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authorDan McGee <dan@archlinux.org>2010-12-29 18:43:44 -0600
committerDan McGee <dan@archlinux.org>2010-12-29 18:43:44 -0600
commita58083459b096e935693d94b9cb51a447b3a1abd (patch)
treee21857a8cc0b3dbe562cfe015571280c41023729 /lib/libalpm/util.c
parent126f50ab0b5ee3ed46c5a6ecae241e8af49b0fe2 (diff)
parente3c19569cfe7cd77674490b30624e71512417e0b (diff)
Merge branch 'fgets-perf'
Diffstat (limited to 'lib/libalpm/util.c')
-rw-r--r--lib/libalpm/util.c100
1 files changed, 78 insertions, 22 deletions
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 1291ea0f..d34eab5e 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -771,33 +771,89 @@ int _alpm_test_md5sum(const char *filepath, const char *md5sum)
return(ret);
}
-char *_alpm_archive_fgets(char *line, size_t size, struct archive *a)
+/* Note: does NOT handle sparse files on purpose for speed. */
+int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
{
- /* for now, just read one char at a time until we get to a
- * '\n' char. we can optimize this later with an internal
- * buffer. */
- /* leave room for zero terminator */
- char *last = line + size - 1;
- char *i;
-
- for(i = line; i < last; i++) {
- int ret = archive_read_data(a, i, 1);
- /* special check for first read- if null, return null,
- * this indicates EOF */
- if(i == line && (ret <= 0 || *i == '\0')) {
- return(NULL);
+ char *i = NULL;
+ int64_t offset;
+ int done = 0;
+
+ while(1) {
+ /* have we processed this entire block? */
+ if(b->block + b->block_size == b->block_offset) {
+ if(b->ret == ARCHIVE_EOF) {
+ /* reached end of archive on the last read, now we are out of data */
+ goto cleanup;
+ }
+
+ /* zero-copy - this is the entire next block of data. */
+ b->ret = archive_read_data_block(a, (void*)&b->block,
+ &b->block_size, &offset);
+ b->block_offset = b->block;
+
+ /* error or end of archive with no data read, cleanup */
+ if(b->ret < ARCHIVE_OK ||
+ (b->block_size == 0 && b->ret == ARCHIVE_EOF)) {
+ goto cleanup;
+ }
}
- /* check if read value was null or newline */
- if(ret <= 0 || *i == '\0' || *i == '\n') {
- last = i + 1;
- break;
+
+ /* loop through the block looking for EOL characters */
+ for(i = b->block_offset; i < (b->block + b->block_size); i++) {
+ /* check if read value was null or newline */
+ if(*i == '\0' || *i == '\n') {
+ done = 1;
+ break;
+ }
}
- }
- /* always null terminate the buffer */
- *last = '\0';
+ /* allocate our buffer, or ensure our existing one is big enough */
+ if(!b->line) {
+ /* set the initial buffer to the read block_size */
+ CALLOC(b->line, b->block_size + 1, sizeof(char),
+ RET_ERR(PM_ERR_MEMORY, -1));
+ b->line_size = b->block_size + 1;
+ b->line_offset = b->line;
+ } else {
+ size_t needed = (b->line_offset - b->line) + (i - b->block_offset) + 1;
+ if(needed > b->max_line_size) {
+ RET_ERR(PM_ERR_MEMORY, -1);
+ }
+ if(needed > b->line_size) {
+ /* need to realloc + copy data to fit total length */
+ char *new;
+ CALLOC(new, needed, sizeof(char), RET_ERR(PM_ERR_MEMORY, -1));
+ memcpy(new, b->line, b->line_size);
+ b->line_size = needed;
+ b->line_offset = new + (b->line_offset - b->line);
+ free(b->line);
+ b->line = new;
+ }
+ }
+
+ if(done) {
+ size_t len = i - b->block_offset;
+ memcpy(b->line_offset, b->block_offset, len);
+ b->line_offset[len] = '\0';
+ b->block_offset = ++i;
+ /* this is the main return point; from here you can read b->line */
+ return(ARCHIVE_OK);
+ } else {
+ /* we've looked through the whole block but no newline, copy it */
+ size_t len = b->block + b->block_size - b->block_offset;
+ memcpy(b->line_offset, b->block_offset, len);
+ b->line_offset += len;
+ b->block_offset = i;
+ }
+ }
- return(line);
+cleanup:
+ {
+ int ret = b->ret;
+ FREE(b->line);
+ memset(b, 0, sizeof(b));
+ return(ret);
+ }
}
int _alpm_splitname(const char *target, pmpkg_t *pkg)