From e6c4ea9b8bfc02574fa2c8927d9bfb48df3ee6d4 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Fri, 26 Jul 2019 12:02:34 +0200
Subject: Split data_reader_dump_file into smaller functions

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/sqfs/data_reader.c | 132 +++++++++++++++++++++++++------------------------
 1 file changed, 67 insertions(+), 65 deletions(-)

(limited to 'lib/sqfs/data_reader.c')

diff --git a/lib/sqfs/data_reader.c b/lib/sqfs/data_reader.c
index e03a436..196da32 100644
--- a/lib/sqfs/data_reader.c
+++ b/lib/sqfs/data_reader.c
@@ -61,86 +61,94 @@ void data_reader_destroy(data_reader_t *data)
 	free(data);
 }
 
-int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd,
-			  bool allow_sparse)
+static int dump_blocks(data_reader_t *data, file_info_t *fi, int outfd,
+		       bool allow_sparse, size_t count)
 {
-	size_t i, count, fragsz, unpackedsz;
-	off_t sqfs_location;
+	off_t sqfs_location = fi->startblock;
+	size_t i, unpackedsz;
 	uint64_t filesz = 0;
 	bool compressed;
 	uint32_t bs;
 	ssize_t ret;
 	void *ptr;
 
-	count = fi->size / data->block_size;
-	fragsz = fi->size % data->block_size;
+	for (i = 0; i < count; ++i) {
+		bs = fi->blocksizes[i];
 
-	if (fragsz != 0 && (fi->fragment == 0xFFFFFFFF ||
-			    fi->fragment_offset == 0xFFFFFFFF)) {
-		fragsz = 0;
-		++count;
-	}
+		compressed = (bs & (1 << 24)) == 0;
+		bs &= (1 << 24) - 1;
 
-	if (count > 0) {
-		sqfs_location = fi->startblock;
+		if (bs > data->block_size)
+			goto fail_bs;
 
-		for (i = 0; i < count; ++i) {
-			bs = fi->blocksizes[i];
+		if ((fi->size - filesz) < (uint64_t)data->block_size) {
+			unpackedsz = fi->size - filesz;
+		} else {
+			unpackedsz = data->block_size;
+		}
 
-			compressed = (bs & (1 << 24)) == 0;
-			bs &= (1 << 24) - 1;
+		filesz += unpackedsz;
 
-			if (bs > data->block_size)
-				goto fail_bs;
+		if (bs == 0 && allow_sparse) {
+			if (ftruncate(outfd, filesz))
+				goto fail_sparse;
+			if (lseek(outfd, 0, SEEK_END) == (off_t)-1)
+				goto fail_sparse;
+			continue;
+		}
 
-			if ((fi->size - filesz) < (uint64_t)data->block_size) {
-				unpackedsz = fi->size - filesz;
-			} else {
-				unpackedsz = data->block_size;
+		if (bs == 0) {
+			memset(data->buffer, 0, unpackedsz);
+			compressed = false;
+		} else {
+			if (read_data_at("reading data block", sqfs_location,
+					 data->sqfsfd, data->buffer, bs)) {
+				return -1;
 			}
+			sqfs_location += bs;
+		}
 
-			filesz += unpackedsz;
+		if (compressed) {
+			ret = data->cmp->do_block(data->cmp, data->buffer, bs,
+						  data->scratch,
+						  data->block_size);
+			if (ret <= 0)
+				return -1;
 
-			if (bs == 0 && allow_sparse) {
-				if (ftruncate(outfd, filesz))
-					goto fail_sparse;
-				if (lseek(outfd, 0, SEEK_END) == (off_t)-1)
-					goto fail_sparse;
-				continue;
-			}
+			ptr = data->scratch;
+		} else {
+			ptr = data->buffer;
+		}
 
-			if (bs == 0) {
-				memset(data->buffer, 0, unpackedsz);
-				compressed = false;
-			} else {
-				if (read_data_at("reading data block",
-						 sqfs_location, data->sqfsfd,
-						 data->buffer, bs)) {
-					return -1;
-				}
-				sqfs_location += bs;
-			}
+		if (write_data("writing uncompressed block",
+			       outfd, ptr, unpackedsz)) {
+			return -1;
+		}
+	}
+	return 0;
+fail_sparse:
+	perror("creating sparse output file");
+	return -1;
+fail_bs:
+	fputs("found compressed block larger than block size\n", stderr);
+	return -1;
+}
 
-			if (compressed) {
-				ret = data->cmp->do_block(data->cmp,
-							  data->buffer, bs,
-							  data->scratch,
-							  data->block_size);
-				if (ret <= 0)
-					return -1;
-
-				ptr = data->scratch;
-			} else {
-				ptr = data->buffer;
-			}
+int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd,
+			  bool allow_sparse)
+{
+	size_t fragsz = fi->size % data->block_size;
+	size_t count = fi->size / data->block_size;
 
-			if (write_data("writing uncompressed block",
-					outfd, ptr, unpackedsz)) {
-				return -1;
-			}
-		}
+	if (fragsz != 0 && (fi->fragment == 0xFFFFFFFF ||
+			    fi->fragment_offset == 0xFFFFFFFF)) {
+		fragsz = 0;
+		++count;
 	}
 
+	if (dump_blocks(data, fi, outfd, allow_sparse, count))
+		return -1;
+
 	if (fragsz > 0) {
 		if (data->frag == NULL)
 			goto fail_frag;
@@ -158,12 +166,6 @@ int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd,
 	}
 
 	return 0;
-fail_sparse:
-	perror("creating sparse output file");
-	return -1;
-fail_bs:
-	fputs("found compressed block larger than block size\n", stderr);
-	return -1;
 fail_frag:
 	fputs("file not a multiple of block size but no fragments available\n",
 	      stderr);
-- 
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