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impl_buffer.c
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318 lines (272 loc) · 8.77 KB
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#include "devs_internal.h"
static const void *buffer_data(devs_ctx_t *ctx, value_t v, unsigned *sz) {
if (!devs_is_buffer(ctx, v)) {
devs_throw_expecting_error(ctx, DEVS_BUILTIN_STRING_BUFFER, v);
return NULL;
}
return devs_buffer_data(ctx, v, sz);
}
static void *wr_buffer_data(devs_ctx_t *ctx, value_t v, unsigned *sz) {
if (!devs_buffer_is_writable(ctx, v)) {
devs_throw_expecting_error_ext(ctx, "mutable Buffer", v);
return NULL;
}
return devs_buffer_data(ctx, v, sz);
}
void fun1_Buffer_alloc(devs_ctx_t *ctx) {
unsigned sz = devs_arg_int(ctx, 0);
devs_ret_gc_ptr(ctx, devs_buffer_try_alloc(ctx, sz));
}
#define ENC_NULL 0
#define ENC_HEX 1
#define ENC_UTF 2
#define ENC_ERR -1
static int get_encoding(devs_ctx_t *ctx, value_t enc) {
if (devs_is_null_or_undefined(enc))
return ENC_NULL;
if (devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_HEX)) {
return ENC_HEX;
} else if (devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_UTF8) ||
devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_UTF_8)) {
return ENC_UTF;
} else {
devs_throw_type_error(ctx, "Unknown encoding: %s", devs_show_value(ctx, enc));
return ENC_ERR;
}
}
void fun2_Buffer_from(devs_ctx_t *ctx) {
value_t v = devs_arg(ctx, 0);
int enc = get_encoding(ctx, devs_arg(ctx, 1));
unsigned sz;
const uint8_t *d = devs_bufferish_data(ctx, v, &sz);
devs_buffer_t *buf = NULL;
if (enc == ENC_ERR)
return;
if (enc != ENC_NULL && !devs_is_string(ctx, v)) {
devs_throw_expecting_error(ctx, DEVS_BUILTIN_STRING_STRING, v);
return;
}
if (d) {
if (enc == ENC_HEX) {
sz = jd_from_hex(NULL, (const char *)d);
buf = devs_buffer_try_alloc(ctx, sz);
if (buf)
jd_from_hex(buf->data, (const char *)d);
} else {
buf = devs_buffer_try_alloc_init(ctx, d, sz);
}
} else {
if (devs_is_array(ctx, v)) {
devs_array_t *arr = devs_value_to_gc_obj(ctx, v);
buf = devs_buffer_try_alloc(ctx, arr->length);
if (buf)
for (unsigned i = 0; i < arr->length; ++i)
buf->data[i] = devs_value_to_int(ctx, arr->data[i]);
} else {
devs_throw_type_error(ctx, "Expecting string, buffer or array");
}
}
devs_ret_gc_ptr(ctx, buf);
}
value_t prop_Buffer_length(devs_ctx_t *ctx, value_t self) {
unsigned sz;
if (buffer_data(ctx, self, &sz))
return devs_value_from_int(sz);
else
return devs_undefined;
}
void meth1_Buffer_toString(devs_ctx_t *ctx) {
unsigned sz;
value_t enc = devs_arg(ctx, 0);
const uint8_t *data = buffer_data(ctx, devs_arg_self(ctx), &sz);
if (data) {
if (devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_HEX)) {
devs_string_t *s = devs_string_try_alloc(ctx, sz * 2);
if (s)
jd_to_hex(s->data, data, sz);
devs_ret_gc_ptr(ctx, s);
} else if (devs_is_null_or_undefined(enc) ||
devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_UTF8) ||
devs_value_eq_builtin_string(ctx, enc, DEVS_BUILTIN_STRING_UTF_8)) {
devs_ret(ctx, devs_string_from_utf8(ctx, data, sz));
} else {
devs_throw_type_error(ctx, "Unknown encoding: %s", devs_show_value(ctx, enc));
}
}
}
void meth3_Buffer_fillAt(devs_ctx_t *ctx) {
unsigned dlen;
uint8_t *dst = wr_buffer_data(ctx, devs_arg_self(ctx), &dlen);
if (dst == NULL)
return;
unsigned dst_offset = devs_arg_int(ctx, 0);
unsigned len = devs_arg_int(ctx, 1);
unsigned val = devs_arg_int(ctx, 2);
if (dst_offset >= dlen)
return;
dlen -= dst_offset;
if (dlen < len)
len = dlen;
memset(dst + dst_offset, val, len);
}
void meth4_Buffer_blitAt(devs_ctx_t *ctx) {
unsigned slen, dlen;
uint8_t *dst = wr_buffer_data(ctx, devs_arg_self(ctx), &dlen);
if (dst == NULL)
return;
uint32_t dst_offset = devs_arg_int(ctx, 0);
value_t src_ = devs_arg(ctx, 1);
const uint8_t *src = devs_is_string(ctx, src_) ? devs_string_get_utf8(ctx, src_, &slen)
: buffer_data(ctx, src_, &slen);
if (src == NULL)
return;
uint32_t src_offset = devs_arg_int(ctx, 2);
uint32_t len = devs_arg_int(ctx, 3);
if (src_offset >= slen)
return;
slen -= src_offset;
if (slen < len)
len = slen;
if (dst_offset >= dlen)
return;
dlen -= dst_offset;
if (dlen < len)
len = dlen;
memcpy(dst + dst_offset, src + src_offset, len);
}
int devs_clamp_size(int v, int max) {
if (v < 0)
return 0;
if (v > max)
return max;
return v;
}
void meth3_Buffer_indexOf(devs_ctx_t *ctx) {
unsigned sz;
const uint8_t *data = buffer_data(ctx, devs_arg_self(ctx), &sz);
if (!data)
return;
int ch = devs_arg_int(ctx, 0);
int start_pos = devs_arg_int(ctx, 1);
int end_pos = devs_arg_int_defl(ctx, 2, sz);
int rev = 0;
start_pos = devs_clamp_size(start_pos, sz);
if (end_pos < 0) {
rev = 1;
end_pos = -end_pos;
}
end_pos = devs_clamp_size(end_pos, sz);
int r = -1;
if (rev) {
end_pos--;
while (start_pos <= end_pos) {
if (data[end_pos] == ch) {
r = end_pos;
break;
}
end_pos--;
}
} else {
while (start_pos < end_pos) {
if (data[start_pos] == ch) {
r = start_pos;
break;
}
start_pos++;
}
}
devs_ret_int(ctx, r);
}
//
// Crypto
//
void meth0_Buffer_fillRandom(devs_ctx_t *ctx) {
unsigned dlen;
uint8_t *dst = wr_buffer_data(ctx, devs_arg_self(ctx), &dlen);
if (dst == NULL)
return;
jd_crypto_get_random(dst, dlen);
}
void meth4_Buffer_encrypt(devs_ctx_t *ctx) {
unsigned slen, klen, ivlen;
const uint8_t *src = buffer_data(ctx, devs_arg_self(ctx), &slen);
const char *algo = devs_string_get_utf8(ctx, devs_arg(ctx, 0), NULL);
const uint8_t *key = buffer_data(ctx, devs_arg(ctx, 1), &klen);
const uint8_t *iv = buffer_data(ctx, devs_arg(ctx, 2), &ivlen);
int tagLen = devs_arg_int_defl(ctx, 3, -1);
bool encrypt = true;
if (tagLen >= 0x1000) {
encrypt = false;
tagLen -= 0x1000;
}
if (strcmp(algo, "aes-256-ccm") != 0)
return;
if (src == NULL || klen != JD_AES_KEY_BYTES || ivlen != JD_AES_CCM_NONCE_BYTES)
return;
if (tagLen < 0 || tagLen > 16)
return;
int dlen = (int)slen;
if (encrypt)
dlen += tagLen;
else
dlen -= tagLen;
if (dlen < 0) {
devs_throw_generic_error(ctx, "encrypted data (len=%u) shorter than tagLen (%u)", slen,
tagLen);
return;
}
devs_buffer_t *dst = devs_buffer_try_alloc(ctx, dlen);
if (dst == NULL)
return;
devs_ret_gc_ptr(ctx, dst);
if (encrypt) {
memcpy(dst->data, src, slen);
jd_aes_ccm_encrypt(key, iv, dst->data + slen, tagLen, dst->data, slen);
} else {
uint8_t tag[tagLen + 1];
memcpy(tag, src + dlen, tagLen);
memcpy(dst->data, src, dlen);
int r = jd_aes_ccm_decrypt(key, iv, tag, tagLen, dst->data, dlen);
if (r) {
devs_throw_generic_error(ctx, "encryption tag mismatch");
devs_ret(ctx, devs_undefined);
}
}
}
void fun3_Buffer_digest(devs_ctx_t *ctx) {
unsigned klen;
const uint8_t *key = devs_bufferish_data(ctx, devs_arg(ctx, 0), &klen);
const char *algo = devs_string_get_utf8(ctx, devs_arg(ctx, 1), NULL);
value_t other = devs_arg(ctx, 2);
if (!devs_is_array(ctx, other)) {
devs_throw_expecting_error(ctx, DEVS_BUILTIN_STRING_ARRAY, other);
return;
}
devs_array_t *data = devs_value_to_gc_obj(ctx, other);
if (strcmp(algo, "sha256") != 0)
return;
if (key)
jd_sha256_hmac_setup(key, klen);
else
jd_sha256_setup();
for (unsigned i = 0; i < data->length; ++i) {
unsigned sz;
const uint8_t *d = devs_bufferish_data(ctx, data->data[i], &sz);
if (!d) {
devs_throw_expecting_error(ctx, DEVS_BUILTIN_STRING_BUFFER, data->data[i]);
return;
}
if (key)
jd_sha256_hmac_update(d, sz);
else
jd_sha256_update(d, sz);
}
devs_buffer_t *buf = devs_buffer_try_alloc(ctx, JD_SHA256_HASH_BYTES);
if (buf == NULL)
return;
devs_ret_gc_ptr(ctx, buf);
if (key)
jd_sha256_hmac_finish(buf->data);
else
jd_sha256_finish(buf->data);
}