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[cmph] do our own definitions

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so we don't import headers any more.
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Motiejus Jakštys 2022-03-20 08:42:22 +01:00 committed by Motiejus Jakštys
parent f4012c8694
commit 787fbcf375
1 changed files with 42 additions and 17 deletions
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59
src/cmph.zig
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@ -5,32 +5,50 @@ const sort = std.sort;
const bdz = @import("bdz.zig");
const c = @cImport({
@cInclude("cmph.h");
});
// must be kept in sync with the definition in cmph_types.h
const CMPH_ALGO = enum(c_int) {
CMPH_BMZ,
CMPH_BMZ8,
CMPH_CHM,
CMPH_BRZ,
CMPH_FCH,
CMPH_BDZ,
CMPH_BDZ_PH,
CMPH_CHD_PH,
CMPH_CHD,
CMPH_COUNT,
};
extern fn cmph_io_vector_adapter(vector: [*]const [*:0]const u8, len: c_uint) [*]u8;
extern fn cmph_io_vector_adapter_destroy(key_source: [*]u8) void;
extern fn cmph_config_new(key_source: [*]const u8) ?[*]u8;
extern fn cmph_config_set_algo(mph: [*]u8, algo: c_int) void;
extern fn cmph_config_set_b(mph: [*]u8, b: c_int) void;
extern fn cmph_new(config: [*]const u8) ?[*]const u8;
extern fn cmph_config_destroy(mph: [*]u8) void;
extern fn cmph_packed_size(mphf: [*]const u8) u32;
extern fn cmph_pack(mphf: [*]const u8, packed_mphf: [*]u8) void;
extern fn cmph_destroy(mphf: [*]const u8) void;
// pack packs cmph hashes for the given input and returns a slice ("cmph pack
// minus first 4 bytes") for further storage. The slice must be freed by the
// caller.
pub const Error = Allocator.Error || error{Overflow};
pub fn pack(allocator: Allocator, input: [][*:0]const u8) Error![]const u8 {
var source = c.cmph_io_vector_adapter(
@ptrCast(*[*c]u8, input.ptr),
try math.cast(c_uint, input.len),
);
defer c.cmph_io_vector_adapter_destroy(source);
var config: *c.cmph_config_t = c.cmph_config_new(source) orelse
return error.OutOfMemory;
c.cmph_config_set_algo(config, c.CMPH_BDZ);
c.cmph_config_set_b(config, 7);
var hash: *c.cmph_t = c.cmph_new(config) orelse return error.OutOfMemory;
c.cmph_config_destroy(config);
const input_len = try math.cast(c_uint, input.len);
var source = cmph_io_vector_adapter(input.ptr, input_len);
defer cmph_io_vector_adapter_destroy(source);
var config = cmph_config_new(source) orelse return error.OutOfMemory;
cmph_config_set_algo(config, @enumToInt(CMPH_ALGO.CMPH_BDZ));
cmph_config_set_b(config, 7);
var mph = cmph_new(config) orelse return error.OutOfMemory;
cmph_config_destroy(config);
const size = c.cmph_packed_size(hash);
const size = cmph_packed_size(mph);
var buf = try allocator.alloc(u8, size);
errdefer allocator.free(buf);
c.cmph_pack(hash, &buf[0]);
c.cmph_destroy(hash);
cmph_pack(mph, buf.ptr);
cmph_destroy(mph);
return buf[4..];
}
@ -142,3 +160,10 @@ test "pack str" {
for (hashes) |hash, i|
try testing.expectEqual(i, hash);
}
test "CMPH_ALGO is in sync" {
const c = @cImport({
@cInclude("cmph_types.h");
});
try testing.expectEqual(c.CMPH_BDZ, @enumToInt(CMPH_ALGO.CMPH_BDZ));
}