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;
}
/*
* Closes the specified zip file object.
*/
void JNICALL
ZIP_Close(jzfile *zip)
{
MLOCK(zfiles_lock);
if (--zip->refs > 0) {
/* Still more references so just return */
MUNLOCK(zfiles_lock);
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;
}
}
}
MUNLOCK(zfiles_lock);
freeZip(zip);
return;
}
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;
}