914 lines
20 KiB
C
914 lines
20 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 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 PNG debug. */
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//#define PNG_DEBUG
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#define PNG_COLOR_MASK_PALETTE 1
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#define PNG_COLOR_MASK_COLOR 2
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#define PNG_COLOR_MASK_ALPHA 4
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#define PNG_COLOR_TYPE_GRAY 0
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#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
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#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
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#define PNG_COLOR_TYPE_RGBA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
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#define PNG_COLOR_TYPE_GRAYA (PNG_COLOR_MASK_ALPHA)
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#define PNG_COMPRESSION_BASE 0
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#define PNG_INTERLACE_NONE 0
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#define PNG_INTERLACE_ADAM7 1
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#define PNG_FILTER_TYPE_BASE 0
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#define PNG_FILTER_VALUE_NONE 0
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#define PNG_FILTER_VALUE_SUB 1
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#define PNG_FILTER_VALUE_UP 2
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#define PNG_FILTER_VALUE_AVG 3
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#define PNG_FILTER_VALUE_PAETH 4
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#define PNG_FILTER_VALUE_LAST 5
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#define PNG_CHUNK_IHDR 0x49484452
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#define PNG_CHUNK_IDAT 0x49444154
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#define PNG_CHUNK_IEND 0x49454e44
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#define Z_DEFLATED 8
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#define Z_FLAG_DICT 32
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#define INFLATE_STORED 0
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#define INFLATE_FIXED 1
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#define INFLATE_DYNAMIC 2
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#define WSIZE 0x8000
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#define DEFLATE_HCLEN_BASE 4
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#define DEFLATE_HCLEN_MAX 19
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#define DEFLATE_HLIT_BASE 257
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#define DEFLATE_HLIT_MAX 288
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#define DEFLATE_HDIST_BASE 1
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#define DEFLATE_HDIST_MAX 30
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#define DEFLATE_HUFF_LEN 16
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#ifdef PNG_DEBUG
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static grub_command_t cmd;
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#endif
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struct huff_table
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{
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int *values, *maxval, *offset;
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int num_values, max_length;
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};
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struct grub_png_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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int bit_count, bit_save;
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grub_uint32_t next_offset;
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int image_width, image_height, bpp, is_16bit, raw_bytes;
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grub_uint8_t *image_data;
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int inside_idat, idat_remain;
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int code_values[DEFLATE_HLIT_MAX];
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int code_maxval[DEFLATE_HUFF_LEN];
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int code_offset[DEFLATE_HUFF_LEN];
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int dist_values[DEFLATE_HDIST_MAX];
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int dist_maxval[DEFLATE_HUFF_LEN];
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int dist_offset[DEFLATE_HUFF_LEN];
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struct huff_table code_table;
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struct huff_table dist_table;
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grub_uint8_t slide[WSIZE];
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int wp;
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grub_uint8_t *cur_rgb;
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int cur_column, cur_filter, first_line;
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};
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static grub_uint32_t
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grub_png_get_dword (struct grub_png_data *data)
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{
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grub_uint32_t r;
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r = 0;
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grub_file_read (data->file, &r, sizeof (grub_uint32_t));
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return grub_be_to_cpu32 (r);
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}
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static grub_uint8_t
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grub_png_get_byte (struct grub_png_data *data)
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{
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grub_uint8_t r;
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if ((data->inside_idat) && (data->idat_remain == 0))
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{
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grub_uint32_t len, type;
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do
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{
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/* Skip crc checksum. */
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grub_png_get_dword (data);
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if (data->file->offset != data->next_offset)
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: chunk size error");
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return 0;
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}
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len = grub_png_get_dword (data);
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type = grub_png_get_dword (data);
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if (type != PNG_CHUNK_IDAT)
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: unexpected end of data");
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return 0;
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}
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data->next_offset = data->file->offset + len + 4;
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}
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while (len == 0);
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data->idat_remain = len;
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}
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r = 0;
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grub_file_read (data->file, &r, 1);
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if (data->inside_idat)
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data->idat_remain--;
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return r;
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}
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static int
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grub_png_get_bits (struct grub_png_data *data, int num)
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{
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int code, shift;
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if (data->bit_count == 0)
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{
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data->bit_save = grub_png_get_byte (data);
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data->bit_count = 8;
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}
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code = 0;
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shift = 0;
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while (grub_errno == 0)
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{
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int n;
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n = data->bit_count;
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if (n > num)
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n = num;
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code += (int) (data->bit_save & ((1 << n) - 1)) << shift;
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num -= n;
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if (!num)
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{
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data->bit_count -= n;
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data->bit_save >>= n;
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break;
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}
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shift += n;
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data->bit_save = grub_png_get_byte (data);
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data->bit_count = 8;
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}
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return code;
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}
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static grub_err_t
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grub_png_decode_image_header (struct grub_png_data *data)
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{
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int color_type;
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int color_bits;
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data->image_width = grub_png_get_dword (data);
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data->image_height = grub_png_get_dword (data);
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if ((!data->image_height) || (!data->image_width))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: invalid image size");
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color_bits = grub_png_get_byte (data);
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if ((color_bits != 8) && (color_bits != 16))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: bit depth must be 8 or 16");
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data->is_16bit = (color_bits == 16);
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color_type = grub_png_get_byte (data);
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if (color_type == PNG_COLOR_TYPE_RGB)
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{
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if (grub_video_bitmap_create (data->bitmap, data->image_width,
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data->image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGB_888))
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return grub_errno;
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data->bpp = 3;
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}
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else if (color_type == PNG_COLOR_TYPE_RGBA)
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{
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if (grub_video_bitmap_create (data->bitmap, data->image_width,
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data->image_height,
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GRUB_VIDEO_BLIT_FORMAT_RGBA_8888))
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return grub_errno;
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data->bpp = 4;
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}
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else
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: color type not supported");
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if (data->is_16bit)
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{
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data->bpp <<= 1;
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data->image_data = grub_malloc (data->image_height *
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data->image_width * data->bpp);
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if (grub_errno)
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return grub_errno;
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data->cur_rgb = data->image_data;
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}
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else
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{
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data->image_data = 0;
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data->cur_rgb = (*data->bitmap)->data;
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}
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data->raw_bytes = data->image_height * (data->image_width + 1) * data->bpp;
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data->cur_column = 0;
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data->first_line = 1;
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if (grub_png_get_byte (data) != PNG_COMPRESSION_BASE)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: compression method not supported");
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if (grub_png_get_byte (data) != PNG_FILTER_TYPE_BASE)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: filter method not supported");
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if (grub_png_get_byte (data) != PNG_INTERLACE_NONE)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE,
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"png: interlace method not supported");
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/* Skip crc checksum. */
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grub_png_get_dword (data);
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return grub_errno;
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}
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/* Order of the bit length code lengths. */
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static const grub_uint8_t bitorder[] = {
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16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
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};
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/* Copy lengths for literal codes 257..285. */
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static const int cplens[] = {
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3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
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35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
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};
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/* Extra bits for literal codes 257..285. */
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static const grub_uint8_t cplext[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
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3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
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}; /* 99==invalid */
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/* Copy offsets for distance codes 0..29. */
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static const int cpdist[] = {
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1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
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257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
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8193, 12289, 16385, 24577
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};
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/* Extra bits for distance codes. */
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static const grub_uint8_t cpdext[] = {
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0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
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7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
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12, 12, 13, 13
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};
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static void
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grub_png_init_huff_table (struct huff_table *ht, int cur_maxlen,
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int *cur_values, int *cur_maxval, int *cur_offset)
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{
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ht->values = cur_values;
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ht->maxval = cur_maxval;
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ht->offset = cur_offset;
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ht->num_values = 0;
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ht->max_length = cur_maxlen;
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grub_memset (cur_maxval, 0, sizeof (int) * cur_maxlen);
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}
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static void
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grub_png_insert_huff_item (struct huff_table *ht, int code, int len)
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{
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int i, n;
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if (len == 0)
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return;
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if (len > ht->max_length)
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{
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grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: invalid code length");
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return;
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}
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n = 0;
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for (i = len; i < ht->max_length; i++)
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n += ht->maxval[i];
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for (i = 0; i < n; i++)
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ht->values[ht->num_values - i] = ht->values[ht->num_values - i - 1];
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ht->values[ht->num_values - n] = code;
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ht->num_values++;
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ht->maxval[len - 1]++;
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}
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static void
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grub_png_build_huff_table (struct huff_table *ht)
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{
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int base, ofs, i;
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base = 0;
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ofs = 0;
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for (i = 0; i < ht->max_length; i++)
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{
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base += ht->maxval[i];
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ofs += ht->maxval[i];
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ht->maxval[i] = base;
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ht->offset[i] = ofs - base;
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base <<= 1;
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}
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}
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static int
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grub_png_get_huff_code (struct grub_png_data *data, struct huff_table *ht)
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{
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int code, i;
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code = 0;
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for (i = 0; i < ht->max_length; i++)
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{
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code = (code << 1) + grub_png_get_bits (data, 1);
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if (code < ht->maxval[i])
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return ht->values[code + ht->offset[i]];
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}
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return 0;
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}
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static grub_err_t
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grub_png_init_fixed_block (struct grub_png_data *data)
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{
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int i;
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grub_png_init_huff_table (&data->code_table, DEFLATE_HUFF_LEN,
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data->code_values, data->code_maxval,
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data->code_offset);
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for (i = 0; i < 144; i++)
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grub_png_insert_huff_item (&data->code_table, i, 8);
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for (; i < 256; i++)
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grub_png_insert_huff_item (&data->code_table, i, 9);
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for (; i < 280; i++)
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grub_png_insert_huff_item (&data->code_table, i, 7);
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for (; i < DEFLATE_HLIT_MAX; i++)
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grub_png_insert_huff_item (&data->code_table, i, 8);
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grub_png_build_huff_table (&data->code_table);
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grub_png_init_huff_table (&data->dist_table, DEFLATE_HUFF_LEN,
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data->dist_values, data->dist_maxval,
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data->dist_offset);
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for (i = 0; i < DEFLATE_HDIST_MAX; i++)
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grub_png_insert_huff_item (&data->dist_table, i, 5);
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grub_png_build_huff_table (&data->dist_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_png_init_dynamic_block (struct grub_png_data *data)
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{
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int nl, nd, nb, i, prev;
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struct huff_table cl;
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int cl_values[sizeof (bitorder)];
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int cl_maxval[8];
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int cl_offset[8];
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grub_uint8_t lens[DEFLATE_HCLEN_MAX];
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nl = DEFLATE_HLIT_BASE + grub_png_get_bits (data, 5);
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nd = DEFLATE_HDIST_BASE + grub_png_get_bits (data, 5);
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nb = DEFLATE_HCLEN_BASE + grub_png_get_bits (data, 4);
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if ((nl > DEFLATE_HLIT_MAX) || (nd > DEFLATE_HDIST_MAX) ||
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(nb > DEFLATE_HCLEN_MAX))
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: too much data");
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grub_png_init_huff_table (&cl, 8, cl_values, cl_maxval, cl_offset);
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for (i = 0; i < nb; i++)
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lens[bitorder[i]] = grub_png_get_bits (data, 3);
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for (; i < DEFLATE_HCLEN_MAX; i++)
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lens[bitorder[i]] = 0;
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for (i = 0; i < DEFLATE_HCLEN_MAX; i++)
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grub_png_insert_huff_item (&cl, i, lens[i]);
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grub_png_build_huff_table (&cl);
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grub_png_init_huff_table (&data->code_table, DEFLATE_HUFF_LEN,
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data->code_values, data->code_maxval,
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data->code_offset);
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grub_png_init_huff_table (&data->dist_table, DEFLATE_HUFF_LEN,
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data->dist_values, data->dist_maxval,
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data->dist_offset);
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prev = 0;
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for (i = 0; i < nl + nd; i++)
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{
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int n, code;
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struct huff_table *ht;
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if (grub_errno)
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return grub_errno;
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if (i < nl)
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{
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ht = &data->code_table;
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code = i;
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}
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else
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{
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ht = &data->dist_table;
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code = i - nl;
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}
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n = grub_png_get_huff_code (data, &cl);
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if (n < 16)
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{
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grub_png_insert_huff_item (ht, code, n);
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prev = n;
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}
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else if (n == 16)
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{
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int c;
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c = 3 + grub_png_get_bits (data, 2);
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while (c > 0)
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{
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grub_png_insert_huff_item (ht, code++, prev);
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i++;
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c--;
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}
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i--;
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}
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else if (n == 17)
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i += 3 + grub_png_get_bits (data, 3) - 1;
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else
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i += 11 + grub_png_get_bits (data, 7) - 1;
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}
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grub_png_build_huff_table (&data->code_table);
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grub_png_build_huff_table (&data->dist_table);
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return grub_errno;
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}
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static grub_err_t
|
|
grub_png_output_byte (struct grub_png_data *data, grub_uint8_t n)
|
|
{
|
|
int row_bytes;
|
|
|
|
if (--data->raw_bytes < 0)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "image size overflown");
|
|
|
|
if (data->cur_column == 0)
|
|
{
|
|
if (n >= PNG_FILTER_VALUE_LAST)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid filter value");
|
|
|
|
data->cur_filter = n;
|
|
}
|
|
else
|
|
*(data->cur_rgb++) = n;
|
|
|
|
data->cur_column++;
|
|
row_bytes = data->image_width * data->bpp;
|
|
if (data->cur_column == row_bytes + 1)
|
|
{
|
|
grub_uint8_t *blank_line = NULL;
|
|
grub_uint8_t *cur = data->cur_rgb - row_bytes;
|
|
grub_uint8_t *left = cur;
|
|
grub_uint8_t *up;
|
|
|
|
if (data->first_line)
|
|
{
|
|
blank_line = grub_zalloc (row_bytes);
|
|
if (blank_line == NULL)
|
|
return grub_errno;
|
|
|
|
up = blank_line;
|
|
}
|
|
else
|
|
up = cur - row_bytes;
|
|
|
|
switch (data->cur_filter)
|
|
{
|
|
case PNG_FILTER_VALUE_SUB:
|
|
{
|
|
int i;
|
|
|
|
cur += data->bpp;
|
|
for (i = data->bpp; i < row_bytes; i++, cur++, left++)
|
|
*cur += *left;
|
|
|
|
break;
|
|
}
|
|
case PNG_FILTER_VALUE_UP:
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < row_bytes; i++, cur++, up++)
|
|
*cur += *up;
|
|
|
|
break;
|
|
}
|
|
case PNG_FILTER_VALUE_AVG:
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < data->bpp; i++, cur++, up++)
|
|
*cur += *up >> 1;
|
|
|
|
for (; i < row_bytes; i++, cur++, up++, left++)
|
|
*cur += ((int) *up + (int) *left) >> 1;
|
|
|
|
break;
|
|
}
|
|
case PNG_FILTER_VALUE_PAETH:
|
|
{
|
|
int i;
|
|
grub_uint8_t *upper_left = up;
|
|
|
|
for (i = 0; i < data->bpp; i++, cur++, up++)
|
|
*cur += *up;
|
|
|
|
for (; i < row_bytes; i++, cur++, up++, left++, upper_left++)
|
|
{
|
|
int a, b, c, pa, pb, pc;
|
|
|
|
a = *left;
|
|
b = *up;
|
|
c = *upper_left;
|
|
|
|
pa = b - c;
|
|
pb = a - c;
|
|
pc = pa + pb;
|
|
|
|
if (pa < 0)
|
|
pa = -pa;
|
|
|
|
if (pb < 0)
|
|
pb = -pb;
|
|
|
|
if (pc < 0)
|
|
pc = -pc;
|
|
|
|
*cur += ((pa <= pb) && (pa <= pc)) ? a : (pb <= pc) ? b : c;
|
|
}
|
|
}
|
|
}
|
|
|
|
grub_free (blank_line);
|
|
|
|
data->cur_column = 0;
|
|
data->first_line = 0;
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_png_read_dynamic_block (struct grub_png_data *data)
|
|
{
|
|
while (grub_errno == 0)
|
|
{
|
|
int n;
|
|
|
|
n = grub_png_get_huff_code (data, &data->code_table);
|
|
if (n < 256)
|
|
{
|
|
data->slide[data->wp] = n;
|
|
grub_png_output_byte (data, n);
|
|
|
|
data->wp++;
|
|
if (data->wp >= WSIZE)
|
|
data->wp = 0;
|
|
}
|
|
else if (n == 256)
|
|
break;
|
|
else
|
|
{
|
|
int len, dist, pos;
|
|
|
|
n -= 257;
|
|
len = cplens[n];
|
|
if (cplext[n])
|
|
len += grub_png_get_bits (data, cplext[n]);
|
|
|
|
n = grub_png_get_huff_code (data, &data->dist_table);
|
|
dist = cpdist[n];
|
|
if (cpdext[n])
|
|
dist += grub_png_get_bits (data, cpdext[n]);
|
|
|
|
pos = data->wp - dist;
|
|
if (pos < 0)
|
|
pos += WSIZE;
|
|
|
|
while (len > 0)
|
|
{
|
|
data->slide[data->wp] = data->slide[pos];
|
|
grub_png_output_byte (data, data->slide[data->wp]);
|
|
|
|
data->wp++;
|
|
if (data->wp >= WSIZE)
|
|
data->wp = 0;
|
|
|
|
pos++;
|
|
if (pos >= WSIZE)
|
|
pos = 0;
|
|
|
|
len--;
|
|
}
|
|
}
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_png_decode_image_data (struct grub_png_data *data)
|
|
{
|
|
grub_uint8_t cmf, flg;
|
|
int final;
|
|
|
|
cmf = grub_png_get_byte (data);
|
|
flg = grub_png_get_byte (data);
|
|
|
|
if ((cmf & 0xF) != Z_DEFLATED)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
"png: only support deflate compression method");
|
|
|
|
if (flg & Z_FLAG_DICT)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
"png: dictionary not supported");
|
|
|
|
do
|
|
{
|
|
int block_type;
|
|
|
|
final = grub_png_get_bits (data, 1);
|
|
block_type = grub_png_get_bits (data, 2);
|
|
|
|
switch (block_type)
|
|
{
|
|
case INFLATE_STORED:
|
|
{
|
|
grub_uint16_t i, len;
|
|
|
|
data->bit_count = 0;
|
|
len = grub_png_get_byte (data);
|
|
len += ((grub_uint16_t) grub_png_get_byte (data)) << 8;
|
|
|
|
/* Skip NLEN field. */
|
|
grub_png_get_byte (data);
|
|
grub_png_get_byte (data);
|
|
|
|
for (i = 0; i < len; i++)
|
|
grub_png_output_byte (data, grub_png_get_byte (data));
|
|
|
|
break;
|
|
}
|
|
|
|
case INFLATE_FIXED:
|
|
grub_png_init_fixed_block (data);
|
|
grub_png_read_dynamic_block (data);
|
|
break;
|
|
|
|
case INFLATE_DYNAMIC:
|
|
grub_png_init_dynamic_block (data);
|
|
grub_png_read_dynamic_block (data);
|
|
break;
|
|
|
|
default:
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
"png: unknown block type");
|
|
}
|
|
}
|
|
while ((!final) && (grub_errno == 0));
|
|
|
|
/* Skip adler checksum. */
|
|
grub_png_get_dword (data);
|
|
|
|
/* Skip crc checksum. */
|
|
grub_png_get_dword (data);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static const grub_uint8_t png_magic[8] =
|
|
{ 0x89, 0x50, 0x4e, 0x47, 0xd, 0xa, 0x1a, 0x0a };
|
|
|
|
static void
|
|
grub_png_convert_image (struct grub_png_data *data)
|
|
{
|
|
int i;
|
|
grub_uint8_t *d1, *d2;
|
|
|
|
d1 = (*data->bitmap)->data;
|
|
d2 = data->image_data + 1;
|
|
|
|
/* Only copy the upper 8 bit. */
|
|
for (i = 0; i < (data->image_width * data->image_height * data->bpp >> 1);
|
|
i++, d1++, d2+=2)
|
|
*d1 = *d2;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_png_decode_png (struct grub_png_data *data)
|
|
{
|
|
grub_uint8_t magic[8];
|
|
|
|
if (grub_file_read (data->file, &magic[0], 8) != 8)
|
|
return grub_errno;
|
|
|
|
if (grub_memcmp (magic, png_magic, sizeof (png_magic)))
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "png: not a png file");
|
|
|
|
while (1)
|
|
{
|
|
grub_uint32_t len, type;
|
|
|
|
len = grub_png_get_dword (data);
|
|
type = grub_png_get_dword (data);
|
|
data->next_offset = data->file->offset + len + 4;
|
|
|
|
switch (type)
|
|
{
|
|
case PNG_CHUNK_IHDR:
|
|
grub_png_decode_image_header (data);
|
|
break;
|
|
|
|
case PNG_CHUNK_IDAT:
|
|
data->inside_idat = 1;
|
|
data->idat_remain = len;
|
|
data->bit_count = 0;
|
|
|
|
grub_png_decode_image_data (data);
|
|
|
|
data->inside_idat = 0;
|
|
break;
|
|
|
|
case PNG_CHUNK_IEND:
|
|
if (data->is_16bit)
|
|
grub_png_convert_image (data);
|
|
|
|
return grub_errno;
|
|
|
|
default:
|
|
grub_file_seek (data->file, data->file->offset + len + 4);
|
|
}
|
|
|
|
if (grub_errno)
|
|
break;
|
|
|
|
if (data->file->offset != data->next_offset)
|
|
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
"png: chunk size error");
|
|
}
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_video_reader_png (struct grub_video_bitmap **bitmap,
|
|
const char *filename)
|
|
{
|
|
grub_file_t file;
|
|
struct grub_png_data *data;
|
|
|
|
file = grub_buffile_open (filename, 0);
|
|
if (!file)
|
|
return grub_errno;
|
|
|
|
data = grub_zalloc (sizeof (*data));
|
|
if (data != NULL)
|
|
{
|
|
data->file = file;
|
|
data->bitmap = bitmap;
|
|
|
|
grub_png_decode_png (data);
|
|
|
|
grub_free (data->image_data);
|
|
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(PNG_DEBUG)
|
|
static grub_err_t
|
|
grub_cmd_pngtest (grub_command_t cmd __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_png (&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 png_reader = {
|
|
.extension = ".png",
|
|
.reader = grub_video_reader_png,
|
|
.next = 0
|
|
};
|
|
|
|
GRUB_MOD_INIT (png)
|
|
{
|
|
grub_video_bitmap_reader_register (&png_reader);
|
|
#if defined(PNG_DEBUG)
|
|
cmd = grub_register_command ("pngtest", grub_cmd_pngtest,
|
|
"FILE",
|
|
"Tests loading of PNG bitmap.");
|
|
#endif
|
|
}
|
|
|
|
GRUB_MOD_FINI (png)
|
|
{
|
|
#if defined(PNG_DEBUG)
|
|
grub_unregister_command (cmd);
|
|
#endif
|
|
grub_video_bitmap_reader_unregister (&png_reader);
|
|
}
|