Implement GUID handling.

[upkg.git] / src / libupkg.c

diff --git a/src/libupkg.c b/src/libupkg.c
index e2bcf2983adb0d614669b763b34d001a5d58d23d..f2addc9447a4ea6105f55572644d3904adf899a1 100644 (file)
--- a/src/libupkg.c
+++ b/src/libupkg.c
@@ -62,7 +62,7 @@ struct upkg_private {
  * Stores the result in *val and returns the number of input bytes read (or 0
  * if the input is invalid, in which case *val is undefined).
  */
-static size_t decode_index(long *val, unsigned char *bytes, size_t n)
+size_t upkg_decode_index(long *val, unsigned char *bytes, size_t n)
 {
        size_t i = 0;
 
@@ -124,6 +124,34 @@ static struct upkg *init_upkg(unsigned char hdr[static UPKG_HDR_SIZE])
        return &alloc->pkg;
 }
 
+static int pkg_init_guid(struct upkg *pkg)
+{
+       size_t rc;
+
+       if (pkg->version < 68) {
+               unsigned long heritage_count, heritage_offset;
+               unsigned char buf[8];
+
+               rc = fread(buf, 1, sizeof buf, pkg->priv->f);
+               if (rc < 8)
+                       return -1;
+
+               heritage_count  = unpack_32_le(buf+0);
+               heritage_offset = unpack_32_le(buf+4);
+
+               if (heritage_count == 0)
+                       return -1;
+               if (fseek(pkg->priv->f, heritage_offset, SEEK_SET) != 0)
+                       return -1;
+       }
+
+       rc = fread(pkg->guid, 1, 16, pkg->priv->f);
+       if (rc < 16)
+               return -1;
+
+       return 0;
+}
+
 static int pkg_init_names(struct upkg *pkg)
 {
        size_t rc, len, nbuf = 0;
@@ -214,11 +242,11 @@ static int pkg_init_exports(struct upkg *pkg)
                }
 
                len = 0;
-               rc = decode_index(&export->class, buf+len, nbuf-len);
+               rc = upkg_decode_index(&export->class, buf+len, nbuf-len);
                if (rc == 0) goto err;
                len += rc;
 
-               rc = decode_index(&export->super, buf+len, nbuf-len);
+               rc = upkg_decode_index(&export->super, buf+len, nbuf-len);
                if (rc == 0) goto err;
                len += rc;
 
@@ -226,7 +254,7 @@ static int pkg_init_exports(struct upkg *pkg)
                export->package = unpack_32_le(buf+len);
                len += 4;
 
-               rc = decode_index(&tmp, buf+len, nbuf-len);
+               rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
                if (rc == 0 || tmp < 0 || tmp >= pkg->name_count) goto err;
                export->name = pkg->priv->names[tmp].name;
                len += rc;
@@ -235,12 +263,12 @@ static int pkg_init_exports(struct upkg *pkg)
                export->flags = unpack_32_le(buf+len);
                len += 4;
 
-               rc = decode_index(&export->size, buf+len, nbuf-len);
+               rc = upkg_decode_index(&export->size, buf+len, nbuf-len);
                if (rc == 0) goto err;
                len += rc;
 
                if (export->size) {
-                       rc = decode_index(&export->offset, buf+len, nbuf-len);
+                       rc = upkg_decode_index(&export->offset, buf+len, nbuf-len);
                        if (rc == 0) goto err;
                        len += rc;
                }
@@ -282,12 +310,12 @@ static int pkg_init_imports(struct upkg *pkg)
                }
 
                len = 0;
-               rc = decode_index(&tmp, buf+len, nbuf-len);
+               rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
                if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
                import->class_package = pkg->priv->names[tmp].name;
                len += rc;
 
-               rc = decode_index(&tmp, buf+len, nbuf-len);
+               rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
                if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
                import->class_name = pkg->priv->names[tmp].name;
                len += rc;
@@ -296,7 +324,7 @@ static int pkg_init_imports(struct upkg *pkg)
                import->package = unpack_32_le(buf+len);
                len += 4;
 
-               rc = decode_index(&tmp, buf+len, nbuf-len);
+               rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
                if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
                import->object_name = pkg->priv->names[tmp].name;
                len += rc;
@@ -335,6 +363,10 @@ struct upkg *upkg_fopen(const char *path)
        }
        pkg->priv->f = f;
 
+       if (pkg_init_guid(pkg) != 0) {
+               goto err2;
+       }
+
        if (pkg_init_names(pkg) != 0) {
                goto err2;
        }
@@ -403,6 +435,7 @@ struct upkg_file *upkg_export_open(struct upkg *pkg, unsigned long idx)
                .pkg  = pkg,
                .base = pkg->priv->exports[idx].offset,
                .len  = pkg->priv->exports[idx].size,
+               .name = pkg->priv->exports[idx].name,
        };
 
        return f;
@@ -415,6 +448,37 @@ void upkg_export_close(struct upkg_file *f)
        free(f);
 }
 
+long upkg_export_tell(struct upkg_file *f)
+{
+       return f->offset;
+}
+
+int upkg_export_seek(struct upkg_file *f, long offset, int whence)
+{
+       int rc = EOF;
+
+       switch (whence) {
+       case SEEK_CUR:
+               offset = f->offset + offset;
+       case SEEK_SET:
+               if (offset < 0 || offset > f->len)
+                       return EOF;
+               rc = fseek(f->pkg->priv->f, f->base + offset, SEEK_SET);
+               break;
+       case SEEK_END:
+               offset = -offset;
+               if (offset < 0 || offset > f->len)
+                       return EOF;
+               offset = f->len - offset;
+               rc = fseek(f->pkg->priv->f, f->base + offset, SEEK_SET);
+               break;
+       }
+
+       if (rc == 0)
+               f->pkg->priv->last_file = f;
+       return rc;
+}
+
 size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n)
 {
        size_t want = MIN(n, f->len - f->offset);