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-rw-r--r--xdiff/xdiff.h16
-rw-r--r--xdiff/xdiffi.c21
-rw-r--r--xdiff/xemit.c12
-rw-r--r--xdiff/xhistogram.c2
-rw-r--r--xdiff/xpatience.c2
-rw-r--r--xdiff/xprepare.c21
-rw-r--r--xdiff/xutils.c149
-rw-r--r--xdiff/xutils.h3
8 files changed, 150 insertions, 76 deletions
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 00d36c3ac7..219a3bbca6 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -32,14 +32,12 @@ extern "C" {
#define XDF_IGNORE_WHITESPACE (1 << 2)
#define XDF_IGNORE_WHITESPACE_CHANGE (1 << 3)
#define XDF_IGNORE_WHITESPACE_AT_EOL (1 << 4)
-#define XDF_PATIENCE_DIFF (1 << 5)
-#define XDF_HISTOGRAM_DIFF (1 << 6)
#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE | XDF_IGNORE_WHITESPACE_AT_EOL)
-#define XDL_PATCH_NORMAL '-'
-#define XDL_PATCH_REVERSE '+'
-#define XDL_PATCH_MODEMASK ((1 << 8) - 1)
-#define XDL_PATCH_IGNOREBSPACE (1 << 8)
+#define XDF_PATIENCE_DIFF (1 << 5)
+#define XDF_HISTOGRAM_DIFF (1 << 6)
+#define XDF_DIFF_ALGORITHM_MASK (XDF_PATIENCE_DIFF | XDF_HISTOGRAM_DIFF)
+#define XDF_DIFF_ALG(x) ((x) & XDF_DIFF_ALGORITHM_MASK)
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)
@@ -88,13 +86,17 @@ typedef struct s_xdemitcb {
typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);
+typedef int (*xdl_emit_hunk_consume_func_t)(long start_a, long count_a,
+ long start_b, long count_b,
+ void *cb_data);
+
typedef struct s_xdemitconf {
long ctxlen;
long interhunkctxlen;
unsigned long flags;
find_func_t find_func;
void *find_func_priv;
- void (*emit_func)();
+ xdl_emit_hunk_consume_func_t hunk_func;
} xdemitconf_t;
typedef struct s_bdiffparam {
diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 75a3922750..1b7012a119 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -328,10 +328,10 @@ int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdalgoenv_t xenv;
diffdata_t dd1, dd2;
- if (xpp->flags & XDF_PATIENCE_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_PATIENCE_DIFF)
return xdl_do_patience_diff(mf1, mf2, xpp, xe);
- if (xpp->flags & XDF_HISTOGRAM_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
return xdl_do_histogram_diff(mf1, mf2, xpp, xe);
if (xdl_prepare_env(mf1, mf2, xpp, xe) < 0) {
@@ -538,13 +538,26 @@ void xdl_free_script(xdchange_t *xscr) {
}
}
+static int xdl_call_hunk_func(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
+ xdemitconf_t const *xecfg)
+{
+ xdchange_t *xch, *xche;
+
+ for (xch = xscr; xch; xch = xche->next) {
+ xche = xdl_get_hunk(xch, xecfg);
+ if (xecfg->hunk_func(xch->i1, xche->i1 + xche->chg1 - xch->i1,
+ xch->i2, xche->i2 + xche->chg2 - xch->i2,
+ ecb->priv) < 0)
+ return -1;
+ }
+ return 0;
+}
int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdemitconf_t const *xecfg, xdemitcb_t *ecb) {
xdchange_t *xscr;
xdfenv_t xe;
- emit_func_t ef = xecfg->emit_func ?
- (emit_func_t)xecfg->emit_func : xdl_emit_diff;
+ emit_func_t ef = xecfg->hunk_func ? xdl_call_hunk_func : xdl_emit_diff;
if (xdl_do_diff(mf1, mf2, xpp, &xe) < 0) {
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 2e669c3e25..d11dbf9f13 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -87,7 +87,7 @@ static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
- xdfile_t *xdf = &xe->xdf1;
+ xdfile_t *xdf = &xe->xdf2;
const char *rchg = xdf->rchg;
long ix;
@@ -204,8 +204,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
/*
* Emit pre-context.
*/
- for (; s1 < xch->i1; s1++)
- if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
+ for (; s2 < xch->i2; s2++)
+ if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
@@ -213,7 +213,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
* Merge previous with current change atom.
*/
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
- if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
+ if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
/*
@@ -239,8 +239,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
/*
* Emit post-context.
*/
- for (s1 = xche->i1 + xche->chg1; s1 < e1; s1++)
- if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
+ for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
+ if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
}
diff --git a/xdiff/xhistogram.c b/xdiff/xhistogram.c
index 18f6f997c3..bf99787c3e 100644
--- a/xdiff/xhistogram.c
+++ b/xdiff/xhistogram.c
@@ -252,7 +252,7 @@ static int fall_back_to_classic_diff(struct histindex *index,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
- xpp.flags = index->xpp->flags & ~XDF_HISTOGRAM_DIFF;
+ xpp.flags = index->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(index->env, &xpp,
line1, count1, line2, count2);
diff --git a/xdiff/xpatience.c b/xdiff/xpatience.c
index fdd7d0263f..04e1a1ab2a 100644
--- a/xdiff/xpatience.c
+++ b/xdiff/xpatience.c
@@ -288,7 +288,7 @@ static int fall_back_to_classic_diff(struct hashmap *map,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
- xpp.flags = map->xpp->flags & ~XDF_PATIENCE_DIFF;
+ xpp.flags = map->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(map->env, &xpp,
line1, count1, line2, count2);
diff --git a/xdiff/xprepare.c b/xdiff/xprepare.c
index e419f4f726..63a22c630e 100644
--- a/xdiff/xprepare.c
+++ b/xdiff/xprepare.c
@@ -181,7 +181,7 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *))))
goto abort;
- if (xpp->flags & XDF_HISTOGRAM_DIFF)
+ if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
hbits = hsize = 0;
else {
hbits = xdl_hashbits((unsigned int) narec);
@@ -209,8 +209,8 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
crec->ha = hav;
recs[nrec++] = crec;
- if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
+ if ((XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
+ xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
goto abort;
}
}
@@ -273,16 +273,15 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
* (nrecs) will be updated correctly anyway by
* xdl_prepare_ctx().
*/
- sample = xpp->flags & XDF_HISTOGRAM_DIFF ? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1;
+ sample = (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF
+ ? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1);
enl1 = xdl_guess_lines(mf1, sample) + 1;
enl2 = xdl_guess_lines(mf2, sample) + 1;
- if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0) {
-
+ if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF &&
+ xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0)
return -1;
- }
if (xdl_prepare_ctx(1, mf1, enl1, xpp, &cf, &xe->xdf1) < 0) {
@@ -296,9 +295,9 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
return -1;
}
- if (!(xpp->flags & XDF_PATIENCE_DIFF) &&
- !(xpp->flags & XDF_HISTOGRAM_DIFF) &&
- xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
+ if ((XDF_DIFF_ALG(xpp->flags) != XDF_PATIENCE_DIFF) &&
+ (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
+ xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
xdl_free_ctx(&xe->xdf2);
xdl_free_ctx(&xe->xdf1);
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index 0de084e53f..9504eaecb8 100644
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -20,6 +20,8 @@
*
*/
+#include <limits.h>
+#include <assert.h>
#include "xinclude.h"
@@ -120,35 +122,6 @@ void *xdl_cha_alloc(chastore_t *cha) {
return data;
}
-
-void *xdl_cha_first(chastore_t *cha) {
- chanode_t *sncur;
-
- if (!(cha->sncur = sncur = cha->head))
- return NULL;
-
- cha->scurr = 0;
-
- return (char *) sncur + sizeof(chanode_t) + cha->scurr;
-}
-
-
-void *xdl_cha_next(chastore_t *cha) {
- chanode_t *sncur;
-
- if (!(sncur = cha->sncur))
- return NULL;
- cha->scurr += cha->isize;
- if (cha->scurr == sncur->icurr) {
- if (!(sncur = cha->sncur = sncur->next))
- return NULL;
- cha->scurr = 0;
- }
-
- return (char *) sncur + sizeof(chanode_t) + cha->scurr;
-}
-
-
long xdl_guess_lines(mmfile_t *mf, long sample) {
long nl = 0, size, tsize = 0;
char const *data, *cur, *top;
@@ -276,6 +249,109 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
return ha;
}
+#ifdef XDL_FAST_HASH
+
+#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
+
+#define ONEBYTES REPEAT_BYTE(0x01)
+#define NEWLINEBYTES REPEAT_BYTE(0x0a)
+#define HIGHBITS REPEAT_BYTE(0x80)
+
+/* Return the high bit set in the first byte that is a zero */
+static inline unsigned long has_zero(unsigned long a)
+{
+ return ((a - ONEBYTES) & ~a) & HIGHBITS;
+}
+
+static inline long count_masked_bytes(unsigned long mask)
+{
+ if (sizeof(long) == 8) {
+ /*
+ * Jan Achrenius on G+: microoptimized version of
+ * the simpler "(mask & ONEBYTES) * ONEBYTES >> 56"
+ * that works for the bytemasks without having to
+ * mask them first.
+ */
+ /*
+ * return mask * 0x0001020304050608 >> 56;
+ *
+ * Doing it like this avoids warnings on 32-bit machines.
+ */
+ long a = (REPEAT_BYTE(0x01) / 0xff + 1);
+ return mask * a >> (sizeof(long) * 7);
+ } else {
+ /* Carl Chatfield / Jan Achrenius G+ version for 32-bit */
+ /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */
+ long a = (0x0ff0001 + mask) >> 23;
+ /* Fix the 1 for 00 case */
+ return a & mask;
+ }
+}
+
+unsigned long xdl_hash_record(char const **data, char const *top, long flags)
+{
+ unsigned long hash = 5381;
+ unsigned long a = 0, mask = 0;
+ char const *ptr = *data;
+ char const *end = top - sizeof(unsigned long) + 1;
+
+ if (flags & XDF_WHITESPACE_FLAGS)
+ return xdl_hash_record_with_whitespace(data, top, flags);
+
+ ptr -= sizeof(unsigned long);
+ do {
+ hash += hash << 5;
+ hash ^= a;
+ ptr += sizeof(unsigned long);
+ if (ptr >= end)
+ break;
+ a = *(unsigned long *)ptr;
+ /* Do we have any '\n' bytes in this word? */
+ mask = has_zero(a ^ NEWLINEBYTES);
+ } while (!mask);
+
+ if (ptr >= end) {
+ /*
+ * There is only a partial word left at the end of the
+ * buffer. Because we may work with a memory mapping,
+ * we have to grab the rest byte by byte instead of
+ * blindly reading it.
+ *
+ * To avoid problems with masking in a signed value,
+ * we use an unsigned char here.
+ */
+ const char *p;
+ for (p = top - 1; p >= ptr; p--)
+ a = (a << 8) + *((const unsigned char *)p);
+ mask = has_zero(a ^ NEWLINEBYTES);
+ if (!mask)
+ /*
+ * No '\n' found in the partial word. Make a
+ * mask that matches what we read.
+ */
+ mask = 1UL << (8 * (top - ptr) + 7);
+ }
+
+ /* The mask *below* the first high bit set */
+ mask = (mask - 1) & ~mask;
+ mask >>= 7;
+ hash += hash << 5;
+ hash ^= a & mask;
+
+ /* Advance past the last (possibly partial) word */
+ ptr += count_masked_bytes(mask);
+
+ if (ptr < top) {
+ assert(*ptr == '\n');
+ ptr++;
+ }
+
+ *data = ptr;
+
+ return hash;
+}
+
+#else /* XDL_FAST_HASH */
unsigned long xdl_hash_record(char const **data, char const *top, long flags) {
unsigned long ha = 5381;
@@ -293,6 +369,7 @@ unsigned long xdl_hash_record(char const **data, char const *top, long flags) {
return ha;
}
+#endif /* XDL_FAST_HASH */
unsigned int xdl_hashbits(unsigned int size) {
unsigned int val = 1, bits = 0;
@@ -324,20 +401,6 @@ int xdl_num_out(char *out, long val) {
return str - out;
}
-
-long xdl_atol(char const *str, char const **next) {
- long val, base;
- char const *top;
-
- for (top = str; XDL_ISDIGIT(*top); top++);
- if (next)
- *next = top;
- for (val = 0, base = 1, top--; top >= str; top--, base *= 10)
- val += base * (long)(*top - '0');
- return val;
-}
-
-
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen, xdemitcb_t *ecb) {
int nb = 0;
diff --git a/xdiff/xutils.h b/xdiff/xutils.h
index 714719a89c..ad1428ed69 100644
--- a/xdiff/xutils.h
+++ b/xdiff/xutils.h
@@ -31,14 +31,11 @@ int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
int xdl_cha_init(chastore_t *cha, long isize, long icount);
void xdl_cha_free(chastore_t *cha);
void *xdl_cha_alloc(chastore_t *cha);
-void *xdl_cha_first(chastore_t *cha);
-void *xdl_cha_next(chastore_t *cha);
long xdl_guess_lines(mmfile_t *mf, long sample);
int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags);
unsigned long xdl_hash_record(char const **data, char const *top, long flags);
unsigned int xdl_hashbits(unsigned int size);
int xdl_num_out(char *out, long val);
-long xdl_atol(char const *str, char const **next);
int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
const char *func, long funclen, xdemitcb_t *ecb);
int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 06:13:22 +0000