/**
 * \file
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 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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 *
 * \author Francesco Sacchi <batt@develer.com>
 *
 * \brief KBlock interface over libc files.
 *
 * notest: avr
 * notest: arm
 */


#include "kblock_posix.h"
#include <string.h>
#include <stdio.h>


static int kblockposix_load(KBlock *b, block_idx_t index)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	fseek(f->fp, index * b->blk_size, SEEK_SET);
	return (fread(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
}

static int kblockposix_store(struct KBlock *b, block_idx_t index)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	fseek(f->fp, index * b->blk_size, SEEK_SET);
	return (fwrite(f->b.priv.buf, 1, b->blk_size, f->fp) == b->blk_size) ? 0 : EOF;
}

static size_t kblockposix_readBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	memcpy(buf, (uint8_t *)f->b.priv.buf + offset, size);
	return size;
}

static size_t kblockposix_readDirect(struct KBlock *b, block_idx_t index, void *buf, size_t offset, size_t size)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
	return fread(buf, 1, size, f->fp);
}

static size_t kblockposix_writeBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	memcpy((uint8_t *)f->b.priv.buf + offset, buf, size);
	return size;
}

static size_t kblockposix_writeDirect(struct KBlock *b, block_idx_t index, const void *buf, size_t offset, size_t size)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	ASSERT(buf);
	ASSERT(index < b->blk_cnt);
	fseek(f->fp, index * b->blk_size + offset, SEEK_SET);
	return fwrite(buf, 1, size, f->fp);
}

static int kblockposix_error(struct KBlock *b)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	return ferror(f->fp);
}


static void kblockposix_claererr(struct KBlock *b)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);
	clearerr(f->fp);
}


static int kblockposix_close(struct KBlock *b)
{
	KBlockPosix *f = KBLOCKPOSIX_CAST(b);

	return fflush(f->fp) | fclose(f->fp);
}


static const KBlockVTable kblockposix_hwbuffered_vt =
{
	.readDirect = kblockposix_readDirect,

	.readBuf = kblockposix_readBuf,
	.writeBuf = kblockposix_writeBuf,
	.load = kblockposix_load,
	.store = kblockposix_store,

	.error = kblockposix_error,
	.clearerr = kblockposix_claererr,
	.close = kblockposix_close,
};

static const KBlockVTable kblockposix_swbuffered_vt =
{
	.readDirect = kblockposix_readDirect,
	.writeDirect =kblockposix_writeDirect,

	.readBuf = kblock_swReadBuf,
	.writeBuf = kblock_swWriteBuf,
	.load = kblock_swLoad,
	.store = kblock_swStore,

	.error = kblockposix_error,
	.clearerr = kblockposix_claererr,
	.close = kblockposix_close,
};

static const KBlockVTable kblockposix_unbuffered_vt =
{
	.readDirect = kblockposix_readDirect,
	.writeDirect =kblockposix_writeDirect,

	.error = kblockposix_error,
	.clearerr = kblockposix_claererr,
	.close = kblockposix_close,
};



void kblockposix_init(KBlockPosix *f, FILE *fp, bool hwbuf, void *buf, size_t block_size, block_idx_t block_count)
{
	ASSERT(f);
	ASSERT(fp);
	ASSERT(block_size);

	memset(f, 0, sizeof(*f));

	DB(f->b.priv.type = KBT_KBLOCKPOSIX);

	f->fp = fp;
	f->b.blk_size = block_size;
	f->b.blk_cnt = block_count;

	f->b.priv.flags |= KB_PARTIAL_WRITE;
	if (buf)
	{
		f->b.priv.flags |= KB_BUFFERED;
		f->b.priv.buf = buf;
		if (hwbuf)
			f->b.priv.vt = &kblockposix_hwbuffered_vt;
		else
			f->b.priv.vt = &kblockposix_swbuffered_vt;
		kblockposix_load(&f->b, 0);
		f->b.priv.curr_blk = 0;
	}
	else
		f->b.priv.vt = &kblockposix_unbuffered_vt;
}