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grub/grub-core/video/readers/tga.c
Vladimir Serbinenko ca0a4f689a verifiers: File type for fine-grained signature-verification controlling 
Let's provide file type info to the I/O layer. This way verifiers
framework and its users will be able to differentiate files and verify
only required ones.

This is preparatory patch.

Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
2018-11-09 13:25:31 +01:00

511 lines
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/bitmap.h>
#include <grub/types.h>
#include <grub/normal.h>
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/bufio.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* Uncomment following define to enable TGA debug. */
//#define TGA_DEBUG
#define dump_int_field(x) grub_dprintf ("tga", #x " = %d (0x%04x)\n", x, x);
#if defined(TGA_DEBUG)
static grub_command_t cmd;
#endif
enum
{
GRUB_TGA_IMAGE_TYPE_NONE = 0,
GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR = 1,
GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR = 2,
GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE = 3,
GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR = 9,
GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR = 10,
GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE = 11,
};
enum
{
GRUB_TGA_COLOR_MAP_TYPE_NONE = 0,
GRUB_TGA_COLOR_MAP_TYPE_INCLUDED = 1
};
enum
{
GRUB_TGA_IMAGE_ORIGIN_RIGHT = 0x10,
GRUB_TGA_IMAGE_ORIGIN_TOP = 0x20
};
struct grub_tga_header
{
grub_uint8_t id_length;
grub_uint8_t color_map_type;
grub_uint8_t image_type;
/* Color Map Specification. */
grub_uint16_t color_map_first_index;
grub_uint16_t color_map_length;
grub_uint8_t color_map_bpp;
/* Image Specification. */
grub_uint16_t image_x_origin;
grub_uint16_t image_y_origin;
grub_uint16_t image_width;
grub_uint16_t image_height;
grub_uint8_t image_bpp;
grub_uint8_t image_descriptor;
} GRUB_PACKED;
struct tga_data
{
struct grub_tga_header hdr;
int uses_rle;
int pktlen;
int bpp;
int is_rle;
grub_uint8_t pixel[4];
grub_uint8_t palette[256][3];
struct grub_video_bitmap *bitmap;
grub_file_t file;
unsigned image_width;
unsigned image_height;
};
static grub_err_t
fetch_pixel (struct tga_data *data)
{
if (!data->uses_rle)
{
if (grub_file_read (data->file, &data->pixel[0], data->bpp)
!= data->bpp)
return grub_errno;
return GRUB_ERR_NONE;
}
if (!data->pktlen)
{
grub_uint8_t type;
if (grub_file_read (data->file, &type, sizeof (type)) != sizeof(type))
return grub_errno;
data->is_rle = !!(type & 0x80);
data->pktlen = (type & 0x7f) + 1;
if (data->is_rle && grub_file_read (data->file, &data->pixel[0], data->bpp)
!= data->bpp)
return grub_errno;
}
if (!data->is_rle && grub_file_read (data->file, &data->pixel[0], data->bpp)
!= data->bpp)
return grub_errno;
data->pktlen--;
return GRUB_ERR_NONE;
}
static grub_err_t
tga_load_palette (struct tga_data *data)
{
grub_size_t len = grub_le_to_cpu32 (data->hdr.color_map_length) * 3;
if (len > sizeof (data->palette))
len = sizeof (data->palette);
if (grub_file_read (data->file, &data->palette, len)
!= (grub_ssize_t) len)
return grub_errno;
#ifndef GRUB_CPU_WORDS_BIGENDIAN
{
grub_size_t i;
for (i = 0; 3 * i < len; i++)
{
grub_uint8_t t;
t = data->palette[i][0];
data->palette[i][0] = data->palette[i][2];
data->palette[i][2] = t;
}
}
#endif
return GRUB_ERR_NONE;
}
static grub_err_t
tga_load_index_color (struct tga_data *data)
{
unsigned int x;
unsigned int y;
grub_uint8_t *ptr;
for (y = 0; y < data->image_height; y++)
{
ptr = data->bitmap->data;
if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
ptr += y * data->bitmap->mode_info.pitch;
else
ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
for (x = 0; x < data->image_width; x++)
{
grub_err_t err;
err = fetch_pixel (data);
if (err)
return err;
ptr[0] = data->palette[data->pixel[0]][0];
ptr[1] = data->palette[data->pixel[0]][1];
ptr[2] = data->palette[data->pixel[0]][2];
ptr += 3;
}
}
return GRUB_ERR_NONE;
}
static grub_err_t
tga_load_grayscale (struct tga_data *data)
{
unsigned int x;
unsigned int y;
grub_uint8_t *ptr;
for (y = 0; y < data->image_height; y++)
{
ptr = data->bitmap->data;
if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
ptr += y * data->bitmap->mode_info.pitch;
else
ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
for (x = 0; x < data->image_width; x++)
{
grub_err_t err;
err = fetch_pixel (data);
if (err)
return err;
ptr[0] = data->pixel[0];
ptr[1] = data->pixel[0];
ptr[2] = data->pixel[0];
ptr += 3;
}
}
return GRUB_ERR_NONE;
}
static grub_err_t
tga_load_truecolor_R8G8B8 (struct tga_data *data)
{
unsigned int x;
unsigned int y;
grub_uint8_t *ptr;
for (y = 0; y < data->image_height; y++)
{
ptr = data->bitmap->data;
if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
ptr += y * data->bitmap->mode_info.pitch;
else
ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
for (x = 0; x < data->image_width; x++)
{
grub_err_t err;
err = fetch_pixel (data);
if (err)
return err;
#ifdef GRUB_CPU_WORDS_BIGENDIAN
ptr[0] = data->pixel[0];
ptr[1] = data->pixel[1];
ptr[2] = data->pixel[2];
#else
ptr[0] = data->pixel[2];
ptr[1] = data->pixel[1];
ptr[2] = data->pixel[0];
#endif
ptr += 3;
}
}
return GRUB_ERR_NONE;
}
static grub_err_t
tga_load_truecolor_R8G8B8A8 (struct tga_data *data)
{
unsigned int x;
unsigned int y;
grub_uint8_t *ptr;
for (y = 0; y < data->image_height; y++)
{
ptr = data->bitmap->data;
if ((data->hdr.image_descriptor & GRUB_TGA_IMAGE_ORIGIN_TOP) != 0)
ptr += y * data->bitmap->mode_info.pitch;
else
ptr += (data->image_height - 1 - y) * data->bitmap->mode_info.pitch;
for (x = 0; x < data->image_width; x++)
{
grub_err_t err;
err = fetch_pixel (data);
if (err)
return err;
#ifdef GRUB_CPU_WORDS_BIGENDIAN
ptr[0] = data->pixel[0];
ptr[1] = data->pixel[1];
ptr[2] = data->pixel[2];
ptr[3] = data->pixel[3];
#else
ptr[0] = data->pixel[2];
ptr[1] = data->pixel[1];
ptr[2] = data->pixel[0];
ptr[3] = data->pixel[3];
#endif
ptr += 4;
}
}
return GRUB_ERR_NONE;
}
static grub_err_t
grub_video_reader_tga (struct grub_video_bitmap **bitmap,
const char *filename)
{
grub_ssize_t pos;
struct tga_data data;
grub_memset (&data, 0, sizeof (data));
data.file = grub_buffile_open (filename, GRUB_FILE_TYPE_PIXMAP, 0);
if (! data.file)
return grub_errno;
/* TGA Specification states that we SHOULD start by reading
ID from end of file, but we really don't care about that as we are
not going to support developer area & extensions at this point. */
/* Read TGA header from beginning of file. */
if (grub_file_read (data.file, &data.hdr, sizeof (data.hdr))
!= sizeof (data.hdr))
{
grub_file_close (data.file);
return grub_errno;
}
/* Skip ID field. */
pos = grub_file_tell (data.file);
pos += data.hdr.id_length;
grub_file_seek (data.file, pos);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
grub_dprintf("tga", "tga: header\n");
dump_int_field(data.hdr.id_length);
dump_int_field(data.hdr.color_map_type);
dump_int_field(data.hdr.image_type);
dump_int_field(data.hdr.color_map_first_index);
dump_int_field(data.hdr.color_map_length);
dump_int_field(data.hdr.color_map_bpp);
dump_int_field(data.hdr.image_x_origin);
dump_int_field(data.hdr.image_y_origin);
dump_int_field(data.hdr.image_width);
dump_int_field(data.hdr.image_height);
dump_int_field(data.hdr.image_bpp);
dump_int_field(data.hdr.image_descriptor);
data.image_width = grub_le_to_cpu16 (data.hdr.image_width);
data.image_height = grub_le_to_cpu16 (data.hdr.image_height);
/* Check that bitmap encoding is supported. */
switch (data.hdr.image_type)
{
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
data.uses_rle = 1;
break;
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
data.uses_rle = 0;
break;
default:
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (unknown encoding %d)", data.hdr.image_type);
}
data.bpp = data.hdr.image_bpp / 8;
/* Check that bitmap depth is supported. */
switch (data.hdr.image_type)
{
case GRUB_TGA_IMAGE_TYPE_RLE_BLACK_AND_WHITE:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_BLACK_AND_WHITE:
if (data.hdr.image_bpp != 8)
{
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_grayscale (&data);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_INDEXCOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_INDEXCOLOR:
if (data.hdr.image_bpp != 8
|| data.hdr.color_map_bpp != 24
|| data.hdr.color_map_first_index != 0)
{
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_palette (&data);
tga_load_index_color (&data);
break;
case GRUB_TGA_IMAGE_TYPE_RLE_TRUECOLOR:
case GRUB_TGA_IMAGE_TYPE_UNCOMPRESSED_TRUECOLOR:
switch (data.hdr.image_bpp)
{
case 24:
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGB_888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_truecolor_R8G8B8 (&data);
break;
case 32:
grub_video_bitmap_create (bitmap, data.image_width,
data.image_height,
GRUB_VIDEO_BLIT_FORMAT_RGBA_8888);
if (grub_errno != GRUB_ERR_NONE)
{
grub_file_close (data.file);
return grub_errno;
}
data.bitmap = *bitmap;
/* Load bitmap data. */
tga_load_truecolor_R8G8B8A8 (&data);
break;
default:
grub_file_close (data.file);
return grub_error (GRUB_ERR_BAD_FILE_TYPE,
"unsupported bitmap format (bpp=%d)",
data.hdr.image_bpp);
}
}
/* If there was a loading problem, destroy bitmap. */
if (grub_errno != GRUB_ERR_NONE)
{
grub_video_bitmap_destroy (*bitmap);
*bitmap = 0;
}
grub_file_close (data.file);
return grub_errno;
}
#if defined(TGA_DEBUG)
static grub_err_t
grub_cmd_tgatest (grub_command_t cmd_d __attribute__ ((unused)),
int argc, char **args)
{
struct grub_video_bitmap *bitmap = 0;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
grub_video_reader_tga (&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 tga_reader = {
.extension = ".tga",
.reader = grub_video_reader_tga,
.next = 0
};
GRUB_MOD_INIT(tga)
{
grub_video_bitmap_reader_register (&tga_reader);
#if defined(TGA_DEBUG)
cmd = grub_register_command ("tgatest", grub_cmd_tgatest,
"FILE", "Tests loading of TGA bitmap.");
#endif
}
GRUB_MOD_FINI(tga)
{
#if defined(TGA_DEBUG)
grub_unregister_command (cmd);
#endif
grub_video_bitmap_reader_unregister (&tga_reader);
}
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