mirror of
https://github.com/janet-lang/janet
synced 2024-06-30 09:03:15 +00:00
238 lines
8.1 KiB
C
238 lines
8.1 KiB
C
/*
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* Copyright (c) 2017 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <dst/dst.h>
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#include "gc.h"
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/* Initialize a buffer */
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DstBuffer *dst_buffer_init(DstBuffer *buffer, int32_t capacity) {
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uint8_t *data = NULL;
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if (capacity > 0) {
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data = malloc(sizeof(uint8_t) * capacity);
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if (NULL == data) {
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DST_OUT_OF_MEMORY;
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}
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}
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buffer->count = 0;
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buffer->capacity = capacity;
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buffer->data = data;
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return buffer;
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}
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/* Deinitialize a buffer (free data memory) */
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void dst_buffer_deinit(DstBuffer *buffer) {
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free(buffer->data);
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}
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/* Initialize a buffer */
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DstBuffer *dst_buffer(int32_t capacity) {
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DstBuffer *buffer = dst_gcalloc(DST_MEMORY_BUFFER, sizeof(DstBuffer));
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return dst_buffer_init(buffer, capacity);
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}
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/* Ensure that the buffer has enough internal capacity */
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void dst_buffer_ensure(DstBuffer *buffer, int32_t capacity) {
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uint8_t *new_data;
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uint8_t *old = buffer->data;
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if (capacity <= buffer->capacity) return;
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new_data = realloc(old, capacity * sizeof(uint8_t));
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if (NULL == new_data) {
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DST_OUT_OF_MEMORY;
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}
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buffer->data = new_data;
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buffer->capacity = capacity;
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}
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/* Adds capacity for enough extra bytes to the buffer. Ensures that the
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* next n bytes pushed to the buffer will not cause a reallocation */
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int dst_buffer_extra(DstBuffer *buffer, int32_t n) {
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/* Check for buffer overflow */
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if ((int64_t)n + buffer->count > INT32_MAX) {
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return -1;
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}
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int32_t new_size = buffer->count + n;
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if (new_size > buffer->capacity) {
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int32_t new_capacity = new_size * 2;
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uint8_t *new_data = realloc(buffer->data, new_capacity * sizeof(uint8_t));
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if (NULL == new_data) {
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DST_OUT_OF_MEMORY;
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}
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buffer->data = new_data;
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buffer->capacity = new_capacity;
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}
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return 0;
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}
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/* Push a cstring to buffer */
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int dst_buffer_push_cstring(DstBuffer *buffer, const char *cstring) {
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int32_t len = 0;
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while (cstring[len]) ++len;
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return dst_buffer_push_bytes(buffer, (const uint8_t *) cstring, len);
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}
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/* Push multiple bytes into the buffer */
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int dst_buffer_push_bytes(DstBuffer *buffer, const uint8_t *string, int32_t length) {
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if (dst_buffer_extra(buffer, length)) return -1;
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memcpy(buffer->data + buffer->count, string, length);
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buffer->count += length;
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return 0;
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}
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/* Push a single byte to the buffer */
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int dst_buffer_push_u8(DstBuffer *buffer, uint8_t byte) {
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if (dst_buffer_extra(buffer, 1)) return -1;
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buffer->data[buffer->count] = byte;
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buffer->count++;
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return 0;
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}
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/* Push a 16 bit unsigned integer to the buffer */
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int dst_buffer_push_u16(DstBuffer *buffer, uint16_t x) {
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if (dst_buffer_extra(buffer, 2)) return -1;
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buffer->data[buffer->count] = x & 0xFF;
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buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
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buffer->count += 2;
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return 0;
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}
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/* Push a 32 bit unsigned integer to the buffer */
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int dst_buffer_push_u32(DstBuffer *buffer, uint32_t x) {
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if (dst_buffer_extra(buffer, 4)) return -1;
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buffer->data[buffer->count] = x & 0xFF;
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buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
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buffer->data[buffer->count + 2] = (x >> 16) & 0xFF;
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buffer->data[buffer->count + 3] = (x >> 24) & 0xFF;
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buffer->count += 4;
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return 0;
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}
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/* Push a 64 bit unsigned integer to the buffer */
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int dst_buffer_push_u64(DstBuffer *buffer, uint64_t x) {
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if (dst_buffer_extra(buffer, 8)) return -1;
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buffer->data[buffer->count] = x & 0xFF;
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buffer->data[buffer->count + 1] = (x >> 8) & 0xFF;
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buffer->data[buffer->count + 2] = (x >> 16) & 0xFF;
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buffer->data[buffer->count + 3] = (x >> 24) & 0xFF;
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buffer->data[buffer->count + 4] = (x >> 32) & 0xFF;
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buffer->data[buffer->count + 5] = (x >> 40) & 0xFF;
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buffer->data[buffer->count + 6] = (x >> 48) & 0xFF;
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buffer->data[buffer->count + 7] = (x >> 56) & 0xFF;
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buffer->count += 8;
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return 0;
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}
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/* C functions */
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static int cfun_u8(DstArgs args) {
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int32_t i;
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DstBuffer *buffer;
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if (args.n < 1 || !dst_checktype(args.v[0], DST_BUFFER)) return dst_throw(args, "expected buffer");
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buffer = dst_unwrap_buffer(args.v[0]);
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for (i = 1; i < args.n; i++) {
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if (!dst_checktype(args.v[i], DST_INTEGER)) return dst_throw(args, "expected integer");
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if (dst_buffer_push_u8(buffer, (uint8_t) (dst_unwrap_integer(args.v[i]) & 0xFF))) return dst_throw(args, "buffer overflow");
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}
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return dst_return(args, args.v[0]);
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}
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static int cfun_int(DstArgs args) {
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int32_t i;
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DstBuffer *buffer;
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if (args.n < 1 || !dst_checktype(args.v[0], DST_BUFFER)) return dst_throw(args, "expected buffer");
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buffer = dst_unwrap_buffer(args.v[0]);
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for (i = 1; i < args.n; i++) {
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if (!dst_checktype(args.v[i], DST_INTEGER)) return dst_throw(args, "expected integer");
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if (dst_buffer_push_u32(buffer, (uint32_t) dst_unwrap_integer(args.v[i]))) return dst_throw(args, "buffer overflow");
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}
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return dst_return(args, args.v[0]);
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}
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static int cfun_chars(DstArgs args) {
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int32_t i;
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DstBuffer *buffer;
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if (args.n < 1 || !dst_checktype(args.v[0], DST_BUFFER)) return dst_throw(args, "expected buffer");
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buffer = dst_unwrap_buffer(args.v[0]);
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for (i = 1; i < args.n; i++) {
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int32_t len;
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const uint8_t *str;
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if (!dst_chararray_view(args.v[i], &str, &len)) return dst_throw(args, "expected string/buffer");
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if (dst_buffer_push_bytes(buffer, str, len)) return dst_throw(args, "buffer overflow");
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}
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return dst_return(args, args.v[0]);
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}
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static int cfun_clear(DstArgs args) {
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DstBuffer *buffer;
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if (args.n < 1 || !dst_checktype(args.v[0], DST_BUFFER)) return dst_throw(args, "expected buffer");
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buffer = dst_unwrap_buffer(args.v[0]);
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buffer->count = 0;
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return dst_return(args, args.v[0]);
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}
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static int cfun_slice(DstArgs args) {
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const uint8_t *data;
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int32_t len, start, end;
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DstBuffer *ret;
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if (args.n < 1 || !dst_chararray_view(args.v[0], &data, &len))
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return dst_throw(args, "expected buffer/string");
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/* Get start */
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if (args.n < 2) {
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start = 0;
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} else if (dst_checktype(args.v[1], DST_INTEGER)) {
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start = dst_unwrap_integer(args.v[1]);
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} else {
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return dst_throw(args, "expected integer");
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}
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/* Get end */
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if (args.n < 3) {
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end = -1;
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} else if (dst_checktype(args.v[2], DST_INTEGER)) {
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end = dst_unwrap_integer(args.v[2]);
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} else {
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return dst_throw(args, "expected integer");
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}
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if (start < 0) start = len + start;
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if (end < 0) end = len + end + 1;
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if (end >= start) {
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ret = dst_buffer(end - start);
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memcpy(ret->data, data + start, end - start);
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ret->count = end - start;
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} else {
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ret = dst_buffer(0);
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}
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return dst_return(args, dst_wrap_buffer(ret));
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}
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static const DstReg cfuns[] = {
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{"buffer-push-byte", cfun_u8},
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{"buffer-push-integer", cfun_int},
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{"buffer-push-string", cfun_chars},
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{"buffer-clear", cfun_clear},
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{"buffer-slice", cfun_slice},
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{NULL, NULL}
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};
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int dst_lib_buffer(DstArgs args) {
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DstTable *env = dst_env_arg(args);
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dst_env_cfuns(env, cfuns);
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return 0;
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}
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