From f9624e400f638e149f67f13b1894ebf7047d6782 Mon Sep 17 00:00:00 2001
From: Enno Boland <g@s01.de>
Date: Sat, 22 Jul 2023 19:28:34 +0200
Subject: [PATCH] extractor: make buffer an object variable

---
 include/sqsh_extract_private.h | 12 +++++++-----
 lib/extract/extract_manager.c  |  5 +++--
 lib/extract/extractor.c        |  9 ++++++---
 3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/sqsh_extract_private.h b/include/sqsh_extract_private.h
index fbc3e3b52..f53334809 100644
--- a/include/sqsh_extract_private.h
+++ b/include/sqsh_extract_private.h
@@ -91,6 +91,7 @@ struct SqshExtractor {
 	/**
 	 * @privatesection
 	 */
+	struct SqshBuffer *buffer;
 	const struct SqshExtractorImpl *impl;
 	size_t block_size;
 };
@@ -101,29 +102,30 @@ struct SqshExtractor {
  * @brief Initializes a extractor context.
  *
  * @param[out] extractor      The context to initialize.
+ * @param[out] buffer         The buffer to store the decompressed data.
  * @param[in]  algorithm_id   The id of the compression algorithm to use.
  * @param[in]  block_size     The block size to use for the extraction.
  *
  * @return 0 on success, a negative value on error.
  */
 SQSH_NO_UNUSED int sqsh__extractor_init(
-		struct SqshExtractor *extractor, int algorithm_id, size_t block_size);
+		struct SqshExtractor *extractor, struct SqshBuffer *buffer,
+		int algorithm_id, size_t block_size);
 
 /**
  * @internal
  * @memberof SqshExtractor
  * @brief Decompresses data to a buffer.
  *
- * @param[in]     extractor     The extractor context to use.
- * @param[out]    buffer          The buffer to store the decompressed data.
+ * @param[in]     extractor       The extractor context to use.
  * @param[in]     compressed      The compressed data to decompress.
  * @param[in]     compressed_size The size of the compressed data.
  *
  * @return 0 on success, a negative value on error.
  */
 SQSH_NO_UNUSED int sqsh__extractor_to_buffer(
-		const struct SqshExtractor *extractor, struct SqshBuffer *buffer,
-		const uint8_t *compressed, const size_t compressed_size);
+		const struct SqshExtractor *extractor, const uint8_t *compressed,
+		const size_t compressed_size);
 
 /**
  * @internal
diff --git a/lib/extract/extract_manager.c b/lib/extract/extract_manager.c
index 9c67c1b20..13c1510c0 100644
--- a/lib/extract/extract_manager.c
+++ b/lib/extract/extract_manager.c
@@ -155,12 +155,13 @@ sqsh__extract_manager_uncompress(
 		}
 		const uint8_t *data = sqsh__map_reader_data(reader);
 
-		rv = sqsh__extractor_init(&extractor, compression_id, block_size);
+		rv = sqsh__extractor_init(
+				&extractor, &buffer, compression_id, block_size);
 		if (rv < 0) {
 			goto out;
 		}
 
-		rv = sqsh__extractor_to_buffer(&extractor, &buffer, data, size);
+		rv = sqsh__extractor_to_buffer(&extractor, data, size);
 		if (rv < 0) {
 			sqsh__buffer_cleanup(&buffer);
 			goto out;
diff --git a/lib/extract/extractor.c b/lib/extract/extractor.c
index ac2bf7b0b..7b69f2dfb 100644
--- a/lib/extract/extractor.c
+++ b/lib/extract/extractor.c
@@ -62,26 +62,29 @@ extractor_by_id(int id) {
 
 int
 sqsh__extractor_init(
-		struct SqshExtractor *extractor, int algorithm_id, size_t block_size) {
+		struct SqshExtractor *extractor, struct SqshBuffer *buffer,
+		int algorithm_id, size_t block_size) {
 	const struct SqshExtractorImpl *impl = extractor_by_id(algorithm_id);
 	if (impl == NULL) {
 		return -SQSH_ERROR_COMPRESSION_UNSUPPORTED;
 	}
 	extractor->impl = impl;
 	extractor->block_size = block_size;
+	extractor->buffer = buffer;
 	return 0;
 }
 
 int
 sqsh__extractor_to_buffer(
-		const struct SqshExtractor *extractor, struct SqshBuffer *buffer,
-		const uint8_t *compressed, const size_t compressed_size) {
+		const struct SqshExtractor *extractor, const uint8_t *compressed,
+		const size_t compressed_size) {
 	int rv = 0;
 	size_t max_size = extractor->block_size;
 	size_t size = 0;
 	uint8_t *decompressed = NULL;
 	const struct SqshExtractorImpl *impl = extractor->impl;
 	sqsh__extractor_context_t extractor_context = {0};
+	struct SqshBuffer *buffer = extractor->buffer;
 
 	rv = sqsh__buffer_add_capacity(buffer, &decompressed, max_size);
 	if (rv < 0) {