1 files changed, 38 insertions, 0 deletions

diff --git a/fake-msi.c b/fake-msi.c
index 2ceab99..92c24e3 100644
--- a/fake-msi.c
+++ b/fake-msi.c
@@ -193,6 +193,44 @@ uint32_t MsiGetFileVersionW(const char16_t *filename,
     sfree(fname);
     return toret;
 }
+
+struct MsiHash {
+    uint32_t structure_size;
+    uint32_t hash_words[4];
+};
+
+uint32_t MsiGetFileHashW(const char16_t *filename, uint32_t options,
+                         struct MsiHash *hash)
+{
+    char *fname = ascii(filename, true);
+    int fd = -1;
+    void *mapv = MAP_FAILED;
+    uint32_t toret;
+
+    fd = open(fname, O_RDONLY);
+    if (fd < 0)
+        err(1, "%s: open", fname);
+    struct stat st;
+    if (fstat(fd, &st) < 0)
+        err(1, "%s: fstat", fname);
+    size_t fsize = st.st_size;
+    mapv = mmap(NULL, fsize, PROT_READ, MAP_PRIVATE, fd, 0);
+    if (mapv == MAP_FAILED)
+        err(1, "%s: mmap", fname);
+
+    MD5Simple(mapv, fsize, hash->hash_words);
+    warnx("MsiGetFileHash(%s) -> %08x:%08x:%08x:%08x", fname,
+          (unsigned)hash->hash_words[0], (unsigned)hash->hash_words[1],
+          (unsigned)hash->hash_words[2], (unsigned)hash->hash_words[3]);
+    toret = 0;
+
+  cleanup:
+    if (mapv != MAP_FAILED)
+        munmap(mapv, fsize);
+    if (fd != -1)
+        close(fd);
+    sfree(fname);
+    return toret;
 }
 
 typedef struct MsiTypePrefix {