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205166d27c
Add git_status_hashfile() to get blob's object id for a file without adding it to the object database or needing a repository at all. This functionality is similar to `git hash-object` without '-w'.
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2,
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* as published by the Free Software Foundation.
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*
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* In addition to the permissions in the GNU General Public License,
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* the authors give you unlimited permission to link the compiled
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* version of this file into combinations with other programs,
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* and to distribute those combinations without any restriction
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* coming from the use of this file. (The General Public License
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* restrictions do apply in other respects; for example, they cover
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* modification of the file, and distribution when not linked into
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* a combined executable.)
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "common.h"
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#include "git2.h"
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#include "fileops.h"
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#include "hash.h"
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int git_status_hashfile(git_oid *out, const char *path)
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{
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int fd, len;
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char hdr[64], buffer[2048];
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git_off_t size;
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git_hash_ctx *ctx;
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if ((fd = p_open(path, O_RDONLY)) < 0)
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return git__throw(GIT_ENOTFOUND, "Could not open '%s'", path);
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if ((size = git_futils_filesize(fd)) < 0 || !git__is_sizet(size)) {
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p_close(fd);
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return git__throw(GIT_EOSERR, "'%s' appears to be corrupted", path);
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}
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ctx = git_hash_new_ctx();
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len = snprintf(hdr, sizeof(hdr), "blob %"PRIuZ, (size_t)size);
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assert(len > 0);
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assert(((size_t) len) < sizeof(hdr));
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if (len < 0 || ((size_t) len) >= sizeof(hdr))
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return git__throw(GIT_ERROR, "Failed to format blob header. Length is out of bounds");
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git_hash_update(ctx, hdr, len+1);
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while (size > 0) {
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ssize_t read_len;
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read_len = read(fd, buffer, sizeof(buffer));
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if (read_len < 0) {
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p_close(fd);
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git_hash_free_ctx(ctx);
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return git__throw(GIT_EOSERR, "Can't read full file '%s'", path);
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}
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git_hash_update(ctx, buffer, read_len);
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size -= read_len;
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}
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p_close(fd);
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git_hash_final(out, ctx);
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git_hash_free_ctx(ctx);
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return GIT_SUCCESS;
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}
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