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/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "git2/indexer.h"
#include "git2/object.h"
#include "git2/zlib.h"
#include "common.h"
#include "pack.h"
#include "mwindow.h"
#include "posix.h"
struct entry {
unsigned char sha[GIT_OID_RAWSZ];
uint32_t crc;
uint32_t offset;
uint64_t offset_long;
};
typedef struct git_indexer {
struct git_pack_file *pack;
struct stat st;
git_indexer_stats stats;
struct git_pack_header hdr;
struct entry *objects;
} git_indexer;
static int parse_header(git_indexer *idx)
{
int error;
/* Verify we recognize this pack file format. */
if ((error = p_read(idx->pack->mwf.fd, &idx->hdr, sizeof(idx->hdr))) < GIT_SUCCESS)
return git__rethrow(error, "Failed to read in pack header");
if (idx->hdr.hdr_signature != htonl(PACK_SIGNATURE))
return git__throw(GIT_EOBJCORRUPTED, "Wrong pack signature");
if (!pack_version_ok(idx->hdr.hdr_version))
return git__throw(GIT_EOBJCORRUPTED, "Wrong pack version");
return GIT_SUCCESS;
}
int git_indexer_new(git_indexer **out, const char *packname)
{
git_indexer *idx;
unsigned int namelen;
int ret, error;
idx = git__malloc(sizeof(git_indexer));
if (idx == NULL)
return GIT_ENOMEM;
memset(idx, 0x0, sizeof(*idx));
namelen = strlen(packname);
idx->pack = git__malloc(sizeof(struct git_pack_file) + namelen + 1);
if (idx->pack == NULL)
goto cleanup;
memset(idx->pack, 0x0, sizeof(struct git_pack_file));
memcpy(idx->pack->pack_name, packname, namelen);
ret = p_stat(packname, &idx->st);
if (ret < 0) {
if (errno == ENOENT)
error = git__throw(GIT_ENOTFOUND, "Failed to stat packfile. File not found");
else
error = git__throw(GIT_EOSERR, "Failed to stat packfile.");
goto cleanup;
}
ret = p_open(idx->pack->pack_name, O_RDONLY);
if (ret < 0) {
error = git__throw(GIT_EOSERR, "Failed to open packfile");
goto cleanup;
}
idx->pack->mwf.fd = ret;
error = parse_header(idx);
if (error < GIT_SUCCESS) {
error = git__rethrow(error, "Failed to parse packfile header");
goto cleanup;
}
idx->objects = git__calloc(sizeof(struct entry), idx->hdr.hdr_entries);
if (idx->objects == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
idx->stats.total = idx->hdr.hdr_entries;
*out = idx;
return GIT_SUCCESS;
cleanup:
free(idx->pack);
free(idx);
return error;
}
/*
* Create the index. Every time something interesting happens
* (something has been parse or resolved), the callback gets called
* with some stats so it can tell the user how hard we're working
*/
int git_indexer_run(git_indexer *idx, int (*cb)(const git_indexer_stats *, void *), void *cb_data)
{
git_mwindow_file *mwf = &idx->pack->mwf;
off_t off = 0;
int error;
unsigned int fanout[256] = {0};
/* FIXME: Write the keep file */
error = git_mwindow_file_register(mwf);
if (error < GIT_SUCCESS)
return git__rethrow(error, "Failed to register mwindow file");
/* Notify before the first one */
if (cb)
cb(&idx->stats, cb_data);
while (idx->stats.processed < idx->stats.total) {
git_rawobj obj;
git_oid oid;
struct entry entry;
char hdr[512] = {0}; /* FIXME: How long should this be? */
int i, hdr_len;
memset(&entry, 0x0, sizeof(entry)); /* Necessary? */
if (off > UINT31_MAX) {
entry.offset = ~0ULL;
entry.offset_long = off;
} else {
entry.offset = off;
}
error = git_packfile_unpack(&obj, idx->pack, &off);
if (error < GIT_SUCCESS) {
error = git__rethrow(error, "Failed to unpack object");
goto cleanup;
}
error = git_odb__hash_obj(&oid, hdr, sizeof(hdr), &hdr_len, &obj);
if (error < GIT_SUCCESS) {
error = git__rethrow(error, "Failed to hash object");
goto cleanup;
}
memcpy(&entry.sha, oid.id, GIT_OID_RAWSZ);
/* entry.crc = crc32(obj.data) */
/* Add the object to the list */
//memcpy(&idx->objects[idx->stats.processed], &entry, sizeof(entry));
idx->objects[idx->stats.processed] = entry;
for (i = oid.id[0]; i < 256; ++i) {
fanout[i]++;
}
free(obj.data);
idx->stats.processed++;
if (cb)
cb(&idx->stats, cb_data);
}
/*
* All's gone well, so let's write the index file.
*/
cleanup:
git_mwindow_free_all(mwf);
return error;
}
void git_indexer_free(git_indexer *idx)
{
p_close(idx->pack->mwf.fd);
free(idx->objects);
free(idx->pack);
free(idx);
}
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