// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2016 MediaTek Inc.
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* Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
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* Rick Chang <rick.chang@mediatek.com>
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*/
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#include <linux/kernel.h>
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#include <linux/videodev2.h>
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#include "mtk_jpeg_dec_parse.h"
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#define TEM 0x01
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#define SOF0 0xc0
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#define RST 0xd0
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#define SOI 0xd8
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#define EOI 0xd9
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struct mtk_jpeg_stream {
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u8 *addr;
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u32 size;
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u32 curr;
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};
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static int read_byte(struct mtk_jpeg_stream *stream)
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{
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if (stream->curr >= stream->size)
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return -1;
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return stream->addr[stream->curr++];
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}
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static int read_word_be(struct mtk_jpeg_stream *stream, u32 *word)
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{
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u32 temp;
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int byte;
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byte = read_byte(stream);
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if (byte == -1)
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return -1;
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temp = byte << 8;
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byte = read_byte(stream);
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if (byte == -1)
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return -1;
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*word = (u32)byte | temp;
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return 0;
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}
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static void read_skip(struct mtk_jpeg_stream *stream, long len)
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{
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if (len <= 0)
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return;
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while (len--)
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read_byte(stream);
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}
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static bool mtk_jpeg_do_parse(struct mtk_jpeg_dec_param *param, u8 *src_addr_va,
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u32 src_size)
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{
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bool notfound = true;
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struct mtk_jpeg_stream stream;
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stream.addr = src_addr_va;
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stream.size = src_size;
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stream.curr = 0;
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while (notfound) {
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int i, length, byte;
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u32 word;
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byte = read_byte(&stream);
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if (byte == -1)
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return false;
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if (byte != 0xff)
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continue;
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do
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byte = read_byte(&stream);
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while (byte == 0xff);
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if (byte == -1)
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return false;
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if (byte == 0)
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continue;
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length = 0;
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switch (byte) {
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case SOF0:
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/* length */
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if (read_word_be(&stream, &word))
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break;
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/* precision */
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if (read_byte(&stream) == -1)
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break;
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if (read_word_be(&stream, &word))
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break;
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param->pic_h = word;
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if (read_word_be(&stream, &word))
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break;
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param->pic_w = word;
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param->comp_num = read_byte(&stream);
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if (param->comp_num != 1 && param->comp_num != 3)
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break;
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for (i = 0; i < param->comp_num; i++) {
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param->comp_id[i] = read_byte(&stream);
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if (param->comp_id[i] == -1)
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break;
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/* sampling */
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byte = read_byte(&stream);
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if (byte == -1)
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break;
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param->sampling_w[i] = (byte >> 4) & 0x0F;
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param->sampling_h[i] = byte & 0x0F;
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param->qtbl_num[i] = read_byte(&stream);
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if (param->qtbl_num[i] == -1)
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break;
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}
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notfound = !(i == param->comp_num);
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break;
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case RST ... RST + 7:
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case SOI:
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case EOI:
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case TEM:
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break;
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default:
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if (read_word_be(&stream, &word))
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break;
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length = (long)word - 2;
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read_skip(&stream, length);
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break;
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}
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}
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return !notfound;
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}
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bool mtk_jpeg_parse(struct mtk_jpeg_dec_param *param, u8 *src_addr_va,
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u32 src_size)
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{
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if (!mtk_jpeg_do_parse(param, src_addr_va, src_size))
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return false;
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if (mtk_jpeg_dec_fill_param(param))
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return false;
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return true;
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}
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