X-Git-Url: https://git.draconx.ca/gitweb/upkg.git/blobdiff_plain/959d4dd5bc102359f414a7feb718d56bf1b012e6..d2ff3349e261109e18d20cff1a236d3ac573ad58:/src/libupkg.c

diff --git a/src/libupkg.c b/src/libupkg.c
index 850c0c7..40b3913 100644
--- a/src/libupkg.c
+++ b/src/libupkg.c
@@ -2,9 +2,9 @@
  *  upkg: tool for manipulating Unreal Tournament packages.
  *  Copyright (C) 2009 Nick Bowler
  *
- *  This program is free software; you can redistribute it and/or modify
+ *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
+ *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
@@ -13,8 +13,7 @@
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <stdio.h>
@@ -45,7 +44,11 @@ struct upkg_import {
 };
 
 struct upkg_private {
-	FILE *f;
+	const struct upkg_file_ops *fops;
+	int (*dtor)(void *handle);
+	void *f;
+
+	struct upkg_file *last_file;
 
 	struct upkg_name   *names;
 	struct upkg_export *exports;
@@ -55,12 +58,45 @@ struct upkg_private {
 	unsigned char guid[16];
 };
 
+/* Default I/O operations for ordinary files. */
+static size_t file_read(void *buf, size_t size, void *handle)
+{
+	return fread(buf, 1, size, (FILE *)handle);
+}
+
+static int file_seek(void *handle, long offset, int whence)
+{
+	return fseek((FILE *)handle, offset, whence);
+}
+
+static long file_tell(void *handle)
+{
+	return ftell((FILE *)handle);
+}
+
+static int file_eof(void *handle)
+{
+	return feof((FILE *)handle);
+}
+
+static int file_close(void *handle)
+{
+	return fclose((FILE *)handle);
+}
+
+const struct upkg_file_ops upkg_default_fops = {
+	.read = file_read,
+	.seek = file_seek,
+	.tell = file_tell,
+	.eof  = file_eof,
+};
+
 /*
  * Decode the compact index format from the upkg.  This format is fucked.
  * 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;
 
@@ -93,40 +129,74 @@ static size_t decode_index(long *val, unsigned char *bytes, size_t n)
 
 static struct upkg *init_upkg(unsigned char hdr[static UPKG_HDR_SIZE])
 {
-	struct upkg *pkg;
+	struct {
+		struct upkg pkg;
+		struct upkg_private priv;
+	} *alloc;
 
-	pkg = malloc(sizeof *pkg);
-	if (!pkg) {
+	alloc = malloc(sizeof *alloc);
+	if (!alloc) {
 		return NULL;
 	}
 
-	pkg->priv = malloc(sizeof *pkg->priv);
-	if (!pkg->priv) {
-		free(pkg);
-		return NULL;
-	}
+	alloc->pkg = (struct upkg) {
+		.version      = unpack_16_le(hdr+4),
+		.license      = unpack_16_le(hdr+6),
+		.flags        = unpack_32_le(hdr+8),
+		.name_count   = unpack_32_le(hdr+12),
+		.export_count = unpack_32_le(hdr+20),
+		.import_count = unpack_32_le(hdr+28),
+		.priv         = &alloc->priv,
+	};
+
+	alloc->priv = (struct upkg_private) {
+		.name_offset   = unpack_32_le(hdr+16),
+		.export_offset = unpack_32_le(hdr+24),
+		.import_offset = unpack_32_le(hdr+32),
+	};
+
+	return &alloc->pkg;
+}
 
-	pkg->version      = unpack_16_le(hdr+4);
-	pkg->license      = unpack_16_le(hdr+6);
-	pkg->flags        = unpack_32_le(hdr+8);
-	pkg->name_count   = unpack_32_le(hdr+12);
-	pkg->export_count = unpack_32_le(hdr+20);
-	pkg->import_count = unpack_32_le(hdr+28);
+static int pkg_init_guid(struct upkg *pkg)
+{
+	const struct upkg_file_ops *fops = pkg->priv->fops;
+	size_t rc;
 
-	pkg->priv->name_offset   = unpack_32_le(hdr+16);
-	pkg->priv->export_offset = unpack_32_le(hdr+24);
-	pkg->priv->import_offset = unpack_32_le(hdr+32);
+	if (pkg->version < 68) {
+		unsigned long heritage_count, heritage_offset;
+		unsigned char buf[8];
 
-	return pkg;
+		rc = fops->read(buf, 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 (fops->seek(pkg->priv->f, heritage_offset, SEEK_SET) != 0)
+			return -1;
+	}
+
+	rc = fops->read(pkg->guid, 16, pkg->priv->f);
+	if (rc < 16)
+		return -1;
+
+	return 0;
 }
 
 static int pkg_init_names(struct upkg *pkg)
 {
+	const struct upkg_file_ops *fops = pkg->priv->fops;
+	void *f = pkg->priv->f;
+
 	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)
+	if (fops->seek(f, pkg->priv->name_offset, SEEK_SET) != 0)
 		return -1;
 
 	pkg->priv->names = malloc(pkg->name_count * sizeof *pkg->priv->names);
@@ -137,9 +207,9 @@ static int pkg_init_names(struct upkg *pkg)
 		struct upkg_name *name = &pkg->priv->names[index];
 
 		/* Read some data into buffer. */
-		if (!feof(pkg->priv->f)) {
-			rc = fread(buf+nbuf, 1, sizeof buf-nbuf, pkg->priv->f);
-			if (rc == 0)
+		if (!fops->eof(pkg->priv->f)) {
+			rc = fops->read(buf+nbuf, sizeof buf-nbuf, f);
+			if (rc == 0 && nbuf == 0)
 				goto err;
 			nbuf += rc;
 		}
@@ -159,7 +229,7 @@ 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;
@@ -186,11 +256,14 @@ err:
 
 static int pkg_init_exports(struct upkg *pkg)
 {
+	const struct upkg_file_ops *fops = pkg->priv->fops;
+	void *f = pkg->priv->f;
+
 	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)
+	if (fops->seek(f, pkg->priv->export_offset, SEEK_SET) != 0)
 		return -1;
 
 	pkg->priv->exports = malloc(pkg->export_count * sizeof *pkg->priv->exports);
@@ -202,27 +275,27 @@ static int pkg_init_exports(struct upkg *pkg)
 		long tmp;
 
 		/* Read some data into buffer. */
-		if (!feof(pkg->priv->f)) {
-			rc = fread(buf+nbuf, 1, sizeof buf-nbuf, pkg->priv->f);
-			if (rc == 0)
+		if (!fops->eof(pkg->priv->f)) {
+			rc = fops->read(buf+nbuf, sizeof buf-nbuf, f);
+			if (rc == 0 && nbuf == 0)
 				goto err;
 			nbuf += rc;
 		}
 
 		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;
 
 		if (nbuf-len < 4) goto err;
-		export->package = unpack_32_le(buf+len);
+		export->package = unpack_s32_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;
@@ -231,13 +304,15 @@ 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);
-		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 = 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;
 		}
 
@@ -254,11 +329,14 @@ err:
 
 static int pkg_init_imports(struct upkg *pkg)
 {
+	const struct upkg_file_ops *fops = pkg->priv->fops;
+	void *f = pkg->priv->f;
+
 	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)
+	if (fops->seek(f, pkg->priv->import_offset, SEEK_SET) != 0)
 		return -1;
 
 	pkg->priv->imports = malloc(pkg->import_count * sizeof *pkg->priv->imports);
@@ -270,30 +348,30 @@ static int pkg_init_imports(struct upkg *pkg)
 		long tmp;
 
 		/* Read some data into buffer. */
-		if (!feof(pkg->priv->f)) {
-			rc = fread(buf+nbuf, 1, sizeof buf-nbuf, pkg->priv->f);
-			if (rc == 0)
+		if (!fops->eof(pkg->priv->f)) {
+			rc = fops->read(buf+nbuf, sizeof buf-nbuf, f);
+			if (rc == 0 && nbuf == 0)
 				goto err;
 			nbuf += rc;
 		}
 
 		len = 0;
-		rc = decode_index(&tmp, buf+len, nbuf-len);
-		if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
+		rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
+		if (rc == 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);
-		if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
+		rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
+		if (rc == 0 || len >= pkg->name_count) goto err;
 		import->class_name = pkg->priv->names[tmp].name;
 		len += rc;
 
 		if (nbuf-len < 4) goto err;
-		import->package = unpack_32_le(buf+len);
+		import->package = unpack_s32_le(buf+len);
 		len += 4;
 
-		rc = decode_index(&tmp, buf+len, nbuf-len);
-		if (rc == 0 || len < 0 || len >= pkg->name_count) goto err;
+		rc = upkg_decode_index(&tmp, buf+len, nbuf-len);
+		if (rc == 0 || len >= pkg->name_count) goto err;
 		import->object_name = pkg->priv->names[tmp].name;
 		len += rc;
 
@@ -308,72 +386,89 @@ err:
 	return -1;
 }
 
-struct upkg *upkg_fopen(const char *path)
+struct upkg *upkg_open(void *f, const struct upkg_file_ops *fops,
+                       int (*destructor)(void *handle))
 {
 	unsigned char hdr_buf[UPKG_HDR_SIZE];
 	struct upkg *pkg;
-	FILE *f;
 
-	if (!(f = fopen(path, "rb"))) {
+	if (fops->read(hdr_buf, sizeof hdr_buf, f) != sizeof hdr_buf) {
 		return NULL;
 	}
-	if (fread(hdr_buf, sizeof hdr_buf, 1, f) != 1) {
-		goto err1;
-	}
 	if (unpack_32_le(hdr_buf) != UPKG_HDR_MAGIC) {
-		goto err1;
+		return NULL;
 	}
 
 	/* Initialize package structure. */
 	pkg = init_upkg(hdr_buf);
 	if (!pkg) {
+		return NULL;
+	}
+	pkg->priv->fops = fops;
+	pkg->priv->dtor = destructor;
+	pkg->priv->f    = f;
+
+	if (pkg_init_guid(pkg) != 0) {
 		goto err1;
 	}
-	pkg->priv->f = f;
 
 	if (pkg_init_names(pkg) != 0) {
-		goto err2;
+		goto err1;
 	}
 
 	if (pkg_init_exports(pkg) != 0) {
-		goto err3;
+		goto err2;
 	}
 
 	if (pkg_init_imports(pkg) != 0) {
-		goto err4;
+		goto err3;
 	}
 
 	return pkg;
-err4:
-	free(pkg->priv->exports);
 err3:
+	free(pkg->priv->exports);
+err2:
 	for (unsigned i = 0; i < pkg->name_count; i++)
 		free(pkg->priv->names[i].name);
 	free(pkg->priv->names);
-err2:
-	free(pkg->priv);
-	free(pkg);
 err1:
-	fclose(f);
+	free(pkg);
 	return NULL;
 }
 
+struct upkg *upkg_fopen(const char *path)
+{
+	struct upkg *pkg;
+	FILE *f;
+
+	f = fopen(path, "rb");
+	if (!f) {
+		return NULL;
+	}
+
+	pkg = upkg_open(f, &upkg_default_fops, file_close);
+	if (!pkg) {
+		fclose(f);
+	}
+
+	return pkg;
+}
+
 int upkg_close(struct upkg *pkg)
 {
 	int rc = 0;
 
-	if (pkg->priv->f) {
-		rc = fclose(pkg->priv->f);
+	if (pkg->priv->dtor) {
+		rc = pkg->priv->dtor(pkg->priv->f);
+	}
 
-		for (unsigned i = 0; i < pkg->name_count; i++) {
-			free(pkg->priv->names[i].name);
-		}
+	for (unsigned i = 0; i < pkg->name_count; i++) {
+		free(pkg->priv->names[i].name);
 	}
 
 	free(pkg->priv->imports);
 	free(pkg->priv->exports);
 	free(pkg->priv->names);
-	free(pkg->priv);
 	free(pkg);
 
 	return rc;
@@ -385,3 +480,177 @@ const char *upkg_get_name(struct upkg *pkg, unsigned long idx)
 		return 0;
 	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;
+}
+
+unsigned long upkg_export_flags(struct upkg *pkg, unsigned long idx)
+{
+	if (idx < pkg->export_count)
+		return pkg->priv->exports[idx].flags;
+	return 0;
+}
+
+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)
+{
+	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;
+	}
+
+	/* 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;
+
+	if (idx >= pkg->export_count)
+		return NULL;
+
+	f = malloc(sizeof *f);
+	if (f == NULL)
+		return NULL;
+
+	*f = (struct upkg_file) {
+		.pkg  = pkg,
+		.base = pkg->priv->exports[idx].offset,
+		.len  = pkg->priv->exports[idx].size,
+		.name = pkg->priv->exports[idx].name,
+	};
+
+	return f;
+}
+
+void upkg_export_close(struct upkg_file *f)
+{
+	if (f->pkg->priv->last_file == f)
+		f->pkg->priv->last_file = NULL;
+	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)
+{
+	const struct upkg_file_ops *fops = f->pkg->priv->fops;
+	int rc = EOF;
+
+	switch (whence) {
+	case SEEK_CUR:
+		offset = f->offset + offset;
+	case SEEK_SET:
+		if (offset < 0 || offset > f->len)
+			return EOF;
+		rc = fops->seek(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 = fops->seek(f->pkg->priv->f, f->base + offset, SEEK_SET);
+		break;
+	}
+
+	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;
+	}
+
+	return rc;
+}
+
+size_t upkg_export_read(struct upkg_file *f, void *buf, size_t n)
+{
+	const struct upkg_file_ops *fops = f->pkg->priv->fops;
+	size_t want = MIN(n, f->len - f->offset);
+	size_t rc;
+
+	if (want == 0) {
+		return 0;
+	}
+
+	if (f != f->pkg->priv->last_file) {
+		if (fops->seek(f->pkg->priv->f, f->base + f->offset, SEEK_SET))
+			return 0;
+	}
+
+	rc = fops->read(buf, want, f->pkg->priv->f);
+	f->offset += rc;
+
+	if (want < n || (rc < want && fops->eof(f->pkg->priv->f)))
+		f->eof = 1;
+	return rc;
+}