jzfile *
ZIP_Put_In_Cache0(const char *name, ZFILE zfd, char **pmsg, jlong lastModified,
jboolean usemmap)
{
static char errbuf[256];
jlong len;
jzfile *zip;
if ((zip = allocZip(name)) == NULL) {
return NULL;
}
#ifdef USE_MMAP
zip->usemmap = usemmap;
#endif
zip->refs = 1;
zip->lastModified = lastModified;
if (zfd == -1) {
if (pmsg && JVM_GetLastErrorString(errbuf, sizeof(errbuf)) > 0)
*pmsg = errbuf;
freeZip(zip);
return NULL;
}
len = zip->len = IO_Lseek(zfd, 0, SEEK_END); //获取当前jar/zip文件的长度
if (len <= 0) {
if (len == 0) { /* zip file is empty */
if (pmsg) {
*pmsg = "zip file is empty";
}
} else { /* error */
if (pmsg && JVM_GetLastErrorString(errbuf, sizeof(errbuf)) > 0)
*pmsg = errbuf;
}
ZFILE_Close(zfd);
freeZip(zip);
return NULL;
}
zip->zfd = zfd; //当前jar/zip文件的文件描述符
if (readCEN(zip, -1) < 0) {
/* An error occurred while trying to read the zip file */
if (pmsg != 0) {
/* Set the zip error message */
*pmsg = zip->msg;
}
freeZip(zip);
return NULL;
}
MLOCK(zfiles_lock);
zip->next = zfiles;
zfiles = zip;
MUNLOCK(zfiles_lock);
return zip;
}
/*
* Frees all native resources owned by the specified zip file object.
*/
static void
freeZip(jzfile *zip)
{
/* First free any cached jzentry */
ZIP_FreeEntry(zip,0);
if (zip->lock != NULL) MDESTROY(zip->lock);
free(zip->name);
freeCEN(zip);
#ifdef USE_MMAP
if (zip->maddr != NULL) munmap((char *)zip->maddr, zip->mlen);
#else
free(zip->cencache.data);
#endif
if (zip->comment != NULL)
free(zip->comment);
if (zip->zfd != -1) ZFILE_Close(zip->zfd);
free(zip);
}
jzfile *
ZIP_Put_In_Cache0(const char *name, ZFILE zfd, char **pmsg, jlong lastModified,
jboolean usemmap)
{
char errbuf[256];
jlong len;
jzfile *zip;
if ((zip = allocZip(name)) == NULL) {
return NULL;
}
#ifdef USE_MMAP
zip->usemmap = usemmap;
#endif
zip->refs = 1;
zip->lastModified = lastModified;
if (zfd == -1) {
if (pmsg && getLastErrorString(errbuf, sizeof(errbuf)) > 0)
*pmsg = strdup(errbuf);
freeZip(zip);
return NULL;
}
// Assumption, zfd refers to start of file. Trivially, reuse errbuf.
if (readFully(zfd, errbuf, 4) != -1) { // errors will be handled later
zip->locsig = LOCSIG_AT(errbuf) ? JNI_TRUE : JNI_FALSE;
}
len = zip->len = IO_Lseek(zfd, 0, SEEK_END);
if (len <= 0) {
if (len == 0) { /* zip file is empty */
if (pmsg) {
*pmsg = strdup("zip file is empty");
}
} else { /* error */
if (pmsg && getLastErrorString(errbuf, sizeof(errbuf)) > 0)
*pmsg = strdup(errbuf);
}
ZFILE_Close(zfd);
freeZip(zip);
return NULL;
}
zip->zfd = zfd;
if (readCEN(zip, -1) < 0) {
/* An error occurred while trying to read the zip file */
if (pmsg != 0) {
/* Set the zip error message */
if (zip->msg != NULL)
*pmsg = strdup(zip->msg);
}
freeZip(zip);
return NULL;
}
MLOCK(zfiles_lock);
zip->next = zfiles;
zfiles = zip;
MUNLOCK(zfiles_lock);
return zip;
}
