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/*
* Copyright (C) 2009-2011 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "tree-cache.h"
static int read_tree_internal(git_tree_cache **out,
const char **buffer_in, const char *buffer_end, git_tree_cache *parent)
{
git_tree_cache *tree;
const char *name_start, *buffer;
int count;
int error = GIT_SUCCESS;
size_t name_len;
buffer = name_start = *buffer_in;
if ((buffer = memchr(buffer, '\0', buffer_end - buffer)) == NULL) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
if (++buffer >= buffer_end) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
name_len = strlen(name_start);
if ((tree = git__malloc(sizeof(git_tree_cache) + name_len + 1)) == NULL)
return GIT_ENOMEM;
memset(tree, 0x0, sizeof(git_tree_cache));
tree->parent = parent;
/* NUL-terminated tree name */
memcpy(tree->name, name_start, name_len);
tree->name[name_len] = '\0';
/* Blank-terminated ASCII decimal number of entries in this tree */
if (git__strtol32(&count, buffer, &buffer, 10) < GIT_SUCCESS || count < -1) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
/* Invalidated TREE. Free the tree but report success */
if (count == -1) {
/* FIXME: return buffer_end or the end position for
* this single tree entry */
*buffer_in = buffer_end;
*out = NULL;
git_tree_cache_free(tree); /* Needs to be done manually */
return GIT_SUCCESS;
}
tree->entries = count;
if (*buffer != ' ' || ++buffer >= buffer_end) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
/* Number of children of the tree, newline-terminated */
if (git__strtol32(&count, buffer, &buffer, 10) < GIT_SUCCESS ||
count < 0) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
tree->children_count = count;
if (*buffer != '\n' || ++buffer >= buffer_end) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
/* 160-bit SHA-1 for this tree and it's children */
if (buffer + GIT_OID_RAWSZ > buffer_end) {
error = GIT_EOBJCORRUPTED;
goto cleanup;
}
git_oid_fromraw(&tree->oid, (const unsigned char *)buffer);
buffer += GIT_OID_RAWSZ;
/* Parse children: */
if (tree->children_count > 0) {
unsigned int i;
int err;
tree->children = git__malloc(tree->children_count * sizeof(git_tree_cache *));
if (tree->children == NULL)
goto cleanup;
for (i = 0; i < tree->children_count; ++i) {
err = read_tree_internal(&tree->children[i], &buffer, buffer_end, tree);
if (err < GIT_SUCCESS)
goto cleanup;
}
}
*buffer_in = buffer;
*out = tree;
return GIT_SUCCESS;
cleanup:
git_tree_cache_free(tree);
return error;
}
int git_tree_cache_read(git_tree_cache **tree, const char *buffer, size_t buffer_size)
{
const char *buffer_end = buffer + buffer_size;
int error;
error = read_tree_internal(tree, &buffer, buffer_end, NULL);
if (buffer < buffer_end)
return GIT_EOBJCORRUPTED;
return error;
}
void git_tree_cache_free(git_tree_cache *tree)
{
unsigned int i;
if (tree == NULL)
return;
for (i = 0; i < tree->children_count; ++i)
git_tree_cache_free(tree->children[i]);
free(tree->children);
free(tree);
}
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