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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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#include <types.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <errno.h>
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#include "ppm.h"
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#include "ppm.h"
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static void skip_whitespace(unsigned char **data)
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static void skip_whitespace(unsigned char **data)
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{
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{
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retry:
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retry:
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    while (**data == ' ' || **data == '\t' || **data == '\n' || **data == '\r')
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    while (**data == ' ' || **data == '\t' || **data == '\n' ||
- 
 
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        **data == '\r')
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        (*data)++;
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        (*data)++;
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    if (**data == '#') {
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    if (**data == '#') {
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        while (1) {
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        while (1) {
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            if (**data == '\n' || **data == '\r')
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            if (**data == '\n' || **data == '\r')
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                break;
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                break;
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        *num += **data - '0';
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        *num += **data - '0';
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        (*data)++;
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        (*data)++;
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    }
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    }
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}
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}
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int ppm_get_data(unsigned char *data, size_t dtsz, unsigned int *width, unsigned int *height)
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int ppm_get_data(unsigned char *data, size_t dtsz, unsigned int *width,
- 
 
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    unsigned int *height)
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{
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{
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    /* Read magic */
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    /* Read magic */
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    if (data[0] != 'P' || data[1] != '6')
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    if (data[0] != 'P' || data[1] != '6')
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        return EINVAL;
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        return EINVAL;
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 * @param sy Coordinate of upper left corner
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 * @param sy Coordinate of upper left corner
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 * @param maxwidth Maximum allowed width for picture
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 * @param maxwidth Maximum allowed width for picture
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 * @param maxheight Maximum allowed height for picture
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 * @param maxheight Maximum allowed height for picture
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 * @param putpixel Putpixel function used to print bitmap
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 * @param putpixel Putpixel function used to print bitmap
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 */
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 */
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int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx,
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int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx,
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         unsigned int sy,
 - 
 
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         unsigned int maxwidth, unsigned int maxheight,
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    unsigned int sy, unsigned int maxwidth, unsigned int maxheight,
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         putpixel_cb_t putpixel, void *vport)
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    putpixel_cb_t putpixel, void *vport)
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{
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{
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    unsigned int width, height;
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    unsigned int width, height;
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    unsigned int maxcolor;
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    unsigned int maxcolor;
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    int i;
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    int i;
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    unsigned int color;
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    unsigned int color;
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    read_num(&data,&height);
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    read_num(&data,&height);
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    skip_whitespace(&data);
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    skip_whitespace(&data);
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    read_num(&data,&maxcolor);
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    read_num(&data,&maxcolor);
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    data++;
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    data++;
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    if (maxcolor == 0 || maxcolor > 255 || width*height > datasz) {
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    if (maxcolor == 0 || maxcolor > 255 || width * height > datasz) {
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        return EINVAL;
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        return EINVAL;
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    }
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    }
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    coef = 255/maxcolor;
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    coef = 255 / maxcolor;
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    if (coef*maxcolor > 255)
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    if (coef * maxcolor > 255)
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        coef -= 1;
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        coef -= 1;
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    for (i=0; i < width*height; i++) {
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    for (i = 0; i < width * height; i++) {
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        /* Crop picture if we don't fit into region */
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        /* Crop picture if we don't fit into region */
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        if (i % width > maxwidth || i/width > maxheight) {
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        if (i % width > maxwidth || i / width > maxheight) {
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            data += 3;
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            data += 3;
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            continue;
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            continue;
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        }
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        }
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        color = ((data[0]*coef) << 16) + ((data[1]*coef) << 8) + data[2]*coef;
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        color = ((data[0] * coef) << 16) + ((data[1] * coef) << 8) +
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            data[2] * coef;
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        (*putpixel)(vport, sx+(i % width), sy+(i / width), color);
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        (*putpixel)(vport, sx + (i % width), sy + (i / width), color);
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        data += 3;
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        data += 3;
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    }
 127 
    }
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 128 
 
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    return 0;
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    return 0;
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}
 130 
}