/*
zip_buffer.c -- bounds checked access to memory buffer
- Copyright (C) 2014 Dieter Baron and Thomas Klausner
-
+ Copyright (C) 2014-2021 Dieter Baron and Thomas Klausner
+
This file is part of libzip, a library to manipulate ZIP archives.
- The authors can be contacted at <libzip@nih.at>
-
+ The authors can be contacted at <info@libzip.org>
+
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
-
+
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#include "zipint.h"
zip_uint8_t *
-_zip_buffer_data(zip_buffer_t *buffer)
-{
+_zip_buffer_data(zip_buffer_t *buffer) {
return buffer->data;
}
void
-_zip_buffer_free(zip_buffer_t *buffer)
-{
+_zip_buffer_free(zip_buffer_t *buffer) {
if (buffer == NULL) {
return;
}
-
+
if (buffer->free_data) {
free(buffer->data);
}
-
+
free(buffer);
}
bool
-_zip_buffer_eof(zip_buffer_t *buffer)
-{
+_zip_buffer_eof(zip_buffer_t *buffer) {
return buffer->ok && buffer->offset == buffer->size;
}
zip_uint8_t *
-_zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length)
-{
+_zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length) {
zip_uint8_t *data;
-
- if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
- buffer->ok = false;
- return NULL;
+
+ data = _zip_buffer_peek(buffer, length);
+
+ if (data != NULL) {
+ buffer->offset += length;
}
-
- data = buffer->data + buffer->offset;
- buffer->offset += length;
+
return data;
}
zip_uint16_t
-_zip_buffer_get_16(zip_buffer_t *buffer)
-{
+_zip_buffer_get_16(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 2);
-
+
if (data == NULL) {
return 0;
}
-
+
return (zip_uint16_t)(data[0] + (data[1] << 8));
}
zip_uint32_t
-_zip_buffer_get_32(zip_buffer_t *buffer)
-{
+_zip_buffer_get_32(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 4);
-
+
if (data == NULL) {
return 0;
}
-
+
return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
}
zip_uint64_t
-_zip_buffer_get_64(zip_buffer_t *buffer)
-{
+_zip_buffer_get_64(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 8);
-
+
if (data == NULL) {
return 0;
}
}
-
zip_uint8_t
-_zip_buffer_get_8(zip_buffer_t *buffer)
-{
+_zip_buffer_get_8(zip_buffer_t *buffer) {
zip_uint8_t *data = _zip_buffer_get(buffer, 1);
-
+
if (data == NULL) {
return 0;
}
-
+
return data[0];
}
zip_uint64_t
-_zip_buffer_left(zip_buffer_t *buffer)
-{
+_zip_buffer_left(zip_buffer_t *buffer) {
return buffer->ok ? buffer->size - buffer->offset : 0;
}
+zip_uint64_t
+_zip_buffer_read(zip_buffer_t *buffer, zip_uint8_t *data, zip_uint64_t length) {
+ if (_zip_buffer_left(buffer) < length) {
+ length = _zip_buffer_left(buffer);
+ }
+
+ memcpy(data, _zip_buffer_get(buffer, length), length);
+
+ return length;
+}
+
+
zip_buffer_t *
-_zip_buffer_new(zip_uint8_t *data, zip_uint64_t size)
-{
+_zip_buffer_new(zip_uint8_t *data, zip_uint64_t size) {
bool free_data = (data == NULL);
zip_buffer_t *buffer;
-
+
if (data == NULL) {
if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
return NULL;
}
return NULL;
}
-
+
buffer->ok = true;
buffer->data = data;
buffer->size = size;
buffer->offset = 0;
buffer->free_data = free_data;
-
+
return buffer;
}
zip_buffer_t *
-_zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error)
-{
+_zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error) {
zip_buffer_t *buffer;
-
+
if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
-
+
if (_zip_read(src, buffer->data, size, error) < 0) {
_zip_buffer_free(buffer);
return NULL;
}
-
+
return buffer;
}
zip_uint64_t
-_zip_buffer_offset(zip_buffer_t *buffer)
-{
+_zip_buffer_offset(zip_buffer_t *buffer) {
return buffer->ok ? buffer->offset : 0;
}
bool
-_zip_buffer_ok(zip_buffer_t *buffer)
-{
+_zip_buffer_ok(zip_buffer_t *buffer) {
return buffer->ok;
}
+zip_uint8_t *
+_zip_buffer_peek(zip_buffer_t *buffer, zip_uint64_t length) {
+ zip_uint8_t *data;
+
+ if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
+ buffer->ok = false;
+ return NULL;
+ }
+
+ data = buffer->data + buffer->offset;
+ return data;
+}
+
int
-_zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length)
-{
+_zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length) {
zip_uint8_t *dst = _zip_buffer_get(buffer, length);
-
+
if (dst == NULL) {
return -1;
}
-
+
memcpy(dst, src, length);
return 0;
}
int
-_zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i)
-{
+_zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 2);
-
+
if (data == NULL) {
return -1;
}
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
-
+
return 0;
}
int
-_zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i)
-{
+_zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 4);
-
+
if (data == NULL) {
return -1;
}
-
+
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
data[2] = (zip_uint8_t)((i >> 16) & 0xff);
data[3] = (zip_uint8_t)((i >> 24) & 0xff);
-
+
return 0;
}
int
-_zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i)
-{
+_zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 8);
-
+
if (data == NULL) {
return -1;
}
-
+
data[0] = (zip_uint8_t)(i & 0xff);
data[1] = (zip_uint8_t)((i >> 8) & 0xff);
data[2] = (zip_uint8_t)((i >> 16) & 0xff);
data[5] = (zip_uint8_t)((i >> 40) & 0xff);
data[6] = (zip_uint8_t)((i >> 48) & 0xff);
data[7] = (zip_uint8_t)((i >> 56) & 0xff);
-
+
return 0;
}
int
-_zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i)
-{
+_zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i) {
zip_uint8_t *data = _zip_buffer_get(buffer, 1);
-
+
if (data == NULL) {
return -1;
}
-
+
data[0] = i;
-
+
return 0;
}
int
-_zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset)
-{
+_zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset) {
if (offset > buffer->size) {
buffer->ok = false;
return -1;
}
-
+
buffer->ok = true;
buffer->offset = offset;
-
+
return 0;
}
+int
+_zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
+ zip_uint64_t offset = buffer->offset + length;
+
+ if (offset < buffer->offset) {
+ buffer->ok = false;
+ return -1;
+ }
+ return _zip_buffer_set_offset(buffer, offset);
+}
+
zip_uint64_t
-_zip_buffer_size(zip_buffer_t *buffer)
-{
+_zip_buffer_size(zip_buffer_t *buffer) {
return buffer->size;
}
projects / platform / upstream / libzip.git / blobdiff