mirror of https://github.com/janet-lang/janet
284 lines
8.8 KiB
C
284 lines
8.8 KiB
C
/*
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* Copyright (c) 2018 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 <janet/janet.h>
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#include "gc.h"
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/* Initialize a buffer */
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JanetBuffer *janet_buffer_init(JanetBuffer *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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JANET_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 janet_buffer_deinit(JanetBuffer *buffer) {
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free(buffer->data);
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}
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/* Initialize a buffer */
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JanetBuffer *janet_buffer(int32_t capacity) {
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JanetBuffer *buffer = janet_gcalloc(JANET_MEMORY_BUFFER, sizeof(JanetBuffer));
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return janet_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 janet_buffer_ensure(JanetBuffer *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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JANET_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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/* Ensure that the buffer has enough internal capacity */
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void janet_buffer_setcount(JanetBuffer *buffer, int32_t count) {
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if (count < 0)
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return;
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if (count > buffer->count) {
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int32_t oldcount = buffer->count;
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janet_buffer_ensure(buffer, count);
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memset(buffer->data + oldcount, 0, count - oldcount);
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}
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buffer->count = count;
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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 janet_buffer_extra(JanetBuffer *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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JANET_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 janet_buffer_push_cstring(JanetBuffer *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 janet_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 janet_buffer_push_bytes(JanetBuffer *buffer, const uint8_t *string, int32_t length) {
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if (janet_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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int janet_buffer_push_string(JanetBuffer *buffer, const uint8_t *string) {
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return janet_buffer_push_bytes(buffer, string, janet_string_length(string));
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}
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/* Push a single byte to the buffer */
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int janet_buffer_push_u8(JanetBuffer *buffer, uint8_t byte) {
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if (janet_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 janet_buffer_push_u16(JanetBuffer *buffer, uint16_t x) {
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if (janet_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 janet_buffer_push_u32(JanetBuffer *buffer, uint32_t x) {
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if (janet_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 janet_buffer_push_u64(JanetBuffer *buffer, uint64_t x) {
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if (janet_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_new(JanetArgs args) {
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int32_t cap;
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JanetBuffer *buffer;
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JANET_FIXARITY(args, 1);
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JANET_ARG_INTEGER(cap, args, 0);
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buffer = janet_buffer(cap);
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JANET_RETURN_BUFFER(args, buffer);
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}
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static int cfun_u8(JanetArgs args) {
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int32_t i;
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JanetBuffer *buffer;
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JANET_MINARITY(args, 1);
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JANET_ARG_BUFFER(buffer, args, 0);
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for (i = 1; i < args.n; i++) {
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int32_t integer;
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JANET_ARG_INTEGER(integer, args, i);
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if (janet_buffer_push_u8(buffer, (uint8_t) (integer & 0xFF)))
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JANET_THROW(args, "buffer overflow");
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}
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_int(JanetArgs args) {
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int32_t i;
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JanetBuffer *buffer;
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JANET_MINARITY(args, 1);
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JANET_ARG_BUFFER(buffer, args, 0);
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for (i = 1; i < args.n; i++) {
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int32_t integer;
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JANET_ARG_INTEGER(integer, args, i);
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if (janet_buffer_push_u32(buffer, (uint32_t) integer))
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JANET_THROW(args, "buffer overflow");
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}
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_chars(JanetArgs args) {
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int32_t i;
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JanetBuffer *buffer;
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JANET_MINARITY(args, 1);
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JANET_ARG_BUFFER(buffer, args, 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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JANET_ARG_BYTES(str, len, args, i);
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if (janet_buffer_push_bytes(buffer, str, len))
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JANET_THROW(args, "buffer overflow");
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}
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_clear(JanetArgs args) {
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JanetBuffer *buffer;
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JANET_FIXARITY(args, 1);
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JANET_ARG_BUFFER(buffer, args, 0);
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buffer->count = 0;
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_popn(JanetArgs args) {
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JanetBuffer *buffer;
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int32_t n;
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JANET_FIXARITY(args, 2);
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JANET_ARG_BUFFER(buffer, args, 0);
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JANET_ARG_INTEGER(n, args, 1);
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if (buffer->count < n) {
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buffer->count = 0;
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} else {
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buffer->count -= n;
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}
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JANET_RETURN(args, args.v[0]);
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}
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static int cfun_slice(JanetArgs args) {
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const uint8_t *data;
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int32_t len, start, end;
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JanetBuffer *ret;
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JANET_ARG_BYTES(data, len, args, 0);
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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 (janet_checktype(args.v[1], JANET_INTEGER)) {
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start = janet_unwrap_integer(args.v[1]);
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} else {
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JANET_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 (janet_checktype(args.v[2], JANET_INTEGER)) {
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end = janet_unwrap_integer(args.v[2]);
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} else {
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JANET_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 = janet_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 = janet_buffer(0);
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}
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JANET_RETURN_BUFFER(args, ret);
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}
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static const JanetReg cfuns[] = {
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{"buffer.new", cfun_new},
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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.popn", cfun_popn},
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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 janet_lib_buffer(JanetArgs args) {
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JanetTable *env = janet_env(args);
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janet_cfuns(env, NULL, cfuns);
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return 0;
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}
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