/*
=item i_img_setmask(C<im>, C<ch_mask>)
=category Image Information
-=synopsis // only channel 0 writeable
+=synopsis // only channel 0 writable
=synopsis i_img_setmask(img, 0x01);
Set the image channel mask for C<im> to C<ch_mask>.
i_color temp;
int ch;
- if (i_gpix(im, x, y, &temp)) {
+ if (i_gpix(im, x, y, &temp) == 0) {
for (ch = 0; ch < im->channels; ++ch)
pix->channel[ch] = Sample8ToF(temp.channel[ch]);
return 0;
}
}
-/*
-=back
-
-=head2 Stream reading and writing wrapper functions
-
-=over
-
-=item i_gen_reader(i_gen_read_data *info, char *buf, int length)
-
-Performs general read buffering for file readers that permit reading
-to be done through a callback.
-
-The final callback gets two parameters, a I<need> value, and a I<want>
-value, where I<need> is the amount of data that the file library needs
-to read, and I<want> is the amount of space available in the buffer
-maintained by these functions.
-
-This means if you need to read from a stream that you don't know the
-length of, you can return I<need> bytes, taking the performance hit of
-possibly expensive callbacks (eg. back to perl code), or if you are
-reading from a stream where it doesn't matter if some data is lost, or
-if the total length of the stream is known, you can return I<want>
-bytes.
-
-=cut
-*/
-
-int
-i_gen_reader(i_gen_read_data *gci, char *buf, int length) {
- int total;
-
- if (length < gci->length - gci->cpos) {
- /* simplest case */
- memcpy(buf, gci->buffer+gci->cpos, length);
- gci->cpos += length;
- return length;
- }
-
- total = 0;
- memcpy(buf, gci->buffer+gci->cpos, gci->length-gci->cpos);
- total += gci->length - gci->cpos;
- length -= gci->length - gci->cpos;
- buf += gci->length - gci->cpos;
- if (length < (int)sizeof(gci->buffer)) {
- int did_read;
- int copy_size;
- while (length
- && (did_read = (gci->cb)(gci->userdata, gci->buffer, length,
- sizeof(gci->buffer))) > 0) {
- gci->cpos = 0;
- gci->length = did_read;
-
- copy_size = i_min(length, gci->length);
- memcpy(buf, gci->buffer, copy_size);
- gci->cpos += copy_size;
- buf += copy_size;
- total += copy_size;
- length -= copy_size;
- }
- }
- else {
- /* just read the rest - too big for our buffer*/
- int did_read;
- while ((did_read = (gci->cb)(gci->userdata, buf, length, length)) > 0) {
- length -= did_read;
- total += did_read;
- buf += did_read;
- }
- }
- return total;
-}
-
-/*
-=item i_gen_read_data_new(i_read_callback_t cb, char *userdata)
-
-For use by callback file readers to initialize the reader buffer.
-
-Allocates, initializes and returns the reader buffer.
-
-See also L<image.c/free_gen_read_data> and L<image.c/i_gen_reader>.
-
-=cut
-*/
-i_gen_read_data *
-i_gen_read_data_new(i_read_callback_t cb, char *userdata) {
- i_gen_read_data *self = mymalloc(sizeof(i_gen_read_data));
- self->cb = cb;
- self->userdata = userdata;
- self->length = 0;
- self->cpos = 0;
-
- return self;
-}
-
-/*
-=item i_free_gen_read_data(i_gen_read_data *)
-
-Cleans up.
-
-=cut
-*/
-void i_free_gen_read_data(i_gen_read_data *self) {
- myfree(self);
-}
-
-/*
-=item i_gen_writer(i_gen_write_data *info, char const *data, int size)
-
-Performs write buffering for a callback based file writer.
-
-Failures are considered fatal, if a write fails then data will be
-dropped.
-
-=cut
-*/
-int
-i_gen_writer(
-i_gen_write_data *self,
-char const *data,
-int size)
-{
- if (self->filledto && self->filledto+size > self->maxlength) {
- if (self->cb(self->userdata, self->buffer, self->filledto)) {
- self->filledto = 0;
- }
- else {
- self->filledto = 0;
- return 0;
- }
- }
- if (self->filledto+size <= self->maxlength) {
- /* just save it */
- memcpy(self->buffer+self->filledto, data, size);
- self->filledto += size;
- return 1;
- }
- /* doesn't fit - hand it off */
- return self->cb(self->userdata, data, size);
-}
-
-/*
-=item i_gen_write_data_new(i_write_callback_t cb, char *userdata, int max_length)
-
-Allocates and initializes the data structure used by i_gen_writer.
-
-This should be released with L<image.c/i_free_gen_write_data>
-
-=cut
-*/
-i_gen_write_data *i_gen_write_data_new(i_write_callback_t cb,
- char *userdata, int max_length)
-{
- i_gen_write_data *self = mymalloc(sizeof(i_gen_write_data));
- self->cb = cb;
- self->userdata = userdata;
- self->maxlength = i_min(max_length, sizeof(self->buffer));
- if (self->maxlength < 0)
- self->maxlength = sizeof(self->buffer);
- self->filledto = 0;
-
- return self;
-}
-
-/*
-=item i_free_gen_write_data(i_gen_write_data *info, int flush)
-
-Cleans up the write buffer.
-
-Will flush any left-over data if I<flush> is non-zero.
-
-Returns non-zero if flush is zero or if info->cb() returns non-zero.
-
-Return zero only if flush is non-zero and info->cb() returns zero.
-ie. if it fails.
-
-=cut
-*/
-
-int i_free_gen_write_data(i_gen_write_data *info, int flush)
-{
- int result = !flush ||
- info->filledto == 0 ||
- info->cb(info->userdata, info->buffer, info->filledto);
- myfree(info);
-
- return result;
-}
-
struct magic_entry {
unsigned char *magic;
size_t magic_size;
unsigned char head[18];
ssize_t rc;
- io_glue_commit_types(data);
- rc = data->readcb(data, head, 18);
+ rc = i_io_peekn(data, head, 18);
if (rc == -1) return NULL;
- data->seekcb(data, -rc, SEEK_CUR);
+#if 0
+ {
+ int i;
+ fprintf(stderr, "%d bytes -", (int)rc);
+ for (i = 0; i < rc; ++i)
+ fprintf(stderr, " %02x", head[i]);
+ fprintf(stderr, "\n");
+ }
+#endif
for(i=0; i<sizeof(formats)/sizeof(formats[0]); i++) {
struct magic_entry const *entry = formats + i;
projects / imager.git / blobdiff