Begin zyb/extract

include/zyb/extract.h

@@ -0,0 +1,28 @@
+#ifndef ZYB_EXTRACT_H
+#define ZYB_EXTRACT_H
+
+// libc
+#include <stdio.h>
+
+// libzyb
+#include <zyb/header.h>
+
+// Extract leader from an open zyb
+int zyb_extract_leader(FILE *fptr, struct lead *leader);
+
+// Extract (next) dependency from an open zyb
+int zyb_extract_dependency(FILE *fptr, struct dependency *dep);
+
+// Extract full header from an open zyb
+int zyb_extract_header(FILE *fptr, struct zyb_header *header);
+
+// Extract (next) file from an open zyb
+int zyb_extract_file(FILE *fptr, char *dir);
+
+// Extract full zyb archive
+int zyb_extract_FILE(FILE *fptr, char *dir);
+
+// Extract full zyb archive at `file`
+int zyb_extract(char *file, char *dir);
+
+#endif

include/zyb/header.h

@@ -0,0 +1,58 @@
+#ifndef ZYB_HEADERS_H
+#define ZYB_HEADERS_H
+
+// libc
+#include <sys/types.h>
+
+#define ZYB_MAGIC "ZYB\0"
+#define ZYB_DEP_MAGIC "DEP\0"
+#define ZYB_FILE_MAGIC "ZIP\0"
+#define ZYB_FORMAT_VER 1
+#define ZYB_NAME_LENGTH 100
+
+/*
+ * This struct is the very first thing in any .zyb file.
+ * It contains package metadata, such as the name and dependencies.
+ */
+struct __attribute__((__packed__, aligned(2))) zyb_header {
+	/*
+	 * This struct is the first part of the header,
+	 * containing critical information about the package.
+	 */
+	struct __attribute__((__packed__, aligned(2))) lead {
+		char magic[4];				// Magic (ZYB_MAGIC)
+		unsigned short version;			// Format version (ZYB_FORMAT_VER)
+		char arch[6];				// Magic identifying arch
+		char os[6];				// Magic identifying os
+		char name[ZYB_NAME_LENGTH];		// Name of the package
+		unsigned short major, minor, patch;	// SemVer
+		unsigned short dependencies;		// Number of dependencies
+		unsigned char reserved[2];		// Padding
+	} leader;
+	/*
+	 * This struct contains information about each dependency.
+	 * The number of these struct should EXACTLY be lead.dependencies.
+	 */
+	struct __attribute__((__packed__, aligned(2))) dependency {
+		char magic[4];				// Magic (ZYB_DEP_MAGIC)
+		char name[ZYB_NAME_LENGTH];		// Name of the dependency
+		unsigned short major, minor, patch;	// Minimum SemVer
+		unsigned char reserved[2];		// Padding
+	} dependencies[0];
+};
+
+/*
+ * This struct appends every single file in the .zyb.
+ * It contains metadata for the individual files in the package.
+ * WARNING: CHECKSUM IS FOR THE UNZIPPED FILE.
+ */
+struct __attribute__((__packed__, aligned(2))) zyb_file_header {
+	char magic[4];					// Magic (ZYB_FILE_MAGIC)
+	char *path;					// Destination path of the file
+	mode_t permissions;				// UNIX permission attributes (32 bits)
+	off_t length;					// File length (64 bits)
+	unsigned char checksum[32];			// Checksum of the unzipped file
+	unsigned char reserved[2];			// Padding
+};
+
+#endif