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-rw-r--r--media/webrtc/signaling/src/sdp/sipcc/cpr_string.c272
1 files changed, 272 insertions, 0 deletions
diff --git a/media/webrtc/signaling/src/sdp/sipcc/cpr_string.c b/media/webrtc/signaling/src/sdp/sipcc/cpr_string.c
new file mode 100644
index 000000000..c210c3971
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+++ b/media/webrtc/signaling/src/sdp/sipcc/cpr_string.c
@@ -0,0 +1,272 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdarg.h>
+
+#include "mozilla/Assertions.h"
+#include "cpr_types.h"
+#include "cpr_string.h"
+#include "cpr_strings.h"
+
+/* From cpr_stdlib.h */
+#include "mozilla/mozalloc.h"
+
+#define cpr_malloc(a) moz_xmalloc(a)
+#define cpr_calloc(a, b) moz_xcalloc(a, b)
+#define cpr_realloc(a, b) moz_xrealloc(a, b)
+#define cpr_free(a) free(a)
+
+
+/**
+ * sstrncpy
+ *
+ * This is Cisco's *safe* version of strncpy. The string will always
+ * be NUL terminated (which is not ANSI compliant).
+ *
+ * Parameters: s1 - first string
+ * s2 - second string
+ * max - maximum length in octets to concat.
+ *
+ * Return: Pointer to the *end* of the string
+ *
+ * Remarks: Modified to be explicitly safe for all inputs.
+ * Also return the number of characters copied excluding the
+ * NUL terminator vs. the original string s1. This simplifies
+ * code where sstrncat functions follow.
+ */
+unsigned long
+sstrncpy (char *dst, const char *src, unsigned long max)
+{
+ unsigned long cnt = 0;
+
+ if (dst == NULL) {
+ return 0;
+ }
+
+ if (src) {
+ while ((max-- > 1) && (*src)) {
+ *dst = *src;
+ dst++;
+ src++;
+ cnt++;
+ }
+ }
+
+#if defined(CPR_SSTRNCPY_PAD)
+ /*
+ * To be equivalent to the TI compiler version
+ * v2.01, SSTRNCPY_PAD needs to be defined
+ */
+ while (max-- > 1) {
+ *dst = '\0';
+ dst++;
+ }
+#endif
+ *dst = '\0';
+
+ return cnt;
+}
+
+/**
+ * sstrncat
+ *
+ * This is Cisco's *safe* version of strncat. The string will always
+ * be NUL terminated (which is not ANSI compliant).
+ *
+ * Parameters: s1 - first string
+ * s2 - second string
+ * max - maximum length in octets to concatenate
+ *
+ * Return: Pointer to the *end* of the string
+ *
+ * Remarks: Modified to be explicitly safe for all inputs.
+ * Also return the end vs. the beginning of the string s1
+ * which is useful for multiple sstrncat calls.
+ */
+char *
+sstrncat (char *s1, const char *s2, unsigned long max)
+{
+ if (s1 == NULL)
+ return (char *) NULL;
+
+ while (*s1)
+ s1++;
+
+ if (s2) {
+ while ((max-- > 1) && (*s2)) {
+ *s1 = *s2;
+ s1++;
+ s2++;
+ }
+ }
+ *s1 = '\0';
+
+ return s1;
+}
+
+/*
+ * flex_string
+ */
+
+/*
+ * flex_string_init
+ *
+ * Not thread-safe
+ */
+void flex_string_init(flex_string *fs) {
+ fs->buffer_length = FLEX_STRING_CHUNK_SIZE;
+ fs->string_length = 0;
+ fs->buffer = cpr_malloc(fs->buffer_length);
+ fs->buffer[0] = '\0';
+}
+
+/*
+ * flex_string_free
+ *
+ * Not thread-safe
+ */
+void flex_string_free(flex_string *fs) {
+ fs->buffer_length = 0;
+ fs->string_length = 0;
+ cpr_free(fs->buffer);
+ fs->buffer = NULL;
+}
+
+/* For sanity check before alloc */
+#define FLEX_STRING_MAX_SIZE (10 * 1024 * 1024) /* 10MB */
+
+/*
+ * flex_string_check_alloc
+ *
+ * Allocate enough chunks to hold the new minimum size.
+ *
+ * Not thread-safe
+ */
+void flex_string_check_alloc(flex_string *fs, size_t new_min_length) {
+ if (new_min_length > fs->buffer_length) {
+ /* Oversize, allocate more */
+
+ /* Sanity check on allocation size */
+ if (new_min_length > FLEX_STRING_MAX_SIZE) {
+ MOZ_CRASH();
+ }
+
+ /* Alloc to nearest chunk */
+ fs->buffer_length = (((new_min_length - 1) / FLEX_STRING_CHUNK_SIZE) + 1) * FLEX_STRING_CHUNK_SIZE;
+
+ fs->buffer = cpr_realloc(fs->buffer, fs->buffer_length);
+ }
+}
+
+/*
+ * flex_string_append
+ *
+ * Not thread-safe
+ */
+void flex_string_append(flex_string *fs, const char *more) {
+ fs->string_length += strlen(more);
+
+ flex_string_check_alloc(fs, fs->string_length + 1);
+
+ sstrncat(fs->buffer, more, fs->buffer_length - strlen(fs->buffer));
+}
+
+/*
+ * va_copy is part of the C99 spec but MSVC doesn't have it.
+ */
+#ifndef va_copy
+#define va_copy(d,s) ((d) = (s))
+#endif
+
+/*
+ * flex_string_vsprintf
+ *
+ * Not thread-safe
+ */
+void flex_string_vsprintf(flex_string *fs, const char *format, va_list original_ap) {
+ va_list ap;
+ int vsnprintf_result;
+
+ va_copy(ap, original_ap);
+ vsnprintf_result = vsnprintf(fs->buffer + fs->string_length, fs->buffer_length - fs->string_length, format, ap);
+ va_end(ap);
+
+ /* Special case just for Windows where vsnprintf is broken
+ and returns -1 if buffer too large unless you size it 0. */
+ if (vsnprintf_result < 0) {
+ va_copy(ap, original_ap);
+ vsnprintf_result = vsnprintf(NULL, 0, format, ap);
+ va_end(ap);
+ }
+
+ if (fs->string_length + vsnprintf_result >= fs->buffer_length) {
+ /* Buffer overflow, resize */
+ flex_string_check_alloc(fs, fs->string_length + vsnprintf_result + 1);
+
+ /* Try again with new buffer */
+ va_copy(ap, original_ap);
+ vsnprintf_result = vsnprintf(fs->buffer + fs->string_length, fs->buffer_length - fs->string_length, format, ap);
+ va_end(ap);
+ MOZ_ASSERT(vsnprintf_result > 0 &&
+ (size_t)vsnprintf_result < (fs->buffer_length - fs->string_length));
+ }
+
+ if (vsnprintf_result > 0) {
+ fs->string_length += vsnprintf_result;
+ }
+}
+
+/*
+ * flex_string_sprintf
+ *
+ * Not thread-safe
+ */
+void flex_string_sprintf(flex_string *fs, const char *format, ...) {
+ va_list ap;
+
+ va_start(ap, format);
+ flex_string_vsprintf(fs, format, ap);
+ va_end(ap);
+}
+
+
+
+/* From cpr_linux_string.c */
+/**
+ * cpr_strdup
+ *
+ * @brief The CPR wrapper for strdup
+
+ * The cpr_strdup shall return a pointer to a new string, which is a duplicate
+ * of the string pointed to by "str" argument. A null pointer is returned if the
+ * new string cannot be created.
+ *
+ * @param[in] str - The string that needs to be duplicated
+ *
+ * @return The duplicated string or NULL in case of no memory
+ *
+ */
+char *
+cpr_strdup (const char *str)
+{
+ char *dup;
+ size_t len;
+
+ if (!str) {
+ return (char *) NULL;
+ }
+
+ len = strlen(str);
+ if (len == 0) {
+ return (char *) NULL;
+ }
+ len++;
+
+ dup = cpr_malloc(len * sizeof(char));
+ if (!dup) {
+ return (char *) NULL;
+ }
+ (void) memcpy(dup, str, len);
+ return dup;
+}