diff options
Diffstat (limited to 'src/io.c')
| -rw-r--r-- | src/io.c | 36 |
1 files changed, 36 insertions, 0 deletions
@@ -12,6 +12,7 @@ #include <errno.h> #include <stdio.h> #include <fcntl.h> +#include <endian.h> #include <unistd.h> #include <malloc.h> #include <dirent.h> @@ -529,6 +530,41 @@ int apk_blob_to_file(int atfd, const char *file, apk_blob_t b, unsigned int flag return r; } +static int cmp_xattr(const void *p1, const void *p2) +{ + const struct apk_xattr *d1 = p1, *d2 = p2; + return strcmp(d1->name, d2->name); +} + +static void hash_len_data(EVP_MD_CTX *ctx, uint32_t len, const void *ptr) +{ + uint32_t belen = htobe32(len); + EVP_DigestUpdate(ctx, &belen, sizeof(belen)); + EVP_DigestUpdate(ctx, ptr, len); +} + +void apk_fileinfo_hash_xattr(struct apk_file_info *fi) +{ + struct apk_xattr *xattr; + const EVP_MD *md = apk_checksum_default(); + EVP_MD_CTX mdctx; + + if (!fi->xattrs || fi->xattrs->num == 0) { + fi->xattr_csum.type = APK_CHECKSUM_NONE; + return; + } + + qsort(fi->xattrs->item, fi->xattrs->num, sizeof(fi->xattrs->item[0]), cmp_xattr); + + EVP_DigestInit(&mdctx, md); + foreach_array_item(xattr, fi->xattrs) { + hash_len_data(&mdctx, strlen(xattr->name), xattr->name); + hash_len_data(&mdctx, xattr->value.len, xattr->value.ptr); + } + fi->xattr_csum.type = EVP_MD_CTX_size(&mdctx); + EVP_DigestFinal(&mdctx, fi->xattr_csum.data, NULL); +} + int apk_fileinfo_get(int atfd, const char *filename, unsigned int flags, struct apk_file_info *fi) { |