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/* * 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 sha1file *f, void * buf, unsigned int count) { 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 sha1flush(struct sha1file *f) { unsigned offset = f->offset; if (offset) { git_SHA1_Update(&f->ctx, f->buffer, offset); flush(f, f->buffer, offset); f->offset = 0; } } int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags) { int fd; sha1flush(f); git_SHA1_Final(f->buffer, &f->ctx); if (result) hashcpy(result, f->buffer); if (flags & (CSUM_CLOSE | CSUM_FSYNC)) { /* write checksum and close fd */ flush(f, f->buffer, 20); if (flags & CSUM_FSYNC) fsync_or_die(f->fd, f->name); if (close(f->fd)) die_errno("%s: sha1 file error on close", f->name); fd = 0; } else fd = f->fd; free(f); return fd; } int sha1write(struct sha1file *f, void *buf, unsigned int count) { while (count) { unsigned offset = f->offset; unsigned left = sizeof(f->buffer) - offset; unsigned nr = count > left ? left : count; 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) { git_SHA1_Update(&f->ctx, data, offset); flush(f, data, offset); offset = 0; } f->offset = offset; } return 0; } struct sha1file *sha1fd(int fd, const char *name) { return sha1fd_throughput(fd, name, NULL); } struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp) { struct sha1file *f = xmalloc(sizeof(*f)); f->fd = fd; f->offset = 0; f->total = 0; f->tp = tp; f->name = name; f->do_crc = 0; git_SHA1_Init(&f->ctx); return f; } void crc32_begin(struct sha1file *f) { f->crc32 = crc32(0, Z_NULL, 0); f->do_crc = 1; } uint32_t crc32_end(struct sha1file *f) { f->do_crc = 0; return f->crc32; }
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