4 limits.c - manages data/functions for limiting the sizes of images read from files.
9 if (!i_set_image_file_limits(max_width, max_height, max_bytes)) {
12 i_get_image_file_limits(&max_width, &max_height, &max_bytes);
14 // file reader implementations
15 if (!i_int_check_image_file_limits(width, height, channels, sizeof(i_sample_t))) {
21 Manage limits for image files read by Imager.
23 Setting a value of zero means that limit will be ignored.
30 #define IMAGER_NO_CONTEXT
34 =item im_set_image_file_limits(ctx, width, height, bytes)
35 X<im_set_image_file_limits API>X<i_set_image_file_limits API>
37 =synopsis im_set_image_file_limits(aIMCTX, 500, 500, 1000000);
38 =synopsis i_set_image_file_limits(500, 500, 1000000);
40 Set limits on the sizes of images read by Imager.
42 Setting a limit to 0 means that limit is ignored.
44 Negative limits result in failure.
52 i_img_dim width, height - maximum width and height.
56 size_t bytes - maximum size in memory in bytes. A value of zero sets
57 this limit to one gigabyte.
61 Returns non-zero on success.
63 Also callable as C<i_set_image_file_limits(width, height, bytes)>.
69 im_set_image_file_limits(pIMCTX, i_img_dim width, i_img_dim height, size_t bytes) {
73 i_push_error(0, "width must be non-negative");
77 i_push_error(0, "height must be non-negative");
81 i_push_error(0, "bytes must be non-negative");
85 aIMCTX->max_width = width;
86 aIMCTX->max_height = height;
87 aIMCTX->max_bytes = bytes ? bytes : DEF_BYTES_LIMIT;
93 =item im_get_image_file_limits(ctx, &width, &height, &bytes)
94 X<im_get_image_file_limits API>X<i_get_image_file_limits>
96 =synopsis im_get_image_file_limits(aIMCTX, &width, &height, &bytes)
97 =synopsis i_get_image_file_limits(&width, &height, &bytes)
99 Retrieves the file limits set by i_set_image_file_limits().
105 i_img_dim *width, *height - the maximum width and height of the image.
109 size_t *bytes - size in memory of the image in bytes.
113 Also callable as C<i_get_image_file_limits(&width, &height, &bytes)>.
119 im_get_image_file_limits(pIMCTX, i_img_dim *width, i_img_dim *height, size_t *bytes) {
120 im_clear_error(aIMCTX);
122 *width = aIMCTX->max_width;
123 *height = aIMCTX->max_height;
124 *bytes = aIMCTX->max_bytes;
130 =item im_int_check_image_file_limits(width, height, channels, sample_size)
131 X<im_int_check_image_file_limits API>X<i_int_check_image_file_limits>
133 =synopsis im_int_check_image_file_limits(aIMCTX, width, height, channels, sizeof(i_sample_t))
134 =synopsis i_int_check_image_file_limits(width, height, channels, sizeof(i_sample_t))
136 Checks the size of a file in memory against the configured image file
139 This also range checks the values to those permitted by Imager and
140 checks for overflows in calculating the size.
142 Returns non-zero if the file is within limits.
144 This function is intended to be called by image file read functions.
146 Also callable as C<i_int_check_image_file_limits(width, height, channels, sizeof(i_sample_t)>.
152 im_int_check_image_file_limits(pIMCTX, i_img_dim width, i_img_dim height, int channels, size_t sample_size) {
154 im_clear_error(aIMCTX);
157 im_push_errorf(aIMCTX, 0, "file size limit - image width of %" i_DF " is not positive",
161 if (aIMCTX->max_width && width > aIMCTX->max_width) {
162 im_push_errorf(aIMCTX, 0, "file size limit - image width of %" i_DF " exceeds limit of %" i_DF,
163 i_DFc(width), i_DFc(aIMCTX->max_width));
168 im_push_errorf(aIMCTX, 0, "file size limit - image height of %" i_DF " is not positive",
173 if (aIMCTX->max_height && height > aIMCTX->max_height) {
174 im_push_errorf(aIMCTX, 0, "file size limit - image height of %" i_DF
175 " exceeds limit of %" i_DF, i_DFc(height), i_DFc(aIMCTX->max_height));
179 if (channels < 1 || channels > MAXCHANNELS) {
180 im_push_errorf(aIMCTX, 0, "file size limit - channels %d out of range",
185 if (sample_size < 1 || sample_size > sizeof(long double)) {
186 im_push_errorf(aIMCTX, 0, "file size limit - sample_size %ld out of range",
191 /* This overflow check is a bit more paranoid than usual.
192 We don't protect it under max_bytes since we always want to check
195 bytes = width * height * channels * sample_size;
196 if (bytes / width != height * channels * sample_size
197 || bytes / height != width * channels * sample_size) {
198 im_push_error(aIMCTX, 0, "file size limit - integer overflow calculating storage");
201 if (aIMCTX->max_bytes) {
202 if (bytes > aIMCTX->max_bytes) {
203 im_push_errorf(aIMCTX, 0, "file size limit - storage size of %lu "
204 "exceeds limit of %lu", (unsigned long)bytes,
205 (unsigned long)aIMCTX->max_bytes);