */
n = lseek(zip->fd, entry->pos + pos, SEEK_SET);
if (n != -1)
n = read(zip->fd, buf, len);
return n;
}
/* The maximum size of a stack-allocated buffer.
*/
#define BUF_SIZE 4096
/*
* This function is used by the runtime system to load compressed entries
* from ZIP/JAR files specified in the class path. It is defined here
* so that it can be dynamically loaded by the runtime if the zip library
* is found.
*/
static jboolean
inflateFully(jzfile *zip, jzentry *entry, int fd, char **msg)
{
z_stream strm;
char tmp[BUF_SIZE];
unsigned char buf[BUF_SIZE * 4];
jint pos = 0, count = entry->csize;
*msg = 0; /* Reset error message */
if (count == 0)
{
*msg = "inflateFully: entry not compressed";
return JNI_FALSE;
}
memset(&strm, 0, sizeof(z_stream));
if (inflateInit2(&strm, -MAX_WBITS) != Z_OK)
{
*msg = strm.msg;
return JNI_FALSE;
}
while (count > 0)
{
jint n = count > (jint)sizeof(tmp) ? (jint)sizeof(tmp) : count;
n = zipRead(zip, entry, pos, tmp, n);
if (n <= 0)
{
if (n == 0)
*msg = "inflateFully: Unexpected end of file";
inflateEnd(&strm);
return JNI_FALSE;
}
pos += n;
count -= n;
strm.next_in = (Bytef *)tmp;
strm.avail_in = n;
do
{
strm.next_out = buf;
strm.avail_out = sizeof(buf);
if (inflate(&strm, Z_PARTIAL_FLUSH) == Z_STREAM_END)
{
if (count != 0 || strm.total_out != entry->size)
{
*msg = "inflateFully: Unexpected end of stream";
inflateEnd(&strm);
return JNI_FALSE;
}
}
if (write(fd, buf, sizeof(buf) - strm.avail_out) != sizeof(buf) - strm.avail_out)
{
inflateEnd(&strm);
return JNI_FALSE;
}
} while (strm.avail_in > 0 || !strm.avail_out);
}
inflateEnd(&strm);
return JNI_TRUE;
}
jzentry *
zipFindEntry(jzfile *zip, const char *name, jint *sizeP, jint *nameLenP)
{
jzentry *entry = zipGetEntry(zip, name);
if (entry)
{
*sizeP = entry->size;
*nameLenP = strlen(entry->name);
}
return entry;
}
/*
* Reads a zip file entry into the specified byte array into the specified
* file.
*/
jboolean
zipReadEntry(jzfile *zip, jzentry *entry, const char *path)
{
char *msg;
int fd;
#ifdef WIN32
if ((fd = open(path, O_WRONLY | O_CREAT | O_BINARY, _S_IREAD | _S_IWRITE)) < 0)
#else
if ((fd = open(path, O_WRONLY | O_CREAT, S_IRWXU)) < 0)
#endif
{
msg = "zipReadEntry: cannot open output file";
return JNI_FALSE;
}
if (entry->csize == 0)
{
/* Entry is stored */
jint pos = 0, count = entry->size;
unsigned char buf[BUF_SIZE * 4];
while (count > 0)
{
jint n;
n = zipRead(zip, entry, pos, buf, count > sizeof(buf) ? sizeof(buf) : count);
msg = zip->msg;
if (n == -1 || write(fd, buf, n) != n)
{
close(fd);
return JNI_FALSE;
}
pos += n;
count -= n;
}
}
else
{
/* Entry is compressed */
int ok = inflateFully(zip, entry, fd, &msg);
if (!ok)
{
if ((msg == NULL) || (*msg == 0))
msg = zip->msg;
close(fd);
return JNI_FALSE;
}
}
close(fd);
return JNI_TRUE;
}
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