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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* blob.c: Blob support by Yasuhiro Matsumoto
*/
#include "vim.h"
#if defined(FEAT_EVAL) || defined(PROTO)
/*
* Allocate an empty blob.
* Caller should take care of the reference count.
*/
blob_T *
blob_alloc(void)
{
blob_T *blob = (blob_T *)alloc_clear(sizeof(blob_T));
if (blob != NULL)
ga_init2(&blob->bv_ga, 1, 100);
return blob;
}
/*
* Allocate an empty blob for a return value, with reference count set.
* Returns OK or FAIL.
*/
int
rettv_blob_alloc(typval_T *rettv)
{
blob_T *b = blob_alloc();
if (b == NULL)
return FAIL;
rettv_blob_set(rettv, b);
return OK;
}
/*
* Set a blob as the return value.
*/
void
rettv_blob_set(typval_T *rettv, blob_T *b)
{
rettv->v_type = VAR_BLOB;
rettv->vval.v_blob = b;
if (b != NULL)
++b->bv_refcount;
}
void
blob_free(blob_T *b)
{
ga_clear(&b->bv_ga);
vim_free(b);
}
/*
* Unreference a blob: decrement the reference count and free it when it
* becomes zero.
*/
void
blob_unref(blob_T *b)
{
if (b != NULL && --b->bv_refcount <= 0)
blob_free(b);
}
/*
* Get the length of data.
*/
long
blob_len(blob_T *b)
{
if (b == NULL)
return 0L;
return b->bv_ga.ga_len;
}
/*
* Get byte "idx" in blob "b".
* Caller must check that "idx" is valid.
*/
char_u
blob_get(blob_T *b, int idx)
{
return ((char_u*)b->bv_ga.ga_data)[idx];
}
/*
* Store one byte "c" in blob "b" at "idx".
* Caller must make sure that "idx" is valid.
*/
void
blob_set(blob_T *b, int idx, char_u c)
{
((char_u*)b->bv_ga.ga_data)[idx] = c;
}
/*
* Return TRUE when two blobs have exactly the same values.
*/
int
blob_equal(
blob_T *b1,
blob_T *b2)
{
int i;
if (b1 == NULL || b2 == NULL)
return FALSE;
if (b1 == b2)
return TRUE;
if (blob_len(b1) != blob_len(b2))
return FALSE;
for (i = 0; i < b1->bv_ga.ga_len; i++)
if (blob_get(b1, i) != blob_get(b2, i)) return FALSE;
return TRUE;
}
/*
* Read "blob" from file "fd".
* Return OK or FAIL.
*/
int
read_blob(FILE *fd, blob_T *blob)
{
struct stat st;
if (fstat(fileno(fd), &st) < 0)
return FAIL;
if (ga_grow(&blob->bv_ga, st.st_size) == FAIL)
return FAIL;
blob->bv_ga.ga_len = st.st_size;
if (fread(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
< (size_t)blob->bv_ga.ga_len)
return FAIL;
return OK;
}
/*
* Write "blob" to file "fd".
* Return OK or FAIL.
*/
int
write_blob(FILE *fd, blob_T *blob)
{
if (fwrite(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
< (size_t)blob->bv_ga.ga_len)
{
EMSG(_(e_write));
return FAIL;
}
return OK;
}
#endif /* defined(FEAT_EVAL) */
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