rename archival/libunarchive -> archival/libarchive; move bz/ into it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 186 insertions, 0 deletions

diff --git a/archival/libarchive/get_header_cpio.c b/archival/libarchive/get_header_cpio.c
new file mode 100644
index 000000000..3d99b492a
--- /dev/null
+++ b/archival/libarchive/get_header_cpio.c
@@ -0,0 +1,186 @@
+/* vi: set sw=4 ts=4: */
+/* Copyright 2002 Laurence Anderson
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "archive.h"
+
+typedef struct hardlinks_t {
+        struct hardlinks_t *next;
+        int inode; /* TODO: must match maj/min too! */
+        int mode ;
+        int mtime; /* These three are useful only in corner case */
+        int uid  ; /* of hardlinks with zero size body */
+        int gid  ;
+        char name[1];
+} hardlinks_t;
+
+char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
+{
+        file_header_t *file_header = archive_handle->file_header;
+        char cpio_header[110];
+        int namesize;
+        int major, minor, nlink, mode, inode;
+        unsigned size, uid, gid, mtime;
+
+        /* There can be padding before archive header */
+        data_align(archive_handle, 4);
+
+        size = full_read(archive_handle->src_fd, cpio_header, 110);
+        if (size == 0) {
+                goto create_hardlinks;
+        }
+        if (size != 110) {
+                bb_error_msg_and_die("short read");
+        }
+        archive_handle->offset += 110;
+
+        if (strncmp(&cpio_header[0], "07070", 5) != 0
+         || (cpio_header[5] != '1' && cpio_header[5] != '2')
+        ) {
+                bb_error_msg_and_die("unsupported cpio format, use newc or crc");
+        }
+
+        if (sscanf(cpio_header + 6,
+                        "%8x" "%8x" "%8x" "%8x"
+                        "%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
+                        /*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
+                        &inode, &mode, &uid, &gid,
+                        &nlink, &mtime, &size,
+                        &major, &minor, &namesize) != 10)
+                bb_error_msg_and_die("damaged cpio file");
+        file_header->mode = mode;
+        file_header->uid = uid;
+        file_header->gid = gid;
+        file_header->mtime = mtime;
+        file_header->size = size;
+
+        namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
+        file_header->name = xzalloc(namesize + 1);
+        /* Read in filename */
+        xread(archive_handle->src_fd, file_header->name, namesize);
+        if (file_header->name[0] == '/') {
+                /* Testcase: echo /etc/hosts | cpio -pvd /tmp
+                 * Without this code, it tries to unpack /etc/hosts
+                 * into "/etc/hosts", not "etc/hosts".
+                 */
+                char *p = file_header->name;
+                do p++; while (*p == '/');
+                overlapping_strcpy(file_header->name, p);
+        }
+        archive_handle->offset += namesize;
+
+        /* Update offset amount and skip padding before file contents */
+        data_align(archive_handle, 4);
+
+        if (strcmp(file_header->name, "TRAILER!!!") == 0) {
+                /* Always round up. ">> 9" divides by 512 */
+                archive_handle->cpio__blocks = (uoff_t)(archive_handle->offset + 511) >> 9;
+                goto create_hardlinks;
+        }
+
+        file_header->link_target = NULL;
+        if (S_ISLNK(file_header->mode)) {
+                file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
+                file_header->link_target = xzalloc(file_header->size + 1);
+                xread(archive_handle->src_fd, file_header->link_target, file_header->size);
+                archive_handle->offset += file_header->size;
+                file_header->size = 0; /* Stop possible seeks in future */
+        }
+
+// TODO: data_extract_all can't deal with hardlinks to non-files...
+// when fixed, change S_ISREG to !S_ISDIR here
+
+        if (nlink > 1 && S_ISREG(file_header->mode)) {
+                hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
+                new->inode = inode;
+                new->mode  = mode ;
+                new->mtime = mtime;
+                new->uid   = uid  ;
+                new->gid   = gid  ;
+                strcpy(new->name, file_header->name);
+                /* Put file on a linked list for later */
+                if (size == 0) {
+                        new->next = archive_handle->cpio__hardlinks_to_create;
+                        archive_handle->cpio__hardlinks_to_create = new;
+                        return EXIT_SUCCESS; /* Skip this one */
+                        /* TODO: this breaks cpio -t (it does not show hardlinks) */
+                }
+                new->next = archive_handle->cpio__created_hardlinks;
+                archive_handle->cpio__created_hardlinks = new;
+        }
+        file_header->device = makedev(major, minor);
+
+        if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+                archive_handle->action_data(archive_handle);
+//TODO: run "echo /etc/hosts | cpio -pv /tmp" twice. On 2nd run:
+//cpio: etc/hosts not created: newer or same age file exists
+//etc/hosts  <-- should NOT show it
+//2 blocks <-- should say "0 blocks"
+                archive_handle->action_header(file_header);
+        } else {
+                data_skip(archive_handle);
+        }
+
+        archive_handle->offset += file_header->size;
+
+        free(file_header->link_target);
+        free(file_header->name);
+        file_header->link_target = NULL;
+        file_header->name = NULL;
+
+        return EXIT_SUCCESS;
+
+ create_hardlinks:
+        free(file_header->link_target);
+        free(file_header->name);
+
+        while (archive_handle->cpio__hardlinks_to_create) {
+                hardlinks_t *cur;
+                hardlinks_t *make_me = archive_handle->cpio__hardlinks_to_create;
+
+                archive_handle->cpio__hardlinks_to_create = make_me->next;
+
+                memset(file_header, 0, sizeof(*file_header));
+                file_header->mtime = make_me->mtime;
+                file_header->name = make_me->name;
+                file_header->mode = make_me->mode;
+                file_header->uid = make_me->uid;
+                file_header->gid = make_me->gid;
+                /*file_header->size = 0;*/
+                /*file_header->link_target = NULL;*/
+
+                /* Try to find a file we are hardlinked to */
+                cur = archive_handle->cpio__created_hardlinks;
+                while (cur) {
+                        /* TODO: must match maj/min too! */
+                        if (cur->inode == make_me->inode) {
+                                file_header->link_target = cur->name;
+                                 /* link_target != NULL, size = 0: "I am a hardlink" */
+                                if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+                                        archive_handle->action_data(archive_handle);
+                                free(make_me);
+                                goto next_link;
+                        }
+                        cur = cur->next;
+                }
+                /* Oops... no file with such inode was created... do it now
+                 * (happens when hardlinked files are empty (zero length)) */
+                if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
+                        archive_handle->action_data(archive_handle);
+                /* Move to the list of created hardlinked files */
+                make_me->next = archive_handle->cpio__created_hardlinks;
+                archive_handle->cpio__created_hardlinks = make_me;
+ next_link: ;
+        }
+
+        while (archive_handle->cpio__created_hardlinks) {
+                hardlinks_t *p = archive_handle->cpio__created_hardlinks;
+                archive_handle->cpio__created_hardlinks = p->next;
+                free(p);
+        }
+
+        return EXIT_FAILURE; /* "No more files to process" */
+}