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[read performance iterate] peek-file-reader v2

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This commit is contained in:
John Kerl 2015-09-05 23:00:24 -04:00
parent 721cd0264e
commit 54ea039b03
2 changed files with 13 additions and 5 deletions
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16
c/input/peek_file_reader.c
View file

@ -23,15 +23,23 @@ peek_file_reader_t* pfr_alloc(byte_reader_t* pbr, int maxnpeek) {
}
void pfr_free(peek_file_reader_t* pfr) {
// xxx stub
if (pfr == NULL)
return;
free(pfr->peekbuf);
free(pfr);
}
char* pfr_peek_char(peek_file_reader_t* pfr) {
return NULL; // xxx stub
char pfr_peek_char(peek_file_reader_t* pfr) {
if (pfr->npeeked < 1) {
pfr->peekbuf[pfr->npeeked++] = pfr->pbr->pread_func(pfr->pbr);
}
return pfr->peekbuf[0];
}
void pfr_buffer_by(peek_file_reader_t* pfr, int len) {
// xxx stub
while (pfr->npeeked < len) {
pfr->peekbuf[pfr->npeeked++] = pfr->pbr->pread_func(pfr->pbr);
}
}
void pfr_advance_by(peek_file_reader_t* pfr, int len) {

2
c/input/peek_file_reader.h
View file

@ -19,7 +19,7 @@ typedef struct _peek_file_reader_t {
peek_file_reader_t* pfr_alloc(byte_reader_t* pbr, int maxnpeek);
void pfr_free(peek_file_reader_t* pfr);
char* pfr_peek_char(peek_file_reader_t* pfr);
char pfr_peek_char(peek_file_reader_t* pfr);
void pfr_buffer_by(peek_file_reader_t* pfr, int len);
void pfr_advance_by(peek_file_reader_t* pfr, int len);