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#include "fileops.h"
int gitfo_read(git_file fd, void *buf, size_t cnt)
{
char *b = buf;
while (cnt) {
ssize_t r = read(fd, b, cnt);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if (!r) {
errno = EPIPE;
return -1;
}
cnt -= r;
b += r;
}
return GIT_SUCCESS;
}
int gitfo_write(git_file fd, void *buf, size_t cnt)
{
char *b = buf;
while (cnt) {
ssize_t r = write(fd, b, cnt);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if (!r) {
errno = EPIPE;
return -1;
}
cnt -= r;
b += r;
}
return GIT_SUCCESS;
}
off_t gitfo_size(git_file fd)
{
gitfo_statbuf sb;
if (fstat(fd, &sb))
return -1;
return sb.st_size;
}
/* cached diskio */
struct gitfo_cache {
git_file fd;
unsigned int cache_size, pos;
void *cache;
};
gitfo_cache *gitfo_enable_caching(git_file fd, size_t cache_size)
{
gitfo_cache *ioc;
ioc = malloc(sizeof(*ioc));
if (!ioc)
return NULL;
ioc->pos = 0;
ioc->cache_size = cache_size;
ioc->cache = malloc(cache_size);
if (!ioc->cache) {
free(ioc);
return NULL;
}
return ioc;
}
static inline void gitfo_add_to_cache(gitfo_cache *ioc, void *buf, size_t len)
{
memcpy(ioc->cache + ioc->pos, buf, len);
ioc->pos += len;
}
int gitfo_flush_cached(gitfo_cache *ioc)
{
int result = GIT_SUCCESS;
if (ioc->pos) {
result = gitfo_write(ioc->fd, ioc->cache, ioc->pos);
ioc->pos = 0;
}
return result;
}
int gitfo_write_cached(gitfo_cache *ioc, void *buf, size_t len)
{
for (;;) {
size_t space_left = ioc->cache_size - ioc->pos;
/* cache if it's small */
if (space_left > len) {
gitfo_add_to_cache(ioc, buf, len);
return GIT_SUCCESS;
}
/* flush the cache if it doesn't fit */
if (ioc->pos) {
int rc;
gitfo_add_to_cache(ioc, buf, space_left);
rc = gitfo_flush_cached(ioc);
if (rc < 0)
return rc;
len -= space_left;
buf += space_left;
}
/* write too-large chunks immediately */
if (len > ioc->cache_size)
return gitfo_write(ioc->fd, buf, len);
}
return GIT_SUCCESS;
}
int gitfo_close_cached(gitfo_cache *ioc)
{
git_file fd;
if (gitfo_flush_cached(ioc) < 0)
return -1;
fd = ioc->fd;
free(ioc->cache);
free(ioc);
return gitfo_close(fd);
}
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