Rename bootimgtool to magiskboot

jni/magiskboot/compress.c

@@ -0,0 +1,59 @@
+#include "magiskboot.h"
+
+void gzip(int dec, const char* filename, unsigned char* buf, size_t size) {
+	int ret, flush, have, pos = 0;
+	z_stream strm;
+	unsigned char out[CHUNK];
+
+	int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+
+	if (fd < 0)
+		error(1, "Unable to create %s", filename);
+
+	strm.zalloc = Z_NULL;
+	strm.zfree = Z_NULL;
+	strm.opaque = Z_NULL;
+
+	if (dec) {
+		ret = inflateInit2(&strm, windowBits | ZLIB_GZIP);
+	} else {
+		ret = deflateInit2(&strm, 9, Z_DEFLATED, windowBits | ZLIB_GZIP, memLevel, Z_DEFAULT_STRATEGY);
+	}
+
+	if (ret != Z_OK)
+		error(1, "Unable to init zlib");
+
+	do {
+		strm.next_in = buf + pos;
+		if (pos + CHUNK > size) {
+			strm.avail_in = size - pos;
+			pos = size;
+			flush = Z_FINISH;
+		} else {
+			strm.avail_in = CHUNK;
+			pos += CHUNK;
+			flush = Z_NO_FLUSH;
+		}
+
+		do {
+			strm.avail_out = CHUNK;
+			strm.next_out = out;
+			if (dec) {
+				inflate(&strm, flush);
+			} else {
+				deflate(&strm, flush);
+			}
+			have = CHUNK - strm.avail_out;
+			if (write(fd, out, have) != have)
+				error(1, "Error in writing %s", filename);
+		} while (strm.avail_out == 0);
+
+	} while(pos < size);
+
+	if (dec) {
+		inflateEnd(&strm);
+	} else {
+		deflateEnd(&strm);
+	}
+	close(fd);
+}