1 files changed, 243 insertions, 0 deletions
diff --git a/lib/sqfs/src/block_processor/frontend.c b/lib/sqfs/src/block_processor/frontend.c
new file mode 100644
index 0000000..e8a4207
--- /dev/null
+++ b/lib/sqfs/src/block_processor/frontend.c
@@ -0,0 +1,243 @@
+/* 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 int get_new_block(sqfs_block_processor_t *proc, sqfs_block_t **out)
+{
+	sqfs_block_t *blk;
+
+	while (proc->backlog >= proc->max_backlog) {
+		int ret = dequeue_block(proc);
+		if (ret != 0)
+			return ret;
+	}
+
+	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)
+			return SQFS_ERROR_ALLOC;
+	}
+
+	memset(blk, 0, sizeof(*blk));
+	*out = blk;
+
+	proc->backlog += 1;
+	return 0;
+}
+
+static int add_sentinel_block(sqfs_block_processor_t *proc)
+{
+	sqfs_block_t *blk;
+	int ret;
+
+	ret = get_new_block(proc, &blk);
+	if (ret != 0)
+		return ret;
+
+	blk->inode = proc->inode;
+	blk->flags = proc->blk_flags | SQFS_BLK_LAST_BLOCK;
+
+	return enqueue_block(proc, blk);
+}
+
+int enqueue_block(sqfs_block_processor_t *proc, sqfs_block_t *blk)
+{
+	int status;
+
+	if ((blk->flags & SQFS_BLK_FRAGMENT_BLOCK) &&
+	    proc->file != NULL && proc->uncmp != NULL) {
+		sqfs_block_t *copy = alloc_flex(sizeof(*copy), 1, blk->size);
+
+		if (copy == NULL)
+			return SQFS_ERROR_ALLOC;
+
+		copy->size = blk->size;
+		copy->index = blk->index;
+		memcpy(copy->data, blk->data, blk->size);
+
+		copy->next = proc->fblk_in_flight;
+		proc->fblk_in_flight = copy;
+	}
+
+	if (proc->pool->submit(proc->pool, blk) != 0) {
+		status = proc->pool->get_status(proc->pool);
+
+		if (status == 0)
+			status = SQFS_ERROR_ALLOC;
+
+		blk->next = proc->free_list;
+		proc->free_list = blk;
+		return status;
+	}
+
+	return 0;
+}
+
+int sqfs_block_processor_begin_file(sqfs_block_processor_t *proc,
+				    sqfs_inode_generic_t **inode,
+				    void *user, sqfs_u32 flags)
+{
+	if (proc->begin_called)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (flags & ~SQFS_BLK_USER_SETTABLE_FLAGS)
+		return SQFS_ERROR_UNSUPPORTED;
+
+	if (inode != NULL) {
+		(*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->begin_called = true;
+	proc->inode = inode;
+	proc->blk_flags = flags | SQFS_BLK_FIRST_BLOCK;
+	proc->blk_index = 0;
+	proc->user = user;
+	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;
+
+	if (!proc->begin_called)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (proc->inode != NULL) {
+		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) {
+			err = get_new_block(proc, &new);
+			if (err != 0)
+				return err;
+
+			proc->blk_current = new;
+			proc->blk_current->flags = proc->blk_flags;
+			proc->blk_current->inode = proc->inode;
+			proc->blk_current->user = proc->user;
+			proc->blk_current->index = proc->blk_index++;
+			proc->blk_flags &= ~SQFS_BLK_FIRST_BLOCK;
+		}
+
+		diff = proc->max_block_size - proc->blk_current->size;
+
+		if (diff == 0) {
+			err = enqueue_block(proc, proc->blk_current);
+			proc->blk_current = NULL;
+
+			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->size == proc->max_block_size) {
+		err = enqueue_block(proc, proc->blk_current);
+		proc->blk_current = NULL;
+
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int sqfs_block_processor_end_file(sqfs_block_processor_t *proc)
+{
+	int err;
+
+	if (!proc->begin_called)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (proc->blk_current == NULL) {
+		if (!(proc->blk_flags & SQFS_BLK_FIRST_BLOCK)) {
+			err = add_sentinel_block(proc);
+			if (err)
+				return err;
+		}
+	} else {
+		if (proc->blk_flags & SQFS_BLK_DONT_FRAGMENT) {
+			proc->blk_current->flags |= SQFS_BLK_LAST_BLOCK;
+		} else {
+			if (!(proc->blk_current->flags &
+			      SQFS_BLK_FIRST_BLOCK)) {
+				err = add_sentinel_block(proc);
+				if (err)
+					return err;
+			}
+
+			proc->blk_current->flags |= SQFS_BLK_IS_FRAGMENT;
+		}
+
+		err = enqueue_block(proc, proc->blk_current);
+		proc->blk_current = NULL;
+
+		if (err)
+			return err;
+	}
+
+	proc->begin_called = false;
+	proc->inode = NULL;
+	proc->user = NULL;
+	proc->blk_flags = 0;
+	return 0;
+}
+
+int sqfs_block_processor_submit_block(sqfs_block_processor_t *proc, void *user,
+				      sqfs_u32 flags, const void *data,
+				      size_t size)
+{
+	sqfs_block_t *blk;
+	int ret;
+
+	if (proc->begin_called)
+		return SQFS_ERROR_SEQUENCE;
+
+	if (size > proc->max_block_size)
+		return SQFS_ERROR_OVERFLOW;
+
+	if (flags & ~SQFS_BLK_FLAGS_ALL)
+		return SQFS_ERROR_UNSUPPORTED;
+
+	ret = get_new_block(proc, &blk);
+	if (ret != 0)
+		return ret;
+
+	blk->flags = flags | BLK_FLAG_MANUAL_SUBMISSION;
+	blk->user = user;
+	blk->size = size;
+	memcpy(blk->data, data, size);
+
+	return enqueue_block(proc, blk);
+}