81d715099c
Right now, we have to keep the buffer FFI object in sync with the definition of yp_buffer_t because we access its fields directly. If we add more fields or change the order, things will get out of sync. Instead, let's treat yp_buffer_t as an opaque pointer and access its fields through accessor functions directly. This is more consistent with how we handle strings anyway. https://github.com/ruby/yarp/commit/878d845eff
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
#include "yarp/util/yp_buffer.h"
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#define YP_BUFFER_INITIAL_SIZE 1024
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// Return the size of the yp_buffer_t struct.
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size_t
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yp_buffer_sizeof(void) {
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return sizeof(yp_buffer_t);
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}
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// Initialize a yp_buffer_t with its default values.
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bool
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yp_buffer_init(yp_buffer_t *buffer) {
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buffer->length = 0;
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buffer->capacity = YP_BUFFER_INITIAL_SIZE;
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buffer->value = (char *) malloc(YP_BUFFER_INITIAL_SIZE);
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return buffer->value != NULL;
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}
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// Return the value of the buffer.
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char *
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yp_buffer_value(yp_buffer_t *buffer) {
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return buffer->value;
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}
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// Return the length of the buffer.
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size_t
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yp_buffer_length(yp_buffer_t *buffer) {
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return buffer->length;
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}
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// Append the given amount of space to the buffer.
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static inline void
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yp_buffer_append_length(yp_buffer_t *buffer, size_t length) {
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size_t next_length = buffer->length + length;
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if (next_length > buffer->capacity) {
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do {
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buffer->capacity *= 2;
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} while (next_length > buffer->capacity);
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buffer->value = realloc(buffer->value, buffer->capacity);
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}
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buffer->length = next_length;
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}
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// Append a generic pointer to memory to the buffer.
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static inline void
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yp_buffer_append(yp_buffer_t *buffer, const void *source, size_t length) {
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yp_buffer_append_length(buffer, length);
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memcpy(buffer->value + (buffer->length - length), source, length);
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}
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// Append the given amount of space as zeroes to the buffer.
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void
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yp_buffer_append_zeroes(yp_buffer_t *buffer, size_t length) {
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yp_buffer_append_length(buffer, length);
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memset(buffer->value + (buffer->length - length), 0, length);
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}
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// Append a string to the buffer.
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void
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yp_buffer_append_str(yp_buffer_t *buffer, const char *value, size_t length) {
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const void *source = value;
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yp_buffer_append(buffer, source, length);
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}
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// Append a single byte to the buffer.
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void
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yp_buffer_append_u8(yp_buffer_t *buffer, uint8_t value) {
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const void *source = &value;
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yp_buffer_append(buffer, source, sizeof(uint8_t));
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}
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// Append a 32-bit unsigned integer to the buffer.
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void
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yp_buffer_append_u32(yp_buffer_t *buffer, uint32_t value) {
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if (value < 128) {
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yp_buffer_append_u8(buffer, (uint8_t) value);
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} else {
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uint32_t n = value;
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while (n >= 128) {
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yp_buffer_append_u8(buffer, (uint8_t) (n | 128));
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n >>= 7;
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}
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yp_buffer_append_u8(buffer, (uint8_t) n);
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}
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}
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// Free the memory associated with the buffer.
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void
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yp_buffer_free(yp_buffer_t *buffer) {
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free(buffer->value);
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}
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