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130 lines
3.0 KiB
130 lines
3.0 KiB
6 years ago
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diff --git a/src/file.h b/src/file.h
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index 28f9bc7..f55d47f 100644
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--- a/src/file.h
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+++ b/src/file.h
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@@ -446,6 +446,14 @@ protected int file_os2_apptype(struct magic_set *, const char *, const void *,
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#endif /* __EMX__ */
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+typedef struct {
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+ char *buf;
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+ uint32_t offset;
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+} file_pushbuf_t;
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+
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+protected file_pushbuf_t *file_push_buffer(struct magic_set *);
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+protected char *file_pop_buffer(struct magic_set *, file_pushbuf_t *);
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+
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#ifndef COMPILE_ONLY
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extern const char *file_names[];
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extern const size_t file_nnames;
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diff --git a/src/funcs.c b/src/funcs.c
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index 0d645eb..04bab02 100644
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--- a/src/funcs.c
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+++ b/src/funcs.c
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@@ -459,3 +459,43 @@ file_replace(struct magic_set *ms, const char *pat, const char *rep)
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return nm;
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}
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}
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+
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+protected file_pushbuf_t *
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+file_push_buffer(struct magic_set *ms)
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+{
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+ file_pushbuf_t *pb;
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+
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+ if (ms->event_flags & EVENT_HAD_ERR)
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+ return NULL;
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+
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+ if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
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+ return NULL;
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+
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+ pb->buf = ms->o.buf;
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+ pb->offset = ms->offset;
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+
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+ ms->o.buf = NULL;
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+ ms->offset = 0;
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+
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+ return pb;
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+}
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+
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+protected char *
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+file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
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+{
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+ char *rbuf;
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+
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+ if (ms->event_flags & EVENT_HAD_ERR) {
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+ free(pb->buf);
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+ free(pb);
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+ return NULL;
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+ }
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+
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+ rbuf = ms->o.buf;
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+
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+ ms->o.buf = pb->buf;
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+ ms->offset = pb->offset;
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+
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+ free(pb);
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+ return rbuf;
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+}
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diff --git a/src/softmagic.c b/src/softmagic.c
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index ee979b9..3695add 100644
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--- a/src/softmagic.c
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+++ b/src/softmagic.c
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@@ -60,6 +60,7 @@ private void cvt_32(union VALUETYPE *, const struct magic *);
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private void cvt_64(union VALUETYPE *, const struct magic *);
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#define OFFSET_OOB(n, o, i) ((n) < (o) || (i) > ((n) - (o)))
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+
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/*
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* softmagic - lookup one file in parsed, in-memory copy of database
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* Passed the name and FILE * of one file to be typed.
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@@ -1060,6 +1061,9 @@ mget(struct magic_set *ms, const unsigned char *s,
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{
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uint32_t offset = ms->offset;
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union VALUETYPE *p = &ms->ms_value;
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+ file_pushbuf_t *pb;
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+ char *rbuf;
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+ int rv;
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if (recursion_level >= 20) {
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file_error(ms, 0, "recursion nesting exceeded");
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@@ -1620,16 +1624,34 @@ mget(struct magic_set *ms, const unsigned char *s,
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break;
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case FILE_INDIRECT:
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- if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 &&
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- file_printf(ms, "%s", m->desc) == -1)
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- return -1;
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if (offset == 0)
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return 0;
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+
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if (nbytes < offset)
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- return 0;
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- return file_softmagic(ms, s + offset, nbytes - offset,
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+ return 0;
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+
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+ if ((pb = file_push_buffer(ms)) == NULL)
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+ return -1;
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+
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+ rv = file_softmagic(ms, s + offset, nbytes - offset,
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recursion_level, BINTEST, text);
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+ if ((ms->flags & MAGIC_DEBUG) != 0)
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+ fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
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+
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+ rbuf = file_pop_buffer(ms, pb);
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+ if (rbuf == NULL && ms->event_flags & EVENT_HAD_ERR)
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+ return -1;
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+
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+ if (rv == 1) {
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+ if (file_printf(ms, "%s", rbuf) == -1) {
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+ free(rbuf);
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+ return -1;
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+ }
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+ }
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+ free(rbuf);
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+ return rv;
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+
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case FILE_DEFAULT: /* nothing to check */
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default:
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break;
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