X-Git-Url: https://git.draconx.ca/gitweb/upkg.git/blobdiff_plain/82c24245034226967611c9d2c4f6f04b4f9db6cc..b46bbe4f64a68fdec38675690f9576c2cbdf4cd3:/src/libupkg.c

diff --git a/src/libupkg.c b/src/libupkg.c
index 8072516..d5203b4 100644
--- a/src/libupkg.c
+++ b/src/libupkg.c
@@ -156,7 +156,7 @@ static int pkg_init_names(struct upkg *pkg)
 {
 	size_t rc, len, nbuf = 0;
 	unsigned long index = 0;
-	char buf[512];
+	unsigned char buf[512];
 
 	if (fseek(pkg->priv->f, pkg->priv->name_offset, SEEK_SET) != 0)
 		return -1;
@@ -191,7 +191,7 @@ static int pkg_init_names(struct upkg *pkg)
 			memmove(buf, buf+len+1, nbuf);
 			index++;
 		} else {
-			char *c = memchr(buf, 0, nbuf);
+			unsigned char *c = memchr(buf, 0, nbuf);
 			if (!c || nbuf <= c - buf + 5)
 				goto err;
 			len = c - buf + 1;
@@ -220,7 +220,7 @@ static int pkg_init_exports(struct upkg *pkg)
 {
 	size_t rc, len, nbuf = 0;
 	unsigned long index = 0;
-	char buf[512];
+	unsigned char buf[512];
 
 	if (fseek(pkg->priv->f, pkg->priv->export_offset, SEEK_SET) != 0)
 		return -1;
@@ -263,13 +263,15 @@ static int pkg_init_exports(struct upkg *pkg)
 		export->flags = unpack_32_le(buf+len);
 		len += 4;
 
-		rc = upkg_decode_index(&export->size, buf+len, nbuf-len);
-		if (rc == 0) goto err;
+		rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
+		if (rc == 0 || tmp < 0) goto err;
+		export->size = tmp;
 		len += rc;
 
 		if (export->size) {
-			rc = upkg_decode_index(&export->offset, buf+len, nbuf-len);
-			if (rc == 0) goto err;
+			rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
+			if (rc == 0 || tmp < 0) goto err;
+			export->offset = tmp;
 			len += rc;
 		}
 
@@ -288,7 +290,7 @@ static int pkg_init_imports(struct upkg *pkg)
 {
 	size_t rc, len, nbuf = 0;
 	unsigned long index = 0;
-	char buf[512];
+	unsigned char buf[512];
 
 	if (fseek(pkg->priv->f, pkg->priv->import_offset, SEEK_SET) != 0)
 		return -1;
@@ -420,6 +422,105 @@ const char *upkg_get_name(struct upkg *pkg, unsigned long idx)
 	return pkg->priv->names[idx].name;
 }
 
+long upkg_export_find(struct upkg *pkg, const char *name)
+{
+	/* This is wrong.
+	 * Export names are not necessarily unique within a package. */
+	for (unsigned i = 0; i < pkg->export_count; i++) {
+		struct upkg_export *export = &pkg->priv->exports[i];
+		if (strcmp(export->name, name) == 0) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+const char *upkg_export_name(struct upkg *pkg, unsigned long idx)
+{
+	if (idx < pkg->export_count)
+		return pkg->priv->exports[idx].name;
+	return NULL;
+}
+
+const char *upkg_export_class(struct upkg *pkg, unsigned long idx,
+                              const char **package, const char **group)
+{
+	struct upkg_export *export;
+	struct upkg_import *iclass, *ipackage;
+	unsigned long pkg_idx;
+
+	if (idx >= pkg->export_count)
+		return NULL;
+	
+	export = &pkg->priv->exports[idx];
+
+	/* ASSUMPTION: class references are always imports */
+	if (export->class > 0) {
+		fprintf(stderr, "Assumption Violated: class not import\n");
+		return NULL;
+	}
+
+	/* ASSUMPTION: group references are always exports */
+	if (export->package < 0) {
+		fprintf(stderr, "Assumption Violated: group not export\n");
+		return NULL;
+	}
+
+	/* Get the group name. */
+	if (export->package > 0) {
+		pkg_idx = export->package - 1;
+
+		if (pkg_idx >= pkg->export_count) {
+			return NULL;
+		}
+
+		/* Lots more to handle.  Function arguments are stupid. */
+
+		if (group) *group = pkg->priv->exports[pkg_idx].name;
+	} else {
+		if (group) *group = NULL;
+	}
+
+	/* Get the class. */
+	if (export->class == 0) {
+		if (package) *package = "Core";
+		return "Class";
+	}
+
+	pkg_idx = -(export->class + 1);
+	if (pkg_idx >= pkg->import_count)
+		return NULL;
+	iclass = &pkg->priv->imports[pkg_idx];
+
+	/* ASSUMPTION: Class references are always Core.Class */
+	if (strcmp(iclass->class_name, "Class") || strcmp(iclass->class_package, "Core")) {
+		fprintf(stderr, "Assumption Violated: class not Core.Class\n");
+		return NULL;
+	}
+
+	/* ASSUMPTION: Package references are always imports */
+	if (iclass->package >= 0) {
+		fprintf(stderr, "Assumption Violated: package not import\n");
+		return NULL;
+	}
+
+	/* Get the package. */
+	pkg_idx = -(iclass->package + 1);
+	if (pkg_idx >= pkg->import_count)
+		return NULL;
+	ipackage = &pkg->priv->imports[pkg_idx];
+
+	/* ASSUMPTION: Package references are always Core.Package */
+	if (strcmp(ipackage->class_name, "Package") || strcmp(ipackage->class_package, "Core")) {
+		fprintf(stderr, "Assumption Violated: package not Core.Package\n");
+		return NULL;
+	}
+
+	if (package) *package = ipackage->object_name;
+	return iclass->object_name;
+}
+
 struct upkg_file *upkg_export_open(struct upkg *pkg, unsigned long idx)
 {
 	struct upkg_file *f;
@@ -476,6 +577,7 @@ int upkg_export_seek(struct upkg_file *f, long offset, int whence)
 
 	if (rc == 0) {
 		f->pkg->priv->last_file = f;
+		f->offset = offset;
 		f->eof = 0;
 	} else if (f->pkg->priv->last_file == f) {
 		f->pkg->priv->last_file = NULL;
@@ -501,7 +603,7 @@ size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n)
 	rc = fread(buf, 1, want, f->pkg->priv->f);
 	f->offset += rc;
 
-	if (want < n || rc < want && feof(f->pkg->priv->f))
+	if (want < n || (rc < want && feof(f->pkg->priv->f)))
 		f->eof = 1;
 	return rc;
 }