[ismrmrd] 169/177: Added channel mask stuff to c-api.

[Ghislain Vaillant]

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ghisvail-guest pushed a commit to annotated tag v1.1.0.beta.1
in repository ismrmrd.

commit 49dcd11463c13a16e4c0de0b0735a557e7a7e7e8
Author: Souheil Inati <souheil.inati at nih.gov>
Date:   Tue Nov 4 12:43:38 2014 -0500

    Added channel mask stuff to c-api.
---
 examples/c/main.c         |  9 +++++++++
 include/ismrmrd/ismrmrd.h | 12 +++++++++++-
 libsrc/ismrmrd.c          | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 1 deletion(-)

diff --git a/examples/c/main.c b/examples/c/main.c
index 9a5e5b9..892bdf2 100644
--- a/examples/c/main.c
+++ b/examples/c/main.c
@@ -54,6 +54,10 @@ int main(void)
         ismrmrd_init_acquisition(&acq);
         acq.head.number_of_samples = 128;
         acq.head.active_channels = 4;
+        ismrmrd_clear_all_channels(acq.head.channel_mask);
+        for (k=0; k<acq.head.active_channels; k++) {
+            ismrmrd_set_channel_on(acq.head.channel_mask, k);
+        }
         ismrmrd_make_consistent_acquisition(&acq);
         for (k=0; k<acq.head.number_of_samples; k++) {
             for (c=0; c<acq.head.active_channels; c++) {
@@ -106,6 +110,11 @@ int main(void)
     ismrmrd_read_acquisition(&dataset2, index, &acq2);
     printf("Number of samples: %u\n", acq2.head.number_of_samples);
     printf("Flags: %llu\n", acq2.head.flags);
+    printf("Channel Mask[0]: %llu\n", acq2.head.channel_mask[0]);
+    printf("Channel Mask[1]: %llu\n", acq2.head.channel_mask[1]);
+    printf("Channel 3 is %d\n", ismrmrd_is_channel_on(acq2.head.channel_mask, 3));
+    printf("Channel 5 is %d\n", ismrmrd_is_channel_on(acq2.head.channel_mask, 5));
+    
 #ifdef _MSC_VER
     /* Windows C compilers don't have a good complex type */
     printf("Data 3: %f\t 2: %f\n", acq2.data[4].real, acq2.data[4].imag);
diff --git a/include/ismrmrd/ismrmrd.h b/include/ismrmrd/ismrmrd.h
index 6eb7110..0d3178a 100644
--- a/include/ismrmrd/ismrmrd.h
+++ b/include/ismrmrd/ismrmrd.h
@@ -368,7 +368,17 @@ EXPORTISMRMRD int ismrmrd_clear_flag(uint64_t *flags, const uint64_t val);
 EXPORTISMRMRD int ismrmrd_clear_all_flags(uint64_t *flags);
 /** @} */
 
-/** TODO: add helper functions for channel mask */
+/*****************/
+/* Channel Masks */
+/*****************/
+/** @addtogroup capi
+ *  @{
+ */
+EXPORTISMRMRD bool ismrmrd_is_channel_on(const uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan);
+EXPORTISMRMRD int ismrmrd_set_channel_on(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan);
+EXPORTISMRMRD int ismrmrd_set_channel_off(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan);
+EXPORTISMRMRD int ismrmrd_clear_all_channels(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS]);
+/** @} */
 
 /******************/
 /* Error Handling */
diff --git a/libsrc/ismrmrd.c b/libsrc/ismrmrd.c
index 6797fe6..e8b7905 100644
--- a/libsrc/ismrmrd.c
+++ b/libsrc/ismrmrd.c
@@ -513,6 +513,52 @@ int ismrmrd_clear_all_flags(uint64_t *flags) {
     return ISMRMRD_NOERROR;
 }
 
+bool ismrmrd_is_channel_on(const uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan) {
+    uint64_t bitmask;
+    size_t offset;
+    if (channel_mask==NULL) {
+        ISMRMRD_PUSH_ERR(ISMRMRD_RUNTIMEERROR, "Pointer to channel_mask should not be NULL.");
+    }
+    bitmask = 1 << (chan % 64);
+    offset = chan / 64;
+    return (channel_mask[offset] & bitmask) > 0;
+}
+
+int ismrmrd_set_channel_on(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan) {
+    uint64_t bitmask;
+    size_t offset;
+    if (channel_mask==NULL) {
+        return ISMRMRD_PUSH_ERR(ISMRMRD_RUNTIMEERROR, "Pointer to channel_mask should not be NULL.");
+    }
+    bitmask = 1 << (chan % ISMRMRD_CHANNEL_MASKS);
+    offset = chan / ISMRMRD_CHANNEL_MASKS;
+    channel_mask[offset] |= bitmask;
+    return ISMRMRD_NOERROR;
+}
+
+int ismrmrd_set_channel_off(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS], const uint16_t chan) {
+    uint64_t bitmask;
+    size_t offset;
+    if (channel_mask==NULL) {
+        return ISMRMRD_PUSH_ERR(ISMRMRD_RUNTIMEERROR, "Pointer to channel_mask should not be NULL.");
+    }
+    bitmask = 1 << (chan % 64);
+    offset = chan / 64;
+    channel_mask[offset] &= ~bitmask;
+    return ISMRMRD_NOERROR;
+}
+    
+int ismrmrd_clear_all_channels(uint64_t channel_mask[ISMRMRD_CHANNEL_MASKS]) {
+    size_t offset;
+    if (channel_mask==NULL) {
+        return ISMRMRD_PUSH_ERR(ISMRMRD_RUNTIMEERROR, "Pointer to channel_mask should not be NULL.");
+    }
+    for (offset = 0; offset<ISMRMRD_CHANNEL_MASKS; offset++) {
+        channel_mask[offset] = 0;
+    }
+    return ISMRMRD_NOERROR;
+}
+    
 int ismrmrd_sign_of_directions(float read_dir[3], float phase_dir[3], float slice_dir[3]) {
     float r11 = read_dir[0], r12 = phase_dir[0], r13 = slice_dir[0];
     float r21 = read_dir[1], r22 = phase_dir[1], r23 = slice_dir[1];

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