848 lines
20 KiB
C
848 lines
20 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/bitmap.h>
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#include <grub/types.h>
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/bufio.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* Uncomment following define to enable JPEG debug. */
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//#define JPEG_DEBUG
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#define JPEG_ESC_CHAR 0xFF
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#define JPEG_SAMPLING_1x1 0x11
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enum
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{
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JPEG_MARKER_SOF0 = 0xc0,
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JPEG_MARKER_DHT = 0xc4,
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JPEG_MARKER_SOI = 0xd8,
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JPEG_MARKER_EOI = 0xd9,
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JPEG_MARKER_RST0 = 0xd0,
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JPEG_MARKER_RST1 = 0xd1,
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JPEG_MARKER_RST2 = 0xd2,
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JPEG_MARKER_RST3 = 0xd3,
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JPEG_MARKER_RST4 = 0xd4,
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JPEG_MARKER_RST5 = 0xd5,
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JPEG_MARKER_RST6 = 0xd6,
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JPEG_MARKER_RST7 = 0xd7,
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JPEG_MARKER_SOS = 0xda,
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JPEG_MARKER_DQT = 0xdb,
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JPEG_MARKER_DRI = 0xdd,
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};
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#define SHIFT_BITS 8
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#define CONST(x) ((int) ((x) * (1L << SHIFT_BITS) + 0.5))
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#define JPEG_UNIT_SIZE 8
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static const grub_uint8_t jpeg_zigzag_order[64] = {
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0, 1, 8, 16, 9, 2, 3, 10,
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17, 24, 32, 25, 18, 11, 4, 5,
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12, 19, 26, 33, 40, 48, 41, 34,
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27, 20, 13, 6, 7, 14, 21, 28,
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35, 42, 49, 56, 57, 50, 43, 36,
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29, 22, 15, 23, 30, 37, 44, 51,
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58, 59, 52, 45, 38, 31, 39, 46,
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53, 60, 61, 54, 47, 55, 62, 63
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};
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#ifdef JPEG_DEBUG
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static grub_command_t cmd;
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#endif
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typedef int jpeg_data_unit_t[64];
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struct grub_jpeg_data
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{
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grub_file_t file;
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struct grub_video_bitmap **bitmap;
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grub_uint8_t *bitmap_ptr;
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int image_width;
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int image_height;
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grub_uint8_t *huff_value[4];
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int huff_offset[4][16];
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int huff_maxval[4][16];
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grub_uint8_t quan_table[2][64];
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int comp_index[3][3];
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jpeg_data_unit_t ydu[4];
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jpeg_data_unit_t crdu;
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jpeg_data_unit_t cbdu;
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int vs, hs;
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int dri;
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int r1;
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int dc_value[3];
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int color_components;
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int bit_mask, bit_save;
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};
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static grub_uint8_t
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grub_jpeg_get_byte (struct grub_jpeg_data *data)
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{
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grub_uint8_t r;
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r = 0;
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grub_file_read (data->file, &r, 1);
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return r;
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}
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static grub_uint16_t
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grub_jpeg_get_word (struct grub_jpeg_data *data)
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{
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grub_uint16_t r;
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r = 0;
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grub_file_read (data->file, &r, sizeof (grub_uint16_t));
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return grub_be_to_cpu16 (r);
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}
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static int
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grub_jpeg_get_bit (struct grub_jpeg_data *data)
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{
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int ret;
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if (data->bit_mask == 0)
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{
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data->bit_save = grub_jpeg_get_byte (data);
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if (data->bit_save == JPEG_ESC_CHAR)
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{
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if (grub_jpeg_get_byte (data) != 0)
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: invalid 0xFF in data stream");
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return 0;
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}
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}
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data->bit_mask = 0x80;
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}
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ret = ((data->bit_save & data->bit_mask) != 0);
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data->bit_mask >>= 1;
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return ret;
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}
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static int
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grub_jpeg_get_number (struct grub_jpeg_data *data, int num)
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{
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int value, i, msb;
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if (num == 0)
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return 0;
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msb = value = grub_jpeg_get_bit (data);
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for (i = 1; i < num; i++)
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value = (value << 1) + (grub_jpeg_get_bit (data) != 0);
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if (!msb)
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value += 1 - (1 << num);
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return value;
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}
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static int
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grub_jpeg_get_huff_code (struct grub_jpeg_data *data, int id)
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{
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int code;
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unsigned i;
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code = 0;
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for (i = 0; i < ARRAY_SIZE (data->huff_maxval[id]); i++)
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{
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code <<= 1;
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if (grub_jpeg_get_bit (data))
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code++;
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if (code < data->huff_maxval[id][i])
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return data->huff_value[id][code + data->huff_offset[id][i]];
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}
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: huffman decode fails");
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return 0;
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}
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static grub_err_t
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grub_jpeg_decode_huff_table (struct grub_jpeg_data *data)
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{
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int id, ac, n, base, ofs;
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grub_uint32_t next_marker;
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grub_uint8_t count[16];
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unsigned i;
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next_marker = data->file->offset;
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next_marker += grub_jpeg_get_word (data);
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while (data->file->offset + sizeof (count) + 1 <= next_marker)
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{
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id = grub_jpeg_get_byte (data);
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ac = (id >> 4) & 1;
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id &= 0xF;
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if (id > 1)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: too many huffman tables");
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if (grub_file_read (data->file, &count, sizeof (count)) !=
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sizeof (count))
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return grub_errno;
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n = 0;
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for (i = 0; i < ARRAY_SIZE (count); i++)
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n += count[i];
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id += ac * 2;
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data->huff_value[id] = grub_malloc (n);
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if (grub_errno)
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return grub_errno;
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if (grub_file_read (data->file, data->huff_value[id], n) != n)
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return grub_errno;
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base = 0;
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ofs = 0;
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for (i = 0; i < ARRAY_SIZE (count); i++)
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{
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base += count[i];
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ofs += count[i];
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data->huff_maxval[id][i] = base;
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data->huff_offset[id][i] = ofs - base;
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base <<= 1;
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}
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}
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if (data->file->offset != next_marker)
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: extra byte in huffman table");
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return grub_errno;
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}
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static grub_err_t
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grub_jpeg_decode_quan_table (struct grub_jpeg_data *data)
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{
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int id;
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grub_uint32_t next_marker;
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next_marker = data->file->offset;
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next_marker += grub_jpeg_get_word (data);
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while (data->file->offset + sizeof (data->quan_table[id]) + 1
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<= next_marker)
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{
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id = grub_jpeg_get_byte (data);
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if (id >= 0x10) /* Upper 4-bit is precision. */
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: only 8-bit precision is supported");
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if (id > 1)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: too many quantization tables");
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if (grub_file_read (data->file, &data->quan_table[id],
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sizeof (data->quan_table[id]))
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!= sizeof (data->quan_table[id]))
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return grub_errno;
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}
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if (data->file->offset != next_marker)
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grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: extra byte in quantization table");
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return grub_errno;
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}
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static grub_err_t
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grub_jpeg_decode_sof (struct grub_jpeg_data *data)
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{
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int i, cc;
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grub_uint32_t next_marker;
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next_marker = data->file->offset;
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next_marker += grub_jpeg_get_word (data);
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if (grub_jpeg_get_byte (data) != 8)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: only 8-bit precision is supported");
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data->image_height = grub_jpeg_get_word (data);
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data->image_width = grub_jpeg_get_word (data);
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if ((!data->image_height) || (!data->image_width))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid image size");
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cc = grub_jpeg_get_byte (data);
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if (cc != 1 && cc != 3)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: component count must be 1 or 3");
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data->color_components = cc;
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for (i = 0; i < cc; i++)
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{
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int id, ss;
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id = grub_jpeg_get_byte (data) - 1;
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if ((id < 0) || (id >= 3))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid index");
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ss = grub_jpeg_get_byte (data); /* Sampling factor. */
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if (!id)
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{
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data->vs = ss & 0xF; /* Vertical sampling. */
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data->hs = ss >> 4; /* Horizontal sampling. */
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if ((data->vs > 2) || (data->hs > 2))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: sampling method not supported");
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}
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else if (ss != JPEG_SAMPLING_1x1)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: sampling method not supported");
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data->comp_index[id][0] = grub_jpeg_get_byte (data);
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}
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if (data->file->offset != next_marker)
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: extra byte in sof");
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return grub_errno;
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}
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static grub_err_t
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grub_jpeg_decode_dri (struct grub_jpeg_data *data)
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{
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if (grub_jpeg_get_word (data) != 4)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"jpeg: DRI marker length must be 4");
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data->dri = grub_jpeg_get_word (data);
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return grub_errno;
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}
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static void
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grub_jpeg_idct_transform (jpeg_data_unit_t du)
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{
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int *pd;
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int i;
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int t0, t1, t2, t3, t4, t5, t6, t7;
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int v0, v1, v2, v3, v4;
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pd = du;
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for (i = 0; i < JPEG_UNIT_SIZE; i++, pd++)
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{
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if ((pd[JPEG_UNIT_SIZE * 1] | pd[JPEG_UNIT_SIZE * 2] |
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pd[JPEG_UNIT_SIZE * 3] | pd[JPEG_UNIT_SIZE * 4] |
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pd[JPEG_UNIT_SIZE * 5] | pd[JPEG_UNIT_SIZE * 6] |
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pd[JPEG_UNIT_SIZE * 7]) == 0)
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{
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pd[JPEG_UNIT_SIZE * 0] <<= SHIFT_BITS;
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pd[JPEG_UNIT_SIZE * 1] = pd[JPEG_UNIT_SIZE * 2]
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= pd[JPEG_UNIT_SIZE * 3] = pd[JPEG_UNIT_SIZE * 4]
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= pd[JPEG_UNIT_SIZE * 5] = pd[JPEG_UNIT_SIZE * 6]
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= pd[JPEG_UNIT_SIZE * 7] = pd[JPEG_UNIT_SIZE * 0];
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continue;
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}
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t0 = pd[JPEG_UNIT_SIZE * 0];
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t1 = pd[JPEG_UNIT_SIZE * 2];
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t2 = pd[JPEG_UNIT_SIZE * 4];
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t3 = pd[JPEG_UNIT_SIZE * 6];
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v4 = (t1 + t3) * CONST (0.541196100);
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v0 = ((t0 + t2) << SHIFT_BITS);
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v1 = ((t0 - t2) << SHIFT_BITS);
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v2 = v4 - t3 * CONST (1.847759065);
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v3 = v4 + t1 * CONST (0.765366865);
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t0 = v0 + v3;
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t3 = v0 - v3;
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t1 = v1 + v2;
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t2 = v1 - v2;
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t4 = pd[JPEG_UNIT_SIZE * 7];
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t5 = pd[JPEG_UNIT_SIZE * 5];
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t6 = pd[JPEG_UNIT_SIZE * 3];
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t7 = pd[JPEG_UNIT_SIZE * 1];
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v0 = t4 + t7;
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v1 = t5 + t6;
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v2 = t4 + t6;
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v3 = t5 + t7;
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v4 = (v2 + v3) * CONST (1.175875602);
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v0 *= CONST (0.899976223);
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v1 *= CONST (2.562915447);
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v2 = v2 * CONST (1.961570560) - v4;
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v3 = v3 * CONST (0.390180644) - v4;
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t4 = t4 * CONST (0.298631336) - v0 - v2;
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t5 = t5 * CONST (2.053119869) - v1 - v3;
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t6 = t6 * CONST (3.072711026) - v1 - v2;
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t7 = t7 * CONST (1.501321110) - v0 - v3;
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pd[JPEG_UNIT_SIZE * 0] = t0 + t7;
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pd[JPEG_UNIT_SIZE * 7] = t0 - t7;
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pd[JPEG_UNIT_SIZE * 1] = t1 + t6;
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pd[JPEG_UNIT_SIZE * 6] = t1 - t6;
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pd[JPEG_UNIT_SIZE * 2] = t2 + t5;
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pd[JPEG_UNIT_SIZE * 5] = t2 - t5;
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pd[JPEG_UNIT_SIZE * 3] = t3 + t4;
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pd[JPEG_UNIT_SIZE * 4] = t3 - t4;
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}
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pd = du;
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for (i = 0; i < JPEG_UNIT_SIZE; i++, pd += JPEG_UNIT_SIZE)
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{
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if ((pd[1] | pd[2] | pd[3] | pd[4] | pd[5] | pd[6] | pd[7]) == 0)
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{
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pd[0] >>= (SHIFT_BITS + 3);
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pd[1] = pd[2] = pd[3] = pd[4] = pd[5] = pd[6] = pd[7] = pd[0];
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continue;
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}
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v4 = (pd[2] + pd[6]) * CONST (0.541196100);
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v0 = (pd[0] + pd[4]) << SHIFT_BITS;
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v1 = (pd[0] - pd[4]) << SHIFT_BITS;
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v2 = v4 - pd[6] * CONST (1.847759065);
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v3 = v4 + pd[2] * CONST (0.765366865);
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t0 = v0 + v3;
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t3 = v0 - v3;
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t1 = v1 + v2;
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t2 = v1 - v2;
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t4 = pd[7];
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t5 = pd[5];
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t6 = pd[3];
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t7 = pd[1];
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v0 = t4 + t7;
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v1 = t5 + t6;
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v2 = t4 + t6;
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v3 = t5 + t7;
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v4 = (v2 + v3) * CONST (1.175875602);
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v0 *= CONST (0.899976223);
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v1 *= CONST (2.562915447);
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v2 = v2 * CONST (1.961570560) - v4;
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v3 = v3 * CONST (0.390180644) - v4;
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t4 = t4 * CONST (0.298631336) - v0 - v2;
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t5 = t5 * CONST (2.053119869) - v1 - v3;
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t6 = t6 * CONST (3.072711026) - v1 - v2;
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t7 = t7 * CONST (1.501321110) - v0 - v3;
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pd[0] = (t0 + t7) >> (SHIFT_BITS * 2 + 3);
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pd[7] = (t0 - t7) >> (SHIFT_BITS * 2 + 3);
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pd[1] = (t1 + t6) >> (SHIFT_BITS * 2 + 3);
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pd[6] = (t1 - t6) >> (SHIFT_BITS * 2 + 3);
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pd[2] = (t2 + t5) >> (SHIFT_BITS * 2 + 3);
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pd[5] = (t2 - t5) >> (SHIFT_BITS * 2 + 3);
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pd[3] = (t3 + t4) >> (SHIFT_BITS * 2 + 3);
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pd[4] = (t3 - t4) >> (SHIFT_BITS * 2 + 3);
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}
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for (i = 0; i < JPEG_UNIT_SIZE * JPEG_UNIT_SIZE; i++)
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{
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du[i] += 128;
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if (du[i] < 0)
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du[i] = 0;
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if (du[i] > 255)
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du[i] = 255;
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}
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}
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static void
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grub_jpeg_decode_du (struct grub_jpeg_data *data, int id, jpeg_data_unit_t du)
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{
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int h1, h2, qt;
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unsigned pos;
|
|
|
|
grub_memset (du, 0, sizeof (jpeg_data_unit_t));
|
|
|
|
qt = data->comp_index[id][0];
|
|
h1 = data->comp_index[id][1];
|
|
h2 = data->comp_index[id][2];
|
|
|
|
data->dc_value[id] +=
|
|
grub_jpeg_get_number (data, grub_jpeg_get_huff_code (data, h1));
|
|
|
|
du[0] = data->dc_value[id] * (int) data->quan_table[qt][0];
|
|
pos = 1;
|
|
while (pos < ARRAY_SIZE (data->quan_table[qt]))
|
|
{
|
|
int num, val;
|
|
|
|
num = grub_jpeg_get_huff_code (data, h2);
|
|
if (!num)
|
|
break;
|
|
|
|
val = grub_jpeg_get_number (data, num & 0xF);
|
|
num >>= 4;
|
|
pos += num;
|
|
du[jpeg_zigzag_order[pos]] = val * (int) data->quan_table[qt][pos];
|
|
pos++;
|
|
}
|
|
|
|
grub_jpeg_idct_transform (du);
|
|
}
|
|
|
|
static void
|
|
grub_jpeg_ycrcb_to_rgb (int yy, int cr, int cb, grub_uint8_t * rgb)
|
|
{
|
|
int dd;
|
|
|
|
cr -= 128;
|
|
cb -= 128;
|
|
|
|
/* Red */
|
|
dd = yy + ((cr * CONST (1.402)) >> SHIFT_BITS);
|
|
if (dd < 0)
|
|
dd = 0;
|
|
if (dd > 255)
|
|
dd = 255;
|
|
#ifdef GRUB_CPU_WORDS_BIGENDIAN
|
|
rgb[2] = dd;
|
|
#else
|
|
*(rgb++) = dd;
|
|
#endif
|
|
|
|
/* Green */
|
|
dd = yy - ((cb * CONST (0.34414) + cr * CONST (0.71414)) >> SHIFT_BITS);
|
|
if (dd < 0)
|
|
dd = 0;
|
|
if (dd > 255)
|
|
dd = 255;
|
|
#ifdef GRUB_CPU_WORDS_BIGENDIAN
|
|
rgb[1] = dd;
|
|
#else
|
|
*(rgb++) = dd;
|
|
#endif
|
|
|
|
/* Blue */
|
|
dd = yy + ((cb * CONST (1.772)) >> SHIFT_BITS);
|
|
if (dd < 0)
|
|
dd = 0;
|
|
if (dd > 255)
|
|
dd = 255;
|
|
#ifdef GRUB_CPU_WORDS_BIGENDIAN
|
|
rgb[0] = dd;
|
|
rgb += 3;
|
|
#else
|
|
*(rgb++) = dd;
|
|
#endif
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_jpeg_decode_sos (struct grub_jpeg_data *data)
|
|
{
|
|
int i, cc;
|
|
grub_uint32_t data_offset;
|
|
|
|
data_offset = data->file->offset;
|
|
data_offset += grub_jpeg_get_word (data);
|
|
|
|
cc = grub_jpeg_get_byte (data);
|
|
|
|
if (cc != 3 && cc != 1)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
"jpeg: component count must be 1 or 3");
|
|
data->color_components = cc;
|
|
|
|
for (i = 0; i < cc; i++)
|
|
{
|
|
int id, ht;
|
|
|
|
id = grub_jpeg_get_byte (data) - 1;
|
|
if ((id < 0) || (id >= 3))
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid index");
|
|
|
|
ht = grub_jpeg_get_byte (data);
|
|
data->comp_index[id][1] = (ht >> 4);
|
|
data->comp_index[id][2] = (ht & 0xF) + 2;
|
|
}
|
|
|
|
grub_jpeg_get_byte (data); /* Skip 3 unused bytes. */
|
|
grub_jpeg_get_word (data);
|
|
|
|
if (data->file->offset != data_offset)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: extra byte in sos");
|
|
|
|
if (grub_video_bitmap_create (data->bitmap, data->image_width,
|
|
data->image_height,
|
|
GRUB_VIDEO_BLIT_FORMAT_RGB_888))
|
|
return grub_errno;
|
|
|
|
data->bitmap_ptr = (*data->bitmap)->data;
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_jpeg_decode_data (struct grub_jpeg_data *data)
|
|
{
|
|
int c1, vb, hb, nr1, nc1;
|
|
int rst = data->dri;
|
|
|
|
vb = data->vs * 8;
|
|
hb = data->hs * 8;
|
|
nr1 = (data->image_height + vb - 1) / vb;
|
|
nc1 = (data->image_width + hb - 1) / hb;
|
|
|
|
for (; data->r1 < nr1 && (!data->dri || rst);
|
|
data->r1++, data->bitmap_ptr += (vb * data->image_width - hb * nc1) * 3)
|
|
for (c1 = 0; c1 < nc1 && (!data->dri || rst);
|
|
c1++, rst--, data->bitmap_ptr += hb * 3)
|
|
{
|
|
int r2, c2, nr2, nc2;
|
|
grub_uint8_t *ptr2;
|
|
|
|
for (r2 = 0; r2 < data->vs; r2++)
|
|
for (c2 = 0; c2 < data->hs; c2++)
|
|
grub_jpeg_decode_du (data, 0, data->ydu[r2 * 2 + c2]);
|
|
|
|
if (data->color_components >= 3)
|
|
{
|
|
grub_jpeg_decode_du (data, 1, data->cbdu);
|
|
grub_jpeg_decode_du (data, 2, data->crdu);
|
|
}
|
|
|
|
if (grub_errno)
|
|
return grub_errno;
|
|
|
|
nr2 = (data->r1 == nr1 - 1) ? (data->image_height - data->r1 * vb) : vb;
|
|
nc2 = (c1 == nc1 - 1) ? (data->image_width - c1 * hb) : hb;
|
|
|
|
ptr2 = data->bitmap_ptr;
|
|
for (r2 = 0; r2 < nr2; r2++, ptr2 += (data->image_width - nc2) * 3)
|
|
for (c2 = 0; c2 < nc2; c2++, ptr2 += 3)
|
|
{
|
|
int i0, yy;
|
|
|
|
i0 = (r2 / data->vs) * 8 + (c2 / data->hs);
|
|
yy = data->ydu[(r2 / 8) * 2 + (c2 / 8)][(r2 % 8) * 8 + (c2 % 8)];
|
|
|
|
if (data->color_components >= 3)
|
|
{
|
|
int cr, cb;
|
|
cr = data->crdu[i0];
|
|
cb = data->cbdu[i0];
|
|
grub_jpeg_ycrcb_to_rgb (yy, cr, cb, ptr2);
|
|
}
|
|
else
|
|
{
|
|
ptr2[0] = yy;
|
|
ptr2[1] = yy;
|
|
ptr2[2] = yy;
|
|
}
|
|
}
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static void
|
|
grub_jpeg_reset (struct grub_jpeg_data *data)
|
|
{
|
|
data->bit_mask = 0x0;
|
|
|
|
data->dc_value[0] = 0;
|
|
data->dc_value[1] = 0;
|
|
data->dc_value[2] = 0;
|
|
}
|
|
|
|
static grub_uint8_t
|
|
grub_jpeg_get_marker (struct grub_jpeg_data *data)
|
|
{
|
|
grub_uint8_t r;
|
|
|
|
r = grub_jpeg_get_byte (data);
|
|
|
|
if (r != JPEG_ESC_CHAR)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid maker");
|
|
return 0;
|
|
}
|
|
|
|
return grub_jpeg_get_byte (data);
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_jpeg_decode_jpeg (struct grub_jpeg_data *data)
|
|
{
|
|
if (grub_jpeg_get_marker (data) != JPEG_MARKER_SOI) /* Start Of Image. */
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid jpeg file");
|
|
|
|
while (grub_errno == 0)
|
|
{
|
|
grub_uint8_t marker;
|
|
|
|
marker = grub_jpeg_get_marker (data);
|
|
if (grub_errno)
|
|
break;
|
|
|
|
grub_dprintf ("jpeg", "jpeg marker: %x\n", marker);
|
|
|
|
switch (marker)
|
|
{
|
|
case JPEG_MARKER_DHT: /* Define Huffman Table. */
|
|
grub_jpeg_decode_huff_table (data);
|
|
break;
|
|
case JPEG_MARKER_DQT: /* Define Quantization Table. */
|
|
grub_jpeg_decode_quan_table (data);
|
|
break;
|
|
case JPEG_MARKER_SOF0: /* Start Of Frame 0. */
|
|
grub_jpeg_decode_sof (data);
|
|
break;
|
|
case JPEG_MARKER_DRI: /* Define Restart Interval. */
|
|
grub_jpeg_decode_dri (data);
|
|
break;
|
|
case JPEG_MARKER_SOS: /* Start Of Scan. */
|
|
if (grub_jpeg_decode_sos (data))
|
|
break;
|
|
case JPEG_MARKER_RST0: /* Restart. */
|
|
case JPEG_MARKER_RST1:
|
|
case JPEG_MARKER_RST2:
|
|
case JPEG_MARKER_RST3:
|
|
case JPEG_MARKER_RST4:
|
|
case JPEG_MARKER_RST5:
|
|
case JPEG_MARKER_RST6:
|
|
case JPEG_MARKER_RST7:
|
|
grub_jpeg_decode_data (data);
|
|
grub_jpeg_reset (data);
|
|
break;
|
|
case JPEG_MARKER_EOI: /* End Of Image. */
|
|
return grub_errno;
|
|
default: /* Skip unrecognized marker. */
|
|
{
|
|
grub_uint16_t sz;
|
|
|
|
sz = grub_jpeg_get_word (data);
|
|
if (grub_errno)
|
|
return (grub_errno);
|
|
grub_file_seek (data->file, data->file->offset + sz - 2);
|
|
}
|
|
}
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_video_reader_jpeg (struct grub_video_bitmap **bitmap,
|
|
const char *filename)
|
|
{
|
|
grub_file_t file;
|
|
struct grub_jpeg_data *data;
|
|
|
|
file = grub_buffile_open (filename, 0);
|
|
if (!file)
|
|
return grub_errno;
|
|
|
|
data = grub_zalloc (sizeof (*data));
|
|
if (data != NULL)
|
|
{
|
|
int i;
|
|
|
|
data->file = file;
|
|
data->bitmap = bitmap;
|
|
grub_jpeg_decode_jpeg (data);
|
|
|
|
for (i = 0; i < 4; i++)
|
|
grub_free (data->huff_value[i]);
|
|
|
|
grub_free (data);
|
|
}
|
|
|
|
if (grub_errno != GRUB_ERR_NONE)
|
|
{
|
|
grub_video_bitmap_destroy (*bitmap);
|
|
*bitmap = 0;
|
|
}
|
|
|
|
grub_file_close (file);
|
|
return grub_errno;
|
|
}
|
|
|
|
#if defined(JPEG_DEBUG)
|
|
static grub_err_t
|
|
grub_cmd_jpegtest (grub_command_t cmdd __attribute__ ((unused)),
|
|
int argc, char **args)
|
|
{
|
|
struct grub_video_bitmap *bitmap = 0;
|
|
|
|
if (argc != 1)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
|
|
|
|
grub_video_reader_jpeg (&bitmap, args[0]);
|
|
if (grub_errno != GRUB_ERR_NONE)
|
|
return grub_errno;
|
|
|
|
grub_video_bitmap_destroy (bitmap);
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
#endif
|
|
|
|
static struct grub_video_bitmap_reader jpg_reader = {
|
|
.extension = ".jpg",
|
|
.reader = grub_video_reader_jpeg,
|
|
.next = 0
|
|
};
|
|
|
|
static struct grub_video_bitmap_reader jpeg_reader = {
|
|
.extension = ".jpeg",
|
|
.reader = grub_video_reader_jpeg,
|
|
.next = 0
|
|
};
|
|
|
|
GRUB_MOD_INIT (jpeg)
|
|
{
|
|
grub_video_bitmap_reader_register (&jpg_reader);
|
|
grub_video_bitmap_reader_register (&jpeg_reader);
|
|
#if defined(JPEG_DEBUG)
|
|
cmd = grub_register_command ("jpegtest", grub_cmd_jpegtest,
|
|
"FILE", "Tests loading of JPEG bitmap.");
|
|
#endif
|
|
}
|
|
|
|
GRUB_MOD_FINI (jpeg)
|
|
{
|
|
#if defined(JPEG_DEBUG)
|
|
grub_unregister_command (cmd);
|
|
#endif
|
|
grub_video_bitmap_reader_unregister (&jpeg_reader);
|
|
grub_video_bitmap_reader_unregister (&jpg_reader);
|
|
}
|