1802d0beec
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
153 lines
2.7 KiB
C
153 lines
2.7 KiB
C
// 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_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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