mirror of
https://github.com/git/git.git
synced 2024-12-05 07:53:59 +08:00
a09a0c2709
* jk/maint-avoid-streaming-filtered-contents: do not stream large files to pack when filters are in use teach dry-run convert_to_git not to require a src buffer teach convert_to_git a "dry run" mode
1325 lines
30 KiB
C
1325 lines
30 KiB
C
#include "cache.h"
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#include "attr.h"
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#include "run-command.h"
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#include "quote.h"
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#include "sigchain.h"
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/*
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* convert.c - convert a file when checking it out and checking it in.
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*
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* This should use the pathname to decide on whether it wants to do some
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* more interesting conversions (automatic gzip/unzip, general format
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* conversions etc etc), but by default it just does automatic CRLF<->LF
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* translation when the "text" attribute or "auto_crlf" option is set.
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*/
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enum crlf_action {
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CRLF_GUESS = -1,
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CRLF_BINARY = 0,
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CRLF_TEXT,
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CRLF_INPUT,
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CRLF_CRLF,
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CRLF_AUTO
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};
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struct text_stat {
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/* NUL, CR, LF and CRLF counts */
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unsigned nul, cr, lf, crlf;
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/* These are just approximations! */
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unsigned printable, nonprintable;
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};
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static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
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{
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unsigned long i;
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memset(stats, 0, sizeof(*stats));
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for (i = 0; i < size; i++) {
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unsigned char c = buf[i];
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if (c == '\r') {
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stats->cr++;
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if (i+1 < size && buf[i+1] == '\n')
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stats->crlf++;
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continue;
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}
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if (c == '\n') {
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stats->lf++;
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continue;
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}
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if (c == 127)
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/* DEL */
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stats->nonprintable++;
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else if (c < 32) {
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switch (c) {
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/* BS, HT, ESC and FF */
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case '\b': case '\t': case '\033': case '\014':
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stats->printable++;
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break;
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case 0:
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stats->nul++;
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/* fall through */
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default:
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stats->nonprintable++;
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}
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}
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else
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stats->printable++;
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}
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/* If file ends with EOF then don't count this EOF as non-printable. */
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if (size >= 1 && buf[size-1] == '\032')
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stats->nonprintable--;
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}
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/*
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* The same heuristics as diff.c::mmfile_is_binary()
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*/
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static int is_binary(unsigned long size, struct text_stat *stats)
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{
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if (stats->nul)
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return 1;
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if ((stats->printable >> 7) < stats->nonprintable)
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return 1;
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/*
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* Other heuristics? Average line length might be relevant,
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* as might LF vs CR vs CRLF counts..
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*
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* NOTE! It might be normal to have a low ratio of CRLF to LF
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* (somebody starts with a LF-only file and edits it with an editor
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* that adds CRLF only to lines that are added..). But do we
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* want to support CR-only? Probably not.
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*/
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return 0;
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}
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static enum eol output_eol(enum crlf_action crlf_action)
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{
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switch (crlf_action) {
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case CRLF_BINARY:
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return EOL_UNSET;
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case CRLF_CRLF:
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return EOL_CRLF;
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case CRLF_INPUT:
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return EOL_LF;
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case CRLF_GUESS:
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if (!auto_crlf)
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return EOL_UNSET;
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/* fall through */
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case CRLF_TEXT:
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case CRLF_AUTO:
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if (auto_crlf == AUTO_CRLF_TRUE)
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return EOL_CRLF;
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else if (auto_crlf == AUTO_CRLF_INPUT)
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return EOL_LF;
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else if (core_eol == EOL_UNSET)
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return EOL_NATIVE;
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}
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return core_eol;
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}
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static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
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struct text_stat *stats, enum safe_crlf checksafe)
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{
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if (!checksafe)
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return;
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if (output_eol(crlf_action) == EOL_LF) {
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/*
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* CRLFs would not be restored by checkout:
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* check if we'd remove CRLFs
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*/
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if (stats->crlf) {
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if (checksafe == SAFE_CRLF_WARN)
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warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
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else /* i.e. SAFE_CRLF_FAIL */
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die("CRLF would be replaced by LF in %s.", path);
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}
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} else if (output_eol(crlf_action) == EOL_CRLF) {
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/*
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* CRLFs would be added by checkout:
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* check if we have "naked" LFs
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*/
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if (stats->lf != stats->crlf) {
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if (checksafe == SAFE_CRLF_WARN)
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warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
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else /* i.e. SAFE_CRLF_FAIL */
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die("LF would be replaced by CRLF in %s", path);
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}
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}
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}
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static int has_cr_in_index(const char *path)
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{
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int pos, len;
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unsigned long sz;
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enum object_type type;
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void *data;
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int has_cr;
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struct index_state *istate = &the_index;
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len = strlen(path);
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pos = index_name_pos(istate, path, len);
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if (pos < 0) {
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/*
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* We might be in the middle of a merge, in which
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* case we would read stage #2 (ours).
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*/
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int i;
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for (i = -pos - 1;
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(pos < 0 && i < istate->cache_nr &&
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!strcmp(istate->cache[i]->name, path));
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i++)
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if (ce_stage(istate->cache[i]) == 2)
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pos = i;
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}
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if (pos < 0)
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return 0;
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data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
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if (!data || type != OBJ_BLOB) {
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free(data);
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return 0;
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}
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has_cr = memchr(data, '\r', sz) != NULL;
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free(data);
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return has_cr;
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}
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static int crlf_to_git(const char *path, const char *src, size_t len,
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struct strbuf *buf,
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enum crlf_action crlf_action, enum safe_crlf checksafe)
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{
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struct text_stat stats;
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char *dst;
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if (crlf_action == CRLF_BINARY ||
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(crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) ||
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(src && !len))
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return 0;
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/*
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* If we are doing a dry-run and have no source buffer, there is
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* nothing to analyze; we must assume we would convert.
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*/
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if (!buf && !src)
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return 1;
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gather_stats(src, len, &stats);
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
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/*
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* We're currently not going to even try to convert stuff
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* that has bare CR characters. Does anybody do that crazy
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* stuff?
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*/
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if (stats.cr != stats.crlf)
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return 0;
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/*
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* And add some heuristics for binary vs text, of course...
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*/
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if (is_binary(len, &stats))
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return 0;
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if (crlf_action == CRLF_GUESS) {
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/*
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* If the file in the index has any CR in it, do not convert.
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* This is the new safer autocrlf handling.
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*/
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if (has_cr_in_index(path))
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return 0;
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}
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}
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check_safe_crlf(path, crlf_action, &stats, checksafe);
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/* Optimization: No CR? Nothing to convert, regardless. */
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if (!stats.cr)
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return 0;
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/*
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* At this point all of our source analysis is done, and we are sure we
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* would convert. If we are in dry-run mode, we can give an answer.
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*/
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if (!buf)
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return 1;
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/* only grow if not in place */
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if (strbuf_avail(buf) + buf->len < len)
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strbuf_grow(buf, len - buf->len);
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dst = buf->buf;
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
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/*
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* If we guessed, we already know we rejected a file with
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* lone CR, and we can strip a CR without looking at what
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* follow it.
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*/
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do {
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unsigned char c = *src++;
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if (c != '\r')
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*dst++ = c;
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} while (--len);
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} else {
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do {
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unsigned char c = *src++;
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if (! (c == '\r' && (1 < len && *src == '\n')))
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*dst++ = c;
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} while (--len);
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}
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strbuf_setlen(buf, dst - buf->buf);
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return 1;
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}
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static int crlf_to_worktree(const char *path, const char *src, size_t len,
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struct strbuf *buf, enum crlf_action crlf_action)
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{
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char *to_free = NULL;
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struct text_stat stats;
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if (!len || output_eol(crlf_action) != EOL_CRLF)
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return 0;
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gather_stats(src, len, &stats);
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/* No LF? Nothing to convert, regardless. */
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if (!stats.lf)
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return 0;
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/* Was it already in CRLF format? */
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if (stats.lf == stats.crlf)
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return 0;
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
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if (crlf_action == CRLF_GUESS) {
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/* If we have any CR or CRLF line endings, we do not touch it */
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/* This is the new safer autocrlf-handling */
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if (stats.cr > 0 || stats.crlf > 0)
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return 0;
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}
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/* If we have any bare CR characters, we're not going to touch it */
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if (stats.cr != stats.crlf)
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return 0;
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if (is_binary(len, &stats))
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return 0;
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}
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/* are we "faking" in place editing ? */
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if (src == buf->buf)
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to_free = strbuf_detach(buf, NULL);
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strbuf_grow(buf, len + stats.lf - stats.crlf);
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for (;;) {
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const char *nl = memchr(src, '\n', len);
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if (!nl)
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break;
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if (nl > src && nl[-1] == '\r') {
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strbuf_add(buf, src, nl + 1 - src);
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} else {
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strbuf_add(buf, src, nl - src);
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strbuf_addstr(buf, "\r\n");
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}
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len -= nl + 1 - src;
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src = nl + 1;
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}
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strbuf_add(buf, src, len);
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free(to_free);
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return 1;
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}
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struct filter_params {
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const char *src;
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unsigned long size;
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const char *cmd;
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const char *path;
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};
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static int filter_buffer(int in, int out, void *data)
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{
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/*
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* Spawn cmd and feed the buffer contents through its stdin.
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*/
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struct child_process child_process;
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struct filter_params *params = (struct filter_params *)data;
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int write_err, status;
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const char *argv[] = { NULL, NULL };
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/* apply % substitution to cmd */
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struct strbuf cmd = STRBUF_INIT;
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struct strbuf path = STRBUF_INIT;
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struct strbuf_expand_dict_entry dict[] = {
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{ "f", NULL, },
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{ NULL, NULL, },
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};
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/* quote the path to preserve spaces, etc. */
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sq_quote_buf(&path, params->path);
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dict[0].value = path.buf;
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/* expand all %f with the quoted path */
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strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
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strbuf_release(&path);
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argv[0] = cmd.buf;
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memset(&child_process, 0, sizeof(child_process));
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child_process.argv = argv;
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child_process.use_shell = 1;
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child_process.in = -1;
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child_process.out = out;
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if (start_command(&child_process))
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return error("cannot fork to run external filter %s", params->cmd);
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sigchain_push(SIGPIPE, SIG_IGN);
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write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
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if (close(child_process.in))
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write_err = 1;
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if (write_err)
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error("cannot feed the input to external filter %s", params->cmd);
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sigchain_pop(SIGPIPE);
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status = finish_command(&child_process);
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if (status)
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error("external filter %s failed %d", params->cmd, status);
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strbuf_release(&cmd);
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return (write_err || status);
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}
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static int apply_filter(const char *path, const char *src, size_t len,
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struct strbuf *dst, const char *cmd)
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{
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/*
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* Create a pipeline to have the command filter the buffer's
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* contents.
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*
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* (child --> cmd) --> us
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*/
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int ret = 1;
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struct strbuf nbuf = STRBUF_INIT;
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struct async async;
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struct filter_params params;
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if (!cmd)
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return 0;
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if (!dst)
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return 1;
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memset(&async, 0, sizeof(async));
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async.proc = filter_buffer;
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async.data = ¶ms;
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async.out = -1;
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params.src = src;
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params.size = len;
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params.cmd = cmd;
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params.path = path;
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fflush(NULL);
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if (start_async(&async))
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return 0; /* error was already reported */
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if (strbuf_read(&nbuf, async.out, len) < 0) {
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error("read from external filter %s failed", cmd);
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ret = 0;
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}
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if (close(async.out)) {
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error("read from external filter %s failed", cmd);
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ret = 0;
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}
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if (finish_async(&async)) {
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error("external filter %s failed", cmd);
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ret = 0;
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}
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if (ret) {
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strbuf_swap(dst, &nbuf);
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}
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strbuf_release(&nbuf);
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return ret;
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}
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static struct convert_driver {
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const char *name;
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struct convert_driver *next;
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const char *smudge;
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const char *clean;
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int required;
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} *user_convert, **user_convert_tail;
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static int read_convert_config(const char *var, const char *value, void *cb)
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{
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const char *ep, *name;
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int namelen;
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struct convert_driver *drv;
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/*
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* External conversion drivers are configured using
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* "filter.<name>.variable".
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*/
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if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
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return 0;
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name = var + 7;
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namelen = ep - name;
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for (drv = user_convert; drv; drv = drv->next)
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if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
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break;
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if (!drv) {
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drv = xcalloc(1, sizeof(struct convert_driver));
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drv->name = xmemdupz(name, namelen);
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*user_convert_tail = drv;
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user_convert_tail = &(drv->next);
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}
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ep++;
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/*
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* filter.<name>.smudge and filter.<name>.clean specifies
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* the command line:
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*
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* command-line
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*
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* The command-line will not be interpolated in any way.
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*/
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if (!strcmp("smudge", ep))
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return git_config_string(&drv->smudge, var, value);
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if (!strcmp("clean", ep))
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return git_config_string(&drv->clean, var, value);
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if (!strcmp("required", ep)) {
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drv->required = git_config_bool(var, value);
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return 0;
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}
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return 0;
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}
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static int count_ident(const char *cp, unsigned long size)
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{
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/*
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|
* "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
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*/
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int cnt = 0;
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char ch;
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while (size) {
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ch = *cp++;
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size--;
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if (ch != '$')
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continue;
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if (size < 3)
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break;
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if (memcmp("Id", cp, 2))
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continue;
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ch = cp[2];
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cp += 3;
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size -= 3;
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if (ch == '$')
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cnt++; /* $Id$ */
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if (ch != ':')
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continue;
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/*
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* "$Id: ... "; scan up to the closing dollar sign and discard.
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*/
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while (size) {
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ch = *cp++;
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size--;
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if (ch == '$') {
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cnt++;
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break;
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}
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if (ch == '\n')
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break;
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}
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}
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return cnt;
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}
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|
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static int ident_to_git(const char *path, const char *src, size_t len,
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struct strbuf *buf, int ident)
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{
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char *dst, *dollar;
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|
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if (!ident || (src && !count_ident(src, len)))
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return 0;
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|
|
if (!buf)
|
|
return 1;
|
|
|
|
/* only grow if not in place */
|
|
if (strbuf_avail(buf) + buf->len < len)
|
|
strbuf_grow(buf, len - buf->len);
|
|
dst = buf->buf;
|
|
for (;;) {
|
|
dollar = memchr(src, '$', len);
|
|
if (!dollar)
|
|
break;
|
|
memmove(dst, src, dollar + 1 - src);
|
|
dst += dollar + 1 - src;
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
|
|
if (len > 3 && !memcmp(src, "Id:", 3)) {
|
|
dollar = memchr(src + 3, '$', len - 3);
|
|
if (!dollar)
|
|
break;
|
|
if (memchr(src + 3, '\n', dollar - src - 3)) {
|
|
/* Line break before the next dollar. */
|
|
continue;
|
|
}
|
|
|
|
memcpy(dst, "Id$", 3);
|
|
dst += 3;
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
}
|
|
}
|
|
memmove(dst, src, len);
|
|
strbuf_setlen(buf, dst + len - buf->buf);
|
|
return 1;
|
|
}
|
|
|
|
static int ident_to_worktree(const char *path, const char *src, size_t len,
|
|
struct strbuf *buf, int ident)
|
|
{
|
|
unsigned char sha1[20];
|
|
char *to_free = NULL, *dollar, *spc;
|
|
int cnt;
|
|
|
|
if (!ident)
|
|
return 0;
|
|
|
|
cnt = count_ident(src, len);
|
|
if (!cnt)
|
|
return 0;
|
|
|
|
/* are we "faking" in place editing ? */
|
|
if (src == buf->buf)
|
|
to_free = strbuf_detach(buf, NULL);
|
|
hash_sha1_file(src, len, "blob", sha1);
|
|
|
|
strbuf_grow(buf, len + cnt * 43);
|
|
for (;;) {
|
|
/* step 1: run to the next '$' */
|
|
dollar = memchr(src, '$', len);
|
|
if (!dollar)
|
|
break;
|
|
strbuf_add(buf, src, dollar + 1 - src);
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
|
|
/* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
|
|
if (len < 3 || memcmp("Id", src, 2))
|
|
continue;
|
|
|
|
/* step 3: skip over Id$ or Id:xxxxx$ */
|
|
if (src[2] == '$') {
|
|
src += 3;
|
|
len -= 3;
|
|
} else if (src[2] == ':') {
|
|
/*
|
|
* It's possible that an expanded Id has crept its way into the
|
|
* repository, we cope with that by stripping the expansion out.
|
|
* This is probably not a good idea, since it will cause changes
|
|
* on checkout, which won't go away by stash, but let's keep it
|
|
* for git-style ids.
|
|
*/
|
|
dollar = memchr(src + 3, '$', len - 3);
|
|
if (!dollar) {
|
|
/* incomplete keyword, no more '$', so just quit the loop */
|
|
break;
|
|
}
|
|
|
|
if (memchr(src + 3, '\n', dollar - src - 3)) {
|
|
/* Line break before the next dollar. */
|
|
continue;
|
|
}
|
|
|
|
spc = memchr(src + 4, ' ', dollar - src - 4);
|
|
if (spc && spc < dollar-1) {
|
|
/* There are spaces in unexpected places.
|
|
* This is probably an id from some other
|
|
* versioning system. Keep it for now.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
} else {
|
|
/* it wasn't a "Id$" or "Id:xxxx$" */
|
|
continue;
|
|
}
|
|
|
|
/* step 4: substitute */
|
|
strbuf_addstr(buf, "Id: ");
|
|
strbuf_add(buf, sha1_to_hex(sha1), 40);
|
|
strbuf_addstr(buf, " $");
|
|
}
|
|
strbuf_add(buf, src, len);
|
|
|
|
free(to_free);
|
|
return 1;
|
|
}
|
|
|
|
static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
if (ATTR_TRUE(value))
|
|
return CRLF_TEXT;
|
|
else if (ATTR_FALSE(value))
|
|
return CRLF_BINARY;
|
|
else if (ATTR_UNSET(value))
|
|
;
|
|
else if (!strcmp(value, "input"))
|
|
return CRLF_INPUT;
|
|
else if (!strcmp(value, "auto"))
|
|
return CRLF_AUTO;
|
|
return CRLF_GUESS;
|
|
}
|
|
|
|
static enum eol git_path_check_eol(const char *path, struct git_attr_check *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
if (ATTR_UNSET(value))
|
|
;
|
|
else if (!strcmp(value, "lf"))
|
|
return EOL_LF;
|
|
else if (!strcmp(value, "crlf"))
|
|
return EOL_CRLF;
|
|
return EOL_UNSET;
|
|
}
|
|
|
|
static struct convert_driver *git_path_check_convert(const char *path,
|
|
struct git_attr_check *check)
|
|
{
|
|
const char *value = check->value;
|
|
struct convert_driver *drv;
|
|
|
|
if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
|
|
return NULL;
|
|
for (drv = user_convert; drv; drv = drv->next)
|
|
if (!strcmp(value, drv->name))
|
|
return drv;
|
|
return NULL;
|
|
}
|
|
|
|
static int git_path_check_ident(const char *path, struct git_attr_check *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
return !!ATTR_TRUE(value);
|
|
}
|
|
|
|
static enum crlf_action input_crlf_action(enum crlf_action text_attr, enum eol eol_attr)
|
|
{
|
|
if (text_attr == CRLF_BINARY)
|
|
return CRLF_BINARY;
|
|
if (eol_attr == EOL_LF)
|
|
return CRLF_INPUT;
|
|
if (eol_attr == EOL_CRLF)
|
|
return CRLF_CRLF;
|
|
return text_attr;
|
|
}
|
|
|
|
struct conv_attrs {
|
|
struct convert_driver *drv;
|
|
enum crlf_action crlf_action;
|
|
enum eol eol_attr;
|
|
int ident;
|
|
};
|
|
|
|
static const char *conv_attr_name[] = {
|
|
"crlf", "ident", "filter", "eol", "text",
|
|
};
|
|
#define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name)
|
|
|
|
static void convert_attrs(struct conv_attrs *ca, const char *path)
|
|
{
|
|
int i;
|
|
static struct git_attr_check ccheck[NUM_CONV_ATTRS];
|
|
|
|
if (!ccheck[0].attr) {
|
|
for (i = 0; i < NUM_CONV_ATTRS; i++)
|
|
ccheck[i].attr = git_attr(conv_attr_name[i]);
|
|
user_convert_tail = &user_convert;
|
|
git_config(read_convert_config, NULL);
|
|
}
|
|
|
|
if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) {
|
|
ca->crlf_action = git_path_check_crlf(path, ccheck + 4);
|
|
if (ca->crlf_action == CRLF_GUESS)
|
|
ca->crlf_action = git_path_check_crlf(path, ccheck + 0);
|
|
ca->ident = git_path_check_ident(path, ccheck + 1);
|
|
ca->drv = git_path_check_convert(path, ccheck + 2);
|
|
ca->eol_attr = git_path_check_eol(path, ccheck + 3);
|
|
} else {
|
|
ca->drv = NULL;
|
|
ca->crlf_action = CRLF_GUESS;
|
|
ca->eol_attr = EOL_UNSET;
|
|
ca->ident = 0;
|
|
}
|
|
}
|
|
|
|
int convert_to_git(const char *path, const char *src, size_t len,
|
|
struct strbuf *dst, enum safe_crlf checksafe)
|
|
{
|
|
int ret = 0;
|
|
const char *filter = NULL;
|
|
int required = 0;
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
if (ca.drv) {
|
|
filter = ca.drv->clean;
|
|
required = ca.drv->required;
|
|
}
|
|
|
|
ret |= apply_filter(path, src, len, dst, filter);
|
|
if (!ret && required)
|
|
die("%s: clean filter '%s' failed", path, ca.drv->name);
|
|
|
|
if (ret && dst) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
|
|
ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
|
|
if (ret && dst) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
return ret | ident_to_git(path, src, len, dst, ca.ident);
|
|
}
|
|
|
|
static int convert_to_working_tree_internal(const char *path, const char *src,
|
|
size_t len, struct strbuf *dst,
|
|
int normalizing)
|
|
{
|
|
int ret = 0, ret_filter = 0;
|
|
const char *filter = NULL;
|
|
int required = 0;
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
if (ca.drv) {
|
|
filter = ca.drv->smudge;
|
|
required = ca.drv->required;
|
|
}
|
|
|
|
ret |= ident_to_worktree(path, src, len, dst, ca.ident);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
/*
|
|
* CRLF conversion can be skipped if normalizing, unless there
|
|
* is a smudge filter. The filter might expect CRLFs.
|
|
*/
|
|
if (filter || !normalizing) {
|
|
ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
|
|
ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
}
|
|
|
|
ret_filter = apply_filter(path, src, len, dst, filter);
|
|
if (!ret_filter && required)
|
|
die("%s: smudge filter %s failed", path, ca.drv->name);
|
|
|
|
return ret | ret_filter;
|
|
}
|
|
|
|
int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
|
|
{
|
|
return convert_to_working_tree_internal(path, src, len, dst, 0);
|
|
}
|
|
|
|
int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
|
|
{
|
|
int ret = convert_to_working_tree_internal(path, src, len, dst, 1);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE);
|
|
}
|
|
|
|
/*****************************************************************
|
|
*
|
|
* Streaming converison support
|
|
*
|
|
*****************************************************************/
|
|
|
|
typedef int (*filter_fn)(struct stream_filter *,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p);
|
|
typedef void (*free_fn)(struct stream_filter *);
|
|
|
|
struct stream_filter_vtbl {
|
|
filter_fn filter;
|
|
free_fn free;
|
|
};
|
|
|
|
struct stream_filter {
|
|
struct stream_filter_vtbl *vtbl;
|
|
};
|
|
|
|
static int null_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
size_t count;
|
|
|
|
if (!input)
|
|
return 0; /* we do not keep any states */
|
|
count = *isize_p;
|
|
if (*osize_p < count)
|
|
count = *osize_p;
|
|
if (count) {
|
|
memmove(output, input, count);
|
|
*isize_p -= count;
|
|
*osize_p -= count;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void null_free_fn(struct stream_filter *filter)
|
|
{
|
|
; /* nothing -- null instances are shared */
|
|
}
|
|
|
|
static struct stream_filter_vtbl null_vtbl = {
|
|
null_filter_fn,
|
|
null_free_fn,
|
|
};
|
|
|
|
static struct stream_filter null_filter_singleton = {
|
|
&null_vtbl,
|
|
};
|
|
|
|
int is_null_stream_filter(struct stream_filter *filter)
|
|
{
|
|
return filter == &null_filter_singleton;
|
|
}
|
|
|
|
|
|
/*
|
|
* LF-to-CRLF filter
|
|
*/
|
|
|
|
struct lf_to_crlf_filter {
|
|
struct stream_filter filter;
|
|
unsigned has_held:1;
|
|
char held;
|
|
};
|
|
|
|
static int lf_to_crlf_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
size_t count, o = 0;
|
|
struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
|
|
|
|
/*
|
|
* We may be holding onto the CR to see if it is followed by a
|
|
* LF, in which case we would need to go to the main loop.
|
|
* Otherwise, just emit it to the output stream.
|
|
*/
|
|
if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
|
|
output[o++] = lf_to_crlf->held;
|
|
lf_to_crlf->has_held = 0;
|
|
}
|
|
|
|
/* We are told to drain */
|
|
if (!input) {
|
|
*osize_p -= o;
|
|
return 0;
|
|
}
|
|
|
|
count = *isize_p;
|
|
if (count || lf_to_crlf->has_held) {
|
|
size_t i;
|
|
int was_cr = 0;
|
|
|
|
if (lf_to_crlf->has_held) {
|
|
was_cr = 1;
|
|
lf_to_crlf->has_held = 0;
|
|
}
|
|
|
|
for (i = 0; o < *osize_p && i < count; i++) {
|
|
char ch = input[i];
|
|
|
|
if (ch == '\n') {
|
|
output[o++] = '\r';
|
|
} else if (was_cr) {
|
|
/*
|
|
* Previous round saw CR and it is not followed
|
|
* by a LF; emit the CR before processing the
|
|
* current character.
|
|
*/
|
|
output[o++] = '\r';
|
|
}
|
|
|
|
/*
|
|
* We may have consumed the last output slot,
|
|
* in which case we need to break out of this
|
|
* loop; hold the current character before
|
|
* returning.
|
|
*/
|
|
if (*osize_p <= o) {
|
|
lf_to_crlf->has_held = 1;
|
|
lf_to_crlf->held = ch;
|
|
continue; /* break but increment i */
|
|
}
|
|
|
|
if (ch == '\r') {
|
|
was_cr = 1;
|
|
continue;
|
|
}
|
|
|
|
was_cr = 0;
|
|
output[o++] = ch;
|
|
}
|
|
|
|
*osize_p -= o;
|
|
*isize_p -= i;
|
|
|
|
if (!lf_to_crlf->has_held && was_cr) {
|
|
lf_to_crlf->has_held = 1;
|
|
lf_to_crlf->held = '\r';
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void lf_to_crlf_free_fn(struct stream_filter *filter)
|
|
{
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl lf_to_crlf_vtbl = {
|
|
lf_to_crlf_filter_fn,
|
|
lf_to_crlf_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *lf_to_crlf_filter(void)
|
|
{
|
|
struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
|
|
|
|
lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
|
|
return (struct stream_filter *)lf_to_crlf;
|
|
}
|
|
|
|
/*
|
|
* Cascade filter
|
|
*/
|
|
#define FILTER_BUFFER 1024
|
|
struct cascade_filter {
|
|
struct stream_filter filter;
|
|
struct stream_filter *one;
|
|
struct stream_filter *two;
|
|
char buf[FILTER_BUFFER];
|
|
int end, ptr;
|
|
};
|
|
|
|
static int cascade_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
struct cascade_filter *cas = (struct cascade_filter *) filter;
|
|
size_t filled = 0;
|
|
size_t sz = *osize_p;
|
|
size_t to_feed, remaining;
|
|
|
|
/*
|
|
* input -- (one) --> buf -- (two) --> output
|
|
*/
|
|
while (filled < sz) {
|
|
remaining = sz - filled;
|
|
|
|
/* do we already have something to feed two with? */
|
|
if (cas->ptr < cas->end) {
|
|
to_feed = cas->end - cas->ptr;
|
|
if (stream_filter(cas->two,
|
|
cas->buf + cas->ptr, &to_feed,
|
|
output + filled, &remaining))
|
|
return -1;
|
|
cas->ptr += (cas->end - cas->ptr) - to_feed;
|
|
filled = sz - remaining;
|
|
continue;
|
|
}
|
|
|
|
/* feed one from upstream and have it emit into our buffer */
|
|
to_feed = input ? *isize_p : 0;
|
|
if (input && !to_feed)
|
|
break;
|
|
remaining = sizeof(cas->buf);
|
|
if (stream_filter(cas->one,
|
|
input, &to_feed,
|
|
cas->buf, &remaining))
|
|
return -1;
|
|
cas->end = sizeof(cas->buf) - remaining;
|
|
cas->ptr = 0;
|
|
if (input) {
|
|
size_t fed = *isize_p - to_feed;
|
|
*isize_p -= fed;
|
|
input += fed;
|
|
}
|
|
|
|
/* do we know that we drained one completely? */
|
|
if (input || cas->end)
|
|
continue;
|
|
|
|
/* tell two to drain; we have nothing more to give it */
|
|
to_feed = 0;
|
|
remaining = sz - filled;
|
|
if (stream_filter(cas->two,
|
|
NULL, &to_feed,
|
|
output + filled, &remaining))
|
|
return -1;
|
|
if (remaining == (sz - filled))
|
|
break; /* completely drained two */
|
|
filled = sz - remaining;
|
|
}
|
|
*osize_p -= filled;
|
|
return 0;
|
|
}
|
|
|
|
static void cascade_free_fn(struct stream_filter *filter)
|
|
{
|
|
struct cascade_filter *cas = (struct cascade_filter *)filter;
|
|
free_stream_filter(cas->one);
|
|
free_stream_filter(cas->two);
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl cascade_vtbl = {
|
|
cascade_filter_fn,
|
|
cascade_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *cascade_filter(struct stream_filter *one,
|
|
struct stream_filter *two)
|
|
{
|
|
struct cascade_filter *cascade;
|
|
|
|
if (!one || is_null_stream_filter(one))
|
|
return two;
|
|
if (!two || is_null_stream_filter(two))
|
|
return one;
|
|
|
|
cascade = xmalloc(sizeof(*cascade));
|
|
cascade->one = one;
|
|
cascade->two = two;
|
|
cascade->end = cascade->ptr = 0;
|
|
cascade->filter.vtbl = &cascade_vtbl;
|
|
return (struct stream_filter *)cascade;
|
|
}
|
|
|
|
/*
|
|
* ident filter
|
|
*/
|
|
#define IDENT_DRAINING (-1)
|
|
#define IDENT_SKIPPING (-2)
|
|
struct ident_filter {
|
|
struct stream_filter filter;
|
|
struct strbuf left;
|
|
int state;
|
|
char ident[45]; /* ": x40 $" */
|
|
};
|
|
|
|
static int is_foreign_ident(const char *str)
|
|
{
|
|
int i;
|
|
|
|
if (prefixcmp(str, "$Id: "))
|
|
return 0;
|
|
for (i = 5; str[i]; i++) {
|
|
if (isspace(str[i]) && str[i+1] != '$')
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
|
|
{
|
|
size_t to_drain = ident->left.len;
|
|
|
|
if (*osize_p < to_drain)
|
|
to_drain = *osize_p;
|
|
if (to_drain) {
|
|
memcpy(*output_p, ident->left.buf, to_drain);
|
|
strbuf_remove(&ident->left, 0, to_drain);
|
|
*output_p += to_drain;
|
|
*osize_p -= to_drain;
|
|
}
|
|
if (!ident->left.len)
|
|
ident->state = 0;
|
|
}
|
|
|
|
static int ident_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
struct ident_filter *ident = (struct ident_filter *)filter;
|
|
static const char head[] = "$Id";
|
|
|
|
if (!input) {
|
|
/* drain upon eof */
|
|
switch (ident->state) {
|
|
default:
|
|
strbuf_add(&ident->left, head, ident->state);
|
|
case IDENT_SKIPPING:
|
|
/* fallthru */
|
|
case IDENT_DRAINING:
|
|
ident_drain(ident, &output, osize_p);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
while (*isize_p || (ident->state == IDENT_DRAINING)) {
|
|
int ch;
|
|
|
|
if (ident->state == IDENT_DRAINING) {
|
|
ident_drain(ident, &output, osize_p);
|
|
if (!*osize_p)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
ch = *(input++);
|
|
(*isize_p)--;
|
|
|
|
if (ident->state == IDENT_SKIPPING) {
|
|
/*
|
|
* Skipping until '$' or LF, but keeping them
|
|
* in case it is a foreign ident.
|
|
*/
|
|
strbuf_addch(&ident->left, ch);
|
|
if (ch != '\n' && ch != '$')
|
|
continue;
|
|
if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
|
|
strbuf_setlen(&ident->left, sizeof(head) - 1);
|
|
strbuf_addstr(&ident->left, ident->ident);
|
|
}
|
|
ident->state = IDENT_DRAINING;
|
|
continue;
|
|
}
|
|
|
|
if (ident->state < sizeof(head) &&
|
|
head[ident->state] == ch) {
|
|
ident->state++;
|
|
continue;
|
|
}
|
|
|
|
if (ident->state)
|
|
strbuf_add(&ident->left, head, ident->state);
|
|
if (ident->state == sizeof(head) - 1) {
|
|
if (ch != ':' && ch != '$') {
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = 0;
|
|
continue;
|
|
}
|
|
|
|
if (ch == ':') {
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = IDENT_SKIPPING;
|
|
} else {
|
|
strbuf_addstr(&ident->left, ident->ident);
|
|
ident->state = IDENT_DRAINING;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = IDENT_DRAINING;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void ident_free_fn(struct stream_filter *filter)
|
|
{
|
|
struct ident_filter *ident = (struct ident_filter *)filter;
|
|
strbuf_release(&ident->left);
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl ident_vtbl = {
|
|
ident_filter_fn,
|
|
ident_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *ident_filter(const unsigned char *sha1)
|
|
{
|
|
struct ident_filter *ident = xmalloc(sizeof(*ident));
|
|
|
|
sprintf(ident->ident, ": %s $", sha1_to_hex(sha1));
|
|
strbuf_init(&ident->left, 0);
|
|
ident->filter.vtbl = &ident_vtbl;
|
|
ident->state = 0;
|
|
return (struct stream_filter *)ident;
|
|
}
|
|
|
|
/*
|
|
* Return an appropriately constructed filter for the path, or NULL if
|
|
* the contents cannot be filtered without reading the whole thing
|
|
* in-core.
|
|
*
|
|
* Note that you would be crazy to set CRLF, smuge/clean or ident to a
|
|
* large binary blob you would want us not to slurp into the memory!
|
|
*/
|
|
struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
|
|
{
|
|
struct conv_attrs ca;
|
|
enum crlf_action crlf_action;
|
|
struct stream_filter *filter = NULL;
|
|
|
|
convert_attrs(&ca, path);
|
|
|
|
if (ca.drv && (ca.drv->smudge || ca.drv->clean))
|
|
return filter;
|
|
|
|
if (ca.ident)
|
|
filter = ident_filter(sha1);
|
|
|
|
crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
|
|
|
|
if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) ||
|
|
(crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE))
|
|
filter = cascade_filter(filter, &null_filter_singleton);
|
|
|
|
else if (output_eol(crlf_action) == EOL_CRLF &&
|
|
!(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
|
|
filter = cascade_filter(filter, lf_to_crlf_filter());
|
|
|
|
return filter;
|
|
}
|
|
|
|
void free_stream_filter(struct stream_filter *filter)
|
|
{
|
|
filter->vtbl->free(filter);
|
|
}
|
|
|
|
int stream_filter(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
|
|
}
|