diff options
Diffstat (limited to 'third_party/git/csum-file.c')
| -rw-r--r-- | third_party/git/csum-file.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/third_party/git/csum-file.c b/third_party/git/csum-file.c deleted file mode 100644 index 0f35fa5ee47c..000000000000 --- a/third_party/git/csum-file.c +++ /dev/null @@ -1,186 +0,0 @@ -/* - * csum-file.c - * - * Copyright (C) 2005 Linus Torvalds - * - * Simple file write infrastructure for writing SHA1-summed - * files. Useful when you write a file that you want to be - * able to verify hasn't been messed with afterwards. - */ -#include "cache.h" -#include "progress.h" -#include "csum-file.h" - -static void flush(struct hashfile *f, const void *buf, unsigned int count) -{ - if (0 <= f->check_fd && count) { - unsigned char check_buffer[8192]; - ssize_t ret = read_in_full(f->check_fd, check_buffer, count); - - if (ret < 0) - die_errno("%s: sha1 file read error", f->name); - if (ret != count) - die("%s: sha1 file truncated", f->name); - if (memcmp(buf, check_buffer, count)) - die("sha1 file '%s' validation error", f->name); - } - - for (;;) { - int ret = xwrite(f->fd, buf, count); - if (ret > 0) { - f->total += ret; - display_throughput(f->tp, f->total); - buf = (char *) buf + ret; - count -= ret; - if (count) - continue; - return; - } - if (!ret) - die("sha1 file '%s' write error. Out of diskspace", f->name); - die_errno("sha1 file '%s' write error", f->name); - } -} - -void hashflush(struct hashfile *f) -{ - unsigned offset = f->offset; - - if (offset) { - the_hash_algo->update_fn(&f->ctx, f->buffer, offset); - flush(f, f->buffer, offset); - f->offset = 0; - } -} - -int finalize_hashfile(struct hashfile *f, unsigned char *result, unsigned int flags) -{ - int fd; - - hashflush(f); - the_hash_algo->final_fn(f->buffer, &f->ctx); - if (result) - hashcpy(result, f->buffer); - if (flags & CSUM_HASH_IN_STREAM) - flush(f, f->buffer, the_hash_algo->rawsz); - if (flags & CSUM_FSYNC) - fsync_or_die(f->fd, f->name); - if (flags & CSUM_CLOSE) { - if (close(f->fd)) - die_errno("%s: sha1 file error on close", f->name); - fd = 0; - } else - fd = f->fd; - if (0 <= f->check_fd) { - char discard; - int cnt = read_in_full(f->check_fd, &discard, 1); - if (cnt < 0) - die_errno("%s: error when reading the tail of sha1 file", - f->name); - if (cnt) - die("%s: sha1 file has trailing garbage", f->name); - if (close(f->check_fd)) - die_errno("%s: sha1 file error on close", f->name); - } - free(f); - return fd; -} - -void hashwrite(struct hashfile *f, const void *buf, unsigned int count) -{ - while (count) { - unsigned offset = f->offset; - unsigned left = sizeof(f->buffer) - offset; - unsigned nr = count > left ? left : count; - const void *data; - - if (f->do_crc) - f->crc32 = crc32(f->crc32, buf, nr); - - if (nr == sizeof(f->buffer)) { - /* process full buffer directly without copy */ - data = buf; - } else { - memcpy(f->buffer + offset, buf, nr); - data = f->buffer; - } - - count -= nr; - offset += nr; - buf = (char *) buf + nr; - left -= nr; - if (!left) { - the_hash_algo->update_fn(&f->ctx, data, offset); - flush(f, data, offset); - offset = 0; - } - f->offset = offset; - } -} - -struct hashfile *hashfd(int fd, const char *name) -{ - return hashfd_throughput(fd, name, NULL); -} - -struct hashfile *hashfd_check(const char *name) -{ - int sink, check; - struct hashfile *f; - - sink = open("/dev/null", O_WRONLY); - if (sink < 0) - die_errno("unable to open /dev/null"); - check = open(name, O_RDONLY); - if (check < 0) - die_errno("unable to open '%s'", name); - f = hashfd(sink, name); - f->check_fd = check; - return f; -} - -struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp) -{ - struct hashfile *f = xmalloc(sizeof(*f)); - f->fd = fd; - f->check_fd = -1; - f->offset = 0; - f->total = 0; - f->tp = tp; - f->name = name; - f->do_crc = 0; - the_hash_algo->init_fn(&f->ctx); - return f; -} - -void hashfile_checkpoint(struct hashfile *f, struct hashfile_checkpoint *checkpoint) -{ - hashflush(f); - checkpoint->offset = f->total; - the_hash_algo->clone_fn(&checkpoint->ctx, &f->ctx); -} - -int hashfile_truncate(struct hashfile *f, struct hashfile_checkpoint *checkpoint) -{ - off_t offset = checkpoint->offset; - - if (ftruncate(f->fd, offset) || - lseek(f->fd, offset, SEEK_SET) != offset) - return -1; - f->total = offset; - f->ctx = checkpoint->ctx; - f->offset = 0; /* hashflush() was called in checkpoint */ - return 0; -} - -void crc32_begin(struct hashfile *f) -{ - f->crc32 = crc32(0, NULL, 0); - f->do_crc = 1; -} - -uint32_t crc32_end(struct hashfile *f) -{ - f->do_crc = 0; - return f->crc32; -} |