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#include <bh/internal/buffer.h>
#include <stdlib.h>
#include <string.h>
static const bh_io_table_t bh_buffer_table = {
(int (*)(struct bh_io_s *, int)) bh_buffer_open_base,
(void (*)(struct bh_io_s *)) bh_buffer_close_base,
(int (*)(struct bh_io_s *)) bh_buffer_is_open_base,
(size_t (*)(struct bh_io_s *, char *, size_t)) bh_buffer_read_base,
(size_t (*)(struct bh_io_s *, const char *, size_t)) bh_buffer_write_base,
(void (*)(struct bh_io_s *)) bh_buffer_flush_base,
(int (*)(struct bh_io_s *, bh_off_t, int)) bh_buffer_seek_base,
(bh_off_t (*)(struct bh_io_s *)) bh_buffer_size_base,
(bh_off_t (*)(struct bh_io_s *)) bh_buffer_tell_base,
(bh_off_t (*)(struct bh_io_s *)) bh_buffer_available_base,
(void (*)(struct bh_io_s *)) bh_buffer_clear_base,
(void (*)(struct bh_io_s *)) bh_buffer_destroy
};
bh_buffer_t *bh_buffer_new(void)
{
bh_buffer_t *result;
/* Allocate and initialize buffer structure */
result = malloc(sizeof(*result));
if (result && bh_buffer_init(result))
{
/* Something went wrong - free allocated memory */
free(result);
result = NULL;
}
return result;
}
void bh_buffer_free(bh_buffer_t *buffer)
{
bh_buffer_destroy(buffer);
free(buffer);
}
int bh_buffer_init(bh_buffer_t *buffer)
{
bh_io_init(&buffer->base, &bh_buffer_table);
buffer->data = NULL;
buffer->capacity = 0;
buffer->size = 0;
buffer->at = 0;
buffer->mode = 0;
return BH_OK;
}
void bh_buffer_destroy(bh_buffer_t *buffer)
{
bh_buffer_close(buffer);
if (buffer->data)
free(buffer->data);
}
const char *bh_buffer_data(bh_buffer_t *buffer)
{
return buffer->data;
}
void bh_buffer_set_data(bh_buffer_t *buffer,
const char *data,
size_t size)
{
buffer->size = 0;
bh_buffer_write_base(buffer, data, size);
}
size_t bh_buffer_capacity(bh_buffer_t *buffer)
{
return buffer->capacity;
}
int bh_buffer_reserve(bh_buffer_t *buffer,
size_t size)
{
char *data = NULL;
/* New capacity can't be less then current buffer size */
if (size < buffer->size)
size = buffer->size;
/* Prevent same size reallocation */
if (buffer->capacity == size)
return BH_OK;
/* Allocate new memory for the buffer */
if (size)
{
data = malloc(size);
if (!data)
return BH_OOM;
/* Copy data */
if (buffer->size)
memmove(data, buffer->data, buffer->size);
}
/* Free previosly allocated memory */
if (buffer->data)
free(buffer->data);
/* Update buffer fields */
buffer->data = data;
buffer->capacity = size;
return BH_OK;
}
int bh_buffer_open_base(bh_buffer_t *buffer,
int mode)
{
/* Check if buffer is already open */
if (buffer->mode != 0)
return BH_OK;
/* Update buffer mode field */
buffer->mode = mode;
/* Determine open mode */
switch (mode & BH_IO_MASK)
{
case BH_IO_OPEN:
case BH_IO_CREATE:
case BH_IO_APPEND:
break;
case BH_IO_TRUNCATE:
buffer->size = 0;
break;
default:
return BH_NO_IMPL;
}
return BH_OK;
}
void bh_buffer_close_base(bh_buffer_t *buffer)
{
buffer->mode = 0;
}
int bh_buffer_is_open_base(bh_buffer_t *buffer)
{
return buffer->mode != 0;
}
size_t bh_buffer_read_base(bh_buffer_t *buffer,
char *data,
size_t size)
{
/* Check if buffer openned in read mode */
if (!(buffer->mode & BH_IO_READ))
{
buffer->base.flags |= BH_IO_ERROR;
return 0;
}
/* Calculate maximum available size for reading */
if (size > buffer->size - buffer->at)
size = buffer->size - buffer->at;
/* Perform reading */
if (size)
{
memmove(data, buffer->data + buffer->at, size);
buffer->at += size;
}
/* Check for end of file */
if (!size)
buffer->base.flags |= BH_IO_EOF;
else
buffer->base.flags &= ~BH_IO_EOF;
return size;
}
size_t bh_buffer_write_base(bh_buffer_t *buffer,
const char *data,
size_t size)
{
size_t capacity = 0;
/* Check if buffer is openned in write mode */
if (!(buffer->mode & BH_IO_WRITE))
{
buffer->base.flags |= BH_IO_ERROR;
return 0;
}
/* Adjust at position */
if ((buffer->mode & BH_IO_MASK) == BH_IO_APPEND)
buffer->at = buffer->size;
/* Calculate required capacity and check for overflow */
capacity = buffer->at + size;
if (capacity < size)
{
buffer->base.flags |= BH_IO_ERROR;
return 0;
}
/* Try to grow buffer */
if (buffer->capacity < capacity)
bh_buffer_reserve(buffer, capacity);
/* Calculate maximum write size */
if (size > buffer->capacity - buffer->at)
size = buffer->capacity - buffer->at;
/* Perform writing */
if (size)
{
memmove(buffer->data + buffer->at, data, size);
buffer->at += size;
buffer->size += size;
}
/* Check for end of file */
if (!size)
buffer->base.flags |= BH_IO_EOF;
else
buffer->base.flags &= ~BH_IO_EOF;
return size;
}
void bh_buffer_flush_base(bh_buffer_t *buffer)
{
(void)buffer;
}
int bh_buffer_seek_base(bh_buffer_t *buffer,
bh_off_t pos,
int dir)
{
switch (dir)
{
case BH_IO_SET: buffer->at = pos; break;
case BH_IO_CURRENT: buffer->at += pos; break;
case BH_IO_END: buffer->at = buffer->size - pos; break;
default: return BH_NO_IMPL;
}
if (buffer->at > buffer->size)
buffer->at = buffer->size;
return BH_OK;
}
bh_off_t bh_buffer_size_base(bh_buffer_t *buffer)
{
return buffer->size;
}
bh_off_t bh_buffer_tell_base(bh_buffer_t *buffer)
{
return buffer->at;
}
bh_off_t bh_buffer_available_base(bh_buffer_t *buffer)
{
return buffer->size - buffer->at;
}
void bh_buffer_clear_base(bh_buffer_t *buffer)
{
buffer->base.flags &= ~BH_IO_ERROR;
}
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