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Improve write time by using a byte lookup table #51

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Improve write time by using a byte lookup table #51

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23 changes: 15 additions & 8 deletions src/πfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,7 @@ static int pifs_read(const char *path, char *buf, size_t count, off_t offset,
return count;
}

static unsigned short bytesIndices[256] = {0};
static int pifs_write(const char *path, const char *buf, size_t count,
off_t offset, struct fuse_file_info *info)
{
Expand All @@ -185,13 +186,7 @@ static int pifs_write(const char *path, const char *buf, size_t count,
}

for (size_t i = 0; i < count; i++) {
short index;
for (index = 0; index < SHRT_MAX; index++) {
if (get_byte(index) == *buf) {
break;
}
}
ret = write(info->fh, &index, sizeof index);
ret = write(info->fh, &bytesIndices[(unsigned char)*buf], sizeof(unsigned short));
if (ret == -1) {
return -errno;
}
Expand Down Expand Up @@ -271,7 +266,7 @@ static int pifs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
do {
errno = 0;
struct dirent *de = readdir(dir);
if (!de) {
if (!de) {
if (errno) {
return -errno;
} else {
Expand Down Expand Up @@ -390,6 +385,18 @@ static struct fuse_operations pifs_ops = {

int main (int argc, char *argv[])
{
int found = 0;
for(unsigned short i = 1; i < USHRT_MAX; i++)
{
unsigned char val = get_byte(i);
if(bytesIndices[val] == 0)
{
bytesIndices[val] = i;
if(++found == 256)
break;
}
}

int ret;
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);

Expand Down