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#include <kmi/utils.h>
/** GNU cpio, POSIX 'newc' format header. */
struct __packed cpio_header {
/** Magic bytes. */
char c_magic[6];
/** File inode. */
char c_ino[8];
/** File type and permissions. */
char c_mode[8];
/** User ID. */
char c_uid[8];
/** Group ID. */
char c_gid[8];
/** Number of links to this file. */
char c_nlink[8];
/** Modification time. */
char c_mtime[8];
/** Size of file. */
char c_filesize[8];
/** Device major. */
char c_devmajor[8];
/** Device minor. */
char c_devminor[8];
/** Block device major. */
char c_rdevmajor[8];
/** Block device minor. */
char c_rdevminor[8];
/** Length of filename. */
char c_namesize[8];
/** CRC check. */
char c_check[8];
};
/**
* Get next file in archive.
* Does not check for out of bounds.
*
* @param cp Pointer to current file header.
* @return Pointer to next file header.
*/
static inline struct cpio_header *cpio_next_entry(struct cpio_header *cp)
{
size_t blen = align_up(sizeof(struct cpio_header)
+ convnum(cp->c_namesize, 8, 16), 4);
size_t tlen = align_up(convnum(cp->c_filesize, 8, 16), 4);
return (struct cpio_header *)(((char *)cp) + blen + tlen);
}
/**
* Get file with name in archive.
*
* @param c Pointer to initrd.
* @param fname Filename to look for.
* @param fname_len Length of filename.
* @return Pointer to corresponding file header if found, \c NULL otherwise.
*/
static inline struct cpio_header *cpio_find_file(const char *c,
const char *fname,
size_t fname_len)
{
struct cpio_header *cp = (struct cpio_header *)c;
for (; cp; cp = cpio_next_entry(cp)) {
size_t namelen = convnum(cp->c_namesize, 8, 16);
if (namelen == 0)
return NULL;
if (namelen < fname_len)
continue;
char *name = (char *)(cp + 1);
if (strcmp(name, "TRAILER!!!") == 0)
return NULL;
if (fname[0] != '/')
name += namelen - (fname_len + 1); /* match ending */
if (strncmp(name, fname, fname_len) == 0)
return cp;
}
printf("???\n");
return NULL;
}
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