From 1e0e318b510dcd886b303f23f12652b60f1eb5b9 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 02 May 2023 20:06:51 -0400
Subject: gzip: Fix flushing

deflate() apparently must be called with avail_in=0 and Z_FINISH after
processing all input, not with Z_FINISH on the last non-empty input
buffer.
---
diff --git a/src/gzip.c b/src/gzip.c
index 736cbd7..1263ffc 100644
--- a/src/gzip.c
+++ b/src/gzip.c
@@ -174,8 +174,8 @@ opkg_opk_gzip_read(struct opkg_opk_gzip *gzip, void *record)
 	}
 }
 
-int
-opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size,
+static int
+_opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size,
 		int last)
 {
 	/* Sanity check */
@@ -223,6 +223,16 @@ opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size,
 }
 
 int
+opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size)
+{
+	if (_opkg_opk_gzip_write(gzip, record, size, 0) == OPKG_OPK_OK) {
+		return OPKG_OPK_OK;
+	} else {
+		return OPKG_OPK_ERROR;
+	}
+}
+
+int
 opkg_opk_gzip_free(struct opkg_opk_gzip *gzip)
 {
 	int ret;
@@ -233,6 +243,9 @@ opkg_opk_gzip_free(struct opkg_opk_gzip *gzip)
 			ret = OPKG_OPK_ERROR;
 		}
 	} else {
+		if (_opkg_opk_gzip_write(gzip, NULL, 0, 1) != OPKG_OPK_END) {
+			ret = OPKG_OPK_ERROR;
+		}
 		if (deflateEnd(&gzip->stream) != Z_OK) {
 			ret = OPKG_OPK_ERROR;
 		}
diff --git a/src/gzip.h b/src/gzip.h
index 437b855..ecf659a 100644
--- a/src/gzip.h
+++ b/src/gzip.h
@@ -66,8 +66,7 @@ int
 opkg_opk_gzip_read(struct opkg_opk_gzip *gzip, void *record);
 
 int
-opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size,
-		int last);
+opkg_opk_gzip_write(struct opkg_opk_gzip *gzip, void *record, size_t size);
 
 /*
  * Frees a decompression structure.
diff --git a/src/ustar.c b/src/ustar.c
index 88ae7b6..13e7621 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -334,7 +334,7 @@ opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 	sprintf(ustar->header.chksum, "%o", chksum);
 
 	if (opkg_opk_gzip_write(ustar->gzip, &ustar->header,
-				OPKG_OPK_USTAR_RECORD_SIZE, 0) != OPKG_OPK_OK) {
+				OPKG_OPK_USTAR_RECORD_SIZE) != OPKG_OPK_OK) {
 		return OPKG_OPK_ERROR;
 	}
 
@@ -365,7 +365,7 @@ opkg_opk_ustar_write_data(struct opkg_opk_ustar *ustar, size_t size)
 
 	/* Write to gzip stream. */
 	if (opkg_opk_gzip_write(ustar->gzip, ustar->record,
-				OPKG_OPK_USTAR_RECORD_SIZE, 0) != OPKG_OPK_OK) {
+				OPKG_OPK_USTAR_RECORD_SIZE) != OPKG_OPK_OK) {
 		return OPKG_OPK_ERROR;
 	}
 
@@ -378,9 +378,9 @@ opkg_opk_ustar_write_trailer(struct opkg_opk_ustar *ustar)
 {
 	memset(ustar->record, 0, OPKG_OPK_USTAR_RECORD_SIZE);
 	if (opkg_opk_gzip_write(ustar->gzip, ustar->record,
-				OPKG_OPK_USTAR_RECORD_SIZE, 0) != OPKG_OPK_OK ||
+				OPKG_OPK_USTAR_RECORD_SIZE) != OPKG_OPK_OK ||
 			opkg_opk_gzip_write(ustar->gzip, ustar->record,
-				OPKG_OPK_USTAR_RECORD_SIZE, 1) != OPKG_OPK_END)
+				OPKG_OPK_USTAR_RECORD_SIZE) != OPKG_OPK_OK)
 	{
 		return OPKG_OPK_ERROR;
 	}
--
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