1 files changed, 164 insertions, 0 deletions
diff --git a/lib/sqfs/block_processor/frontend.c b/lib/sqfs/block_processor/frontend.c
new file mode 100644
index 0000000..cfa6581
--- /dev/null
+++ b/lib/sqfs/block_processor/frontend.c
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * frontend.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+static sqfs_block_t *get_new_block(sqfs_block_processor_t *proc)
+{
+	sqfs_block_t *blk;
+
+	if (proc->free_list != NULL) {
+		blk = proc->free_list;
+		proc->free_list = blk->next;
+	} else {
+		blk = malloc(sizeof(*blk) + proc->max_block_size);
+	}
+
+	if (blk != NULL)
+		memset(blk, 0, sizeof(*blk));
+
+	return blk;
+}
+
+static int add_sentinel_block(sqfs_block_processor_t *proc)
+{
+	sqfs_block_t *blk = get_new_block(proc);
+
+	if (blk == NULL)
+		return SQFS_ERROR_ALLOC;
+
+	blk->inode = proc->inode;
+	blk->flags = proc->blk_flags | SQFS_BLK_LAST_BLOCK;
+
+	return append_to_work_queue(proc, blk);
+}
+
+static int flush_block(sqfs_block_processor_t *proc)
+{
+	sqfs_block_t *block = proc->blk_current;
+
+	proc->blk_current = NULL;
+
+	if (block->size < proc->max_block_size &&
+	    !(block->flags & SQFS_BLK_DONT_FRAGMENT)) {
+		block->flags |= SQFS_BLK_IS_FRAGMENT;
+	} else {
+		proc->blk_flags &= ~SQFS_BLK_FIRST_BLOCK;
+	}
+
+	block->index = proc->blk_index++;
+	return append_to_work_queue(proc, block);
+}
+
+int sqfs_block_processor_begin_file(sqfs_block_processor_t *proc,
+				    sqfs_inode_generic_t **inode, sqfs_u32 flags)
+{
+	if (proc->inode != NULL)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (flags & ~SQFS_BLK_USER_SETTABLE_FLAGS)
+		return SQFS_ERROR_UNSUPPORTED;
+
+	(*inode) = calloc(1, sizeof(sqfs_inode_generic_t));
+	if ((*inode) == NULL)
+		return SQFS_ERROR_ALLOC;
+
+	(*inode)->base.type = SQFS_INODE_FILE;
+	sqfs_inode_set_frag_location(*inode, 0xFFFFFFFF, 0xFFFFFFFF);
+
+	proc->inode = inode;
+	proc->blk_flags = flags | SQFS_BLK_FIRST_BLOCK;
+	proc->blk_index = 0;
+	return 0;
+}
+
+int sqfs_block_processor_append(sqfs_block_processor_t *proc, const void *data,
+				size_t size)
+{
+	sqfs_block_t *new;
+	sqfs_u64 filesize;
+	size_t diff;
+	int err;
+
+	sqfs_inode_get_file_size(*(proc->inode), &filesize);
+	sqfs_inode_set_file_size(*(proc->inode), filesize + size);
+
+	while (size > 0) {
+		if (proc->blk_current == NULL) {
+			new = get_new_block(proc);
+			if (new == NULL)
+				return SQFS_ERROR_ALLOC;
+
+			proc->blk_current = new;
+			proc->blk_current->flags = proc->blk_flags;
+			proc->blk_current->inode = proc->inode;
+		}
+
+		diff = proc->max_block_size - proc->blk_current->size;
+
+		if (diff == 0) {
+			err = flush_block(proc);
+			if (err)
+				return err;
+			continue;
+		}
+
+		if (diff > size)
+			diff = size;
+
+		memcpy(proc->blk_current->data + proc->blk_current->size,
+		       data, diff);
+
+		size -= diff;
+		proc->blk_current->size += diff;
+		data = (const char *)data + diff;
+
+		proc->stats.input_bytes_read += diff;
+	}
+
+	if (proc->blk_current != NULL &&
+	    proc->blk_current->size == proc->max_block_size) {
+		return flush_block(proc);
+	}
+
+	return 0;
+}
+
+int sqfs_block_processor_end_file(sqfs_block_processor_t *proc)
+{
+	int err;
+
+	if (proc->inode == NULL)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (!(proc->blk_flags & SQFS_BLK_FIRST_BLOCK)) {
+		if (proc->blk_current != NULL &&
+		    (proc->blk_flags & SQFS_BLK_DONT_FRAGMENT)) {
+			proc->blk_current->flags |= SQFS_BLK_LAST_BLOCK;
+		} else {
+			err = add_sentinel_block(proc);
+			if (err)
+				return err;
+		}
+	}
+
+	if (proc->blk_current != NULL) {
+		err = flush_block(proc);
+		if (err)
+			return err;
+	}
+
+	proc->inode = NULL;
+	proc->blk_flags = 0;
+	return 0;
+}
+
+const sqfs_block_processor_stats_t
+*sqfs_block_processor_get_stats(const sqfs_block_processor_t *proc)
+{
+	return &proc->stats;
+}