зеркало из https://github.com/microsoft/git.git
129 строки
2.6 KiB
C
129 строки
2.6 KiB
C
/*
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* csum-file.c
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*
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* Copyright (C) 2005 Linus Torvalds
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*
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* Simple file write infrastructure for writing SHA1-summed
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* files. Useful when you write a file that you want to be
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* able to verify hasn't been messed with afterwards.
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*/
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#include "cache.h"
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#include "progress.h"
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#include "csum-file.h"
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static void flush(struct sha1file *f, void * buf, unsigned int count)
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{
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for (;;) {
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int ret = xwrite(f->fd, buf, count);
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if (ret > 0) {
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f->total += ret;
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display_throughput(f->tp, f->total);
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buf = (char *) buf + ret;
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count -= ret;
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if (count)
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continue;
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return;
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}
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if (!ret)
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die("sha1 file '%s' write error. Out of diskspace", f->name);
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die("sha1 file '%s' write error (%s)", f->name, strerror(errno));
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}
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}
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void sha1flush(struct sha1file *f)
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{
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unsigned offset = f->offset;
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if (offset) {
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git_SHA1_Update(&f->ctx, f->buffer, offset);
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flush(f, f->buffer, offset);
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f->offset = 0;
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}
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}
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int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
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{
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int fd;
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sha1flush(f);
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git_SHA1_Final(f->buffer, &f->ctx);
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if (result)
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hashcpy(result, f->buffer);
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if (flags & (CSUM_CLOSE | CSUM_FSYNC)) {
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/* write checksum and close fd */
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flush(f, f->buffer, 20);
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if (flags & CSUM_FSYNC)
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fsync_or_die(f->fd, f->name);
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if (close(f->fd))
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die("%s: sha1 file error on close (%s)",
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f->name, strerror(errno));
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fd = 0;
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} else
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fd = f->fd;
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free(f);
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return fd;
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}
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int sha1write(struct sha1file *f, void *buf, unsigned int count)
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{
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while (count) {
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unsigned offset = f->offset;
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unsigned left = sizeof(f->buffer) - offset;
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unsigned nr = count > left ? left : count;
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void *data;
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if (f->do_crc)
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f->crc32 = crc32(f->crc32, buf, nr);
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if (nr == sizeof(f->buffer)) {
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/* process full buffer directly without copy */
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data = buf;
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} else {
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memcpy(f->buffer + offset, buf, nr);
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data = f->buffer;
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}
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count -= nr;
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offset += nr;
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buf = (char *) buf + nr;
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left -= nr;
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if (!left) {
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git_SHA1_Update(&f->ctx, data, offset);
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flush(f, data, offset);
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offset = 0;
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}
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f->offset = offset;
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}
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return 0;
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}
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struct sha1file *sha1fd(int fd, const char *name)
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{
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return sha1fd_throughput(fd, name, NULL);
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}
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struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp)
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{
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struct sha1file *f = xmalloc(sizeof(*f));
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f->fd = fd;
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f->offset = 0;
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f->total = 0;
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f->tp = tp;
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f->name = name;
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f->do_crc = 0;
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git_SHA1_Init(&f->ctx);
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return f;
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}
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void crc32_begin(struct sha1file *f)
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{
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f->crc32 = crc32(0, Z_NULL, 0);
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f->do_crc = 1;
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}
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uint32_t crc32_end(struct sha1file *f)
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{
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f->do_crc = 0;
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return f->crc32;
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}
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