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  1. /* CoreGraphics - CGDataConsumer.h
  2. * Copyright (c) 1999-2008 Apple Inc.
  3. * All rights reserved. */
  5. #ifndef CGDATACONSUMER_H_
  6. #define CGDATACONSUMER_H_
  8. typedef struct CGDataConsumer *CGDataConsumerRef;
  10. #include <CoreGraphics/CGBase.h>
  11. #include <CoreFoundation/CFURL.h>
  13. CF_IMPLICIT_BRIDGING_ENABLED
  15. /* This callback is called to copy `count' bytes from `buffer' to the data
  16. consumer. */
  18. typedef size_t (*CGDataConsumerPutBytesCallback)(void *info,
  19. const void *buffer, size_t count);
  21. /* This callback is called to release the `info' pointer when the data
  22. provider is freed. */
  24. typedef void (*CGDataConsumerReleaseInfoCallback)(void *info);
  26. /* Callbacks for writing data.
  27. `putBytes' copies `count' bytes from `buffer' to the consumer, and
  28. returns the number of bytes copied. It should return 0 if no more data
  29. can be written to the consumer.
  30. `releaseConsumer', if non-NULL, is called when the consumer is freed. */
  32. struct CGDataConsumerCallbacks {
  33. CGDataConsumerPutBytesCallback putBytes;
  34. CGDataConsumerReleaseInfoCallback releaseConsumer;
  35. };
  36. typedef struct CGDataConsumerCallbacks CGDataConsumerCallbacks;
  38. /* Return the CFTypeID for CGDataConsumerRefs. */
  40. CG_EXTERN CFTypeID CGDataConsumerGetTypeID(void)
  41. CG_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_2_0);
  43. /* Create a data consumer using `callbacks' to handle the data. `info' is
  44. passed to each of the callback functions. */
  46. CG_EXTERN CGDataConsumerRef CGDataConsumerCreate(void *info,
  47. const CGDataConsumerCallbacks *callbacks)
  48. CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
  50. /* Create a data consumer which writes data to `url'. */
  52. CG_EXTERN CGDataConsumerRef CGDataConsumerCreateWithURL(CFURLRef url)
  53. CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
  55. /* Create a data consumer which writes to `data'. */
  57. CG_EXTERN CGDataConsumerRef CGDataConsumerCreateWithCFData(CFMutableDataRef
  58. data) CG_AVAILABLE_STARTING(__MAC_10_4, __IPHONE_2_0);
  60. /* Equivalent to `CFRetain(consumer)'. */
  62. CG_EXTERN CGDataConsumerRef CGDataConsumerRetain(CGDataConsumerRef consumer)
  63. CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
  65. /* Equivalent to `CFRelease(consumer)'. */
  67. CG_EXTERN void CGDataConsumerRelease(CGDataConsumerRef consumer)
  68. CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
  70. CF_IMPLICIT_BRIDGING_DISABLED
  72. #endif /* CGDATACONSUMER_H_ */
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