static int checkbmp(unsigned char *mem)
{
+#define CHECK_HEADER_FIELD(mem, field) ((mem[0] == field[0]) && (mem[1] == field[0]))
+
int ret_val = 0;
BMPINFOHEADER bmi;
unsigned int u;
if (mem) {
- if ((mem[0] == 'B') && (mem[1] == 'M')) {
+ if (CHECK_HEADER_FIELD(mem, "BM") ||
+ CHECK_HEADER_FIELD(mem, "BA") ||
+ CHECK_HEADER_FIELD(mem, "CI") ||
+ CHECK_HEADER_FIELD(mem, "CP") ||
+ CHECK_HEADER_FIELD(mem, "IC") ||
+ CHECK_HEADER_FIELD(mem, "PT"))
+ {
/* skip fileheader */
mem += BMP_FILEHEADER_SIZE;
}
else {
+ return 0;
}
/* for systems where an int needs to be 4 bytes aligned */
}
return(ret_val);
+
+#undef CHECK_HEADER_FIELD
}
int imb_is_a_bmp(unsigned char *buf)
#define JP2_FILEHEADER_SIZE 14
static char JP2_HEAD[] = {0x0, 0x0, 0x0, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A};
+static char J2K_HEAD[] = {0xFF, 0x4F, 0xFF, 0x51, 0x00};
/* We only need this because of how the presets are set */
/* this typedef is copied from 'openjpeg-1.5.0/applications/codec/image_to_j2k.c' */
static int check_jp2(unsigned char *mem) /* J2K_CFMT */
{
- return memcmp(JP2_HEAD, mem, 12) ? 0 : 1;
+ return memcmp(JP2_HEAD, mem, sizeof(JP2_HEAD)) ? 0 : 1;
+}
+
+static int check_j2k(unsigned char *mem) /* J2K_CFMT */
+{
+ return memcmp(J2K_HEAD, mem, sizeof(J2K_HEAD)) ? 0 : 1;
}
int imb_is_a_jp2(unsigned char *buf)
-{
+{
return check_jp2(buf);
}
-
/**
* sample error callback expecting a FILE* client object
*/
unsigned int i, i_next, w, h, planes;
unsigned int y;
int *r, *g, *b, *a; /* matching 'opj_image_comp.data' type */
+ int is_jp2, is_j2k;
opj_dparameters_t parameters; /* decompression parameters */
opj_dinfo_t *dinfo = NULL; /* handle to a decompressor */
opj_cio_t *cio = NULL;
- if (check_jp2(mem) == 0) return(NULL);
+ is_jp2 = check_jp2(mem);
+ is_j2k = check_j2k(mem);
+
+ if (!is_jp2 && !is_j2k)
+ return(NULL);
/* configure the event callbacks (not required) */
memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
/* JPEG 2000 compressed image data */
/* get a decoder handle */
- dinfo = opj_create_decompress(CODEC_JP2);
+ dinfo = opj_create_decompress(is_jp2 ? CODEC_JP2 : CODEC_J2K);
/* catch events using our callbacks and give a local context */
opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, stderr);