The Tor Browser: media/libpng/pngget.c@97036ab72558 (annotated)

media/libpng/pngget.c@97036ab72558 (annotated)

media/libpng/pngget.c

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* pngget.c - retrieval of values from info struct
  *
  * Last changed in libpng 1.6.1 [March 28, 2013]
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
  *
  */
 #include "pngpriv.h"
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_uint_32 flag)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->valid & flag);
    return(0);
 }
 png_size_t PNGAPI
 png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->rowbytes);
    return(0);
 }
 #ifdef PNG_INFO_IMAGE_SUPPORTED
 png_bytepp PNGAPI
 png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->row_pointers);
    return(0);
 }
 #endif
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Easy access to info, added in libpng-0.99 */
 png_uint_32 PNGAPI
 png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->width;
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->height;
    return (0);
 }
 png_byte PNGAPI
 png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->bit_depth;
    return (0);
 }
 png_byte PNGAPI
 png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->color_type;
    return (0);
 }
 png_byte PNGAPI
 png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->filter_type;
    return (0);
 }
 png_byte PNGAPI
 png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->interlace_type;
    return (0);
 }
 png_byte PNGAPI
 png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return info_ptr->compression_type;
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
    info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
       {
          png_debug1(1, "in %s retrieval function",
              "png_get_x_pixels_per_meter");
          if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
             return (info_ptr->x_pixels_per_unit);
       }
 #endif
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
     info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function",
           "png_get_y_pixels_per_meter");
       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
          return (info_ptr->y_pixels_per_unit);
    }
 #endif
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
           info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
          return (info_ptr->x_pixels_per_unit);
    }
 #endif
    return (0);
 }
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
 png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
    info_ptr)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit != 0)
          return ((float)((float)info_ptr->y_pixels_per_unit
              /(float)info_ptr->x_pixels_per_unit));
    }
 #else
    PNG_UNUSED(png_ptr)
    PNG_UNUSED(info_ptr)
 #endif
    return ((float)0.0);
 }
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
 png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
     png_const_inforp info_ptr)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
        && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0
        && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX
        && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
    {
       png_fixed_point res;
       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
       /* The following casts work because a PNG 4 byte integer only has a valid
        * range of 0..2^31-1; otherwise the cast might overflow.
        */
       if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
           (png_int_32)info_ptr->x_pixels_per_unit))
          return res;
    }
 #else
    PNG_UNUSED(png_ptr)
    PNG_UNUSED(info_ptr)
 #endif
    return 0;
 }
 #endif
 png_int_32 PNGAPI
 png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
          return (info_ptr->x_offset);
    }
 #endif
    return (0);
 }
 png_int_32 PNGAPI
 png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
          return (info_ptr->y_offset);
    }
 #endif
    return (0);
 }
 png_int_32 PNGAPI
 png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
          return (info_ptr->x_offset);
    }
 #endif
    return (0);
 }
 png_int_32 PNGAPI
 png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
    {
       png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
          return (info_ptr->y_offset);
    }
 #endif
    return (0);
 }
 #ifdef PNG_INCH_CONVERSIONS_SUPPORTED
 static png_uint_32
 ppi_from_ppm(png_uint_32 ppm)
 {
 #if 0
    /* The conversion is *(2.54/100), in binary (32 digits):
     * .00000110100000001001110101001001
     */
    png_uint_32 t1001, t1101;
    ppm >>= 1;                  /* .1 */
    t1001 = ppm + (ppm >> 3);   /* .1001 */
    t1101 = t1001 + (ppm >> 1); /* .1101 */
    ppm >>= 20;                 /* .000000000000000000001 */
    t1101 += t1101 >> 15;       /* .1101000000000001101 */
    t1001 >>= 11;               /* .000000000001001 */
    t1001 += t1001 >> 12;       /* .000000000001001000000001001 */
    ppm += t1001;               /* .000000000001001000001001001 */
    ppm += t1101;               /* .110100000001001110101001001 */
    return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
 #else
    /* The argument is a PNG unsigned integer, so it is not permitted
     * to be bigger than 2^31.
     */
    png_fixed_point result;
    if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
 ))
       return result;
    /* Overflow. */
    return 0;
 #endif
 }
 png_uint_32 PNGAPI
 png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 }
 png_uint_32 PNGAPI
 png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
 }
 png_uint_32 PNGAPI
 png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
 }
 #ifdef PNG_FIXED_POINT_SUPPORTED
 static png_fixed_point
 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
 {
    /* Convert from metres * 1,000,000 to inches * 100,000, meters to
     * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
     * Notice that this can overflow - a warning is output and 0 is
     * returned.
     */
    return png_muldiv_warn(png_ptr, microns, 500, 127);
 }
 png_fixed_point PNGAPI
 png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
     png_const_inforp info_ptr)
 {
    return png_fixed_inches_from_microns(png_ptr,
        png_get_x_offset_microns(png_ptr, info_ptr));
 }
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
 png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
     png_const_inforp info_ptr)
 {
    return png_fixed_inches_from_microns(png_ptr,
        png_get_y_offset_microns(png_ptr, info_ptr));
 }
 #endif
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
 png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    /* To avoid the overflow do the conversion directly in floating
     * point.
     */
    return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
 }
 #endif
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
 png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    /* To avoid the overflow do the conversion directly in floating
     * point.
     */
    return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
 }
 #endif
 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
 png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function", "pHYs");
       if (res_x != NULL)
       {
          *res_x = info_ptr->x_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
       if (res_y != NULL)
       {
          *res_y = info_ptr->y_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
       if (unit_type != NULL)
       {
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
          if (*unit_type == 1)
          {
             if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
             if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
          }
       }
    }
    return (retval);
 }
 #endif /* PNG_pHYs_SUPPORTED */
 #endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */
 /* png_get_channels really belongs in here, too, but it's been around longer */
 #endif  /* PNG_EASY_ACCESS_SUPPORTED */
 png_byte PNGAPI
 png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->channels);
    return (0);
 }
 #ifdef PNG_READ_SUPPORTED
 png_const_bytep PNGAPI
 png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->signature);
    return (NULL);
 }
 #endif
 #ifdef PNG_bKGD_SUPPORTED
 png_uint_32 PNGAPI
 png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
    png_color_16p *background)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
        && background != NULL)
    {
       png_debug1(1, "in %s retrieval function", "bKGD");
       *background = &(info_ptr->background);
       return (PNG_INFO_bKGD);
    }
    return (0);
 }
 #endif
 #ifdef PNG_cHRM_SUPPORTED
 /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
  * same time to correct the rgb grayscale coefficient defaults obtained from the
  * cHRM chunk in 1.5.4
  */
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
     double *white_x, double *white_y, double *red_x, double *red_y,
     double *green_x, double *green_y, double *blue_x, double *blue_y)
 {
    /* Quiet API change: this code used to only return the end points if a cHRM
     * chunk was present, but the end points can also come from iCCP or sRGB
     * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
     * the png_set_ APIs merely check that set end points are mutually
     * consistent.
     */
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
    {
       png_debug1(1, "in %s retrieval function", "cHRM");
       if (white_x != NULL)
          *white_x = png_float(png_ptr,
             info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
       if (white_y != NULL)
          *white_y = png_float(png_ptr,
             info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
       if (red_x != NULL)
          *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
             "cHRM red X");
       if (red_y != NULL)
          *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
             "cHRM red Y");
       if (green_x != NULL)
          *green_x = png_float(png_ptr,
             info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
       if (green_y != NULL)
          *green_y = png_float(png_ptr,
             info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
       if (blue_x != NULL)
          *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
             "cHRM blue X");
       if (blue_y != NULL)
          *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
             "cHRM blue Y");
       return (PNG_INFO_cHRM);
    }
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
    double *red_X, double *red_Y, double *red_Z, double *green_X,
    double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
    double *blue_Z)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
    {
       png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
       if (red_X != NULL)
          *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
             "cHRM red X");
       if (red_Y != NULL)
          *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
             "cHRM red Y");
       if (red_Z != NULL)
          *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
             "cHRM red Z");
       if (green_X != NULL)
          *green_X = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
       if (green_Y != NULL)
          *green_Y = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
       if (green_Z != NULL)
          *green_Z = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
       if (blue_X != NULL)
          *blue_X = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
       if (blue_Y != NULL)
          *blue_Y = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
       if (blue_Z != NULL)
          *blue_Z = png_float(png_ptr,
             info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
       return (PNG_INFO_cHRM);
    }
    return (0);
 }
 #  endif
 #  ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
     png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
     png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
     png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
     png_fixed_point *int_blue_Z)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
    {
       png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
       if (int_red_X != NULL)
          *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
       if (int_red_Y != NULL)
          *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
       if (int_red_Z != NULL)
          *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
       if (int_green_X != NULL)
          *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
       if (int_green_Y != NULL)
          *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
       if (int_green_Z != NULL)
          *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
       if (int_blue_X != NULL)
          *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
       if (int_blue_Y != NULL)
          *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
       if (int_blue_Z != NULL)
          *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
       return (PNG_INFO_cHRM);
    }
    return (0);
 }
 png_uint_32 PNGAPI
 png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
     png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
     png_fixed_point *blue_x, png_fixed_point *blue_y)
 {
    png_debug1(1, "in %s retrieval function", "cHRM");
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
    {
       if (white_x != NULL)
          *white_x = info_ptr->colorspace.end_points_xy.whitex;
       if (white_y != NULL)
          *white_y = info_ptr->colorspace.end_points_xy.whitey;
       if (red_x != NULL)
          *red_x = info_ptr->colorspace.end_points_xy.redx;
       if (red_y != NULL)
          *red_y = info_ptr->colorspace.end_points_xy.redy;
       if (green_x != NULL)
          *green_x = info_ptr->colorspace.end_points_xy.greenx;
       if (green_y != NULL)
          *green_y = info_ptr->colorspace.end_points_xy.greeny;
       if (blue_x != NULL)
          *blue_x = info_ptr->colorspace.end_points_xy.bluex;
       if (blue_y != NULL)
          *blue_y = info_ptr->colorspace.end_points_xy.bluey;
       return (PNG_INFO_cHRM);
    }
    return (0);
 }
 #  endif
 #endif
 #ifdef PNG_gAMA_SUPPORTED
 #  ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_fixed_point *file_gamma)
 {
    png_debug1(1, "in %s retrieval function", "gAMA");
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) &&
       file_gamma != NULL)
    {
       *file_gamma = info_ptr->colorspace.gamma;
       return (PNG_INFO_gAMA);
    }
    return (0);
 }
 #  endif
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
     double *file_gamma)
 {
    png_debug1(1, "in %s retrieval function", "gAMA(float)");
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) &&
       file_gamma != NULL)
    {
       *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
          "png_get_gAMA");
       return (PNG_INFO_gAMA);
    }
    return (0);
 }
 #  endif
 #endif
 #ifdef PNG_sRGB_SUPPORTED
 png_uint_32 PNGAPI
 png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
     int *file_srgb_intent)
 {
    png_debug1(1, "in %s retrieval function", "sRGB");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
        && file_srgb_intent != NULL)
    {
       *file_srgb_intent = info_ptr->colorspace.rendering_intent;
       return (PNG_INFO_sRGB);
    }
    return (0);
 }
 #endif
 #ifdef PNG_iCCP_SUPPORTED
 png_uint_32 PNGAPI
 png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
     png_charpp name, int *compression_type,
     png_bytepp profile, png_uint_32 *proflen)
 {
    png_debug1(1, "in %s retrieval function", "iCCP");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
        && name != NULL && compression_type != NULL && profile != NULL &&
 		 proflen != NULL)
    {
       *name = info_ptr->iccp_name;
       *profile = info_ptr->iccp_profile;
       *proflen = png_get_uint_32(info_ptr->iccp_profile);
       /* This is somewhat irrelevant since the profile data returned has
        * actually been uncompressed.
        */
       *compression_type = PNG_COMPRESSION_TYPE_BASE;
       return (PNG_INFO_iCCP);
    }
    return (0);
 }
 #endif
 #ifdef PNG_sPLT_SUPPORTED
 int PNGAPI
 png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
     png_sPLT_tpp spalettes)
 {
    if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
    {
       *spalettes = info_ptr->splt_palettes;
       return info_ptr->splt_palettes_num;
    }
    return (0);
 }
 #endif
 #ifdef PNG_hIST_SUPPORTED
 png_uint_32 PNGAPI
 png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
     png_uint_16p *hist)
 {
    png_debug1(1, "in %s retrieval function", "hIST");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
        && hist != NULL)
    {
       *hist = info_ptr->hist;
       return (PNG_INFO_hIST);
    }
    return (0);
 }
 #endif
 png_uint_32 PNGAPI
 png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_uint_32 *width, png_uint_32 *height, int *bit_depth,
     int *color_type, int *interlace_type, int *compression_type,
     int *filter_type)
 {
    png_debug1(1, "in %s retrieval function", "IHDR");
    if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
        height == NULL || bit_depth == NULL || color_type == NULL)
       return (0);
    *width = info_ptr->width;
    *height = info_ptr->height;
    *bit_depth = info_ptr->bit_depth;
    *color_type = info_ptr->color_type;
    if (compression_type != NULL)
       *compression_type = info_ptr->compression_type;
    if (filter_type != NULL)
       *filter_type = info_ptr->filter_type;
    if (interlace_type != NULL)
       *interlace_type = info_ptr->interlace_type;
    /* This is redundant if we can be sure that the info_ptr values were all
     * assigned in png_set_IHDR().  We do the check anyhow in case an
     * application has ignored our advice not to mess with the members
     * of info_ptr directly.
     */
    png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
        info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
        info_ptr->compression_type, info_ptr->filter_type);
    return (1);
 }
 #ifdef PNG_oFFs_SUPPORTED
 png_uint_32 PNGAPI
 png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 {
    png_debug1(1, "in %s retrieval function", "oFFs");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
        && offset_x != NULL && offset_y != NULL && unit_type != NULL)
    {
       *offset_x = info_ptr->x_offset;
       *offset_y = info_ptr->y_offset;
       *unit_type = (int)info_ptr->offset_unit_type;
       return (PNG_INFO_oFFs);
    }
    return (0);
 }
 #endif
 #ifdef PNG_pCAL_SUPPORTED
 png_uint_32 PNGAPI
 png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
     png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
     png_charp *units, png_charpp *params)
 {
    png_debug1(1, "in %s retrieval function", "pCAL");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
        && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
        nparams != NULL && units != NULL && params != NULL)
    {
       *purpose = info_ptr->pcal_purpose;
       *X0 = info_ptr->pcal_X0;
       *X1 = info_ptr->pcal_X1;
       *type = (int)info_ptr->pcal_type;
       *nparams = (int)info_ptr->pcal_nparams;
       *units = info_ptr->pcal_units;
       *params = info_ptr->pcal_params;
       return (PNG_INFO_pCAL);
    }
    return (0);
 }
 #endif
 #ifdef PNG_sCAL_SUPPORTED
 #  ifdef PNG_FIXED_POINT_SUPPORTED
 #    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
          defined(PNG_FLOATING_POINT_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
     int *unit, png_fixed_point *width, png_fixed_point *height)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
        (info_ptr->valid & PNG_INFO_sCAL))
    {
       *unit = info_ptr->scal_unit;
       /*TODO: make this work without FP support; the API is currently eliminated
        * if neither floating point APIs nor internal floating point arithmetic
        * are enabled.
        */
       *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
       *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
          "sCAL height");
       return (PNG_INFO_sCAL);
    }
    return(0);
 }
 #    endif /* FLOATING_ARITHMETIC */
 #  endif /* FIXED_POINT */
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
     int *unit, double *width, double *height)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
        (info_ptr->valid & PNG_INFO_sCAL))
    {
       *unit = info_ptr->scal_unit;
       *width = atof(info_ptr->scal_s_width);
       *height = atof(info_ptr->scal_s_height);
       return (PNG_INFO_sCAL);
    }
    return(0);
 }
 #  endif /* FLOATING POINT */
 png_uint_32 PNGAPI
 png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
     int *unit, png_charpp width, png_charpp height)
 {
    if (png_ptr != NULL && info_ptr != NULL &&
        (info_ptr->valid & PNG_INFO_sCAL))
    {
       *unit = info_ptr->scal_unit;
       *width = info_ptr->scal_s_width;
       *height = info_ptr->scal_s_height;
       return (PNG_INFO_sCAL);
    }
    return(0);
 }
 #endif /* sCAL */
 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
 png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
    png_debug1(1, "in %s retrieval function", "pHYs");
    if (png_ptr != NULL && info_ptr != NULL &&
        (info_ptr->valid & PNG_INFO_pHYs))
    {
       if (res_x != NULL)
       {
          *res_x = info_ptr->x_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
       if (res_y != NULL)
       {
          *res_y = info_ptr->y_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
       if (unit_type != NULL)
       {
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
       }
    }
    return (retval);
 }
 #endif /* pHYs */
 png_uint_32 PNGAPI
 png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
     png_colorp *palette, int *num_palette)
 {
    png_debug1(1, "in %s retrieval function", "PLTE");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
        && palette != NULL)
    {
       *palette = info_ptr->palette;
       *num_palette = info_ptr->num_palette;
       png_debug1(3, "num_palette = %d", *num_palette);
       return (PNG_INFO_PLTE);
    }
    return (0);
 }
 #ifdef PNG_sBIT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
     png_color_8p *sig_bit)
 {
    png_debug1(1, "in %s retrieval function", "sBIT");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
        && sig_bit != NULL)
    {
       *sig_bit = &(info_ptr->sig_bit);
       return (PNG_INFO_sBIT);
    }
    return (0);
 }
 #endif
 #ifdef PNG_TEXT_SUPPORTED
 int PNGAPI
 png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
     png_textp *text_ptr, int *num_text)
 {
    if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
    {
       png_debug1(1, "in 0x%lx retrieval function",
          (unsigned long)png_ptr->chunk_name);
       if (text_ptr != NULL)
          *text_ptr = info_ptr->text;
       if (num_text != NULL)
          *num_text = info_ptr->num_text;
       return info_ptr->num_text;
    }
    if (num_text != NULL)
       *num_text = 0;
    return(0);
 }
 #endif
 #ifdef PNG_tIME_SUPPORTED
 png_uint_32 PNGAPI
 png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
     png_timep *mod_time)
 {
    png_debug1(1, "in %s retrieval function", "tIME");
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
        && mod_time != NULL)
    {
       *mod_time = &(info_ptr->mod_time);
       return (PNG_INFO_tIME);
    }
    return (0);
 }
 #endif
 #ifdef PNG_tRNS_SUPPORTED
 png_uint_32 PNGAPI
 png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
     png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
 {
    png_uint_32 retval = 0;
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
    {
       png_debug1(1, "in %s retrieval function", "tRNS");
       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       {
          if (trans_alpha != NULL)
          {
             *trans_alpha = info_ptr->trans_alpha;
             retval |= PNG_INFO_tRNS;
          }
          if (trans_color != NULL)
             *trans_color = &(info_ptr->trans_color);
       }
       else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
       {
          if (trans_color != NULL)
          {
             *trans_color = &(info_ptr->trans_color);
             retval |= PNG_INFO_tRNS;
          }
          if (trans_alpha != NULL)
             *trans_alpha = NULL;
       }
       if (num_trans != NULL)
       {
          *num_trans = info_ptr->num_trans;
          retval |= PNG_INFO_tRNS;
       }
    }
    return (retval);
 }
 #endif
 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
 int PNGAPI
 png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
     png_unknown_chunkpp unknowns)
 {
    if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
    {
       *unknowns = info_ptr->unknown_chunks;
       return info_ptr->unknown_chunks_num;
    }
    return (0);
 }
 #endif
 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 png_byte PNGAPI
 png_get_rgb_to_gray_status (png_const_structrp png_ptr)
 {
    return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
 }
 #endif
 #ifdef PNG_USER_CHUNKS_SUPPORTED
 png_voidp PNGAPI
 png_get_user_chunk_ptr(png_const_structrp png_ptr)
 {
    return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
 }
 #endif
 png_size_t PNGAPI
 png_get_compression_buffer_size(png_const_structrp png_ptr)
 {
    if (png_ptr == NULL)
       return 0;
 #  ifdef PNG_WRITE_SUPPORTED
       if (png_ptr->mode & PNG_IS_READ_STRUCT)
 #  endif
    {
 #     ifdef PNG_SEQUENTIAL_READ_SUPPORTED
          return png_ptr->IDAT_read_size;
 #     else
          return PNG_IDAT_READ_SIZE;
 #     endif
    }
 #  ifdef PNG_WRITE_SUPPORTED
       else
          return png_ptr->zbuffer_size;
 #  endif
 }
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 /* These functions were added to libpng 1.2.6 and were enabled
  * by default in libpng-1.4.0 */
 png_uint_32 PNGAPI
 png_get_user_width_max (png_const_structrp png_ptr)
 {
    return (png_ptr ? png_ptr->user_width_max : 0);
 }
 png_uint_32 PNGAPI
 png_get_user_height_max (png_const_structrp png_ptr)
 {
    return (png_ptr ? png_ptr->user_height_max : 0);
 }
 /* This function was added to libpng 1.4.0 */
 png_uint_32 PNGAPI
 png_get_chunk_cache_max (png_const_structrp png_ptr)
 {
    return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
 }
 /* This function was added to libpng 1.4.1 */
 png_alloc_size_t PNGAPI
 png_get_chunk_malloc_max (png_const_structrp png_ptr)
 {
    return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
 /* These functions were added to libpng 1.4.0 */
 #ifdef PNG_IO_STATE_SUPPORTED
 png_uint_32 PNGAPI
 png_get_io_state (png_const_structrp png_ptr)
 {
    return png_ptr->io_state;
 }
 png_uint_32 PNGAPI
 png_get_io_chunk_type (png_const_structrp png_ptr)
 {
    return png_ptr->chunk_name;
 }
 #endif /* ?PNG_IO_STATE_SUPPORTED */
 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
 #  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
 int PNGAPI
 png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return png_ptr->num_palette_max;
    return (-1);
 }
 #  endif
 #endif
 #ifdef PNG_APNG_SUPPORTED
 png_uint_32 PNGAPI
 png_get_acTL(png_structp png_ptr, png_infop info_ptr,
              png_uint_32 *num_frames, png_uint_32 *num_plays)
 {
     png_debug1(1, "in %s retrieval function", "acTL");
     if (png_ptr != NULL && info_ptr != NULL &&
         (info_ptr->valid & PNG_INFO_acTL) &&
         num_frames != NULL && num_plays != NULL)
     {
         *num_frames = info_ptr->num_frames;
         *num_plays = info_ptr->num_plays;
         return (1);
     }
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_num_frames(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_num_frames()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->num_frames);
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_num_plays(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_num_plays()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->num_plays);
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_next_frame_fcTL(png_structp png_ptr, png_infop info_ptr,
              png_uint_32 *width, png_uint_32 *height,
              png_uint_32 *x_offset, png_uint_32 *y_offset,
              png_uint_16 *delay_num, png_uint_16 *delay_den,
              png_byte *dispose_op, png_byte *blend_op)
 {
     png_debug1(1, "in %s retrieval function", "fcTL");
     if (png_ptr != NULL && info_ptr != NULL &&
         (info_ptr->valid & PNG_INFO_fcTL) &&
         width != NULL && height != NULL &&
         x_offset != NULL && y_offset != NULL &&
         delay_num != NULL && delay_den != NULL &&
         dispose_op != NULL && blend_op != NULL)
     {
         *width = info_ptr->next_frame_width;
         *height = info_ptr->next_frame_height;
         *x_offset = info_ptr->next_frame_x_offset;
         *y_offset = info_ptr->next_frame_y_offset;
         *delay_num = info_ptr->next_frame_delay_num;
         *delay_den = info_ptr->next_frame_delay_den;
         *dispose_op = info_ptr->next_frame_dispose_op;
         *blend_op = info_ptr->next_frame_blend_op;
         return (1);
     }
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_next_frame_width(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_width()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_width);
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_next_frame_height(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_height()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_height);
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_next_frame_x_offset(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_x_offset()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_x_offset);
     return (0);
 }
 png_uint_32 PNGAPI
 png_get_next_frame_y_offset(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_y_offset()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_y_offset);
     return (0);
 }
 png_uint_16 PNGAPI
 png_get_next_frame_delay_num(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_delay_num()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_delay_num);
     return (0);
 }
 png_uint_16 PNGAPI
 png_get_next_frame_delay_den(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_delay_den()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_delay_den);
     return (0);
 }
 png_byte PNGAPI
 png_get_next_frame_dispose_op(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_dispose_op()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_dispose_op);
     return (0);
 }
 png_byte PNGAPI
 png_get_next_frame_blend_op(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_get_next_frame_blend_op()");
     if (png_ptr != NULL && info_ptr != NULL)
         return (info_ptr->next_frame_blend_op);
     return (0);
 }
 png_byte PNGAPI
 png_get_first_frame_is_hidden(png_structp png_ptr, png_infop info_ptr)
 {
     png_debug(1, "in png_first_frame_is_hidden()");
     if (png_ptr != NULL)
        return (png_byte)(png_ptr->apng_flags & PNG_FIRST_FRAME_HIDDEN);
     PNG_UNUSED(info_ptr)
     return 0;
 }
 #endif /* PNG_APNG_SUPPORTED */
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

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media/libpng/pngget.c@97036ab72558 (annotated)

media/libpng/pngget.c