From 836a34596e3a288c495f1d85f6994f003f4ba2a2 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 30 Apr 2023 02:41:30 -0400
Subject: gzip: Get write buffer after init

---
(limited to 'src')

diff --git a/src/gzip.c b/src/gzip.c
index 2717f54..9e8edfa 100644
--- a/src/gzip.c
+++ b/src/gzip.c
@@ -41,7 +41,7 @@ struct opkg_opk_gzip {
 };
 
 static struct opkg_opk_gzip *
-_opkg_opk_gzip_init(enum _opkg_opk_gzip_dir dir, char *buffer, size_t size,
+_opkg_opk_gzip_init(enum _opkg_opk_gzip_dir dir,
 		opkg_opk_gzip_read_func *read_func,
 		opkg_opk_gzip_write_func *write_func, void *user_data)
 {
@@ -53,12 +53,10 @@ _opkg_opk_gzip_init(enum _opkg_opk_gzip_dir dir, char *buffer, size_t size,
 		return NULL;
 	}
 
-	gzip->dir         = dir;
-	gzip->buffer      = buffer;
-	gzip->buffer_size = size;
-	gzip->read_func   = read_func;
-	gzip->write_func  = write_func;
-	gzip->user_data   = user_data;
+	gzip->dir        = dir;
+	gzip->read_func  = read_func;
+	gzip->write_func = write_func;
+	gzip->user_data  = user_data;
 
 	gzip->stream.zalloc   = Z_NULL;
 	gzip->stream.zfree    = Z_NULL;
@@ -73,8 +71,8 @@ _opkg_opk_gzip_init(enum _opkg_opk_gzip_dir dir, char *buffer, size_t size,
 			return NULL;
 		}
 	} else {
-		gzip->stream.next_out  = buffer;
-		gzip->stream.avail_out = size;
+		gzip->stream.next_out  = Z_NULL;
+		gzip->stream.avail_out = 0;
 		if (deflateInit2(&gzip->stream, 9, Z_DEFLATED,
 					OPKG_OPK_GZIP_WINDOW_BITS_, 9,
 					Z_DEFAULT_STRATEGY) != Z_OK) {
@@ -101,19 +99,27 @@ _opkg_opk_gzip_init(enum _opkg_opk_gzip_dir dir, char *buffer, size_t size,
 struct opkg_opk_gzip *
 opkg_opk_gzip_init_read(opkg_opk_gzip_read_func *read, void *user_data)
 {
-	return _opkg_opk_gzip_init(_OPKG_OPK_GZIP_DIR_READ, NULL, 0,
+	return _opkg_opk_gzip_init(_OPKG_OPK_GZIP_DIR_READ,
 			read, NULL, user_data);
 }
 
 struct opkg_opk_gzip *
-opkg_opk_gzip_init_write(char *buffer, size_t size,
-		opkg_opk_gzip_write_func *write, void *user_data)
+opkg_opk_gzip_init_write(opkg_opk_gzip_write_func *write, void *user_data)
 {
-	return _opkg_opk_gzip_init(_OPKG_OPK_GZIP_DIR_WRITE, buffer, size,
+	return _opkg_opk_gzip_init(_OPKG_OPK_GZIP_DIR_WRITE,
 			NULL, write, user_data);
 }
 
 int
+opkg_opk_gzip_set_write_buffer(struct opkg_opk_gzip *gzip, char *buffer,
+		size_t size)
+{
+	gzip->buffer      = buffer;
+	gzip->buffer_size = size;
+	return OPKG_OPK_OK;
+}
+
+int
 opkg_opk_gzip_read(struct opkg_opk_gzip *gzip, void *record)
 {
 	int end;
diff --git a/src/gzip.h b/src/gzip.h
index 1fd5d5e..437b855 100644
--- a/src/gzip.h
+++ b/src/gzip.h
@@ -45,8 +45,11 @@ struct opkg_opk_gzip *
 opkg_opk_gzip_init_read(opkg_opk_gzip_read_func *read, void *user_data);
 
 struct opkg_opk_gzip *
-opkg_opk_gzip_init_write(char *buffer, size_t size,
-		opkg_opk_gzip_write_func *write, void *user_data);
+opkg_opk_gzip_init_write(opkg_opk_gzip_write_func *write, void *user_data);
+
+int
+opkg_opk_gzip_set_write_buffer(struct opkg_opk_gzip *gzip, char *buffer,
+		size_t size);
 
 /*
  * Reads and decompresses data to output the next record (512 octets).
--
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