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7ba502c47b
To keep things well layered, sha1close() now returns the file descriptor when it doesn't close the file. An ugly cast was added to the return of write_idx_file() to avoid a warning. A proper fix will come separately. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
113 lines
2.2 KiB
C
113 lines
2.2 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 "csum-file.h"
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static void sha1flush(struct sha1file *f, unsigned int count)
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{
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void *buf = f->buffer;
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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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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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int sha1close(struct sha1file *f, unsigned char *result, int final)
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{
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int fd;
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unsigned offset = f->offset;
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if (offset) {
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SHA1_Update(&f->ctx, f->buffer, offset);
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sha1flush(f, offset);
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f->offset = 0;
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}
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if (final) {
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/* write checksum and close fd */
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SHA1_Final(f->buffer, &f->ctx);
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if (result)
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hashcpy(result, f->buffer);
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sha1flush(f, 20);
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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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if (f->do_crc)
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f->crc32 = crc32(f->crc32, buf, count);
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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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memcpy(f->buffer + offset, buf, nr);
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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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SHA1_Update(&f->ctx, f->buffer, offset);
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sha1flush(f, 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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struct sha1file *f;
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unsigned len;
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f = xmalloc(sizeof(*f));
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len = strlen(name);
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if (len >= PATH_MAX)
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die("you wascally wabbit, you");
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f->namelen = len;
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memcpy(f->name, name, len+1);
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f->fd = fd;
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f->error = 0;
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f->offset = 0;
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f->do_crc = 0;
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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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