switch usize to i64 in FFI

Signed-off-by: Andrew Whitehead <[email protected]>

indy-credx/src/ffi/credential.rs

@@ -70,13 +70,13 @@ pub extern "C" fn credx_create_credential(
                 "Mismatch between length of attribute names and raw values"
             ));
         }
-        let enc_values = attr_enc_values.as_slice();
+        let enc_values = attr_enc_values.as_slice()?;
         let mut cred_values = MakeCredentialValues::default();
-        let mut attr_idx = 0;
-        for (name, raw) in attr_names
-            .as_slice()
-            .into_iter()
-            .zip(attr_raw_values.as_slice())
+        for (attr_idx, (name, raw)) in attr_names
+            .as_slice()?
+            .iter()
+            .zip(attr_raw_values.as_slice()?)
+            .enumerate()
         {
             let name = name
                 .as_opt_str()
@@ -96,12 +96,11 @@ pub extern "C" fn credx_create_credential(
             } else {
                 cred_values.add_raw(name, raw)?;
             }
-            attr_idx += 1;
         }
         let revocation_config = if !revocation.is_null() {
             let revocation = unsafe { &*revocation };
             let mut reg_used = HashSet::new();
-            for reg_idx in revocation.reg_used.as_slice() {
+            for reg_idx in revocation.reg_used.as_slice()? {
                 reg_used.insert(
                     (*reg_idx)
                         .try_into()
@@ -157,7 +156,7 @@ pub extern "C" fn credx_encode_credential_attributes(
 ) -> ErrorCode {
     catch_error(|| {
         let mut result = String::new();
-        for raw_val in attr_raw_values.as_slice() {
+        for raw_val in attr_raw_values.as_slice()? {
             let enc_val = encode_credential_attribute(
                 raw_val
                     .as_opt_str()

indy-credx/src/ffi/error.rs

@@ -11,7 +11,7 @@ use once_cell::sync::Lazy;
 static LAST_ERROR: Lazy<RwLock<Option<Error>>> = Lazy::new(|| RwLock::new(None));
 
 #[derive(Debug, PartialEq, Copy, Clone, Serialize)]
-#[repr(usize)]
+#[repr(i64)]
 pub enum ErrorCode {
     Success = 0,
     Input = 1,

indy-credx/src/ffi/mod.rs

@@ -10,7 +10,7 @@ ffi_support::define_string_destructor!(credx_string_free);
 #[no_mangle]
 pub extern "C" fn credx_buffer_free(buffer: ByteBuffer) {
     ffi_support::abort_on_panic::with_abort_on_panic(|| {
-        drop(buffer.destroy_into_vec().zeroize());
+        buffer.destroy_into_vec().zeroize();
     })
 }
 

indy-credx/src/ffi/presentation.rs

@@ -76,26 +76,16 @@ pub extern "C" fn credx_create_presentation(
             ));
         }
 
-        let entries = {
-            let credentials = credentials.as_slice();
-            credentials.into_iter().try_fold(
-                Vec::with_capacity(credentials.len()),
-                |mut r, ffi_entry| {
-                    r.push(ffi_entry.load()?);
-                    Result::Ok(r)
-                },
-            )?
-        };
-
-        let schemas = IndyObjectList::load(schemas.as_slice())?;
-        let cred_defs = IndyObjectList::load(cred_defs.as_slice())?;
+        let entries = credentials.try_collect(|entry| entry.load())?;
+        let schemas = IndyObjectList::load(schemas.as_slice()?)?;
+        let cred_defs = IndyObjectList::load(cred_defs.as_slice()?)?;
 
         let self_attested = if !self_attest_names.is_empty() {
             let mut self_attested = HashMap::new();
             for (name, raw) in self_attest_names
-                .as_slice()
-                .into_iter()
-                .zip(self_attest_values.as_slice())
+                .as_slice()?
+                .iter()
+                .zip(self_attest_values.as_slice()?)
             {
                 let name = name
                     .as_opt_str()
@@ -125,7 +115,7 @@ pub extern "C" fn credx_create_presentation(
                     .transpose()?,
             );
 
-            for prove in credentials_prove.as_slice() {
+            for prove in credentials_prove.as_slice()? {
                 if prove.entry_idx < 0 {
                     return Err(err_msg!("Invalid credential index"));
                 }
@@ -239,19 +229,10 @@ fn _credx_verify_presentation(
     result_p: *mut i8,
 ) -> ErrorCode {
     catch_error(|| {
-        let schemas = IndyObjectList::load(schemas.as_slice())?;
-        let cred_defs = IndyObjectList::load(cred_defs.as_slice())?;
-        let rev_reg_defs = IndyObjectList::load(rev_reg_defs.as_slice())?;
-        let rev_reg_entries = {
-            let entries = rev_reg_entries.as_slice();
-            entries.into_iter().try_fold(
-                Vec::with_capacity(entries.len()),
-                |mut r, ffi_entry| {
-                    r.push(ffi_entry.load()?);
-                    Result::Ok(r)
-                },
-            )?
-        };
+        let schemas = IndyObjectList::load(schemas.as_slice()?)?;
+        let cred_defs = IndyObjectList::load(cred_defs.as_slice()?)?;
+        let rev_reg_defs = IndyObjectList::load(rev_reg_defs.as_slice()?)?;
+        let rev_reg_entries = rev_reg_entries.try_collect(|entry| entry.load())?;
         let mut rev_regs = HashMap::new();
         for (idx, entry, timestamp) in rev_reg_entries.iter() {
             if *idx > rev_reg_defs.len() {

indy-credx/src/ffi/revocation.rs

@@ -99,8 +99,8 @@ pub extern "C" fn credx_update_revocation_registry(
     catch_error(|| {
         check_useful_c_ptr!(rev_reg_p);
         check_useful_c_ptr!(rev_reg_delta_p);
-        let issued = registry_indices_to_set(issued.as_slice().into_iter().cloned())?;
-        let revoked = registry_indices_to_set(revoked.as_slice().into_iter().cloned())?;
+        let issued = registry_indices_to_set(issued.as_slice()?.iter().cloned())?;
+        let revoked = registry_indices_to_set(revoked.as_slice()?.iter().cloned())?;
         let (rev_reg, rev_reg_delta) = update_revocation_registry(
             cred_def.load()?.cast_ref()?,
             rev_reg_def.load()?.cast_ref()?,

indy-credx/src/ffi/util.rs

@@ -8,29 +8,26 @@ use crate::error::Result;
 #[derive(Debug)]
 #[repr(C)]
 pub struct FfiList<'a, T> {
-    count: usize,
+    count: i64,
     data: *const T,
     _pd: PhantomData<&'a ()>,
 }
 
 impl<'a, T> FfiList<'a, T> {
     #[inline]
-    pub fn as_slice(&self) -> &[T] {
-        if self.data.is_null() {
-            &[]
+    pub fn as_slice(&self) -> Result<&[T]> {
+        if self.data.is_null() || self.count == 0 {
+            Ok(&[])
+        } else if self.count < 0 {
+            return Err(err_msg!(Input, "Invalid index for result set"));
         } else {
-            unsafe { slice::from_raw_parts(self.data, self.count) }
+            Ok(unsafe { slice::from_raw_parts(self.data, self.count as usize) })
         }
     }
 
     #[inline]
-    pub fn try_collect<R>(&self, mut f: impl FnMut(&T) -> Result<R>) -> Result<Vec<R>> {
-        self.as_slice()
-            .into_iter()
-            .try_fold(Vec::with_capacity(self.len()), |mut rs, v| {
-                rs.push(f(v)?);
-                Ok(rs)
-            })
+    pub fn try_collect<R>(&self, f: impl FnMut(&T) -> Result<R>) -> Result<Vec<R>> {
+        self.as_slice()?.iter().map(f).collect()
     }
 
     #[inline]
@@ -39,7 +36,7 @@ impl<'a, T> FfiList<'a, T> {
     }
 
     #[inline]
-    pub fn len(&self) -> usize {
+    pub fn len(&self) -> i64 {
         if self.data.is_null() {
             0
         } else {

wrappers/python/indy_credx/bindings.py

@@ -16,7 +16,6 @@
     c_char_p,
     c_int8,
     c_int64,
-    c_size_t,
     c_ubyte,
     pointer,
 )
@@ -230,7 +229,7 @@ def _cleanup(cls, buffer: c_char_p):
 
 class FfiObjectHandleList(Structure):
     _fields_ = [
-        ("count", c_size_t),
+        ("count", c_int64),
         ("data", POINTER(ObjectHandle)),
     ]
 
@@ -246,7 +245,7 @@ def create(cls, values: Optional[Sequence[ObjectHandle]]) -> "FfiObjectHandleLis
 
 class FfiIntList(Structure):
     _fields_ = [
-        ("count", c_size_t),
+        ("count", c_int64),
         ("data", POINTER(c_int64)),
     ]
 
@@ -262,7 +261,7 @@ def create(cls, values: Optional[Sequence[str]]) -> "FfiIntList":
 
 class FfiStrList(Structure):
     _fields_ = [
-        ("count", c_size_t),
+        ("count", c_int64),
         ("data", POINTER(c_char_p)),
     ]
 
@@ -796,7 +795,9 @@ def verify_presentation(
         entry_list.count = len(rev_regs)
         entry_list.data = (RevocationEntry * entry_list.count)(*rev_regs)
     do_call(
-        "credx_verify_presentation_legacy" if accept_legacy_revocation else "credx_verify_presentation",
+        "credx_verify_presentation_legacy"
+        if accept_legacy_revocation
+        else "credx_verify_presentation",
         presentation,
         pres_req,
         FfiObjectHandleList.create(schemas),